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/* Classification of ELF files.
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Copyright (C) 2019 Red Hat, Inc.
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This file is part of elfutils.
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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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#include <config.h>
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#include <argp.h>
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#include <error.h>
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#include <fcntl.h>
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#include <gelf.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include ELFUTILS_HEADER(elf)
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#include ELFUTILS_HEADER(dwelf)
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#include "printversion.h"
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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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/* Set by parse_opt. */
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static int verbose;
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/* Set by the main function. */
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static const char *current_path;
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/* Set by open_file. */
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static int file_fd = -1;
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/* Set by issue or elf_issue. */
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static bool issue_found;
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/* Non-fatal issue occured while processing the current_path. */
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static void
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issue (int e, const char *msg)
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{
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if (verbose >= 0)
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{
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if (current_path == NULL)
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error (0, e, "%s", msg);
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else
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error (0, e, "%s '%s'", msg, current_path);
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}
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issue_found = true;
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}
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/* Non-fatal issue occured while processing the current ELF. */
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static void
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elf_issue (const char *msg)
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{
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if (verbose >= 0)
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error (0, 0, "%s: %s: '%s'", msg, elf_errmsg (-1), current_path);
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issue_found = true;
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}
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/* Set by parse_opt. */
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static bool flag_only_regular_files;
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static bool
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open_file (void)
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{
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if (verbose > 1)
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fprintf (stderr, "debug: processing file: %s\n", current_path);
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file_fd = open (current_path, O_RDONLY | (flag_only_regular_files
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? O_NOFOLLOW : 0));
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if (file_fd < 0)
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{
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if (!flag_only_regular_files || errno != ELOOP)
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issue (errno, N_("opening"));
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return false;
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}
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struct stat st;
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if (fstat (file_fd, &st) != 0)
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{
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issue (errno, N_("reading"));
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return false;
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}
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/* Don't even bother with directories. */
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if (S_ISDIR (st.st_mode)
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|| (flag_only_regular_files && !S_ISREG (st.st_mode)))
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return false;
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return true;
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}
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static void
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close_file (void)
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{
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if (file_fd >= 0)
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{
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close (file_fd);
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file_fd = -1;
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}
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}
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/* Set by open_elf. */
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static Elf *elf;
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/* Set by parse_opt. */
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static bool flag_compressed;
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static bool
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open_elf (void)
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{
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if (!open_file ())
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{
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/* Make sure the file descriptor is gone. */
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close_file ();
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return false;
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}
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if (flag_compressed)
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elf = dwelf_elf_begin (file_fd);
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else
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elf = elf_begin (file_fd, ELF_C_READ, NULL);
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if (elf == NULL)
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{
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elf_issue ("opening ELF file");
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close_file ();
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return false;
