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/* Discard section not used at runtime from object files.
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Copyright (C) 2000-2012, 2014, 2015, 2016, 2017, 2018 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2000.
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This file is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <argp.h>
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#include <assert.h>
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#include <byteswap.h>
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#include <endian.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <gelf.h>
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#include <libelf.h>
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#include <libintl.h>
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#include <locale.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <elf-knowledge.h>
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#include <libebl.h>
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#include "libdwelf.h"
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#include <libeu.h>
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#include <system.h>
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#include <printversion.h>
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typedef uint8_t GElf_Byte;
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/* Name and version of program. */
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ARGP_PROGRAM_VERSION_HOOK_DEF = print_version;
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/* Bug report address. */
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ARGP_PROGRAM_BUG_ADDRESS_DEF = PACKAGE_BUGREPORT;
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/* Values for the parameters which have no short form. */
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#define OPT_REMOVE_COMMENT 0x100
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#define OPT_PERMISSIVE 0x101
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#define OPT_STRIP_SECTIONS 0x102
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#define OPT_RELOC_DEBUG 0x103
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#define OPT_KEEP_SECTION 0x104
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#define OPT_RELOC_DEBUG_ONLY 0x105
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/* Definitions of arguments for argp functions. */
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static const struct argp_option options[] =
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{
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{ NULL, 0, NULL, 0, N_("Output selection:"), 0 },
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{ "output", 'o', "FILE", 0, N_("Place stripped output into FILE"), 0 },
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{ NULL, 'f', "FILE", 0, N_("Extract the removed sections into FILE"), 0 },
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{ NULL, 'F', "FILE", 0, N_("Embed name FILE instead of -f argument"), 0 },
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{ NULL, 0, NULL, 0, N_("Output options:"), 0 },
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{ "strip-all", 's', NULL, OPTION_HIDDEN, NULL, 0 },
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{ "strip-debug", 'g', NULL, 0, N_("Remove all debugging symbols"), 0 },
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{ NULL, 'd', NULL, OPTION_ALIAS, NULL, 0 },
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{ NULL, 'S', NULL, OPTION_ALIAS, NULL, 0 },
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{ "strip-sections", OPT_STRIP_SECTIONS, NULL, 0,
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N_("Remove section headers (not recommended)"), 0 },
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{ "preserve-dates", 'p', NULL, 0,
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N_("Copy modified/access timestamps to the output"), 0 },
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{ "reloc-debug-sections", OPT_RELOC_DEBUG, NULL, 0,
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N_("Resolve all trivial relocations between debug sections if the removed sections are placed in a debug file (only relevant for ET_REL files, operation is not reversable, needs -f)"), 0 },
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{ "reloc-debug-sections-only", OPT_RELOC_DEBUG_ONLY, NULL, 0,
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N_("Similar to --reloc-debug-sections, but resolve all trivial relocations between debug sections in place. No other stripping is performed (operation is not reversable, incompatible with -f, -g, --remove-comment and --remove-section)"), 0 },
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{ "remove-comment", OPT_REMOVE_COMMENT, NULL, 0,
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N_("Remove .comment section"), 0 },
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{ "remove-section", 'R', "SECTION", 0, N_("Remove the named section. SECTION is an extended wildcard pattern. May be given more than once. Only non-allocated sections can be removed."), 0 },
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{ "keep-section", OPT_KEEP_SECTION, "SECTION", 0, N_("Keep the named section. SECTION is an extended wildcard pattern. May be given more than once."), 0 },
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{ "permissive", OPT_PERMISSIVE, NULL, 0,
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N_("Relax a few rules to handle slightly broken ELF files"), 0 },
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{ NULL, 0, NULL, 0, NULL, 0 }
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};
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/* Short description of program. */
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static const char doc[] = N_("Discard symbols from object files.");
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/* Strings for arguments in help texts. */
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static const char args_doc[] = N_("[FILE...]");
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/* Prototype for option handler. */
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static error_t parse_opt (int key, char *arg, struct argp_state *state);
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/* Data structure to communicate with argp functions. */
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static struct argp argp =
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{
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options, parse_opt, args_doc, doc, NULL, NULL, NULL
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};
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/* Print symbols in file named FNAME. */
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static int process_file (const char *fname);
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/* Handle one ELF file. */
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static int handle_elf (int fd, Elf *elf, const char *prefix,
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const char *fname, mode_t mode, struct timespec tvp[2]);
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/* Handle all files contained in the archive. */
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static int handle_ar (int fd, Elf *elf, const char *prefix, const char *fname,
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struct timespec tvp[2]) __attribute__ ((unused));
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static int debug_fd = -1;
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static char *tmp_debug_fname = NULL;
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/* Close debug file descriptor, if opened. And remove temporary debug file. */
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static void cleanup_debug (void);
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#define INTERNAL_ERROR(fname) \
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do { \
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cleanup_debug (); \
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error (EXIT_FAILURE, 0, gettext ("%s: INTERNAL ERROR %d (%s): %s"), \
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fname, __LINE__, PACKAGE_VERSION, elf_errmsg (-1)); \
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} while (0)
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/* Name of the output file. */
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static const char *output_fname;
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/* Name of the debug output file. */
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static const char *debug_fname;
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/* Name to pretend the debug output file has. */
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static const char *debug_fname_embed;
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/* If true output files shall have same date as the input file. */
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static bool preserve_dates;
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/* If true .comment sections will be removed. */
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static bool remove_comment;
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/* If true remove all debug sections. */
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static bool remove_debug;
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/* If true remove all section headers. */
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static bool remove_shdrs;
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/* If true relax some ELF rules for input files. */
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static bool permissive;
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/* If true perform relocations between debug sections. */
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static bool reloc_debug;
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/* If true perform relocations between debug sections only. */
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static bool reloc_debug_only;
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/* Sections the user explicitly wants to keep or remove. */
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struct section_pattern
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{
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char *pattern;
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struct section_pattern *next;
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};
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static struct section_pattern *keep_secs = NULL;
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static struct section_pattern *remove_secs = NULL;
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static void
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add_pattern (struct section_pattern **patterns, const char *pattern)
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{
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struct section_pattern *p = xmalloc (sizeof *p);
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p->pattern = xstrdup (pattern);
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p->next = *patterns;
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*patterns = p;
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}
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static void
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free_sec_patterns (struct section_pattern *patterns)
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{
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struct section_pattern *pattern = patterns;
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while (pattern != NULL)
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{
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struct section_pattern *p = pattern;
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pattern = p->next;
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free (p->pattern);
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free (p);
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}
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}
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static void
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free_patterns (void)
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{
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free_sec_patterns (keep_secs);
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free_sec_patterns (remove_secs);
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}
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static bool
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section_name_matches (struct section_pattern *patterns, const char *name)
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{
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struct section_pattern *pattern = patterns;
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while (pattern != NULL)
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{
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if (fnmatch (pattern->pattern, name, FNM_EXTMATCH) == 0)
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return true;
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pattern = pattern->next;
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}
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return false;
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}
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int
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main (int argc, char *argv[])
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{
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int remaining;
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int result = 0;
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/* We use no threads here which can interfere with handling a stream. */
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__fsetlocking (stdin, FSETLOCKING_BYCALLER);
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__fsetlocking (stdout, FSETLOCKING_BYCALLER);
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__fsetlocking (stderr, FSETLOCKING_BYCALLER);
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/* Set locale. */
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setlocale (LC_ALL, "");
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/* Make sure the message catalog can be found. */
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bindtextdomain (PACKAGE_TARNAME, LOCALEDIR);
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/* Initialize the message catalog. */
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textdomain (PACKAGE_TARNAME);
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/* Parse and process arguments. */
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if (argp_parse (&argp, argc, argv, 0, &remaining, NULL) != 0)
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return EXIT_FAILURE;
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if (reloc_debug && debug_fname == NULL)
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error (EXIT_FAILURE, 0,
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gettext ("--reloc-debug-sections used without -f"));
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if (reloc_debug_only &&
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(debug_fname != NULL || remove_secs != NULL
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|| remove_comment == true || remove_debug == true))
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error (EXIT_FAILURE, 0,
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gettext ("--reloc-debug-sections-only incompatible with -f, -g, --remove-comment and --remove-section"));
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/* Tell the library which version we are expecting. */
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elf_version (EV_CURRENT);
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if (remaining == argc)
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/* The user didn't specify a name so we use a.out. */
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result = process_file ("a.out");
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else
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{
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/* If we have seen the '-o' or '-f' option there must be exactly one
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input file. */
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if ((output_fname != NULL || debug_fname != NULL)
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&& remaining + 1 < argc)
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error (EXIT_FAILURE, 0, gettext ("\
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Only one input file allowed together with '-o' and '-f'"));
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/* Process all the remaining files. */
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do
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result |= process_file (argv[remaining]);
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while (++remaining < argc);
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}
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free_patterns ();
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return result;
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}
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Packit Service |
97d2fb |
/* Handle program arguments. */
|
|
Packit Service |
97d2fb |
static error_t
|
|
Packit Service |
97d2fb |
parse_opt (int key, char *arg, struct argp_state *state)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
switch (key)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
case 'f':
|
|
Packit Service |
97d2fb |
if (debug_fname != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("-f option specified twice"));
|
|
Packit Service |
97d2fb |
return EINVAL;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
debug_fname = arg;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case 'F':
|
|
Packit Service |
97d2fb |
if (debug_fname_embed != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("-F option specified twice"));
|
|
Packit Service |
97d2fb |
return EINVAL;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
debug_fname_embed = arg;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case 'o':
|
|
Packit Service |
97d2fb |
if (output_fname != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("-o option specified twice"));
|
|
Packit Service |
97d2fb |
return EINVAL;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
output_fname = arg;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case 'p':
|
|
Packit Service |
97d2fb |
preserve_dates = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case OPT_RELOC_DEBUG:
|
|
Packit Service |
97d2fb |
reloc_debug = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case OPT_RELOC_DEBUG_ONLY:
|
|
Packit Service |
97d2fb |
reloc_debug_only = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case OPT_REMOVE_COMMENT:
|
|
Packit Service |
97d2fb |
remove_comment = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case 'R':
|
|
Packit Service |
97d2fb |
if (fnmatch (arg, ".comment", FNM_EXTMATCH) == 0)
|
|
Packit Service |
97d2fb |
remove_comment = true;
|
