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/* Operating system support for run-time dynamic linker. Generic Unix version.
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Copyright (C) 1995-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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6c4009 |
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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6c4009 |
License as published by the Free Software Foundation; either
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6c4009 |
version 2.1 of the License, or (at your option) any later version.
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6c4009 |
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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6c4009 |
Lesser General Public License for more details.
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6c4009 |
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You should have received a copy of the GNU Lesser General Public
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6c4009 |
License along with the GNU C Library; if not, see
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6c4009 |
<http://www.gnu.org/licenses/>. */
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6c4009 |
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/* We conditionalize the whole of this file rather than simply eliding it
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from the static build, because other sysdeps/ versions of this file
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might define things needed by a static build. */
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#ifdef SHARED
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#include <assert.h>
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6c4009 |
#include <elf.h>
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6c4009 |
#include <errno.h>
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6c4009 |
#include <fcntl.h>
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#include <libintl.h>
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#include <stdlib.h>
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#include <string.h>
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6c4009 |
#include <unistd.h>
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6c4009 |
#include <sys/types.h>
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#include <sys/stat.h>
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6c4009 |
#include <sys/mman.h>
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#include <ldsodefs.h>
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#include <_itoa.h>
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#include <fpu_control.h>
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6c4009 |
#include <entry.h>
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6c4009 |
#include <dl-machine.h>
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#include <dl-procinfo.h>
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#include <dl-osinfo.h>
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#include <libc-internal.h>
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#include <tls.h>
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#include <dl-tunables.h>
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extern char **_environ attribute_hidden;
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extern char _end[] attribute_hidden;
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/* Protect SUID program against misuse of file descriptors. */
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extern void __libc_check_standard_fds (void);
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#ifdef NEED_DL_BASE_ADDR
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ElfW(Addr) _dl_base_addr;
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#endif
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int __libc_enable_secure attribute_relro = 0;
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rtld_hidden_data_def (__libc_enable_secure)
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int __libc_multiple_libcs = 0; /* Defining this here avoids the inclusion
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of init-first. */
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/* This variable contains the lowest stack address ever used. */
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void *__libc_stack_end attribute_relro = NULL;
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rtld_hidden_data_def(__libc_stack_end)
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void *_dl_random attribute_relro = NULL;
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#ifndef DL_FIND_ARG_COMPONENTS
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# define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \
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do { \
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void **_tmp; \
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(argc) = *(long int *) cookie; \
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(argv) = (char **) ((long int *) cookie + 1); \
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(envp) = (argv) + (argc) + 1; \
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for (_tmp = (void **) (envp); *_tmp; ++_tmp) \
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continue; \
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(auxp) = (void *) ++_tmp; \
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} while (0)
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#endif
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#ifndef DL_STACK_END
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# define DL_STACK_END(cookie) ((void *) (cookie))
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#endif
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ElfW(Addr)
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_dl_sysdep_start (void **start_argptr,
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void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum,
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ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv))
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{
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const ElfW(Phdr) *phdr = NULL;
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ElfW(Word) phnum = 0;
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ElfW(Addr) user_entry;
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ElfW(auxv_t) *av;
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#ifdef HAVE_AUX_SECURE
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# define set_seen(tag) (tag) /* Evaluate for the side effects. */
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# define set_seen_secure() ((void) 0)
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#else
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uid_t uid = 0;
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gid_t gid = 0;
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unsigned int seen = 0;
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# define set_seen_secure() (seen = -1)
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# ifdef HAVE_AUX_XID
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# define set_seen(tag) (tag) /* Evaluate for the side effects. */
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# else
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# define M(type) (1 << (type))
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# define set_seen(tag) seen |= M ((tag)->a_type)
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# endif
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#endif
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#ifdef NEED_DL_SYSINFO
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uintptr_t new_sysinfo = 0;
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#endif
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__libc_stack_end = DL_STACK_END (start_argptr);
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DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, _dl_argv, _environ,
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GLRO(dl_auxv));
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user_entry = (ElfW(Addr)) ENTRY_POINT;
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GLRO(dl_platform) = NULL; /* Default to nothing known about the platform. */
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for (av = GLRO(dl_auxv); av->a_type != AT_NULL; set_seen (av++))
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switch (av->a_type)
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{
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case AT_PHDR:
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phdr = (void *) av->a_un.a_val;
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break;
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case AT_PHNUM:
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phnum = av->a_un.a_val;
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break;
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case AT_PAGESZ:
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GLRO(dl_pagesize) = av->a_un.a_val;
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break;
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case AT_ENTRY:
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user_entry = av->a_un.a_val;
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break;
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#ifdef NEED_DL_BASE_ADDR
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case AT_BASE:
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_dl_base_addr = av->a_un.a_val;
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break;
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#endif
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#ifndef HAVE_AUX_SECURE
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case AT_UID:
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case AT_EUID:
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uid ^= av->a_un.a_val;