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}
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return true;
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}
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static void
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close_elf (void)
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{
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if (elf != NULL)
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{
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elf_end (elf);
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elf = NULL;
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}
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close_file ();
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}
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static const char *
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elf_kind_string (int kind)
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{
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switch (kind)
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{
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case ELF_K_NONE:
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return "ELF_K_NONE";
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case ELF_K_AR:
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return "ELF_K_AR";
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case ELF_K_COFF:
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return "ELF_K_COFF"; /* libelf doesn't really support this. */
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case ELF_K_ELF:
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return "ELF_K_ELF";
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default:
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return "<unknown>";
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}
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}
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static const char *
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elf_type_string (int type)
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{
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switch (type)
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{
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case ET_NONE:
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return "ET_NONE";
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case ET_REL:
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return "ET_REL";
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case ET_EXEC:
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return "ET_EXEC";
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case ET_DYN:
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return "ET_DYN";
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case ET_CORE:
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return "ET_CORE";
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default:
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return "<unknown>";
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}
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}
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static int elf_type;
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static bool has_program_load;
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static bool has_sections;
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static bool has_bits_alloc;
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static bool has_program_interpreter;
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static bool has_dynamic;
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static bool has_soname;
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static bool has_pie_flag;
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static bool has_dt_debug;
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static bool has_symtab;
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static bool has_debug_sections;
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static bool has_modinfo;
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static bool has_gnu_linkonce_this_module;
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static bool
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run_classify (void)
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{
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/* Reset to unanalyzed default. */
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elf_type = 0;
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has_program_load = false;
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has_sections = false;
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has_bits_alloc = false;
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has_program_interpreter = false;
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has_dynamic = false;
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has_soname = false;
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has_pie_flag = false;
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has_dt_debug = false;
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has_symtab = false;
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has_debug_sections = false;
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has_modinfo = false;
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has_gnu_linkonce_this_module = false;
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int kind = elf_kind (elf);
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if (verbose > 0)
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fprintf (stderr, "info: %s: ELF kind: %s (0x%x)\n", current_path,
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elf_kind_string (kind), kind);
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if (kind != ELF_K_ELF)
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return true;
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GElf_Ehdr ehdr_storage;
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GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_storage);
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if (ehdr == NULL)
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{
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elf_issue (N_("ELF header"));
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return false;
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}
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elf_type = ehdr->e_type;
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/* Examine program headers. */
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GElf_Phdr dyn_seg = { .p_type = 0 };
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{
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size_t nphdrs;
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if (elf_getphdrnum (elf, &nphdrs) != 0)
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{
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elf_issue (N_("program headers"));
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return false;
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}
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for (size_t phdr_idx = 0; phdr_idx < nphdrs; ++phdr_idx)