|
Packit Service |
97d2fb |
add_pattern (&remove_secs, arg);
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case OPT_KEEP_SECTION:
|
|
Packit Service |
97d2fb |
add_pattern (&keep_secs, arg);
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case 'g':
|
|
Packit Service |
97d2fb |
case 'd':
|
|
Packit Service |
97d2fb |
case 'S':
|
|
Packit Service |
97d2fb |
remove_debug = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case OPT_STRIP_SECTIONS:
|
|
Packit Service |
97d2fb |
remove_shdrs = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case OPT_PERMISSIVE:
|
|
Packit Service |
97d2fb |
permissive = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case 's': /* Ignored for compatibility. */
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case ARGP_KEY_SUCCESS:
|
|
Packit Service |
97d2fb |
if (remove_comment == true
|
|
Packit Service |
97d2fb |
&& section_name_matches (keep_secs, ".comment"))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
argp_error (state,
|
|
Packit Service |
97d2fb |
gettext ("cannot both keep and remove .comment section"));
|
|
Packit Service |
97d2fb |
return EINVAL;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
default:
|
|
Packit Service |
97d2fb |
return ARGP_ERR_UNKNOWN;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
return 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static const char *
|
|
Packit Service |
97d2fb |
secndx_name (Elf *elf, size_t ndx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
size_t shstrndx;
|
|
Packit Service |
97d2fb |
GElf_Shdr mem;
|
|
Packit Service |
97d2fb |
Elf_Scn *sec = elf_getscn (elf, ndx);
|
|
Packit Service |
97d2fb |
GElf_Shdr *shdr = gelf_getshdr (sec, &mem;;
|
|
Packit Service |
97d2fb |
if (shdr == NULL || elf_getshdrstrndx (elf, &shstrndx) < 0)
|
|
Packit Service |
97d2fb |
return "???";
|
|
Packit Service |
97d2fb |
return elf_strptr (elf, shstrndx, shdr->sh_name) ?: "???";
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the extended section index table data for a symbol table section. */
|
|
Packit Service |
97d2fb |
static Elf_Data *
|
|
Packit Service |
97d2fb |
get_xndxdata (Elf *elf, Elf_Scn *symscn)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf_Data *xndxdata = NULL;
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Shdr *shdr = gelf_getshdr (symscn, &shdr_mem);
|
|
Packit Service |
97d2fb |
if (shdr != NULL && shdr->sh_type == SHT_SYMTAB)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
size_t scnndx = elf_ndxscn (symscn);
|
|
Packit Service |
97d2fb |
Elf_Scn *xndxscn = NULL;
|
|
Packit Service |
97d2fb |
while ((xndxscn = elf_nextscn (elf, xndxscn)) != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Shdr xndxshdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Shdr *xndxshdr = gelf_getshdr (xndxscn, &xndxshdr_mem);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (xndxshdr != NULL
|
|
Packit Service |
97d2fb |
&& xndxshdr->sh_type == SHT_SYMTAB_SHNDX
|
|
Packit Service |
97d2fb |
&& xndxshdr->sh_link == scnndx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
xndxdata = elf_getdata (xndxscn, NULL);
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return xndxdata;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Updates the shdrstrndx for the given Elf by updating the Ehdr and
|
|
Packit Service |
97d2fb |
possibly the section zero extension field. Returns zero on success. */
|
|
Packit Service |
97d2fb |
static int
|
|
Packit Service |
97d2fb |
update_shdrstrndx (Elf *elf, size_t shdrstrndx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Ehdr ehdr;
|
|
Packit Service |
97d2fb |
if (gelf_getehdr (elf, &ehdr) == 0)
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdrstrndx < SHN_LORESERVE)
|
|
Packit Service |
97d2fb |
ehdr.e_shstrndx = shdrstrndx;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
ehdr.e_shstrndx = SHN_XINDEX;
|
|
Packit Service |
97d2fb |
Elf_Scn *scn0 = elf_getscn (elf, 0);
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr0_mem;
|
|
Packit Service |
97d2fb |
GElf_Shdr *shdr0 = gelf_getshdr (scn0, &shdr0_mem);
|
|
Packit Service |
97d2fb |
if (shdr0 == NULL)
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
shdr0->sh_link = shdrstrndx;
|
|
Packit Service |
97d2fb |
if (gelf_update_shdr (scn0, shdr0) == 0)
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_update_ehdr (elf, &ehdr) == 0))
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Remove any relocations between debug sections in ET_REL
|
|
Packit Service |
97d2fb |
for the debug file when requested. These relocations are always
|
|
Packit Service |
97d2fb |
zero based between the unallocated sections. */
|
|
Packit Service |
97d2fb |
static void
|
|
Packit Service |
97d2fb |
remove_debug_relocations (Ebl *ebl, Elf *elf, GElf_Ehdr *ehdr,
|
|
Packit Service |
97d2fb |
const char *fname, size_t shstrndx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf_Scn *scn = NULL;
|
|
Packit Service |
97d2fb |
while ((scn = elf_nextscn (elf, scn)) != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We need the actual section and header from the elf
|
|
Packit Service |
97d2fb |
not just the cached original in shdr_info because we
|
|
Packit Service |
97d2fb |
might want to change the size. */
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
|
|
Packit Service |
97d2fb |
if (shdr->sh_type == SHT_REL || shdr->sh_type == SHT_RELA)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Make sure that this relocation section points to a
|
|
Packit Service |
97d2fb |
section to relocate with contents, that isn't
|
|
Packit Service |
97d2fb |
allocated and that is a debug section. */
|
|
Packit Service |
97d2fb |
Elf_Scn *tscn = elf_getscn (elf, shdr->sh_info);
|
|
Packit Service |
97d2fb |
GElf_Shdr tshdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Shdr *tshdr = gelf_getshdr (tscn, &tshdr_mem);
|
|
Packit Service |
97d2fb |
if (tshdr->sh_type == SHT_NOBITS
|
|
Packit Service |
97d2fb |
|| tshdr->sh_size == 0
|
|
Packit Service |
97d2fb |
|| (tshdr->sh_flags & SHF_ALLOC) != 0)
|
|
Packit Service |
97d2fb |
continue;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
const char *tname = elf_strptr (elf, shstrndx,
|
|
Packit Service |
97d2fb |
tshdr->sh_name);
|
|
Packit Service |
97d2fb |
if (! tname || ! ebl_debugscn_p (ebl, tname))
|
|
Packit Service |
97d2fb |
continue;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* OK, lets relocate all trivial cross debug section
|
|
Packit Service |
97d2fb |
relocations. */
|
|
Packit Service |
97d2fb |
Elf_Data *reldata = elf_getdata (scn, NULL);
|
|
Packit Service |
97d2fb |
if (reldata == NULL || reldata->d_buf == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Make sure we adjust the uncompressed debug data
|
|
Packit Service |
97d2fb |
(and recompress if necessary at the end). */
|
|
Packit Service |
97d2fb |
GElf_Chdr tchdr;
|
|
Packit Service |
97d2fb |
int tcompress_type = 0;
|
|
Packit Service |
97d2fb |
bool is_gnu_compressed = false;
|
|
Packit Service |
97d2fb |
if (strncmp (tname, ".zdebug", strlen ("zdebug")) == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
is_gnu_compressed = true;
|
|
Packit Service |
97d2fb |
if (elf_compress_gnu (tscn, 0, 0) != 1)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (gelf_getchdr (tscn, &tchdr) != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
tcompress_type = tchdr.ch_type;
|
|
Packit Service |
97d2fb |
if (elf_compress (tscn, 0, 0) != 1)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
Elf_Data *tdata = elf_getdata (tscn, NULL);
|
|
Packit Service |
97d2fb |
if (tdata == NULL || tdata->d_buf == NULL
|
|
Packit Service |
97d2fb |
|| tdata->d_type != ELF_T_BYTE)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Pick up the symbol table and shndx table to
|
|
Packit Service |
97d2fb |
resolve relocation symbol indexes. */
|
|
Packit Service |
97d2fb |
Elf64_Word symt = shdr->sh_link;
|
|
Packit Service |
97d2fb |
Elf_Data *symdata, *xndxdata;
|
|
Packit Service |
97d2fb |
Elf_Scn * symscn = elf_getscn (elf, symt);
|
|
Packit Service |
97d2fb |
symdata = elf_getdata (symscn, NULL);
|
|
Packit Service |
97d2fb |
xndxdata = get_xndxdata (elf, symscn);
|
|
Packit Service |
97d2fb |
if (symdata == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Apply one relocation. Returns true when trivial
|
|
Packit Service |
97d2fb |
relocation actually done. */
|
|
Packit Service |
97d2fb |
bool relocate (GElf_Addr offset, const GElf_Sxword addend,
|
|
Packit Service |
97d2fb |
bool is_rela, int rtype, int symndx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* R_*_NONE relocs can always just be removed. */
|
|
Packit Service |
97d2fb |
if (rtype == 0)
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We only do simple absolute relocations. */
|
|
Packit Service |
97d2fb |
int addsub = 0;
|
|
Packit Service |
97d2fb |
Elf_Type type = ebl_reloc_simple_type (ebl, rtype, &addsub);
|
|
Packit Service |
97d2fb |
if (type == ELF_T_NUM)
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* These are the types we can relocate. */
|
|
Packit Service |
97d2fb |
#define TYPES DO_TYPE (BYTE, Byte); DO_TYPE (HALF, Half); \
|
|
Packit Service |
97d2fb |
DO_TYPE (WORD, Word); DO_TYPE (SWORD, Sword); \
|
|
Packit Service |
97d2fb |
DO_TYPE (XWORD, Xword); DO_TYPE (SXWORD, Sxword)
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* And only for relocations against other debug sections. */
|
|
Packit Service |
97d2fb |
GElf_Sym sym_mem;
|
|
Packit Service |
97d2fb |
Elf32_Word xndx;
|
|
Packit Service |
97d2fb |
GElf_Sym *sym = gelf_getsymshndx (symdata, xndxdata,
|
|
Packit Service |
97d2fb |
symndx, &sym_mem,
|
|
Packit Service |
97d2fb |
&xndx);
|
|
Packit Service |
97d2fb |
Elf32_Word sec = (sym->st_shndx == SHN_XINDEX
|
|
Packit Service |
97d2fb |
? xndx : sym->st_shndx);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (ebl_debugscn_p (ebl, secndx_name (elf, sec)))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
size_t size;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
#define DO_TYPE(NAME, Name) GElf_##Name Name;
|
|
Packit Service |
97d2fb |
union { TYPES; } tmpbuf;
|
|
Packit Service |
97d2fb |
#undef DO_TYPE
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
switch (type)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
#define DO_TYPE(NAME, Name) \
|
|
Packit Service |
97d2fb |
case ELF_T_##NAME: \
|
|
Packit Service |
97d2fb |
size = sizeof (GElf_##Name); \
|
|
Packit Service |
97d2fb |
tmpbuf.Name = 0; \
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
TYPES;
|
|
Packit Service |
97d2fb |
#undef DO_TYPE
|
|
Packit Service |
97d2fb |
default:
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (offset > tdata->d_size
|
|
Packit Service |
97d2fb |
|| tdata->d_size - offset < size)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0, gettext ("bad relocation"));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* When the symbol value is zero then for SHT_REL
|
|
Packit Service |
97d2fb |
sections this is all that needs to be checked.
|
|
Packit Service |
97d2fb |
The addend is contained in the original data at
|
|
Packit Service |
97d2fb |
the offset already. So if the (section) symbol
|
|
Packit Service |
97d2fb |
address is zero and the given addend is zero
|
|
Packit Service |
97d2fb |
just remove the relocation, it isn't needed
|
|
Packit Service |
97d2fb |
anymore. */
|
|
Packit Service |
97d2fb |
if (addend == 0 && sym->st_value == 0)
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
Elf_Data tmpdata =
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
.d_type = type,
|
|
Packit Service |
97d2fb |
.d_buf = &tmpbuf,
|
|
Packit Service |
97d2fb |
.d_size = size,
|
|
Packit Service |
97d2fb |
.d_version = EV_CURRENT,
|
|
Packit Service |
97d2fb |
};
|
|
Packit Service |
97d2fb |
Elf_Data rdata =
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
.d_type = type,
|
|
Packit Service |
97d2fb |
.d_buf = tdata->d_buf + offset,
|
|
Packit Service |
97d2fb |
.d_size = size,
|
|
Packit Service |
97d2fb |
.d_version = EV_CURRENT,
|
|
Packit Service |
97d2fb |
};
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
GElf_Addr value = sym->st_value;
|
|
Packit Service |
97d2fb |
if (is_rela)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* For SHT_RELA sections we just take the
|
|
Packit Service |
97d2fb |
given addend and add it to the value. */
|
|
Packit Service |
97d2fb |
value += addend;
|
|
Packit Service |
97d2fb |
/* For ADD/SUB relocations we need to fetch the
|
|
Packit Service |
97d2fb |
current section contents. */
|
|
Packit Service |
97d2fb |
if (addsub != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf_Data *d = gelf_xlatetom (elf, &tmpdata,
|
|
Packit Service |
97d2fb |
&rdata,
|
|
Packit Service |
97d2fb |
ehdr->e_ident[EI_DATA]);
|
|
Packit Service |
97d2fb |
if (d == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
assert (d == &tmpdata);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* For SHT_REL sections we have to peek at
|
|
Packit Service |
97d2fb |
what is already in the section at the given
|
|
Packit Service |
97d2fb |
offset to get the addend. */
|
|
Packit Service |
97d2fb |
Elf_Data *d = gelf_xlatetom (elf, &tmpdata,
|
|
Packit Service |
97d2fb |
&rdata,
|
|
Packit Service |
97d2fb |
ehdr->e_ident[EI_DATA]);
|
|
Packit Service |
97d2fb |
if (d == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
assert (d == &tmpdata);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
switch (type)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
#define DO_TYPE(NAME, Name) \
|
|
Packit Service |
97d2fb |
case ELF_T_##NAME: \
|
|
Packit Service |
97d2fb |
if (addsub < 0) \
|
|
Packit Service |
97d2fb |
tmpbuf.Name -= (GElf_##Name) value; \
|
|
Packit Service |
97d2fb |
else \
|
|
Packit Service |
97d2fb |
tmpbuf.Name += (GElf_##Name) value; \
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
TYPES;
|
|
Packit Service |
97d2fb |
#undef DO_TYPE
|
|
Packit Service |
97d2fb |
default:
|
|
Packit Service |
97d2fb |
abort ();
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Now finally put in the new value. */
|
|
Packit Service |
97d2fb |
Elf_Data *s = gelf_xlatetof (elf, &rdata,
|
|
Packit Service |
97d2fb |
&tmpdata,
|
|
Packit Service |
97d2fb |
ehdr->e_ident[EI_DATA]);
|
|
Packit Service |
97d2fb |
if (s == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
assert (s == &rdata);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr->sh_entsize == 0)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t nrels = shdr->sh_size / shdr->sh_entsize;
|
|
Packit Service |
97d2fb |
size_t next = 0;
|
|
Packit Service |
97d2fb |
if (shdr->sh_type == SHT_REL)
|
|
Packit Service |
97d2fb |
for (size_t relidx = 0; relidx < nrels; ++relidx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Rel rel_mem;
|
|
Packit Service |
97d2fb |
GElf_Rel *r = gelf_getrel (reldata, relidx, &rel_mem);
|
|
Packit Service |
97d2fb |
if (! relocate (r->r_offset, 0, false,
|
|
Packit Service |
97d2fb |
GELF_R_TYPE (r->r_info),
|
|
Packit Service |
97d2fb |
GELF_R_SYM (r->r_info)))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (relidx != next)
|
|
Packit Service |
97d2fb |
gelf_update_rel (reldata, next, r);
|
|
Packit Service |
97d2fb |
++next;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
for (size_t relidx = 0; relidx < nrels; ++relidx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Rela rela_mem;
|
|
Packit Service |
97d2fb |
GElf_Rela *r = gelf_getrela (reldata, relidx, &rela_mem);
|
|
Packit Service |
97d2fb |
if (! relocate (r->r_offset, r->r_addend, true,
|
|
Packit Service |
97d2fb |
GELF_R_TYPE (r->r_info),
|
|
Packit Service |
97d2fb |
GELF_R_SYM (r->r_info)))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (relidx != next)
|
|
Packit Service |
97d2fb |
gelf_update_rela (reldata, next, r);
|
|
Packit Service |
97d2fb |
++next;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
nrels = next;
|
|
Packit Service |
97d2fb |
shdr->sh_size = reldata->d_size = nrels * shdr->sh_entsize;
|
|
Packit Service |
97d2fb |
gelf_update_shdr (scn, shdr);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (is_gnu_compressed)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (elf_compress_gnu (tscn, 1, ELF_CHF_FORCE) != 1)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else if (tcompress_type != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (elf_compress (tscn, tcompress_type, ELF_CHF_FORCE) != 1)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static int
|
|
Packit Service |
97d2fb |
process_file (const char *fname)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* If we have to preserve the modify and access timestamps get them
|
|
Packit Service |
97d2fb |
now. We cannot use fstat() after opening the file since the open
|
|
Packit Service |
97d2fb |
would change the access time. */
|
|
Packit Service |
97d2fb |
struct stat pre_st;
|
|
Packit Service |
97d2fb |
struct timespec tv[2];
|
|
Packit Service |
97d2fb |
again:
|
|
Packit Service |
97d2fb |
if (preserve_dates)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (stat (fname, &pre_st) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("cannot stat input file '%s'"), fname);
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If we have to preserve the timestamp, we need it in the
|
|
Packit Service |
97d2fb |
format utimes() understands. */
|
|
Packit Service |
97d2fb |
tv[0] = pre_st.st_atim;
|
|
Packit Service |
97d2fb |
tv[1] = pre_st.st_mtim;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Open the file. */
|
|
Packit Service |
97d2fb |
int fd = open (fname, output_fname == NULL ? O_RDWR : O_RDONLY);
|
|
Packit Service |
97d2fb |
if (fd == -1)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("while opening '%s'"), fname);
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We always use fstat() even if we called stat() before. This is
|
|
Packit Service |
97d2fb |
done to make sure the information returned by stat() is for the
|
|
Packit Service |
97d2fb |
same file. */
|
|
Packit Service |
97d2fb |
struct stat st;
|
|
Packit Service |
97d2fb |
if (fstat (fd, &st) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("cannot stat input file '%s'"), fname);
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
/* Paranoid mode on. */
|
|
Packit Service |
97d2fb |
if (preserve_dates
|
|
Packit Service |
97d2fb |
&& (st.st_ino != pre_st.st_ino || st.st_dev != pre_st.st_dev))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We detected a race. Try again. */
|
|
Packit Service |
97d2fb |
close (fd);
|
|
Packit Service |
97d2fb |
goto again;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Now get the ELF descriptor. */
|
|
Packit Service |
97d2fb |
Elf *elf = elf_begin (fd, output_fname == NULL ? ELF_C_RDWR : ELF_C_READ,
|
|
Packit Service |
97d2fb |
NULL);
|
|
Packit Service |
97d2fb |
int result;
|
|
Packit Service |
97d2fb |
switch (elf_kind (elf))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
case ELF_K_ELF:
|
|
Packit Service |
97d2fb |
result = handle_elf (fd, elf, NULL, fname, st.st_mode & ACCESSPERMS,
|
|
Packit Service |
97d2fb |
preserve_dates ? tv : NULL);
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case ELF_K_AR:
|
|
Packit Service |
97d2fb |
/* It is not possible to strip the content of an archive direct
|
|
Packit Service |
97d2fb |
the output to a specific file. */
|
|
Packit Service |
97d2fb |
if (unlikely (output_fname != NULL || debug_fname != NULL))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("%s: cannot use -o or -f when stripping archive"),
|
|
Packit Service |
97d2fb |
fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* We would like to support ar archives, but currently it just
|
|
Packit Service |
97d2fb |
doesn't work at all since we call elf_clone on the members
|
|
Packit Service |
97d2fb |
which doesn't really support ar members.
|
|
Packit Service |
97d2fb |
result = handle_ar (fd, elf, NULL, fname,
|
|
Packit Service |
97d2fb |
preserve_dates ? tv : NULL);
|
|
Packit Service |
97d2fb |
*/
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("%s: no support for stripping archive"),
|
|
Packit Service |
97d2fb |
fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
default:
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("%s: File format not recognized"), fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (elf_end (elf) != 0))
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
close (fd);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return result;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Processing for --reloc-debug-sections-only. */
|
|
Packit Service |
97d2fb |
static int
|
|
Packit Service |
97d2fb |
handle_debug_relocs (Elf *elf, Ebl *ebl, Elf *new_elf,
|
|
Packit Service |
97d2fb |
GElf_Ehdr *ehdr, const char *fname, size_t shstrndx,
|
|
Packit Service |
97d2fb |
GElf_Off *last_offset, GElf_Xword *last_size)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Copy over the ELF header. */
|
|
Packit Service |
97d2fb |
if (gelf_update_ehdr (new_elf, ehdr) == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, "couldn't update new ehdr: %s", elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Copy over sections and record end of allocated sections. */
|
|
Packit Service |
97d2fb |
GElf_Off lastoffset = 0;
|
|
Packit Service |
97d2fb |
Elf_Scn *scn = NULL;
|
|
Packit Service |
97d2fb |
while ((scn = elf_nextscn (elf, scn)) != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Get the header. */
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr;
|
|
Packit Service |
97d2fb |
if (gelf_getshdr (scn, &shdr) == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, "couldn't get shdr: %s", elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create new section. */
|
|
Packit Service |
97d2fb |
Elf_Scn *new_scn = elf_newscn (new_elf);
|
|
Packit Service |
97d2fb |
if (new_scn == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, "couldn't create new section: %s", elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (gelf_update_shdr (new_scn, &shdr) == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, "couldn't update shdr: %s", elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Copy over section data. */
|
|
Packit Service |
97d2fb |
Elf_Data *data = NULL;
|
|
Packit Service |
97d2fb |
while ((data = elf_getdata (scn, data)) != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf_Data *new_data = elf_newdata (new_scn);
|
|
Packit Service |
97d2fb |
if (new_data == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, "couldn't create new section data: %s",
|
|
Packit Service |
97d2fb |
elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
*new_data = *data;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Record last offset of allocated section. */
|
|
Packit Service |
97d2fb |
if ((shdr.sh_flags & SHF_ALLOC) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Off filesz = (shdr.sh_type != SHT_NOBITS
|
|
Packit Service |
97d2fb |
? shdr.sh_size : 0);
|
|
Packit Service |
97d2fb |
if (lastoffset < shdr.sh_offset + filesz)
|
|
Packit Service |
97d2fb |
lastoffset = shdr.sh_offset + filesz;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Make sure section header name table is setup correctly, we'll
|
|
Packit Service |
97d2fb |
need it to determine whether to relocate sections. */
|
|
Packit Service |
97d2fb |
if (update_shdrstrndx (new_elf, shstrndx) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, "error updating shdrstrndx: %s", elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Adjust the relocation sections. */
|
|
Packit Service |
97d2fb |
remove_debug_relocations (ebl, new_elf, ehdr, fname, shstrndx);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Adjust the offsets of the non-allocated sections, so they come after
|
|
Packit Service |
97d2fb |
the allocated sections. */
|
|
Packit Service |
97d2fb |
scn = NULL;
|
|
Packit Service |
97d2fb |
while ((scn = elf_nextscn (new_elf, scn)) != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Get the header. */
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr;
|
|
Packit Service |
97d2fb |
if (gelf_getshdr (scn, &shdr) == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, "couldn't get shdr: %s", elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Adjust non-allocated section offsets to be after any allocated. */
|
|
Packit Service |
97d2fb |
if ((shdr.sh_flags & SHF_ALLOC) == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr.sh_offset = ((lastoffset + shdr.sh_addralign - 1)
|
|
Packit Service |
97d2fb |
& ~((GElf_Off) (shdr.sh_addralign - 1)));
|
|
Packit Service |
97d2fb |
if (gelf_update_shdr (scn, &shdr) == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, "couldn't update shdr: %s", elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
GElf_Off filesz = (shdr.sh_type != SHT_NOBITS
|
|
Packit Service |
97d2fb |
? shdr.sh_size : 0);
|
|
Packit Service |
97d2fb |
lastoffset = shdr.sh_offset + filesz;
|
|
Packit Service |
97d2fb |
*last_offset = shdr.sh_offset;
|
|
Packit Service |
97d2fb |
*last_size = filesz;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Maximum size of array allocated on stack. */
|
|
Packit Service |
97d2fb |
#define MAX_STACK_ALLOC (400 * 1024)
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static int
|
|
Packit Service |
97d2fb |
handle_elf (int fd, Elf *elf, const char *prefix, const char *fname,
|
|
Packit Service |
97d2fb |
mode_t mode, struct timespec tvp[2])
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
size_t prefix_len = prefix == NULL ? 0 : strlen (prefix);
|
|
Packit Service |
97d2fb |
size_t fname_len = strlen (fname) + 1;
|
|
Packit Service |
97d2fb |
char *fullname = alloca (prefix_len + 1 + fname_len);
|
|
Packit Service |
97d2fb |
char *cp = fullname;
|
|
Packit Service |
97d2fb |
Elf *debugelf = NULL;
|
|
Packit Service |
97d2fb |
tmp_debug_fname = NULL;
|
|
Packit Service |
97d2fb |
int result = 0;
|
|
Packit Service |
97d2fb |
size_t shdridx = 0;
|
|
Packit Service |
97d2fb |
GElf_Off lastsec_offset = 0;
|
|
Packit Service |
97d2fb |
Elf64_Xword lastsec_size = 0;
|
|
Packit Service |
97d2fb |
size_t shstrndx;
|
|
Packit Service |
97d2fb |
struct shdr_info
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf_Scn *scn;
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr;
|
|
Packit Service |
97d2fb |
Elf_Data *data;
|
|
Packit Service |
97d2fb |
Elf_Data *debug_data;
|
|
Packit Service |
97d2fb |
const char *name;
|
|
Packit Service |
97d2fb |
Elf32_Word idx; /* Index in new file. */
|
|
Packit Service |
97d2fb |
Elf32_Word old_sh_link; /* Original value of shdr.sh_link. */
|
|
Packit Service |
97d2fb |
Elf32_Word symtab_idx;
|
|
Packit Service |
97d2fb |
Elf32_Word version_idx;
|
|
Packit Service |
97d2fb |
Elf32_Word group_idx;
|
|
Packit Service |
97d2fb |
Elf32_Word group_cnt;
|
|
Packit Service |
97d2fb |
Elf_Scn *newscn;
|
|
Packit Service |
97d2fb |
Dwelf_Strent *se;
|
|
Packit Service |
97d2fb |
Elf32_Word *newsymidx;
|
|
Packit Service |
97d2fb |
} *shdr_info = NULL;
|
|
Packit Service |
97d2fb |
Elf_Scn *scn;
|
|
Packit Service |
97d2fb |
size_t cnt;
|
|
Packit Service |
97d2fb |
size_t idx;
|
|
Packit Service |
97d2fb |
bool changes;
|
|
Packit Service |
97d2fb |
GElf_Ehdr newehdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Ehdr *newehdr;
|
|
Packit Service |
97d2fb |
GElf_Ehdr debugehdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Ehdr *debugehdr;
|
|
Packit Service |
97d2fb |
Dwelf_Strtab *shst = NULL;
|
|
Packit Service |
97d2fb |
Elf_Data debuglink_crc_data;
|
|
Packit Service |
97d2fb |
bool any_symtab_changes = false;
|
|
Packit Service |
97d2fb |
Elf_Data *shstrtab_data = NULL;
|
|
Packit Service |
97d2fb |
void *debuglink_buf = NULL;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create the full name of the file. */
|
|
Packit Service |
97d2fb |
if (prefix != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cp = mempcpy (cp, prefix, prefix_len);
|
|
Packit Service |
97d2fb |
*cp++ = ':';
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
memcpy (cp, fname, fname_len);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If we are not replacing the input file open a new file here. */
|
|
Packit Service |
97d2fb |
if (output_fname != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
fd = open (output_fname, O_RDWR | O_CREAT, mode);
|
|
Packit Service |
97d2fb |
if (unlikely (fd == -1))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("cannot open '%s'"), output_fname);
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
debug_fd = -1;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the EBL handling. Removing all debugging symbols with the -g
|
|
Packit Service |
97d2fb |
option or resolving all relocations between debug sections with
|
|
Packit Service |
97d2fb |
the --reloc-debug-sections option are currently the only reasons
|
|
Packit Service |
97d2fb |
we need EBL so don't open the backend unless necessary. */
|
|
Packit Service |
97d2fb |
Ebl *ebl = NULL;
|
|
Packit Service |
97d2fb |
if (remove_debug || reloc_debug || reloc_debug_only)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
ebl = ebl_openbackend (elf);
|
|
Packit Service |
97d2fb |
if (ebl == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("cannot open EBL backend"));
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Open the additional file the debug information will be stored in. */
|
|
Packit Service |
97d2fb |
if (debug_fname != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Create a temporary file name. We do not want to overwrite
|
|
Packit Service |
97d2fb |
the debug file if the file would not contain any
|
|
Packit Service |
97d2fb |
information. */
|
|
Packit Service |
97d2fb |
size_t debug_fname_len = strlen (debug_fname);
|
|
Packit Service |
97d2fb |
tmp_debug_fname = (char *) xmalloc (debug_fname_len + sizeof (".XXXXXX"));
|
|
Packit Service |
97d2fb |
strcpy (mempcpy (tmp_debug_fname, debug_fname, debug_fname_len),
|
|
Packit Service |
97d2fb |
".XXXXXX");
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
debug_fd = mkstemp (tmp_debug_fname);
|
|
Packit Service |
97d2fb |
if (unlikely (debug_fd == -1))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("cannot open '%s'"), debug_fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the information from the old file. */
|
|
Packit Service |
97d2fb |
GElf_Ehdr ehdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
|
|
Packit Service |
97d2fb |
if (ehdr == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the section header string table index. */
|
|
Packit Service |
97d2fb |
if (unlikely (elf_getshdrstrndx (elf, &shstrndx) < 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0,
|
|
Packit Service |
97d2fb |
gettext ("cannot get section header string table index"));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the number of phdrs in the old file. */
|
|
Packit Service |
97d2fb |
size_t phnum;
|
|
Packit Service |
97d2fb |
if (elf_getphdrnum (elf, &phnum) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0, gettext ("cannot get number of phdrs"));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We now create a new ELF descriptor for the same file. We
|
|
Packit Service |
97d2fb |
construct it almost exactly in the same way with some information
|
|
Packit Service |
97d2fb |
dropped. */
|
|
Packit Service |
97d2fb |
Elf *newelf;
|
|
Packit Service |
97d2fb |
if (output_fname != NULL)
|
|
Packit Service |
97d2fb |
newelf = elf_begin (fd, ELF_C_WRITE_MMAP, NULL);
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
newelf = elf_clone (elf, ELF_C_EMPTY);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_newehdr (newelf, gelf_getclass (elf)) == 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("cannot create new ehdr for file '%s': %s"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
goto fail;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Copy over the old program header if needed. */
|
|
Packit Service |
97d2fb |
if (phnum > 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_newphdr (newelf, phnum) == 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("cannot create new phdr for file '%s': %s"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
goto fail;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
for (cnt = 0; cnt < phnum; ++cnt)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Phdr phdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Phdr *phdr = gelf_getphdr (elf, cnt, &phdr_mem);
|
|
Packit Service |
97d2fb |
if (phdr == NULL
|
|
Packit Service |
97d2fb |
|| unlikely (gelf_update_phdr (newelf, cnt, phdr) == 0))
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (reloc_debug_only)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (handle_debug_relocs (elf, ebl, newelf, ehdr, fname, shstrndx,
|
|
Packit Service |
97d2fb |
&lastsec_offset, &lastsec_size) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
idx = shstrndx;
|
|
Packit Service |
97d2fb |
goto done; /* Skip all actual stripping operations. */
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (debug_fname != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Also create an ELF descriptor for the debug file */
|
|
Packit Service |
97d2fb |
debugelf = elf_begin (debug_fd, ELF_C_WRITE, NULL);
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_newehdr (debugelf, gelf_getclass (elf)) == 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("cannot create new ehdr for file '%s': %s"),
|
|
Packit Service |
97d2fb |
debug_fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Copy over the old program header if needed. */
|
|
Packit Service |
97d2fb |
if (phnum > 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_newphdr (debugelf, phnum) == 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("cannot create new phdr for file '%s': %s"),
|
|
Packit Service |
97d2fb |
debug_fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
for (cnt = 0; cnt < phnum; ++cnt)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Phdr phdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Phdr *phdr = gelf_getphdr (elf, cnt, &phdr_mem);
|
|
Packit Service |
97d2fb |
if (phdr == NULL
|
|
Packit Service |
97d2fb |
|| unlikely (gelf_update_phdr (debugelf, cnt, phdr) == 0))
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Number of sections. */
|
|
Packit Service |
97d2fb |
size_t shnum;
|
|
Packit Service |
97d2fb |
if (unlikely (elf_getshdrnum (elf, &shnum) < 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("cannot determine number of sections: %s"),
|
|
Packit Service |
97d2fb |
elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shstrndx >= shnum)
|
|
Packit Service |
97d2fb |
goto illformed;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
#define elf_assert(test) do { if (!(test)) goto illformed; } while (0)
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Storage for section information. We leave room for two more
|
|
Packit Service |
97d2fb |
entries since we unconditionally create a section header string
|
|
Packit Service |
97d2fb |
table. Maybe some weird tool created an ELF file without one.