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{
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GElf_Phdr phdr_storage;
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GElf_Phdr *phdr = gelf_getphdr (elf, phdr_idx, &phdr_storage);
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if (phdr == NULL)
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{
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elf_issue (N_("program header"));
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return false;
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}
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if (phdr->p_type == PT_DYNAMIC)
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{
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dyn_seg = *phdr;
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has_dynamic = true;
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}
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if (phdr->p_type == PT_INTERP)
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has_program_interpreter = true;
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if (phdr->p_type == PT_LOAD)
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has_program_load = true;
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}
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}
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/* Do we have sections? */
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{
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size_t nshdrs;
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if (elf_getshdrnum (elf, &nshdrs) != 0)
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{
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elf_issue (N_("section headers"));
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return false;
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}
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if (nshdrs > 0)
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has_sections = true;
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}
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{
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size_t shstrndx;
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if (unlikely (elf_getshdrstrndx (elf, &shstrndx) < 0))
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{
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elf_issue (N_("section header string table index"));
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return false;
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}
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Elf_Scn *scn = NULL;
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while (true)
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{
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scn = elf_nextscn (elf, scn);
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if (scn == NULL)
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Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
GElf_Shdr shdr_storage;
|
|
Packit Service |
97d2fb |
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_storage);
|
|
Packit Service |
97d2fb |
if (shdr == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_issue (N_("could not obtain section header"));
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
const char *section_name = elf_strptr (elf, shstrndx, shdr->sh_name);
|
|
Packit Service |
97d2fb |
if (section_name == NULL)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
elf_issue(N_("could not obtain section name"));
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
if (verbose > 2)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: section header %s (type %d) found\n",
|
|
Packit Service |
97d2fb |
section_name, shdr->sh_type);
|
|
Packit Service |
97d2fb |
if (shdr->sh_type == SHT_SYMTAB)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (verbose > 1)
|
|
Packit Service |
97d2fb |
fputs ("debug: symtab section found\n", stderr);
|
|
Packit Service |
97d2fb |
has_symtab = true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
/* NOBITS and NOTE sections can be in any file. We want to be
|
|
Packit Service |
97d2fb |
sure there is at least one other allocated section. */
|
|
Packit Service |
97d2fb |
if (shdr->sh_type != SHT_NOBITS
|
|
Packit Service |
97d2fb |
&& shdr->sh_type != SHT_NOTE
|
|
Packit Service |
97d2fb |
&& (shdr->sh_flags & SHF_ALLOC) != 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (verbose > 1 && !has_bits_alloc)
|
|
Packit Service |
97d2fb |
fputs ("debug: allocated (non-nobits/note) section found\n",
|
|
Packit Service |
97d2fb |
stderr);
|
|
Packit Service |
97d2fb |
has_bits_alloc = true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
const char *debug_prefix = ".debug_";
|
|
Packit Service |
97d2fb |
const char *zdebug_prefix = ".zdebug_";
|
|
Packit Service |
97d2fb |
if (strncmp (section_name, debug_prefix, strlen (debug_prefix)) == 0
|
|
Packit Service |
97d2fb |
|| strncmp (section_name, zdebug_prefix,
|
|
Packit Service |
97d2fb |
strlen (zdebug_prefix)) == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (verbose > 1 && !has_debug_sections)
|
|
Packit Service |
97d2fb |
fputs ("debug: .debug_* section found\n", stderr);
|
|
Packit Service |
97d2fb |
has_debug_sections = true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
if (strcmp (section_name, ".modinfo") == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (verbose > 1)
|
|
Packit Service |
97d2fb |
fputs ("debug: .modinfo section found\n", stderr);
|
|
Packit Service |
97d2fb |
has_modinfo = true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
if (strcmp (section_name, ".gnu.linkonce.this_module") == 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (verbose > 1)
|
|
Packit Service |
97d2fb |
fputs ("debug: .gnu.linkonce.this_module section found\n",
|
|
Packit Service |
97d2fb |
stderr);
|
|
Packit Service |
97d2fb |
has_gnu_linkonce_this_module = true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Examine the dynamic section. */
|
|
Packit Service |
97d2fb |
if (has_dynamic)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
Elf_Data *data = elf_getdata_rawchunk (elf, dyn_seg.p_offset,
|
|
Packit Service |
97d2fb |
dyn_seg.p_filesz,
|
|
Packit Service |
97d2fb |
ELF_T_DYN);
|
|
Packit Service |
97d2fb |
if (data != NULL)
|
|
Packit Service |
97d2fb |
for (int dyn_idx = 0; ; ++dyn_idx)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
GElf_Dyn dyn_storage;
|
|
Packit Service |
97d2fb |
GElf_Dyn *dyn = gelf_getdyn (data, dyn_idx, &dyn_storage);
|
|
Packit Service |
97d2fb |
if (dyn == NULL)
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
if (verbose > 2)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: dynamic entry %d"
|
|
Packit Service |
97d2fb |
" with tag %llu found\n",
|
|
Packit Service |
97d2fb |
dyn_idx, (unsigned long long int) dyn->d_tag);
|
|
Packit Service |
97d2fb |
if (dyn->d_tag == DT_SONAME)
|
|
Packit Service |
97d2fb |
has_soname = true;
|
|
Packit Service |
97d2fb |
if (dyn->d_tag == DT_FLAGS_1 && (dyn->d_un.d_val & DF_1_PIE))
|
|
Packit Service |
97d2fb |
has_pie_flag = true;
|
|
Packit Service |
97d2fb |
if (dyn->d_tag == DT_DEBUG)
|
|
Packit Service |
97d2fb |
has_dt_debug = true;
|
|
Packit Service |
97d2fb |
if (dyn->d_tag == DT_NULL)
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (verbose > 0)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: ELF type: %s (0x%x)\n", current_path,
|
|
Packit Service |
97d2fb |
elf_type_string (elf_type), elf_type);
|
|
Packit Service |
97d2fb |
if (has_program_load)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: PT_LOAD found\n", current_path);
|
|
Packit Service |
97d2fb |
if (has_sections)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: has sections\n", current_path);
|
|
Packit Service |
97d2fb |
if (has_bits_alloc)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: allocated (real) section found\n",
|
|
Packit Service |
97d2fb |
current_path);
|
|
Packit Service |
97d2fb |
if (has_program_interpreter)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: program interpreter found\n",
|
|
Packit Service |
97d2fb |
current_path);
|
|
Packit Service |
97d2fb |
if (has_dynamic)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: dynamic segment found\n", current_path);
|
|
Packit Service |
97d2fb |
if (has_soname)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: soname found\n", current_path);
|
|
Packit Service |
97d2fb |
if (has_pie_flag)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: DF_1_PIE flag found\n", current_path);
|
|
Packit Service |
97d2fb |
if (has_dt_debug)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: DT_DEBUG found\n", current_path);
|
|
Packit Service |
97d2fb |
if (has_symtab)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: symbol table found\n", current_path);
|
|
Packit Service |
97d2fb |
if (has_debug_sections)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: .debug_* section found\n", current_path);
|
|
Packit Service |
97d2fb |
if (has_modinfo)
|
|
Packit Service |
97d2fb |
fprintf (stderr, "info: %s: .modinfo section found\n", current_path);
|
|
Packit Service |
97d2fb |
if (has_gnu_linkonce_this_module)
|
|
Packit Service |
97d2fb |
fprintf (stderr,
|
|
Packit Service |
97d2fb |
"info: %s: .gnu.linkonce.this_module section found\n",
|
|
Packit Service |
97d2fb |
current_path);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_elf (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return elf_kind (elf) != ELF_K_NONE;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_elf_file (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return elf_kind (elf) == ELF_K_ELF;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_elf_archive (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return elf_kind (elf) == ELF_K_AR;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_core (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return elf_kind (elf) == ELF_K_ELF && elf_type == ET_CORE;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Return true if the file is a loadable object, which basically means
|
|
Packit Service |
97d2fb |
it is an ELF file, but not a relocatable object or a core dump
|
|
Packit Service |
97d2fb |
file. (The kernel and various userspace components can load ET_REL
|
|
Packit Service |
97d2fb |
files, but we disregard that for our classification purposes.) */
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_loadable (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return elf_kind (elf) == ELF_K_ELF
|
|
Packit Service |
97d2fb |
&& (elf_type == ET_EXEC || elf_type == ET_DYN)
|
|
Packit Service |
97d2fb |
&& has_program_load
|
|
Packit Service |
97d2fb |
&& (!has_sections || has_bits_alloc); /* It isn't debug-only. */
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Return true if the file is an ELF file which has a symbol table or
|
|
Packit Service |
97d2fb |
.debug_* sections (and thus can be stripped futher). */
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_unstripped (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return elf_kind (elf) != ELF_K_NONE
|
|
Packit Service |
97d2fb |
&& (elf_type == ET_REL || elf_type == ET_EXEC || elf_type == ET_DYN)
|
|
Packit Service |
97d2fb |
&& (has_symtab || has_debug_sections);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Return true if the file contains only debuginfo, but no loadable
|
|
Packit Service |
97d2fb |
program bits. Then it is most likely a separate .debug file, a dwz
|
|
Packit Service |
97d2fb |
multi-file or a .dwo file. Note that it can still be loadable,
|
|
Packit Service |
97d2fb |
but in that case the phdrs shouldn't be trusted. */
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_debug_only (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return elf_kind (elf) != ELF_K_NONE
|
|
Packit Service |
97d2fb |
&& (elf_type == ET_REL || elf_type == ET_EXEC || elf_type == ET_DYN)
|
|
Packit Service |
97d2fb |
&& (has_debug_sections || has_symtab)
|
|
Packit Service |
97d2fb |
&& !has_bits_alloc;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_shared (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (!is_loadable ())
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The ELF type is very clear: this is an executable. */
|
|
Packit Service |
97d2fb |
if (elf_type == ET_EXEC)
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If there is no dynamic section, the file cannot be loaded as a
|
|
Packit Service |
97d2fb |
shared object. */
|
|
Packit Service |
97d2fb |
if (!has_dynamic)
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If the object is marked as PIE, it is definitely an executable,
|
|
Packit Service |
97d2fb |
and not a loadlable shared object. */
|
|
Packit Service |
97d2fb |
if (has_pie_flag)
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Treat a DT_SONAME tag as a strong indicator that this is a shared
|
|
Packit Service |
97d2fb |
object. */
|
|
Packit Service |
97d2fb |
if (has_soname)
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* This is probably a PIE program: there is no soname, but a program
|
|
Packit Service |
97d2fb |
interpreter. In theory, this file could be also a DSO with a
|
|
Packit Service |
97d2fb |
soname implied by its file name that can be run as a program.
|
|
Packit Service |
97d2fb |
This situation is impossible to resolve in the general case. */
|
|
Packit Service |
97d2fb |
if (has_program_interpreter)
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Roland McGrath mentions in
|
|
Packit Service |
97d2fb |
<https://www.sourceware.org/ml/libc-alpha/2015-03/msg00605.html>,
|
|
Packit Service |
97d2fb |
that “we defined a PIE as an ET_DYN with a DT_DEBUG”. This
|
|
Packit Service |
97d2fb |
matches current binutils behavior (version 2.32). DT_DEBUG is
|
|
Packit Service |
97d2fb |
added if bfd_link_executable returns true or if bfd_link_pic
|
|
Packit Service |
97d2fb |
returns false, depending on the architectures. However, DT_DEBUG
|
|
Packit Service |
97d2fb |
is not documented as being specific to executables, therefore use
|
|
Packit Service |
97d2fb |
it only as a low-priority discriminator. */
|
|
Packit Service |
97d2fb |
if (has_dt_debug)
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_executable (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (!is_loadable ())
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* A loadable object which is not a shared object is treated as an
|
|
Packit Service |
97d2fb |
executable. */
|
|
Packit Service |
97d2fb |
return !is_shared ();
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Like is_executable, but the object can also be a shared library at
|
|
Packit Service |
97d2fb |
the same time. */
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_program (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (!is_loadable ())