|
|
Packit Service |
97d2fb |
The other one is used for the debug link section. */
|
|
Packit Service |
97d2fb |
if ((shnum + 2) * sizeof (struct shdr_info) > MAX_STACK_ALLOC)
|
|
Packit Service |
97d2fb |
shdr_info = (struct shdr_info *) xcalloc (shnum + 2,
|
|
Packit Service |
97d2fb |
sizeof (struct shdr_info));
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr_info = (struct shdr_info *) alloca ((shnum + 2)
|
|
Packit Service |
97d2fb |
* sizeof (struct shdr_info));
|
|
Packit Service |
97d2fb |
memset (shdr_info, '\0', (shnum + 2) * sizeof (struct shdr_info));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Track whether allocated sections all come before non-allocated ones. */
|
|
Packit Service |
97d2fb |
bool seen_allocated = false;
|
|
Packit Service |
97d2fb |
bool seen_unallocated = false;
|
|
Packit Service |
97d2fb |
bool mixed_allocated_unallocated = false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Prepare section information data structure. */
|
|
Packit Service |
97d2fb |
scn = NULL;
|
|
Packit Service |
97d2fb |
cnt = 1;
|
|
Packit Service |
97d2fb |
while ((scn = elf_nextscn (elf, scn)) != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* This should always be true (i.e., there should not be any
|
|
Packit Service |
97d2fb |
holes in the numbering). */
|
|
Packit Service |
97d2fb |
elf_assert (elf_ndxscn (scn) == cnt);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
shdr_info[cnt].scn = scn;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the header. */
|
|
Packit Service |
97d2fb |
if (gelf_getshdr (scn, &shdr_info[cnt].shdr) == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Normally (in non-ET_REL files) we see all allocated sections first,
|
|
Packit Service |
97d2fb |
then all non-allocated. */
|
|
Packit Service |
97d2fb |
if ((shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) == 0)
|
|
Packit Service |
97d2fb |
seen_unallocated = true;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (seen_unallocated && seen_allocated)
|
|
Packit Service |
97d2fb |
mixed_allocated_unallocated = true;
|
|
Packit Service |
97d2fb |
seen_allocated = true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the name of the section. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].name = elf_strptr (elf, shstrndx,
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_name);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].name == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
illformed:
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("illformed file '%s'"), fname);
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Sanity check the user. */
|
|
Packit Service |
97d2fb |
if (section_name_matches (remove_secs, shdr_info[cnt].name))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if ((shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0,
|
|
Packit Service |
97d2fb |
gettext ("Cannot remove allocated section '%s'"),
|
|
Packit Service |
97d2fb |
shdr_info[cnt].name);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (section_name_matches (keep_secs, shdr_info[cnt].name))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0,
|
|
Packit Service |
97d2fb |
gettext ("Cannot both keep and remove section '%s'"),
|
|
Packit Service |
97d2fb |
shdr_info[cnt].name);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Mark them as present but not yet investigated. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx = 1;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Remember the shdr.sh_link value. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].old_sh_link = shdr_info[cnt].shdr.sh_link;
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].old_sh_link >= shnum)
|
|
Packit Service |
97d2fb |
goto illformed;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Sections in files other than relocatable object files which
|
|
Packit Service |
97d2fb |
not loaded can be freely moved by us. In theory we can also
|
|
Packit Service |
97d2fb |
freely move around allocated nobits sections. But we don't
|
|
Packit Service |
97d2fb |
to keep the layout of all allocated sections as similar as
|
|
Packit Service |
97d2fb |
possible to the original file. In relocatable object files
|
|
Packit Service |
97d2fb |
everything can be moved. */
|
|
Packit Service |
97d2fb |
if (phnum == 0
|
|
Packit Service |
97d2fb |
|| (shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) == 0)
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_offset = 0;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If this is an extended section index table store an
|
|
Packit Service |
97d2fb |
appropriate reference. */
|
|
Packit Service |
97d2fb |
if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB_SHNDX))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx == 0);
|
|
Packit Service |
97d2fb |
shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx = cnt;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_GROUP))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Cross-reference the sections contained in the section
|
|
Packit Service |
97d2fb |
group. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].data = elf_getdata (shdr_info[cnt].scn, NULL);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].data == NULL
|
|
Packit Service |
97d2fb |
|| shdr_info[cnt].data->d_size < sizeof (Elf32_Word))
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* XXX Fix for unaligned access. */
|
|
Packit Service |
97d2fb |
Elf32_Word *grpref = (Elf32_Word *) shdr_info[cnt].data->d_buf;
|
|
Packit Service |
97d2fb |
size_t inner;
|
|
Packit Service |
97d2fb |
for (inner = 1;
|
|
Packit Service |
97d2fb |
inner < shdr_info[cnt].data->d_size / sizeof (Elf32_Word);
|
|
Packit Service |
97d2fb |
++inner)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (grpref[inner] < shnum)
|
|
Packit Service |
97d2fb |
shdr_info[grpref[inner]].group_idx = cnt;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
goto illformed;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (inner == 1 || (inner == 2 && (grpref[0] & GRP_COMDAT) == 0))
|
|
Packit Service |
97d2fb |
/* If the section group contains only one element and this
|
|
Packit Service |
97d2fb |
is n COMDAT section we can drop it right away. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx = 0;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
shdr_info[cnt].group_cnt = inner - 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_GNU_versym))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[shdr_info[cnt].shdr.sh_link].version_idx == 0);
|
|
Packit Service |
97d2fb |
shdr_info[shdr_info[cnt].shdr.sh_link].version_idx = cnt;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If this section is part of a group make sure it is not
|
|
Packit Service |
97d2fb |
discarded right away. */
|
|
Packit Service |
97d2fb |
if ((shdr_info[cnt].shdr.sh_flags & SHF_GROUP) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[cnt].group_idx != 0);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr_info[shdr_info[cnt].group_idx].idx == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* The section group section might be removed.
|
|
Packit Service |
97d2fb |
Don't remove the SHF_GROUP flag. The section is
|
|
Packit Service |
97d2fb |
either also removed, in which case the flag doesn't matter.
|
|
Packit Service |
97d2fb |
Or it moves with the group into the debug file, then
|
|
Packit Service |
97d2fb |
it will be reconnected with the new group and should
|
|
Packit Service |
97d2fb |
still have the flag set. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].group_idx = 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Increment the counter. */
|
|
Packit Service |
97d2fb |
++cnt;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Now determine which sections can go away. The general rule is that
|
|
Packit Service |
97d2fb |
all sections which are not used at runtime are stripped out. But
|
|
Packit Service |
97d2fb |
there are a few exceptions:
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
- special sections named ".comment" and ".note" are kept
|
|
Packit Service |
97d2fb |
- OS or architecture specific sections are kept since we might not
|
|
Packit Service |
97d2fb |
know how to handle them
|
|
Packit Service |
97d2fb |
- if a section is referred to from a section which is not removed
|
|
Packit Service |
97d2fb |
in the sh_link or sh_info element it cannot be removed either
|
|
Packit Service |
97d2fb |
- the user might have explicitly said to remove or keep a section
|
|
Packit Service |
97d2fb |
*/
|
|
Packit Service |
97d2fb |
for (cnt = 1; cnt < shnum; ++cnt)
|
|
Packit Service |
97d2fb |
/* Check whether the section can be removed. Since we will create
|
|
Packit Service |
97d2fb |
a new .shstrtab assume it will be removed too. */
|
|
Packit Service |
97d2fb |
if (remove_shdrs ? !(shdr_info[cnt].shdr.sh_flags & SHF_ALLOC)
|
|
Packit Service |
97d2fb |
: (ebl_section_strip_p (ebl, &shdr_info[cnt].shdr,
|
|
Packit Service |
97d2fb |
shdr_info[cnt].name, remove_comment,
|
|
Packit Service |
97d2fb |
remove_debug)
|
|
Packit Service |
97d2fb |
|| cnt == shstrndx
|
|
Packit Service |
97d2fb |
|| section_name_matches (remove_secs, shdr_info[cnt].name)))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* The user might want to explicitly keep this one. */
|
|
Packit Service |
97d2fb |
if (section_name_matches (keep_secs, shdr_info[cnt].name))
|
|
Packit Service |
97d2fb |
continue;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* For now assume this section will be removed. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx = 0;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
idx = shdr_info[cnt].group_idx;
|
|
Packit Service |
97d2fb |
while (idx != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* The section group data is already loaded. */
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[idx].data != NULL
|
|
Packit Service |
97d2fb |
&& shdr_info[idx].data->d_buf != NULL
|
|
Packit Service |
97d2fb |
&& shdr_info[idx].data->d_size >= sizeof (Elf32_Word));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If the references section group is a normal section
|
|
Packit Service |
97d2fb |
group and has one element remaining, or if it is an
|
|
Packit Service |
97d2fb |
empty COMDAT section group it is removed. */
|
|
Packit Service |
97d2fb |
bool is_comdat = (((Elf32_Word *) shdr_info[idx].data->d_buf)[0]
|
|
Packit Service |
97d2fb |
& GRP_COMDAT) != 0;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
--shdr_info[idx].group_cnt;
|
|
Packit Service |
97d2fb |
if ((!is_comdat && shdr_info[idx].group_cnt == 1)
|
|
Packit Service |
97d2fb |
|| (is_comdat && shdr_info[idx].group_cnt == 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr_info[idx].idx = 0;
|
|
Packit Service |
97d2fb |
/* Continue recursively. */
|
|
Packit Service |
97d2fb |
idx = shdr_info[idx].group_idx;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Mark the SHT_NULL section as handled. */
|
|
Packit Service |
97d2fb |
shdr_info[0].idx = 2;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Handle exceptions: section groups and cross-references. We might
|
|
Packit Service |
97d2fb |
have to repeat this a few times since the resetting of the flag
|
|
Packit Service |
97d2fb |
might propagate. */
|
|
Packit Service |
97d2fb |
do
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
changes = false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
for (cnt = 1; cnt < shnum; ++cnt)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].idx == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* If a relocation section is marked as being removed make
|
|
Packit Service |
97d2fb |
sure the section it is relocating is removed, too. */
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_type == SHT_REL
|
|
Packit Service |
97d2fb |
|| shdr_info[cnt].shdr.sh_type == SHT_RELA)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_info >= shnum)
|
|
Packit Service |
97d2fb |
goto illformed;
|
|
Packit Service |
97d2fb |
else if (shdr_info[shdr_info[cnt].shdr.sh_info].idx != 0)
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If a group section is marked as being removed make
|
|
Packit Service |
97d2fb |
sure all the sections it contains are being removed, too. */
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_type == SHT_GROUP)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf32_Word *grpref;
|
|
Packit Service |
97d2fb |
grpref = (Elf32_Word *) shdr_info[cnt].data->d_buf;
|
|
Packit Service |
97d2fb |
for (size_t in = 1;
|
|
Packit Service |
97d2fb |
in < shdr_info[cnt].data->d_size / sizeof (Elf32_Word);
|
|
Packit Service |
97d2fb |
++in)
|
|
Packit Service |
97d2fb |
if (grpref[in] < shnum)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (shdr_info[grpref[in]].idx != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx = 1;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
goto illformed;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].idx == 1)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* The content of symbol tables we don't remove must not
|
|
Packit Service |
97d2fb |
reference any section which we do remove. Otherwise
|
|
Packit Service |
97d2fb |
we cannot remove the section. */
|
|
Packit Service |
97d2fb |
if (debug_fname != NULL
|
|
Packit Service |
97d2fb |
&& shdr_info[cnt].debug_data == NULL
|
|
Packit Service |
97d2fb |
&& (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM
|
|
Packit Service |
97d2fb |
|| shdr_info[cnt].shdr.sh_type == SHT_SYMTAB))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Make sure the data is loaded. */
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].data == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr_info[cnt].data
|
|
Packit Service |
97d2fb |
= elf_getdata (shdr_info[cnt].scn, NULL);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].data == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
Elf_Data *symdata = shdr_info[cnt].data;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If there is an extended section index table load it
|
|
Packit Service |
97d2fb |
as well. */
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].symtab_idx != 0
|
|
Packit Service |
97d2fb |
&& shdr_info[shdr_info[cnt].symtab_idx].data == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
shdr_info[shdr_info[cnt].symtab_idx].data
|
|
Packit Service |
97d2fb |
= elf_getdata (shdr_info[shdr_info[cnt].symtab_idx].scn,
|
|
Packit Service |
97d2fb |
NULL);
|
|
Packit Service |
97d2fb |
if (shdr_info[shdr_info[cnt].symtab_idx].data == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
Elf_Data *xndxdata
|
|
Packit Service |
97d2fb |
= shdr_info[shdr_info[cnt].symtab_idx].data;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Go through all symbols and make sure the section they
|
|
Packit Service |
97d2fb |
reference is not removed. */
|
|
Packit Service |
97d2fb |
size_t elsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
for (size_t inner = 0;
|
|
Packit Service |
97d2fb |
inner < shdr_info[cnt].data->d_size / elsize;
|
|
Packit Service |
97d2fb |
++inner)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Sym sym_mem;
|
|
Packit Service |
97d2fb |
Elf32_Word xndx;
|
|
Packit Service |
97d2fb |
GElf_Sym *sym = gelf_getsymshndx (symdata, xndxdata,
|
|
Packit Service |
97d2fb |
inner, &sym_mem,
|
|
Packit Service |
97d2fb |
&xndx);
|
|
Packit Service |
97d2fb |
if (sym == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t scnidx = sym->st_shndx;
|
|
Packit Service |
97d2fb |
if (scnidx == SHN_UNDEF || scnidx >= shnum
|
|
Packit Service |
97d2fb |
|| (scnidx >= SHN_LORESERVE
|
|
Packit Service |
97d2fb |
&& scnidx <= SHN_HIRESERVE
|
|
Packit Service |
97d2fb |
&& scnidx != SHN_XINDEX)
|
|
Packit Service |
97d2fb |
/* Don't count in the section symbols. */
|
|
Packit Service |
97d2fb |
|| GELF_ST_TYPE (sym->st_info) == STT_SECTION)
|
|
Packit Service |
97d2fb |
/* This is no section index, leave it alone. */
|
|
Packit Service |
97d2fb |
continue;
|
|
Packit Service |
97d2fb |
else if (scnidx == SHN_XINDEX)
|
|
Packit Service |
97d2fb |
scnidx = xndx;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (scnidx >= shnum)
|
|
Packit Service |
97d2fb |
goto illformed;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr_info[scnidx].idx == 0)
|
|
Packit Service |
97d2fb |
/* This symbol table has a real symbol in
|
|
Packit Service |
97d2fb |
a discarded section. So preserve the
|
|
Packit Service |
97d2fb |
original table in the debug file. Unless
|
|
Packit Service |
97d2fb |
it is a redundant data marker to a debug
|
|
Packit Service |
97d2fb |
(data only) section. */
|
|
Packit Service |
97d2fb |
if (! (ebl_section_strip_p (ebl,
|
|
Packit Service |
97d2fb |
&shdr_info[scnidx].shdr,
|
|
Packit Service |
97d2fb |
shdr_info[scnidx].name,
|
|
Packit Service |
97d2fb |
remove_comment,
|
|
Packit Service |
97d2fb |
remove_debug)
|
|
Packit Service |
97d2fb |
&& ebl_data_marker_symbol (ebl, sym,
|
|
Packit Service |
97d2fb |
elf_strptr (elf,
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_link,
|
|
Packit Service |
97d2fb |
sym->st_name))))
|
|
Packit Service |
97d2fb |
shdr_info[cnt].debug_data = symdata;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Cross referencing happens:
|
|
Packit Service |
97d2fb |
- for the cases the ELF specification says. That are
|
|
Packit Service |
97d2fb |
+ SHT_DYNAMIC in sh_link to string table
|
|
Packit Service |
97d2fb |
+ SHT_HASH in sh_link to symbol table
|
|
Packit Service |
97d2fb |
+ SHT_REL and SHT_RELA in sh_link to symbol table
|
|
Packit Service |
97d2fb |
+ SHT_SYMTAB and SHT_DYNSYM in sh_link to string table
|
|
Packit Service |
97d2fb |
+ SHT_GROUP in sh_link to symbol table
|
|
Packit Service |
97d2fb |
+ SHT_SYMTAB_SHNDX in sh_link to symbol table
|
|
Packit Service |
97d2fb |
Other (OS or architecture-specific) sections might as
|
|
Packit Service |
97d2fb |
well use this field so we process it unconditionally.
|
|
Packit Service |
97d2fb |
- references inside section groups
|
|
Packit Service |
97d2fb |
- specially marked references in sh_info if the SHF_INFO_LINK
|
|
Packit Service |
97d2fb |
flag is set
|
|
Packit Service |
97d2fb |
*/
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr_info[shdr_info[cnt].shdr.sh_link].idx == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr_info[shdr_info[cnt].shdr.sh_link].idx = 1;
|
|
Packit Service |
97d2fb |
changes |= shdr_info[cnt].shdr.sh_link < cnt;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Handle references through sh_info. */
|
|
Packit Service |
97d2fb |
if (SH_INFO_LINK_P (&shdr_info[cnt].shdr))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_info >= shnum)
|
|
Packit Service |
97d2fb |
goto illformed;
|
|
Packit Service |
97d2fb |
else if ( shdr_info[shdr_info[cnt].shdr.sh_info].idx == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr_info[shdr_info[cnt].shdr.sh_info].idx = 1;
|
|
Packit Service |
97d2fb |
changes |= shdr_info[cnt].shdr.sh_info < cnt;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Mark the section as investigated. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx = 2;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (debug_fname != NULL
|
|
Packit Service |
97d2fb |
&& (shdr_info[cnt].idx == 0 || shdr_info[cnt].debug_data != NULL))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* This section is being preserved in the debug file.
|
|
Packit Service |
97d2fb |
Sections it refers to must be preserved there too.
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
In this pass we mark sections to be preserved in both
|
|
Packit Service |
97d2fb |
files by setting the .debug_data pointer to the original
|
|
Packit Service |
97d2fb |
file's .data pointer. Below, we'll copy the section
|
|
Packit Service |
97d2fb |
contents. */
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
inline void check_preserved (size_t i)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (i != 0 && i < shnum + 2 && shdr_info[i].idx != 0
|
|
Packit Service |
97d2fb |
&& shdr_info[i].debug_data == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (shdr_info[i].data == NULL)
|
|
Packit Service |
97d2fb |
shdr_info[i].data = elf_getdata (shdr_info[i].scn, NULL);
|
|
Packit Service |
97d2fb |
if (shdr_info[i].data == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
shdr_info[i].debug_data = shdr_info[i].data;
|
|
Packit Service |
97d2fb |
changes |= i < cnt;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
check_preserved (shdr_info[cnt].shdr.sh_link);
|
|
Packit Service |
97d2fb |
if (SH_INFO_LINK_P (&shdr_info[cnt].shdr))
|
|
Packit Service |
97d2fb |
check_preserved (shdr_info[cnt].shdr.sh_info);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
while (changes);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Copy the removed sections to the debug output file.
|
|
Packit Service |
97d2fb |
The ones that are not removed in the stripped file are SHT_NOBITS. */
|
|
Packit Service |
97d2fb |
if (debug_fname != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
for (cnt = 1; cnt < shnum; ++cnt)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
scn = elf_newscn (debugelf);
|
|
Packit Service |
97d2fb |
if (scn == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0,
|
|
Packit Service |
97d2fb |
gettext ("while generating output file: %s"),
|
|
Packit Service |
97d2fb |
elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
bool discard_section = (shdr_info[cnt].idx > 0
|
|
Packit Service |
97d2fb |
&& shdr_info[cnt].debug_data == NULL
|
|
Packit Service |
97d2fb |
&& shdr_info[cnt].shdr.sh_type != SHT_NOTE
|
|
Packit Service |
97d2fb |
&& shdr_info[cnt].shdr.sh_type != SHT_GROUP
|
|
Packit Service |
97d2fb |
&& cnt != shstrndx);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Set the section header in the new file. */
|
|
Packit Service |
97d2fb |
GElf_Shdr debugshdr = shdr_info[cnt].shdr;
|
|
Packit Service |
97d2fb |
if (discard_section)
|
|
Packit Service |
97d2fb |
debugshdr.sh_type = SHT_NOBITS;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_update_shdr (scn, &debugshdr) == 0))
|
|
Packit Service |
97d2fb |
/* There cannot be any overflows. */
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the data from the old file if necessary. */
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].data == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr_info[cnt].data = elf_getdata (shdr_info[cnt].scn, NULL);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].data == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Set the data. This is done by copying from the old file. */
|
|
Packit Service |
97d2fb |
Elf_Data *debugdata = elf_newdata (scn);
|
|
Packit Service |
97d2fb |
if (debugdata == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Copy the structure. This data may be modified in place
|
|
Packit Service |
97d2fb |
before we write out the file. */
|
|
Packit Service |
97d2fb |
*debugdata = *shdr_info[cnt].data;
|
|
Packit Service |
97d2fb |
if (discard_section)
|
|
Packit Service |
97d2fb |
debugdata->d_buf = NULL;
|
|
Packit Service |
97d2fb |
else if (shdr_info[cnt].debug_data != NULL
|
|
Packit Service |
97d2fb |
|| shdr_info[cnt].shdr.sh_type == SHT_GROUP)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Copy the original data before it gets modified. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].debug_data = debugdata;
|
|
Packit Service |
97d2fb |
if (debugdata->d_buf == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
debugdata->d_buf = memcpy (xmalloc (debugdata->d_size),
|
|
Packit Service |
97d2fb |
debugdata->d_buf, debugdata->d_size);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Finish the ELF header. Fill in the fields not handled by
|
|
Packit Service |
97d2fb |
libelf from the old file. */
|
|
Packit Service |
97d2fb |
debugehdr = gelf_getehdr (debugelf, &debugehdr_mem);
|
|
Packit Service |
97d2fb |
if (debugehdr == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
memcpy (debugehdr->e_ident, ehdr->e_ident, EI_NIDENT);
|
|
Packit Service |
97d2fb |
debugehdr->e_type = ehdr->e_type;
|
|
Packit Service |
97d2fb |
debugehdr->e_machine = ehdr->e_machine;
|
|
Packit Service |
97d2fb |
debugehdr->e_version = ehdr->e_version;
|
|
Packit Service |
97d2fb |
debugehdr->e_entry = ehdr->e_entry;
|
|
Packit Service |
97d2fb |
debugehdr->e_flags = ehdr->e_flags;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_update_ehdr (debugelf, debugehdr) == 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("%s: error while updating ELF header: %s"),
|
|
Packit Service |
97d2fb |
debug_fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t shdrstrndx;
|
|
Packit Service |
97d2fb |
if (elf_getshdrstrndx (elf, &shdrstrndx) < 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("%s: error while getting shdrstrndx: %s"),
|
|
Packit Service |
97d2fb |
fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (update_shdrstrndx (debugelf, shdrstrndx) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("%s: error updating shdrstrndx: %s"),
|
|
Packit Service |
97d2fb |
debug_fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Although we always create a new section header string table we
|
|
Packit Service |
97d2fb |
don't explicitly mark the existing one as unused. It can still
|
|
Packit Service |
97d2fb |
be used through a symbol table section we are keeping. If not it
|
|
Packit Service |
97d2fb |
will already be marked as unused. */
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We need a string table for the section headers. */
|
|
Packit Service |
97d2fb |
shst = dwelf_strtab_init (true);
|
|
Packit Service |
97d2fb |
if (shst == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, errno, gettext ("while preparing output for '%s'"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Assign new section numbers. */
|
|
Packit Service |
97d2fb |
shdr_info[0].idx = 0;
|
|
Packit Service |
97d2fb |
for (cnt = idx = 1; cnt < shnum; ++cnt)
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].idx > 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx = idx++;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create a new section. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].newscn = elf_newscn (newelf);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].newscn == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0,
|
|
Packit Service |
97d2fb |
gettext ("while generating output file: %s"),
|
|
Packit Service |
97d2fb |
elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Add this name to the section header string table. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].se = dwelf_strtab_add (shst, shdr_info[cnt].name);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Test whether we are doing anything at all. Either all removable
|
|
Packit Service |
97d2fb |
sections are already gone. Or the only section we would remove is
|
|
Packit Service |
97d2fb |
the .shstrtab section which we would add again. */
|
|
Packit Service |
97d2fb |
bool removing_sections = !(cnt == idx
|
|
Packit Service |
97d2fb |
|| (cnt == idx + 1
|
|
Packit Service |
97d2fb |
&& shdr_info[shstrndx].idx == 0));
|
|
Packit Service |
97d2fb |
if (output_fname == NULL && !removing_sections)
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create the reference to the file with the debug info (if any). */
|
|
Packit Service |
97d2fb |
if (debug_fname != NULL && !remove_shdrs && removing_sections)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Add the section header string table section name. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].se = dwelf_strtab_add_len (shst, ".gnu_debuglink", 15);
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx = idx++;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create the section header. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_type = SHT_PROGBITS;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_flags = 0;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_addr = 0;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_link = SHN_UNDEF;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_info = SHN_UNDEF;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_entsize = 0;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_addralign = 4;
|
|
Packit Service |
97d2fb |
/* We set the offset to zero here. Before we write the ELF file the
|
|
Packit Service |
97d2fb |
field must have the correct value. This is done in the final
|
|
Packit Service |
97d2fb |
loop over all section. Then we have all the information needed. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_offset = 0;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create the section. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].newscn = elf_newscn (newelf);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].newscn == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0,
|
|
Packit Service |
97d2fb |
gettext ("while create section header section: %s"),
|
|
Packit Service |
97d2fb |
elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
shdr_info[cnt].data = elf_newdata (shdr_info[cnt].newscn);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].data == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0, gettext ("cannot allocate section data: %s"),
|
|
Packit Service |
97d2fb |
elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
char *debug_basename = basename (debug_fname_embed ?: debug_fname);
|
|
Packit Service |
97d2fb |
off_t crc_offset = strlen (debug_basename) + 1;
|
|
Packit Service |
97d2fb |
/* Align to 4 byte boundary */
|
|
Packit Service |
97d2fb |
crc_offset = ((crc_offset - 1) & ~3) + 4;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
shdr_info[cnt].data->d_align = 4;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_size = shdr_info[cnt].data->d_size
|
|
Packit Service |
97d2fb |
= crc_offset + 4;
|
|
Packit Service |
97d2fb |
debuglink_buf = xcalloc (1, shdr_info[cnt].data->d_size);
|
|
Packit Service |
97d2fb |
shdr_info[cnt].data->d_buf = debuglink_buf;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
strcpy (shdr_info[cnt].data->d_buf, debug_basename);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Cache this Elf_Data describing the CRC32 word in the section.
|
|
Packit Service |
97d2fb |
We'll fill this in when we have written the debug file. */
|
|
Packit Service |
97d2fb |
debuglink_crc_data = *shdr_info[cnt].data;
|
|
Packit Service |
97d2fb |
debuglink_crc_data.d_buf = ((char *) debuglink_crc_data.d_buf
|
|
Packit Service |
97d2fb |
+ crc_offset);
|
|
Packit Service |
97d2fb |
debuglink_crc_data.d_size = 4;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* One more section done. */
|
|
Packit Service |
97d2fb |
++cnt;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Index of the section header table in the shdr_info array. */
|
|
Packit Service |
97d2fb |
shdridx = cnt;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Add the section header string table section name. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].se = dwelf_strtab_add_len (shst, ".shstrtab", 10);
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx = idx;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create the section header. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_type = SHT_STRTAB;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_flags = 0;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_addr = 0;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_link = SHN_UNDEF;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_info = SHN_UNDEF;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_entsize = 0;
|
|
Packit Service |
97d2fb |
/* We set the offset to zero here. Before we write the ELF file the
|
|
Packit Service |
97d2fb |
field must have the correct value. This is done in the final
|
|
Packit Service |
97d2fb |
loop over all section. Then we have all the information needed. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_offset = 0;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_addralign = 1;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create the section. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].newscn = elf_newscn (newelf);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].newscn == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0,
|
|
Packit Service |
97d2fb |
gettext ("while create section header section: %s"),
|
|
Packit Service |
97d2fb |
elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == idx);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Finalize the string table and fill in the correct indices in the
|
|
Packit Service |
97d2fb |
section headers. */
|
|
Packit Service |
97d2fb |
shstrtab_data = elf_newdata (shdr_info[cnt].newscn);
|
|
Packit Service |
97d2fb |
if (shstrtab_data == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0,
|
|
Packit Service |
97d2fb |
gettext ("while create section header string table: %s"),
|
|
Packit Service |
97d2fb |
elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
if (dwelf_strtab_finalize (shst, shstrtab_data) == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
error (EXIT_FAILURE, 0,
|
|
Packit Service |
97d2fb |
gettext ("no memory to create section header string table"));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We have to set the section size. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_size = shstrtab_data->d_size;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Update the section information. */
|
|
Packit Service |
97d2fb |
GElf_Off lastoffset = 0;
|
|
Packit Service |
97d2fb |
for (cnt = 1; cnt <= shdridx; ++cnt)
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].idx > 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf_Data *newdata;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
scn = elf_getscn (newelf, shdr_info[cnt].idx);
|
|
Packit Service |
97d2fb |
elf_assert (scn != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Update the name. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_name = dwelf_strent_off (shdr_info[cnt].se);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Update the section header from the input file. Some fields
|
|
Packit Service |
97d2fb |
might be section indeces which now have to be adjusted. Keep
|
|
Packit Service |
97d2fb |
the index to the "current" sh_link in case we need it to lookup
|
|
Packit Service |
97d2fb |
symbol table names. */
|
|
Packit Service |
97d2fb |
size_t sh_link = shdr_info[cnt].shdr.sh_link;
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_link != 0)
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_link =
|
|
Packit Service |
97d2fb |
shdr_info[shdr_info[cnt].shdr.sh_link].idx;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_type == SHT_GROUP)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[cnt].data != NULL
|
|
Packit Service |
97d2fb |
&& shdr_info[cnt].data->d_buf != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
Elf32_Word *grpref = (Elf32_Word *) shdr_info[cnt].data->d_buf;
|
|
Packit Service |
97d2fb |
/* First word is the section group flag.