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* The ELF type is very clear: this is an executable. */
|
|
Packit Service |
97d2fb |
if (elf_type == ET_EXEC)
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* If the object is marked as PIE, it is definitely an executable,
|
|
Packit Service |
97d2fb |
and not a loadlable shared object. */
|
|
Packit Service |
97d2fb |
if (has_pie_flag)
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* This is probably a PIE program. It isn't ET_EXEC, but has a
|
|
Packit Service |
97d2fb |
program interpreter. In theory, this file could be also a DSO
|
|
Packit Service |
97d2fb |
with a soname. This situation is impossible to resolve in the
|
|
Packit Service |
97d2fb |
general case. See is_shared. This is different from
|
|
Packit Service |
97d2fb |
is_executable. */
|
|
Packit Service |
97d2fb |
if (has_program_interpreter)
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Roland McGrath mentions in
|
|
Packit Service |
97d2fb |
<https://www.sourceware.org/ml/libc-alpha/2015-03/msg00605.html>,
|
|
Packit Service |
97d2fb |
that “we defined a PIE as an ET_DYN with a DT_DEBUG”. This
|
|
Packit Service |
97d2fb |
matches current binutils behavior (version 2.32). DT_DEBUG is
|
|
Packit Service |
97d2fb |
added if bfd_link_executable returns true or if bfd_link_pic
|
|
Packit Service |
97d2fb |
returns false, depending on the architectures. However, DT_DEBUG
|
|
Packit Service |
97d2fb |
is not documented as being specific to executables, therefore use
|
|
Packit Service |
97d2fb |
it only as a low-priority discriminator. */
|
|
Packit Service |
97d2fb |
if (has_dt_debug)
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Like is_shared but the library could also be an executable. */
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_library (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
/* Only ET_DYN can be shared libraries. */
|
|
Packit Service |
97d2fb |
if (elf_type != ET_DYN)
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (!is_loadable ())
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Without a PT_DYNAMIC segment the library cannot be loaded. */
|
|
Packit Service |
97d2fb |
if (!has_dynamic)
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* This really is a (PIE) executable. See is_shared. */
|
|
Packit Service |
97d2fb |
if (has_pie_flag || has_dt_debug)
|
|
Packit Service |
97d2fb |
return false;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* It could still (also) be a (PIE) executable, but most likely you
|
|
Packit Service |
97d2fb |
can dlopen it just fine. */
|
|
Packit Service |
97d2fb |
return true;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Returns true if the file is a linux kernel module (is ET_REL and
|
|
Packit Service |
97d2fb |
has the two magic sections .modinfo and .gnu.linkonce.this_module). */
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
is_linux_kernel_module (void)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return (elf_kind (elf) == ELF_K_ELF
|
|
Packit Service |
97d2fb |
&& elf_type == ET_REL
|
|
Packit Service |
97d2fb |
&& has_modinfo
|
|
Packit Service |
97d2fb |
&& has_gnu_linkonce_this_module);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
enum classify_requirement { do_not_care, required, forbidden };
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
enum classify_check
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
classify_elf,
|
|
Packit Service |
97d2fb |
classify_elf_file,
|
|
Packit Service |
97d2fb |
classify_elf_archive,
|
|
Packit Service |
97d2fb |
classify_core,
|
|
Packit Service |
97d2fb |
classify_unstripped,
|
|
Packit Service |
97d2fb |
classify_executable,
|
|
Packit Service |
97d2fb |
classify_program,
|
|
Packit Service |
97d2fb |
classify_shared,
|
|
Packit Service |
97d2fb |
classify_library,
|
|
Packit Service |
97d2fb |
classify_linux_kernel_module,
|
|
Packit Service |
97d2fb |
classify_debug_only,
|
|
Packit Service |
97d2fb |
classify_loadable,
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
classify_check_last = classify_loadable
|
|
Packit Service |
97d2fb |
};
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
enum
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
classify_check_offset = 1000,
|
|
Packit Service |
97d2fb |
classify_check_not_offset = 2000,
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
classify_flag_stdin = 3000,
|
|
Packit Service |
97d2fb |
classify_flag_stdin0,
|
|
Packit Service |
97d2fb |
classify_flag_no_stdin,
|
|
Packit Service |
97d2fb |
classify_flag_print,
|
|
Packit Service |
97d2fb |
classify_flag_print0,
|
|
Packit Service |
97d2fb |
classify_flag_no_print,
|
|
Packit Service |
97d2fb |
classify_flag_matching,
|
|
Packit Service |
97d2fb |
classify_flag_not_matching,
|
|
Packit Service |
97d2fb |
};
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
classify_check_positive (int key)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return key >= classify_check_offset
|
|
Packit Service |
97d2fb |
&& key <= classify_check_offset + classify_check_last;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static bool
|
|
Packit Service |
97d2fb |
classify_check_negative (int key)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
return key >= classify_check_not_offset
|
|
Packit Service |
97d2fb |
&& key <= classify_check_not_offset + classify_check_last;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Set by parse_opt. */
|
|
Packit Service |
97d2fb |
static enum classify_requirement requirements[classify_check_last + 1];
|
|
Packit Service |
97d2fb |
static enum { no_stdin, do_stdin, do_stdin0 } flag_stdin;
|
|
Packit Service |
97d2fb |
static enum { no_print, do_print, do_print0 } flag_print;
|
|
Packit Service |
97d2fb |
static bool flag_print_matching = true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
static error_t
|
|
Packit Service |
97d2fb |
parse_opt (int key, char *arg __attribute__ ((unused)),
|
|
Packit Service |
97d2fb |
struct argp_state *state __attribute__ ((unused)))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (classify_check_positive (key))
|
|
Packit Service |
97d2fb |
requirements[key - classify_check_offset] = required;
|
|
Packit Service |
97d2fb |
else if (classify_check_negative (key))
|
|
Packit Service |
97d2fb |
requirements[key - classify_check_not_offset] = forbidden;
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
switch (key)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
case 'v':
|
|
Packit Service |
97d2fb |
++verbose;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case 'q':
|
|
Packit Service |
97d2fb |
--verbose;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case 'z':
|
|
Packit Service |
97d2fb |
flag_compressed = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case 'f':
|
|
Packit Service |
97d2fb |
flag_only_regular_files = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case classify_flag_stdin:
|
|
Packit Service |
97d2fb |
flag_stdin = do_stdin;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case classify_flag_stdin0:
|
|
Packit Service |
97d2fb |
flag_stdin = do_stdin0;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case classify_flag_no_stdin:
|
|
Packit Service |
97d2fb |
flag_stdin = no_stdin;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case classify_flag_print:
|
|
Packit Service |
97d2fb |