|
|
Packit Service |
97d2fb |
Followed by section indexes, that need to be renumbered. */
|
|
Packit Service |
97d2fb |
for (size_t inner = 1;
|
|
Packit Service |
97d2fb |
inner < shdr_info[cnt].data->d_size / sizeof (Elf32_Word);
|
|
Packit Service |
97d2fb |
++inner)
|
|
Packit Service |
97d2fb |
if (grpref[inner] < shnum)
|
|
Packit Service |
97d2fb |
grpref[inner] = shdr_info[grpref[inner]].idx;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
goto illformed;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Handle the SHT_REL, SHT_RELA, and SHF_INFO_LINK flag. */
|
|
Packit Service |
97d2fb |
if (SH_INFO_LINK_P (&shdr_info[cnt].shdr))
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_info =
|
|
Packit Service |
97d2fb |
shdr_info[shdr_info[cnt].shdr.sh_info].idx;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the data from the old file if necessary. We already
|
|
Packit Service |
97d2fb |
created the data for the section header string table. */
|
|
Packit Service |
97d2fb |
if (cnt < shnum)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].data == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
shdr_info[cnt].data = elf_getdata (shdr_info[cnt].scn, NULL);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].data == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Set the data. This is done by copying from the old file. */
|
|
Packit Service |
97d2fb |
newdata = elf_newdata (scn);
|
|
Packit Service |
97d2fb |
if (newdata == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Copy the structure. */
|
|
Packit Service |
97d2fb |
*newdata = *shdr_info[cnt].data;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We know the size. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_size = shdr_info[cnt].data->d_size;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We have to adjust symbol tables. The st_shndx member might
|
|
Packit Service |
97d2fb |
have to be updated. */
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM
|
|
Packit Service |
97d2fb |
|| shdr_info[cnt].shdr.sh_type == SHT_SYMTAB)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf_Data *versiondata = NULL;
|
|
Packit Service |
97d2fb |
Elf_Data *shndxdata = NULL;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t elsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].symtab_idx != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB_SHNDX);
|
|
Packit Service |
97d2fb |
/* This section has extended section information.
|
|
Packit Service |
97d2fb |
We have to modify that information, too. */
|
|
Packit Service |
97d2fb |
shndxdata = elf_getdata (shdr_info[shdr_info[cnt].symtab_idx].scn,
|
|
Packit Service |
97d2fb |
NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
elf_assert (shndxdata != NULL
|
|
Packit Service |
97d2fb |
&& shndxdata->d_buf != NULL
|
|
Packit Service |
97d2fb |
&& ((shndxdata->d_size / sizeof (Elf32_Word))
|
|
Packit Service |
97d2fb |
>= shdr_info[cnt].data->d_size / elsize));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].version_idx != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM);
|
|
Packit Service |
97d2fb |
/* This section has associated version
|
|
Packit Service |
97d2fb |
information. We have to modify that
|
|
Packit Service |
97d2fb |
information, too. */
|
|
Packit Service |
97d2fb |
versiondata = elf_getdata (shdr_info[shdr_info[cnt].version_idx].scn,
|
|
Packit Service |
97d2fb |
NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
elf_assert (versiondata != NULL
|
|
Packit Service |
97d2fb |
&& versiondata->d_buf != NULL
|
|
Packit Service |
97d2fb |
&& ((versiondata->d_size / sizeof (GElf_Versym))
|
|
Packit Service |
97d2fb |
>= shdr_info[cnt].data->d_size / elsize));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
shdr_info[cnt].newsymidx
|
|
Packit Service |
97d2fb |
= (Elf32_Word *) xcalloc (shdr_info[cnt].data->d_size
|
|
Packit Service |
97d2fb |
/ elsize, sizeof (Elf32_Word));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
bool last_was_local = true;
|
|
Packit Service |
97d2fb |
size_t destidx;
|
|
Packit Service |
97d2fb |
size_t inner;
|
|
Packit Service |
97d2fb |
for (destidx = inner = 1;
|
|
Packit Service |
97d2fb |
inner < shdr_info[cnt].data->d_size / elsize;
|
|
Packit Service |
97d2fb |
++inner)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf32_Word sec;
|
|
Packit Service |
97d2fb |
GElf_Sym sym_mem;
|
|
Packit Service |
97d2fb |
Elf32_Word xshndx;
|
|
Packit Service |
97d2fb |
GElf_Sym *sym = gelf_getsymshndx (shdr_info[cnt].data,
|
|
Packit Service |
97d2fb |
shndxdata, inner,
|
|
Packit Service |
97d2fb |
&sym_mem, &xshndx);
|
|
Packit Service |
97d2fb |
if (sym == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (sym->st_shndx == SHN_UNDEF
|
|
Packit Service |
97d2fb |
|| (sym->st_shndx >= SHN_LORESERVE
|
|
Packit Service |
97d2fb |
&& sym->st_shndx != SHN_XINDEX))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* This is no section index, leave it alone
|
|
Packit Service |
97d2fb |
unless it is moved. */
|
|
Packit Service |
97d2fb |
if (destidx != inner
|
|
Packit Service |
97d2fb |
&& gelf_update_symshndx (shdr_info[cnt].data,
|
|
Packit Service |
97d2fb |
shndxdata,
|
|
Packit Service |
97d2fb |
destidx, sym,
|
|
Packit Service |
97d2fb |
xshndx) == 0)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
shdr_info[cnt].newsymidx[inner] = destidx++;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (last_was_local
|
|
Packit Service |
97d2fb |
&& GELF_ST_BIND (sym->st_info) != STB_LOCAL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
last_was_local = false;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_info = destidx - 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
continue;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get the full section index, if necessary from the
|
|
Packit Service |
97d2fb |
XINDEX table. */
|
|
Packit Service |
97d2fb |
if (sym->st_shndx == SHN_XINDEX)
|
|
Packit Service |
97d2fb |
elf_assert (shndxdata != NULL
|
|
Packit Service |
97d2fb |
&& shndxdata->d_buf != NULL);
|
|
Packit Service |
97d2fb |
size_t sidx = (sym->st_shndx != SHN_XINDEX
|
|
Packit Service |
97d2fb |
? sym->st_shndx : xshndx);
|
|
Packit Service |
97d2fb |
elf_assert (sidx < shnum);
|
|
Packit Service |
97d2fb |
sec = shdr_info[sidx].idx;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (sec != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Section nshndx;
|
|
Packit Service |
97d2fb |
Elf32_Word nxshndx;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (sec < SHN_LORESERVE)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
nshndx = sec;
|
|
Packit Service |
97d2fb |
nxshndx = 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
nshndx = SHN_XINDEX;
|
|
Packit Service |
97d2fb |
nxshndx = sec;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
elf_assert (sec < SHN_LORESERVE || shndxdata != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if ((inner != destidx || nshndx != sym->st_shndx
|
|
Packit Service |
97d2fb |
|| (shndxdata != NULL && nxshndx != xshndx))
|
|
Packit Service |
97d2fb |
&& (sym->st_shndx = nshndx,
|
|
Packit Service |
97d2fb |
gelf_update_symshndx (shdr_info[cnt].data,
|
|
Packit Service |
97d2fb |
shndxdata,
|
|
Packit Service |
97d2fb |
destidx, sym,
|
|
Packit Service |
97d2fb |
nxshndx) == 0))
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
shdr_info[cnt].newsymidx[inner] = destidx++;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (last_was_local
|
|
Packit Service |
97d2fb |
&& GELF_ST_BIND (sym->st_info) != STB_LOCAL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
last_was_local = false;
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_info = destidx - 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else if ((shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) != 0
|
|
Packit Service |
97d2fb |
&& GELF_ST_TYPE (sym->st_info) != STT_SECTION
|
|
Packit Service |
97d2fb |
&& shdr_info[sidx].shdr.sh_type != SHT_GROUP)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Removing a real symbol from an allocated
|
|
Packit Service |
97d2fb |
symbol table is hard and probably a
|
|
Packit Service |
97d2fb |
mistake. Really removing it means
|
|
Packit Service |
97d2fb |
rewriting the dynamic segment and hash
|
|
Packit Service |
97d2fb |
sections. Just warn and set the symbol
|
|
Packit Service |
97d2fb |
section to UNDEF. */
|
|
Packit Service |
97d2fb |
error (0, 0,
|
|
Packit Service |
97d2fb |
gettext ("Cannot remove symbol [%zd] from allocated symbol table [%zd]"), inner, cnt);
|
|
Packit Service |
97d2fb |
sym->st_shndx = SHN_UNDEF;
|
|
Packit Service |
97d2fb |
if (gelf_update_sym (shdr_info[cnt].data, destidx,
|
|
Packit Service |
97d2fb |
sym) == 0)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
shdr_info[cnt].newsymidx[inner] = destidx++;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else if (debug_fname != NULL
|
|
Packit Service |
97d2fb |
&& shdr_info[cnt].debug_data == NULL)
|
|
Packit Service |
97d2fb |
/* The symbol points to a section that is discarded
|
|
Packit Service |
97d2fb |
but isn't preserved in the debug file. Check that
|
|
Packit Service |
97d2fb |
this is a section or group signature symbol
|
|
Packit Service |
97d2fb |
for a section which has been removed. Or a special
|
|
Packit Service |
97d2fb |
data marker symbol to a debug section. */
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_assert (GELF_ST_TYPE (sym->st_info) == STT_SECTION
|
|
Packit Service |
97d2fb |
|| ((shdr_info[sidx].shdr.sh_type
|
|
Packit Service |
97d2fb |
== SHT_GROUP)
|
|
Packit Service |
97d2fb |
&& (shdr_info[sidx].shdr.sh_info
|
|
Packit Service |
97d2fb |
== inner))
|
|
Packit Service |
97d2fb |
|| ebl_data_marker_symbol (ebl, sym,
|
|
Packit Service |
97d2fb |
elf_strptr (elf, sh_link,
|
|
Packit Service |
97d2fb |
sym->st_name)));
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (destidx != inner)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* The size of the symbol table changed. */
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_size = newdata->d_size
|
|
Packit Service |
97d2fb |
= destidx * elsize;
|
|
Packit Service |
97d2fb |
any_symtab_changes = true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* The symbol table didn't really change. */
|
|
Packit Service |
97d2fb |
free (shdr_info[cnt].newsymidx);
|
|
Packit Service |
97d2fb |
shdr_info[cnt].newsymidx = NULL;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If we have to, compute the offset of the section.
|
|
Packit Service |
97d2fb |
If allocate and unallocated sections are mixed, we only update
|
|
Packit Service |
97d2fb |
the allocated ones now. The unallocated ones come second. */
|
|
Packit Service |
97d2fb |
if (! mixed_allocated_unallocated
|
|
Packit Service |
97d2fb |
|| (shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_offset == 0)
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_offset
|
|
Packit Service |
97d2fb |
= ((lastoffset + shdr_info[cnt].shdr.sh_addralign - 1)
|
|
Packit Service |
97d2fb |
& ~((GElf_Off) (shdr_info[cnt].shdr.sh_addralign - 1)));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Set the section header in the new file. */
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_update_shdr (scn, &shdr_info[cnt].shdr) == 0))
|
|
Packit Service |
97d2fb |
/* There cannot be any overflows. */
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Remember the last section written so far. */
|
|
Packit Service |
97d2fb |
GElf_Off filesz = (shdr_info[cnt].shdr.sh_type != SHT_NOBITS
|
|
Packit Service |
97d2fb |
? shdr_info[cnt].shdr.sh_size : 0);
|
|
Packit Service |
97d2fb |
if (lastoffset < shdr_info[cnt].shdr.sh_offset + filesz)
|
|
Packit Service |
97d2fb |
lastoffset = shdr_info[cnt].shdr.sh_offset + filesz;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We might have to update the unallocated sections after we done the
|
|
Packit Service |
97d2fb |
allocated ones. lastoffset is set to right after the last allocated
|
|
Packit Service |
97d2fb |
section. */
|
|
Packit Service |
97d2fb |
if (mixed_allocated_unallocated)
|
|
Packit Service |
97d2fb |
for (cnt = 1; cnt <= shdridx; ++cnt)
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].idx > 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
scn = elf_getscn (newelf, shdr_info[cnt].idx);
|
|
Packit Service |
97d2fb |
if ((shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_offset == 0)
|
|
Packit Service |
97d2fb |
shdr_info[cnt].shdr.sh_offset
|
|
Packit Service |
97d2fb |
= ((lastoffset + shdr_info[cnt].shdr.sh_addralign - 1)
|
|
Packit Service |
97d2fb |
& ~((GElf_Off) (shdr_info[cnt].shdr.sh_addralign - 1)));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Set the section header in the new file. */
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_update_shdr (scn, &shdr_info[cnt].shdr) == 0))
|
|
Packit Service |
97d2fb |
/* There cannot be any overflows. */
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Remember the last section written so far. */
|
|
Packit Service |
97d2fb |
GElf_Off filesz = (shdr_info[cnt].shdr.sh_type != SHT_NOBITS
|
|
Packit Service |
97d2fb |
? shdr_info[cnt].shdr.sh_size : 0);
|
|
Packit Service |
97d2fb |
if (lastoffset < shdr_info[cnt].shdr.sh_offset + filesz)
|
|
Packit Service |
97d2fb |
lastoffset = shdr_info[cnt].shdr.sh_offset + filesz;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Adjust symbol references if symbol tables changed. */
|
|
Packit Service |
97d2fb |
if (any_symtab_changes)
|
|
Packit Service |
97d2fb |
/* Find all relocation sections which use this symbol table. */
|
|
Packit Service |
97d2fb |
for (cnt = 1; cnt <= shdridx; ++cnt)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Update section headers when the data size has changed.
|
|
Packit Service |
97d2fb |
We also update the SHT_NOBITS section in the debug
|
|
Packit Service |
97d2fb |
file so that the section headers match in sh_size. */
|
|
Packit Service |
97d2fb |
inline void update_section_size (const Elf_Data *newdata)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
|
|
Packit Service |
97d2fb |
shdr->sh_size = newdata->d_size;
|
|
Packit Service |
97d2fb |
(void) gelf_update_shdr (scn, shdr);
|
|
Packit Service |
97d2fb |
if (debugelf != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* libelf will use d_size to set sh_size. */
|
|
Packit Service |
97d2fb |
Elf_Data *debugdata = elf_getdata (elf_getscn (debugelf,
|
|
Packit Service |
97d2fb |
cnt), NULL);
|
|
Packit Service |
97d2fb |
if (debugdata == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
debugdata->d_size = newdata->d_size;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].idx == 0 && debug_fname == NULL)
|
|
Packit Service |
97d2fb |
/* Ignore sections which are discarded. When we are saving a
|
|
Packit Service |
97d2fb |
relocation section in a separate debug file, we must fix up
|
|
Packit Service |
97d2fb |
the symbol table references. */
|
|
Packit Service |
97d2fb |
continue;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
const Elf32_Word symtabidx = shdr_info[cnt].old_sh_link;
|
|
Packit Service |
97d2fb |
elf_assert (symtabidx < shnum + 2);
|
|
Packit Service |
97d2fb |
const Elf32_Word *const newsymidx = shdr_info[symtabidx].newsymidx;
|
|
Packit Service |
97d2fb |
switch (shdr_info[cnt].shdr.sh_type)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
inline bool no_symtab_updates (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* If the symbol table hasn't changed, do not do anything. */
|
|
Packit Service |
97d2fb |
if (shdr_info[symtabidx].newsymidx == NULL)
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If the symbol table is not discarded, but additionally
|
|
Packit Service |
97d2fb |
duplicated in the separate debug file and this section
|
|
Packit Service |
97d2fb |
is discarded, don't adjust anything. */
|
|
Packit Service |
97d2fb |
return (shdr_info[cnt].idx == 0
|
|
Packit Service |
97d2fb |
&& shdr_info[symtabidx].debug_data != NULL);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case SHT_REL:
|
|
Packit Service |
97d2fb |
case SHT_RELA:
|
|
Packit Service |
97d2fb |
if (no_symtab_updates ())
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
Elf_Data *d = elf_getdata (shdr_info[cnt].idx == 0
|
|
Packit Service |
97d2fb |
? elf_getscn (debugelf, cnt)
|
|
Packit Service |
97d2fb |
: elf_getscn (newelf,
|
|
Packit Service |
97d2fb |
shdr_info[cnt].idx),
|
|
Packit Service |
97d2fb |
NULL);
|
|
Packit Service |
97d2fb |
elf_assert (d != NULL && d->d_buf != NULL
|
|
Packit Service |
97d2fb |
&& shdr_info[cnt].shdr.sh_entsize != 0);
|
|
Packit Service |
97d2fb |
size_t nrels = (shdr_info[cnt].shdr.sh_size
|
|
Packit Service |
97d2fb |
/ shdr_info[cnt].shdr.sh_entsize);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t symsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
const Elf32_Word symidxn = (shdr_info[symtabidx].data->d_size
|
|
Packit Service |
97d2fb |
/ symsize);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_type == SHT_REL)
|
|
Packit Service |
97d2fb |
for (size_t relidx = 0; relidx < nrels; ++relidx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Rel rel_mem;
|
|
Packit Service |
97d2fb |
if (gelf_getrel (d, relidx, &rel_mem) == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t symidx = GELF_R_SYM (rel_mem.r_info);
|
|
Packit Service |
97d2fb |
elf_assert (symidx < symidxn);
|
|
Packit Service |
97d2fb |
if (newsymidx[symidx] != symidx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
rel_mem.r_info
|
|
Packit Service |
97d2fb |
= GELF_R_INFO (newsymidx[symidx],
|
|
Packit Service |
97d2fb |
GELF_R_TYPE (rel_mem.r_info));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (gelf_update_rel (d, relidx, &rel_mem) == 0)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
for (size_t relidx = 0; relidx < nrels; ++relidx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Rela rel_mem;
|
|
Packit Service |
97d2fb |
if (gelf_getrela (d, relidx, &rel_mem) == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t symidx = GELF_R_SYM (rel_mem.r_info);
|
|
Packit Service |
97d2fb |
elf_assert (symidx < symidxn);
|
|
Packit Service |
97d2fb |
if (newsymidx[symidx] != symidx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
rel_mem.r_info
|
|
Packit Service |
97d2fb |
= GELF_R_INFO (newsymidx[symidx],
|
|
Packit Service |
97d2fb |
GELF_R_TYPE (rel_mem.r_info));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (gelf_update_rela (d, relidx, &rel_mem) == 0)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case SHT_HASH:
|
|
Packit Service |
97d2fb |
if (no_symtab_updates ())
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We have to recompute the hash table. */
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[cnt].idx > 0);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The hash section in the new file. */
|
|
Packit Service |
97d2fb |
scn = elf_getscn (newelf, shdr_info[cnt].idx);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The symbol table data. */
|
|
Packit Service |
97d2fb |
Elf_Data *symd = elf_getdata (elf_getscn (newelf,
|
|
Packit Service |
97d2fb |
shdr_info[symtabidx].idx),
|
|
Packit Service |
97d2fb |
NULL);
|
|
Packit Service |
97d2fb |
elf_assert (symd != NULL && symd->d_buf != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The hash table data. */
|
|
Packit Service |
97d2fb |
Elf_Data *hashd = elf_getdata (scn, NULL);
|
|
Packit Service |
97d2fb |
elf_assert (hashd != NULL && hashd->d_buf != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].shdr.sh_entsize == sizeof (Elf32_Word))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Sane arches first. */
|
|
Packit Service |
97d2fb |
elf_assert (hashd->d_size >= 2 * sizeof (Elf32_Word));
|
|
Packit Service |
97d2fb |
Elf32_Word *bucket = (Elf32_Word *) hashd->d_buf;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t strshndx = shdr_info[symtabidx].old_sh_link;
|
|
Packit Service |
97d2fb |
size_t elsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
Elf32_Word nchain = bucket[1];
|
|
Packit Service |
97d2fb |
Elf32_Word nbucket = bucket[0];
|
|
Packit Service |
97d2fb |
uint64_t used_buf = ((2ULL + nchain + nbucket)
|
|
Packit Service |
97d2fb |
* sizeof (Elf32_Word));
|
|
Packit Service |
97d2fb |
elf_assert (used_buf <= hashd->d_size);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Adjust the nchain value. The symbol table size
|
|
Packit Service |
97d2fb |
changed. We keep the same size for the bucket array. */
|
|
Packit Service |
97d2fb |
bucket[1] = symd->d_size / elsize;
|
|
Packit Service |
97d2fb |
bucket += 2;
|
|
Packit Service |
97d2fb |
Elf32_Word *chain = bucket + nbucket;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* New size of the section. */
|
|
Packit Service |
97d2fb |
size_t n_size = ((2 + symd->d_size / elsize + nbucket)
|
|
Packit Service |
97d2fb |
* sizeof (Elf32_Word));
|
|
Packit Service |
97d2fb |
elf_assert (n_size <= hashd->d_size);
|
|
Packit Service |
97d2fb |
hashd->d_size = n_size;
|
|
Packit Service |
97d2fb |
update_section_size (hashd);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Clear the arrays. */
|
|
Packit Service |
97d2fb |
memset (bucket, '\0',
|
|
Packit Service |
97d2fb |
(symd->d_size / elsize + nbucket)
|
|
Packit Service |
97d2fb |
* sizeof (Elf32_Word));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
for (size_t inner = shdr_info[symtabidx].shdr.sh_info;
|
|
Packit Service |
97d2fb |
inner < symd->d_size / elsize; ++inner)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Sym sym_mem;
|
|
Packit Service |
97d2fb |
GElf_Sym *sym = gelf_getsym (symd, inner, &sym_mem);
|
|
Packit Service |
97d2fb |
elf_assert (sym != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
const char *name = elf_strptr (elf, strshndx,
|
|
Packit Service |
97d2fb |
sym->st_name);
|
|
Packit Service |
97d2fb |
elf_assert (name != NULL && nbucket != 0);
|
|
Packit Service |
97d2fb |
size_t hidx = elf_hash (name) % nbucket;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (bucket[hidx] == 0)
|
|
Packit Service |
97d2fb |
bucket[hidx] = inner;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
hidx = bucket[hidx];
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
while (chain[hidx] != 0 && chain[hidx] < nchain)
|
|
Packit Service |
97d2fb |
hidx = chain[hidx];
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
chain[hidx] = inner;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Alpha and S390 64-bit use 64-bit SHT_HASH entries. */
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[cnt].shdr.sh_entsize
|
|
Packit Service |
97d2fb |
== sizeof (Elf64_Xword));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
Elf64_Xword *bucket = (Elf64_Xword *) hashd->d_buf;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t strshndx = shdr_info[symtabidx].old_sh_link;
|
|
Packit Service |
97d2fb |
size_t elsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
elf_assert (symd->d_size >= 2 * sizeof (Elf64_Xword));
|
|
Packit Service |
97d2fb |
Elf64_Xword nbucket = bucket[0];
|
|
Packit Service |
97d2fb |
Elf64_Xword nchain = bucket[1];
|
|
Packit Service |
97d2fb |
uint64_t maxwords = hashd->d_size / sizeof (Elf64_Xword);
|
|
Packit Service |
97d2fb |
elf_assert (maxwords >= 2
|
|
Packit Service |
97d2fb |
&& maxwords - 2 >= nbucket
|
|
Packit Service |
97d2fb |
&& maxwords - 2 - nbucket >= nchain);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Adjust the nchain value. The symbol table size
|
|
Packit Service |
97d2fb |
changed. We keep the same size for the bucket array. */
|
|
Packit Service |
97d2fb |
bucket[1] = symd->d_size / elsize;
|
|
Packit Service |
97d2fb |
bucket += 2;
|
|
Packit Service |
97d2fb |
Elf64_Xword *chain = bucket + nbucket;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* New size of the section. */
|
|
Packit Service |
97d2fb |
size_t n_size = ((2 + symd->d_size / elsize + nbucket)
|
|
Packit Service |
97d2fb |
* sizeof (Elf64_Xword));
|
|
Packit Service |
97d2fb |
elf_assert (n_size <= hashd->d_size);
|
|
Packit Service |
97d2fb |
hashd->d_size = n_size;
|
|
Packit Service |
97d2fb |
update_section_size (hashd);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Clear the arrays. */
|
|
Packit Service |
97d2fb |
memset (bucket, '\0',
|
|
Packit Service |
97d2fb |
(symd->d_size / elsize + nbucket)
|
|
Packit Service |
97d2fb |
* sizeof (Elf64_Xword));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
for (size_t inner = shdr_info[symtabidx].shdr.sh_info;
|
|
Packit Service |
97d2fb |
inner < symd->d_size / elsize; ++inner)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Sym sym_mem;
|
|
Packit Service |
97d2fb |
GElf_Sym *sym = gelf_getsym (symd, inner, &sym_mem);
|
|
Packit Service |
97d2fb |
elf_assert (sym != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
const char *name = elf_strptr (elf, strshndx,
|
|
Packit Service |
97d2fb |
sym->st_name);
|
|
Packit Service |
97d2fb |
elf_assert (name != NULL && nbucket != 0);
|
|
Packit Service |
97d2fb |
size_t hidx = elf_hash (name) % nbucket;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (bucket[hidx] == 0)
|
|
Packit Service |
97d2fb |
bucket[hidx] = inner;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
hidx = bucket[hidx];
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
while (chain[hidx] != 0 && chain[hidx] < nchain)
|
|
Packit Service |
97d2fb |
hidx = chain[hidx];
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
chain[hidx] = inner;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case SHT_GNU_versym:
|
|
Packit Service |
97d2fb |
/* If the symbol table changed we have to adjust the entries. */
|
|
Packit Service |
97d2fb |
if (no_symtab_updates ())
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
elf_assert (shdr_info[cnt].idx > 0);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The symbol version section in the new file. */
|
|
Packit Service |
97d2fb |
scn = elf_getscn (newelf, shdr_info[cnt].idx);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The symbol table data. */
|
|
Packit Service |
97d2fb |
symd = elf_getdata (elf_getscn (newelf, shdr_info[symtabidx].idx),
|
|
Packit Service |
97d2fb |
NULL);
|
|
Packit Service |
97d2fb |
elf_assert (symd != NULL && symd->d_buf != NULL);
|
|
Packit Service |
97d2fb |
size_t symz = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
const Elf32_Word syms = (shdr_info[symtabidx].data->d_size / symz);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The version symbol data. */
|
|
Packit Service |
97d2fb |
Elf_Data *verd = elf_getdata (scn, NULL);
|
|
Packit Service |
97d2fb |
elf_assert (verd != NULL && verd->d_buf != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The symbol version array. */
|
|
Packit Service |
97d2fb |
GElf_Half *verstab = (GElf_Half *) verd->d_buf;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Walk through the list and */
|
|
Packit Service |
97d2fb |
size_t elsize = gelf_fsize (elf, verd->d_type, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
Elf32_Word vers = verd->d_size / elsize;
|
|
Packit Service |
97d2fb |
for (size_t inner = 1; inner < vers && inner < syms; ++inner)
|
|
Packit Service |
97d2fb |
if (newsymidx[inner] != 0 && newsymidx[inner] < vers)
|
|
Packit Service |
97d2fb |
/* Overwriting the same array works since the
|
|
Packit Service |
97d2fb |
reordering can only move entries to lower indices
|
|
Packit Service |
97d2fb |
in the array. */
|
|
Packit Service |
97d2fb |
verstab[newsymidx[inner]] = verstab[inner];
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* New size of the section. */
|
|
Packit Service |
97d2fb |
verd->d_size = gelf_fsize (newelf, verd->d_type,
|
|
Packit Service |
97d2fb |
symd->d_size
|
|
Packit Service |
97d2fb |
/ gelf_fsize (elf, symd->d_type, 1,
|
|
Packit Service |
97d2fb |
EV_CURRENT),
|
|
Packit Service |
97d2fb |
EV_CURRENT);
|
|
Packit Service |
97d2fb |
update_section_size (verd);
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case SHT_GROUP:
|
|
Packit Service |
97d2fb |
if (no_symtab_updates ())
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Yes, the symbol table changed.