flag_print = do_print;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case classify_flag_print0:
|
|
Packit Service |
97d2fb |
flag_print = do_print0;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case classify_flag_no_print:
|
|
Packit Service |
97d2fb |
flag_print = no_print;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case classify_flag_matching:
|
|
Packit Service |
97d2fb |
flag_print_matching = true;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
case classify_flag_not_matching:
|
|
Packit Service |
97d2fb |
flag_print_matching = false;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
default:
|
|
Packit Service |
97d2fb |
return ARGP_ERR_UNKNOWN;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return 0;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Perform requested checks against the file at current_path. If
|
|
Packit Service |
97d2fb |
necessary, sets *STATUS to 1 if checks failed. */
|
|
Packit Service |
97d2fb |
static void
|
|
Packit Service |
97d2fb |
process_current_path (int *status)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
bool checks_passed = true;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (open_elf () && run_classify ())
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
bool checks[] =
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
[classify_elf] = is_elf (),
|
|
Packit Service |
97d2fb |
[classify_elf_file] = is_elf_file (),
|
|
Packit Service |
97d2fb |
[classify_elf_archive] = is_elf_archive (),
|
|
Packit Service |
97d2fb |
[classify_core] = is_core (),
|
|
Packit Service |
97d2fb |
[classify_unstripped] = is_unstripped (),
|
|
Packit Service |
97d2fb |
[classify_executable] = is_executable (),
|
|
Packit Service |
97d2fb |
[classify_program] = is_program (),
|
|
Packit Service |
97d2fb |
[classify_shared] = is_shared (),
|
|
Packit Service |
97d2fb |
[classify_library] = is_library (),
|
|
Packit Service |
97d2fb |
[classify_linux_kernel_module] = is_linux_kernel_module (),
|
|
Packit Service |
97d2fb |
[classify_debug_only] = is_debug_only (),
|
|
Packit Service |
97d2fb |
[classify_loadable] = is_loadable (),
|
|
Packit Service |
97d2fb |
};
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
if (verbose > 1)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
if (checks[classify_elf])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: elf\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_elf_file])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: elf_file\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_elf_archive])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: elf_archive\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_core])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: core\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_unstripped])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: unstripped\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_executable])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: executable\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_program])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: program\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_shared])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: shared\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_library])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: library\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_linux_kernel_module])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: linux kernel module\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_debug_only])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: debug-only\n", current_path);
|
|
Packit Service |
97d2fb |
if (checks[classify_loadable])
|
|
Packit Service |
97d2fb |
fprintf (stderr, "debug: %s: loadable\n", current_path);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
for (enum classify_check check = 0;
|
|
Packit Service |
97d2fb |
check <= classify_check_last; ++check)
|
|
Packit Service |
97d2fb |
switch (requirements[check])
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
case required:
|
|
Packit Service |
97d2fb |
if (!checks[check])
|
|
Packit Service |
97d2fb |
checks_passed = false;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
case forbidden:
|
|
Packit Service |
97d2fb |
if (checks[check])
|
|
Packit Service |
97d2fb |
checks_passed = false;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
case do_not_care:
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
else if (file_fd == -1)
|
|
Packit Service |
97d2fb |
checks_passed = false; /* There is nothing to check, bad file. */
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
for (enum classify_check check = 0;
|
|
Packit Service |
97d2fb |
check <= classify_check_last; ++check)
|
|
Packit Service |
97d2fb |
if (requirements[check] == required)
|
|
Packit Service |
97d2fb |
checks_passed = false;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
close_elf ();
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
switch (flag_print)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
case do_print:
|
|
Packit Service |
97d2fb |
if (checks_passed == flag_print_matching)
|
|
Packit Service |
97d2fb |
puts (current_path);
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
case do_print0:
|
|
Packit Service |
97d2fb |
if (checks_passed == flag_print_matching)
|
|
Packit Service |
97d2fb |
if (fwrite (current_path, strlen (current_path) + 1, 1, stdout) < 1)
|
|
Packit Service |
97d2fb |
issue (errno, N_("writing to standard output"));
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
case no_print:
|
|
Packit Service |
97d2fb |
if (!checks_passed)
|
|
Packit Service |
97d2fb |
*status = 1;
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
/* Called to process standard input if flag_stdin is not no_stdin. */
|
|
Packit Service |
97d2fb |
static void
|
|
Packit Service |
97d2fb |
process_stdin (int *status)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
char delim;
|
|
Packit Service |
97d2fb |
if (flag_stdin == do_stdin0)
|
|
Packit Service |
97d2fb |
delim = '\0';
|
|
Packit Service |
97d2fb |
else
|
|
Packit Service |
97d2fb |
delim = '\n';
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
char *buffer = NULL;
|
|
Packit Service |
97d2fb |
size_t buffer_size = 0;
|
|
Packit Service |
97d2fb |
while (true)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
ssize_t ret = getdelim (&buffer, &buffer_size, delim, stdin);
|
|
Packit Service |
97d2fb |
if (ferror (stdin))
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
current_path = NULL;
|
|
Packit Service |
97d2fb |
issue (errno, N_("reading from standard input"));
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
if (feof (stdin))
|
|
Packit Service |
97d2fb |
break;
|
|
Packit Service |
97d2fb |
if (ret < 0)
|
|
Packit Service |
97d2fb |
abort (); /* Cannot happen due to error checks above. */
|
|
Packit Service |
97d2fb |
if (delim != '\0' && ret > 0 && buffer[ret - 1] == '\n')
|
|
Packit Service |
97d2fb |
buffer[ret - 1] = '\0';
|
|
Packit Service |
97d2fb |
current_path = buffer;
|
|
Packit Service |
97d2fb |
process_current_path (status);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
free (buffer);
|
|
Packit Service |
97d2fb |
}
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
int
|
|
Packit Service |
97d2fb |
main (int argc, char **argv)
|
|
Packit Service |
97d2fb |
{
|
|
Packit Service |
97d2fb |