|
|
Packit Service |
97d2fb |
Update the section header of the section group. */
|
|
Packit Service |
97d2fb |
scn = elf_getscn (newelf, shdr_info[cnt].idx);
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr_mem;
|
|
Packit Service |
97d2fb |
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
|
|
Packit Service |
97d2fb |
elf_assert (shdr != NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
size_t symsz = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
const Elf32_Word symn = (shdr_info[symtabidx].data->d_size
|
|
Packit Service |
97d2fb |
/ symsz);
|
|
Packit Service |
97d2fb |
elf_assert (shdr->sh_info < symn);
|
|
Packit Service |
97d2fb |
shdr->sh_info = newsymidx[shdr->sh_info];
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
(void) gelf_update_shdr (scn, shdr);
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Remove any relocations between debug sections in ET_REL
|
|
Packit Service |
97d2fb |
for the debug file when requested. These relocations are always
|
|
Packit Service |
97d2fb |
zero based between the unallocated sections. */
|
|
Packit Service |
97d2fb |
if (debug_fname != NULL && removing_sections
|
|
Packit Service |
97d2fb |
&& reloc_debug && ehdr->e_type == ET_REL)
|
|
Packit Service |
97d2fb |
remove_debug_relocations (ebl, debugelf, ehdr, fname, shstrndx);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Now that we have done all adjustments to the data,
|
|
Packit Service |
97d2fb |
we can actually write out the debug file. */
|
|
Packit Service |
97d2fb |
if (debug_fname != NULL && removing_sections)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Finally write the file. */
|
|
Packit Service |
97d2fb |
if (unlikely (elf_update (debugelf, ELF_C_WRITE) == -1))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("while writing '%s': %s"),
|
|
Packit Service |
97d2fb |
tmp_debug_fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create the real output file. First rename, then change the
|
|
Packit Service |
97d2fb |
mode. */
|
|
Packit Service |
97d2fb |
if (rename (tmp_debug_fname, debug_fname) != 0
|
|
Packit Service |
97d2fb |
|| fchmod (debug_fd, mode) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("while creating '%s'"), debug_fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The temporary file does not exist anymore. */
|
|
Packit Service |
97d2fb |
free (tmp_debug_fname);
|
|
Packit Service |
97d2fb |
tmp_debug_fname = NULL;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (!remove_shdrs)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
uint32_t debug_crc;
|
|
Packit Service |
97d2fb |
Elf_Data debug_crc_data =
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
.d_type = ELF_T_WORD,
|
|
Packit Service |
97d2fb |
.d_buf = &debug_crc,
|
|
Packit Service |
97d2fb |
.d_size = sizeof (debug_crc),
|
|
Packit Service |
97d2fb |
.d_version = EV_CURRENT
|
|
Packit Service |
97d2fb |
};
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Compute the checksum which we will add to the executable. */
|
|
Packit Service |
97d2fb |
if (crc32_file (debug_fd, &debug_crc) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("\
|
|
Packit Service |
97d2fb |
while computing checksum for debug information"));
|
|
Packit Service |
97d2fb |
unlink (debug_fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
goto fail_close;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Store it in the debuglink section data. */
|
|
Packit Service |
97d2fb |
if (unlikely (gelf_xlatetof (newelf, &debuglink_crc_data,
|
|
Packit Service |
97d2fb |
&debug_crc_data, ehdr->e_ident[EI_DATA])
|
|
Packit Service |
97d2fb |
!= &debuglink_crc_data))
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
lastsec_offset = shdr_info[shdridx].shdr.sh_offset;
|
|
Packit Service |
97d2fb |
lastsec_size = shdr_info[shdridx].shdr.sh_size;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
done:
|
|
Packit Service |
97d2fb |
/* Finally finish the ELF header. Fill in the fields not handled by
|
|
Packit Service |
97d2fb |
libelf from the old file. */
|
|
Packit Service |
97d2fb |
newehdr = gelf_getehdr (newelf, &newehdr_mem);
|
|
Packit Service |
97d2fb |
if (newehdr == NULL)
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
memcpy (newehdr->e_ident, ehdr->e_ident, EI_NIDENT);
|
|
Packit Service |
97d2fb |
newehdr->e_type = ehdr->e_type;
|
|
Packit Service |
97d2fb |
newehdr->e_machine = ehdr->e_machine;
|
|
Packit Service |
97d2fb |
newehdr->e_version = ehdr->e_version;
|
|
Packit Service |
97d2fb |
newehdr->e_entry = ehdr->e_entry;
|
|
Packit Service |
97d2fb |
newehdr->e_flags = ehdr->e_flags;
|
|
Packit Service |
97d2fb |
newehdr->e_phoff = ehdr->e_phoff;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We need to position the section header table. */
|
|
Packit Service |
97d2fb |
const size_t offsize = gelf_fsize (elf, ELF_T_OFF, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
newehdr->e_shoff = ((lastsec_offset + lastsec_size + offsize - 1)
|
|
Packit Service |
97d2fb |
& ~((GElf_Off) (offsize - 1)));
|
|
Packit Service |
97d2fb |
newehdr->e_shentsize = gelf_fsize (elf, ELF_T_SHDR, 1, EV_CURRENT);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (gelf_update_ehdr (newelf, newehdr) == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("%s: error while creating ELF header: %s"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The new section header string table index. */
|
|
Packit Service |
97d2fb |
if (update_shdrstrndx (newelf, idx) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("%s: error updating shdrstrndx: %s"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* We have everything from the old file. */
|
|
Packit Service |
97d2fb |
if (elf_cntl (elf, ELF_C_FDDONE) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("%s: error while reading the file: %s"),
|
|
Packit Service |
97d2fb |
fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
return 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The ELF library better follows our layout when this is not a
|
|
Packit Service |
97d2fb |
relocatable object file. */
|
|
Packit Service |
97d2fb |
elf_flagelf (newelf, ELF_C_SET,
|
|
Packit Service |
97d2fb |
(phnum > 0 ? ELF_F_LAYOUT : 0)
|
|
Packit Service |
97d2fb |
| (permissive ? ELF_F_PERMISSIVE : 0));
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Finally write the file. */
|
|
Packit Service |
97d2fb |
if (elf_update (newelf, ELF_C_WRITE) == -1)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("while writing '%s': %s"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (remove_shdrs)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* libelf can't cope without the section headers being properly intact.
|
|
Packit Service |
97d2fb |
So we just let it write them normally, and then we nuke them later. */
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (newehdr->e_ident[EI_CLASS] == ELFCLASS32)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
assert (offsetof (Elf32_Ehdr, e_shentsize) + sizeof (Elf32_Half)
|
|
Packit Service |
97d2fb |
== offsetof (Elf32_Ehdr, e_shnum));
|
|
Packit Service |
97d2fb |
assert (offsetof (Elf32_Ehdr, e_shnum) + sizeof (Elf32_Half)
|
|
Packit Service |
97d2fb |
== offsetof (Elf32_Ehdr, e_shstrndx));
|
|
Packit Service |
97d2fb |
const Elf32_Off zero_off = 0;
|
|
Packit Service |
97d2fb |
const Elf32_Half zero[3] = { 0, 0, SHN_UNDEF };
|
|
Packit Service |
97d2fb |
if (pwrite_retry (fd, &zero_off, sizeof zero_off,
|
|
Packit Service |
97d2fb |
offsetof (Elf32_Ehdr, e_shoff)) != sizeof zero_off
|
|
Packit Service |
97d2fb |
|| (pwrite_retry (fd, zero, sizeof zero,
|
|
Packit Service |
97d2fb |
offsetof (Elf32_Ehdr, e_shentsize))
|
|
Packit Service |
97d2fb |
!= sizeof zero)
|
|
Packit Service |
97d2fb |
|| ftruncate (fd, lastsec_offset) < 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("while writing '%s'"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
assert (offsetof (Elf64_Ehdr, e_shentsize) + sizeof (Elf64_Half)
|
|
Packit Service |
97d2fb |
== offsetof (Elf64_Ehdr, e_shnum));
|
|
Packit Service |
97d2fb |
assert (offsetof (Elf64_Ehdr, e_shnum) + sizeof (Elf64_Half)
|
|
Packit Service |
97d2fb |
== offsetof (Elf64_Ehdr, e_shstrndx));
|
|
Packit Service |
97d2fb |
const Elf64_Off zero_off = 0;
|
|
Packit Service |
97d2fb |
const Elf64_Half zero[3] = { 0, 0, SHN_UNDEF };
|
|
Packit Service |
97d2fb |
if (pwrite_retry (fd, &zero_off, sizeof zero_off,
|
|
Packit Service |
97d2fb |
offsetof (Elf64_Ehdr, e_shoff)) != sizeof zero_off
|
|
Packit Service |
97d2fb |
|| (pwrite_retry (fd, zero, sizeof zero,
|
|
Packit Service |
97d2fb |
offsetof (Elf64_Ehdr, e_shentsize))
|
|
Packit Service |
97d2fb |
!= sizeof zero)
|
|
Packit Service |
97d2fb |
|| ftruncate (fd, lastsec_offset) < 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("while writing '%s'"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
fail_close:
|
|
Packit Service |
97d2fb |
if (shdr_info != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* For some sections we might have created an table to map symbol
|
|
Packit Service |
97d2fb |
table indices. Or we might kept (original) data around to put
|
|
Packit Service |
97d2fb |
into the .debug file. */
|
|
Packit Service |
97d2fb |
for (cnt = 1; cnt <= shdridx; ++cnt)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
free (shdr_info[cnt].newsymidx);
|
|
Packit Service |
97d2fb |
if (shdr_info[cnt].debug_data != NULL)
|
|
Packit Service |
97d2fb |
free (shdr_info[cnt].debug_data->d_buf);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Free data we allocated for the .gnu_debuglink section. */
|
|
Packit Service |
97d2fb |
free (debuglink_buf);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Free the memory. */
|
|
Packit Service |
97d2fb |
if ((shnum + 2) * sizeof (struct shdr_info) > MAX_STACK_ALLOC)
|
|
Packit Service |
97d2fb |
free (shdr_info);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Free other resources. */
|
|
Packit Service |
97d2fb |
if (shstrtab_data != NULL)
|
|
Packit Service |
97d2fb |
free (shstrtab_data->d_buf);
|
|
Packit Service |
97d2fb |
if (shst != NULL)
|
|
Packit Service |
97d2fb |
dwelf_strtab_free (shst);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* That was it. Close the descriptors. */
|
|
Packit Service |
97d2fb |
if (elf_end (newelf) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("error while finishing '%s': %s"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname, elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (debugelf != NULL && elf_end (debugelf) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, 0, gettext ("error while finishing '%s': %s"), debug_fname,
|
|
Packit Service |
97d2fb |
elf_errmsg (-1));
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
fail:
|
|
Packit Service |
97d2fb |
/* Close the EBL backend. */
|
|
Packit Service |
97d2fb |
if (ebl != NULL)
|
|
Packit Service |
97d2fb |
ebl_closebackend (ebl);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
cleanup_debug ();
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If requested, preserve the timestamp. */
|
|
Packit Service |
97d2fb |
if (tvp != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (futimens (fd, tvp) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("\
|
|
Packit Service |
97d2fb |
cannot set access and modification date of '%s'"),
|
|
Packit Service |
97d2fb |
output_fname ?: fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Close the file descriptor if we created a new file. */
|
|
Packit Service |
97d2fb |
if (output_fname != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
close (fd);
|
|
Packit Service |
97d2fb |
if (result != 0)
|
|
Packit Service |
97d2fb |
unlink (output_fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return result;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static void
|
|
Packit Service |
97d2fb |
cleanup_debug (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (debug_fd >= 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (tmp_debug_fname != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
unlink (tmp_debug_fname);
|
|
Packit Service |
97d2fb |
free (tmp_debug_fname);
|
|
Packit Service |
97d2fb |
tmp_debug_fname = NULL;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
close (debug_fd);
|
|
Packit Service |
97d2fb |
debug_fd = -1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static int
|
|
Packit Service |
97d2fb |
handle_ar (int fd, Elf *elf, const char *prefix, const char *fname,
|
|
Packit Service |
97d2fb |
struct timespec tvp[2])
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
size_t prefix_len = prefix == NULL ? 0 : strlen (prefix);
|
|
Packit Service |
97d2fb |
size_t fname_len = strlen (fname) + 1;
|
|
Packit Service |
97d2fb |
char new_prefix[prefix_len + 1 + fname_len];
|
|
Packit Service |
97d2fb |
char *cp = new_prefix;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Create the full name of the file. */
|
|
Packit Service |
97d2fb |
if (prefix != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
cp = mempcpy (cp, prefix, prefix_len);
|
|
Packit Service |
97d2fb |
*cp++ = ':';
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
memcpy (cp, fname, fname_len);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Process all the files contained in the archive. */
|
|
Packit Service |
97d2fb |
Elf *subelf;
|
|
Packit Service |
97d2fb |
Elf_Cmd cmd = ELF_C_RDWR;
|
|
Packit Service |
97d2fb |
int result = 0;
|
|
Packit Service |
97d2fb |
while ((subelf = elf_begin (fd, cmd, elf)) != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* The the header for this element. */
|
|
Packit Service |
97d2fb |
Elf_Arhdr *arhdr = elf_getarhdr (subelf);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (elf_kind (subelf) == ELF_K_ELF)
|
|
Packit Service |
97d2fb |
result |= handle_elf (fd, subelf, new_prefix, arhdr->ar_name, 0, NULL);
|
|
Packit Service |
97d2fb |
else if (elf_kind (subelf) == ELF_K_AR)
|
|
Packit Service |
97d2fb |
result |= handle_ar (fd, subelf, new_prefix, arhdr->ar_name, NULL);
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Get next archive element. */
|
|
Packit Service |
97d2fb |
cmd = elf_next (subelf);
|
|
Packit Service |
97d2fb |
if (unlikely (elf_end (subelf) != 0))
|
|
Packit Service |
97d2fb |
INTERNAL_ERROR (fname);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (tvp != NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (unlikely (futimens (fd, tvp) != 0))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
error (0, errno, gettext ("\
|
|
Packit Service |
97d2fb |
cannot set access and modification date of '%s'"), fname);
|
|
Packit Service |
97d2fb |
result = 1;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
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Packit Service |
97d2fb |
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Packit Service |
97d2fb |
if (unlikely (close (fd) != 0))
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Packit Service |
97d2fb |
error (EXIT_FAILURE, errno, gettext ("while closing '%s'"), fname);
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Packit Service |
97d2fb |
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Packit Service |
97d2fb |
return result;
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Packit Service |
97d2fb |
}
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Packit Service |
97d2fb |
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Packit Service |
97d2fb |
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Packit Service |
97d2fb |
#include "debugpred.h"
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