const struct argp_option options[] =
|
|
Packit Service |
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{
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{ NULL, 0, NULL, OPTION_DOC, N_("Classification options"), 1 },
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{ "elf", classify_check_offset + classify_elf, NULL, 0,
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N_("File looks like an ELF object or archive/static library (default)")
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, 1 },
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{ "elf-file", classify_check_offset + classify_elf_file, NULL, 0,
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N_("File is an regular ELF object (not an archive/static library)")
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, 1 },
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{ "elf-archive", classify_check_offset + classify_elf_archive, NULL, 0,
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N_("File is an ELF archive or static library")
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, 1 },
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{ "core", classify_check_offset + classify_core, NULL, 0,
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N_("File is an ELF core dump file")
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, 1 },
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{ "unstripped", classify_check_offset + classify_unstripped, NULL, 0,
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N_("File is an ELF file with symbol table or .debug_* sections \
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and can be stripped further"), 1 },
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{ "executable", classify_check_offset + classify_executable, NULL, 0,
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N_("File is (primarily) an ELF program executable \
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(not primarily a DSO)"), 1 },
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{ "program", classify_check_offset + classify_program, NULL, 0,
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N_("File is an ELF program executable \
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(might also be a DSO)"), 1 },
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{ "shared", classify_check_offset + classify_shared, NULL, 0,
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N_("File is (primarily) an ELF shared object (DSO) \
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(not primarily an executable)"), 1 },
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{ "library", classify_check_offset + classify_library, NULL, 0,
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N_("File is an ELF shared object (DSO) \
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(might also be an executable)"), 1 },
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{ "linux-kernel-module", (classify_check_offset
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+ classify_linux_kernel_module), NULL, 0,
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N_("File is a linux kernel module"), 1 },
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{ "debug-only", (classify_check_offset + classify_debug_only), NULL, 0,
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N_("File is a debug only ELF file \
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(separate .debug, .dwo or dwz multi-file)"), 1 },
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{ "loadable", classify_check_offset + classify_loadable, NULL, 0,
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N_("File is a loadable ELF object (program or shared object)"), 1 },
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/* Negated versions of the above. */
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{ "not-elf", classify_check_not_offset + classify_elf,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-elf-file", classify_check_not_offset + classify_elf_file,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-elf-archive", classify_check_not_offset + classify_elf_archive,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-core", classify_check_not_offset + classify_core,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-unstripped", classify_check_not_offset + classify_unstripped,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-executable", classify_check_not_offset + classify_executable,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-program", classify_check_not_offset + classify_program,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-shared", classify_check_not_offset + classify_shared,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-library", classify_check_not_offset + classify_library,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-linux-kernel-module", (classify_check_not_offset
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+ classify_linux_kernel_module),
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-debug-only", (classify_check_not_offset + classify_debug_only),
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ "not-loadable", classify_check_not_offset + classify_loadable,
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NULL, OPTION_HIDDEN, NULL, 1 },
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{ NULL, 0, NULL, OPTION_DOC, N_("Input flags"), 2 },
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{ "file", 'f', NULL, 0,
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N_("Only classify regular (not symlink nor special device) files"), 2 },
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{ "stdin", classify_flag_stdin, NULL, 0,
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N_("Also read file names to process from standard input, \
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separated by newlines"), 2 },
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{ "stdin0", classify_flag_stdin0, NULL, 0,
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N_("Also read file names to process from standard input, \
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separated by ASCII NUL bytes"), 2 },
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{ "no-stdin", classify_flag_stdin, NULL, 0,
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N_("Do not read files from standard input (default)"), 2 },
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{ "compressed", 'z', NULL, 0,
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N_("Try to open compressed files or embedded (kernel) ELF images"),
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2 },
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{ NULL, 0, NULL, OPTION_DOC, N_("Output flags"), 3 },
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{ "print", classify_flag_print, NULL, 0,
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N_("Output names of files, separated by newline"), 3 },
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{ "print0", classify_flag_print0, NULL, 0,
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N_("Output names of files, separated by ASCII NUL"), 3 },
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{ "no-print", classify_flag_no_print, NULL, 0,
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N_("Do not output file names"), 3 },
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{ "matching", classify_flag_matching, NULL, 0,
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N_("If printing file names, print matching files (default)"), 3 },
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{ "not-matching", classify_flag_not_matching, NULL, 0,
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N_("If printing file names, print files that do not match"), 3 },
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{ NULL, 0, NULL, OPTION_DOC, N_("Additional flags"), 4 },
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{ "verbose", 'v', NULL, 0,
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N_("Output additional information (can be specified multiple times)"), 4 },
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{ "quiet", 'q', NULL, 0,
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N_("Suppress some error output (counterpart to --verbose)"), 4 },
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{ NULL, 0, NULL, 0, NULL, 0 }
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};
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97d2fb |
|
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const struct argp argp =
|
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{
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.options = options,
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.parser = parse_opt,
|
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.args_doc = N_("FILE..."),
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.doc = N_("\
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Determine the type of an ELF file.\
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\n\n\
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All of the classification options must apply at the same time to a \
|
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particular file. Classification options can be negated using a \
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\"--not-\" prefix.\
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\n\n\
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Since modern ELF does not clearly distinguish between programs and \
|
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dynamic shared objects, you should normally use either --executable or \
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--shared to identify the primary purpose of a file. \
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Only one of the --shared and --executable checks can pass for a file.\
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\n\n\
|
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97d2fb |
If you want to know whether an ELF object might a program or a \
|
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97d2fb |
shared library (but could be both), then use --program or --library. \
|
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97d2fb |
Some ELF files will classify as both a program and a library.\
|
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\n\n\
|
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97d2fb |
If you just want to know whether an ELF file is loadable (as program \
|
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97d2fb |
or library) use --loadable. Note that files that only contain \
|
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97d2fb |
(separate) debug information (--debug-only) are never --loadable (even \
|
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97d2fb |
though they might contain program headers). Linux kernel modules are \
|
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also not --loadable (in the normal sense).\
|
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\n\n\
|
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Without any of the --print options, the program exits with status 0 \
|
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if the requested checks pass for all input files, with 1 if a check \
|
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fails for any file, and 2 if there is an environmental issue (such \
|
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as a file read error or a memory allocation error).\
|
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\n\n\
|
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97d2fb |
When printing file names, the program exits with status 0 even if \
|
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97d2fb |
no file names are printed, and exits with status 2 if there is an \
|
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97d2fb |
environmental issue.\
|
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\n\n\
|
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97d2fb |
On usage error (e.g. a bad option was given), the program exits with \
|
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a status code larger than 2.\
|
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\n\n\
|
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97d2fb |
The --quiet or -q option suppresses some error warning output, but \
|
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doesn't change the exit status.\
|
|
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")
|
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};
|
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97d2fb |
|
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/* Require that the file is an ELF file by default. User can
|
|
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disable with --not-elf. */
|
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requirements[classify_elf] = required;
|
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97d2fb |
|
|
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int remaining;
|
|
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97d2fb |
if (argp_parse (&argp, argc, argv, 0, &remaining, NULL) != 0)
|
|
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97d2fb |
return 2;
|
|
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97d2fb |
|
|
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97d2fb |
elf_version (EV_CURRENT);
|
|
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97d2fb |
|
|
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97d2fb |
int status = 0;
|
|
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97d2fb |
|
|
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97d2fb |
for (int i = remaining; i < argc; ++i)
|
|
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97d2fb |
{
|
|
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97d2fb |
current_path = argv[i];
|
|
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97d2fb |
process_current_path (&status);
|
|
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97d2fb |
}
|
|
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97d2fb |
|
|
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97d2fb |
if (flag_stdin != no_stdin)
|
|
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97d2fb |
process_stdin (&status);
|
|
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97d2fb |
|
|
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97d2fb |
if (issue_found)
|
|
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97d2fb |
return 2;
|
|
Packit Service |
97d2fb |
|
|
Packit Service |
97d2fb |
return status;
|
|
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97d2fb |
}
|