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break;
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case AT_GID:
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case AT_EGID:
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gid ^= av->a_un.a_val;
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break;
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#endif
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case AT_SECURE:
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#ifndef HAVE_AUX_SECURE
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seen = -1;
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#endif
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__libc_enable_secure = av->a_un.a_val;
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break;
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case AT_PLATFORM:
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GLRO(dl_platform) = (void *) av->a_un.a_val;
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break;
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case AT_HWCAP:
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GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
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break;
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case AT_HWCAP2:
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GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val;
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break;
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case AT_CLKTCK:
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GLRO(dl_clktck) = av->a_un.a_val;
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break;
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case AT_FPUCW:
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GLRO(dl_fpu_control) = av->a_un.a_val;
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break;
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#ifdef NEED_DL_SYSINFO
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6c4009 |
case AT_SYSINFO:
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new_sysinfo = av->a_un.a_val;
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6c4009 |
break;
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#endif
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#ifdef NEED_DL_SYSINFO_DSO
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case AT_SYSINFO_EHDR:
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GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val;
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break;
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#endif
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case AT_RANDOM:
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_dl_random = (void *) av->a_un.a_val;
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break;
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6c4009 |
#ifdef DL_PLATFORM_AUXV
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DL_PLATFORM_AUXV
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#endif
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}
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6c4009 |
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6c4009 |
#ifndef HAVE_AUX_SECURE
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6c4009 |
if (seen != -1)
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{
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6c4009 |
/* Fill in the values we have not gotten from the kernel through the
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6c4009 |
auxiliary vector. */
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6c4009 |
# ifndef HAVE_AUX_XID
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6c4009 |
# define SEE(UID, var, uid) \
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6c4009 |
if ((seen & M (AT_##UID)) == 0) var ^= __get##uid ()
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SEE (UID, uid, uid);
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6c4009 |
SEE (EUID, uid, euid);
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6c4009 |
SEE (GID, gid, gid);
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6c4009 |
SEE (EGID, gid, egid);
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6c4009 |
# endif
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6c4009 |
|
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6c4009 |
/* If one of the two pairs of IDs does not match this is a setuid
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6c4009 |
or setgid run. */
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6c4009 |
__libc_enable_secure = uid | gid;
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6c4009 |
}
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6c4009 |
#endif
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6c4009 |
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#ifndef HAVE_AUX_PAGESIZE
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if (GLRO(dl_pagesize) == 0)
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GLRO(dl_pagesize) = __getpagesize ();
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#endif
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6c4009 |
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#ifdef NEED_DL_SYSINFO
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if (new_sysinfo != 0)
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{
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6c4009 |
# ifdef NEED_DL_SYSINFO_DSO
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6c4009 |
/* Only set the sysinfo value if we also have the vsyscall DSO. */
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6c4009 |
if (GLRO(dl_sysinfo_dso) != 0)
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6c4009 |
# endif
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GLRO(dl_sysinfo) = new_sysinfo;
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6c4009 |
}
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6c4009 |
#endif
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6c4009 |
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6c4009 |
__tunables_init (_environ);
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6c4009 |
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6c4009 |
#ifdef DL_SYSDEP_INIT
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6c4009 |
DL_SYSDEP_INIT;
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6c4009 |
#endif
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6c4009 |
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6c4009 |
#ifdef DL_PLATFORM_INIT
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6c4009 |
DL_PLATFORM_INIT;
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6c4009 |
#endif
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6c4009 |
|
|
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6c4009 |
/* Determine the length of the platform name. */
|
|
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6c4009 |
if (GLRO(dl_platform) != NULL)
|
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6c4009 |
GLRO(dl_platformlen) = strlen (GLRO(dl_platform));
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|
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6c4009 |
|
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6c4009 |
if (__sbrk (0) == _end)
|
|
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6c4009 |
/* The dynamic linker was run as a program, and so the initial break
|
|
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6c4009 |
starts just after our bss, at &_end. The malloc in dl-minimal.c
|
|
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6c4009 |
will consume the rest of this page, so tell the kernel to move the
|
|
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6c4009 |
break up that far. When the user program examines its break, it
|
|
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6c4009 |
will see this new value and not clobber our data. */
|
|
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6c4009 |
__sbrk (GLRO(dl_pagesize)
|
|
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6c4009 |
- ((_end - (char *) 0) & (GLRO(dl_pagesize) - 1)));
|
|
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6c4009 |
|
|
Packit |
6c4009 |
/* If this is a SUID program we make sure that FDs 0, 1, and 2 are
|
|
Packit |
6c4009 |
allocated. If necessary we are doing it ourself. If it is not
|
|
Packit |
6c4009 |
possible we stop the program. */
|
|
Packit |
6c4009 |
if (__builtin_expect (__libc_enable_secure, 0))
|
|
Packit |
6c4009 |
__libc_check_standard_fds ();
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
(*dl_main) (phdr, phnum, &user_entry, GLRO(dl_auxv));
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|
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6c4009 |
return user_entry;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
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6c4009 |
void
|
|
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6c4009 |
_dl_sysdep_start_cleanup (void)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
void
|
|
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6c4009 |
_dl_show_auxv (void)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
char buf[64];
|
|
Packit |
6c4009 |
ElfW(auxv_t) *av;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Terminate string. */
|
|
Packit |
6c4009 |
buf[63] = '\0';
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* The following code assumes that the AT_* values are encoded
|
|
Packit |
6c4009 |
starting from 0 with AT_NULL, 1 for AT_IGNORE, and all other values
|
|
Packit |
6c4009 |
close by (otherwise the array will be too large). In case we have
|
|
Packit |
6c4009 |
to support a platform where these requirements are not fulfilled
|
|
Packit |
6c4009 |
some alternative implementation has to be used. */
|
|
Packit |
6c4009 |
for (av = GLRO(dl_auxv); av->a_type != AT_NULL; ++av)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
static const struct
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
const char label[17];
|
|
Packit |
6c4009 |
enum { unknown = 0, dec, hex, str, ignore } form : 8;
|
|
Packit |
6c4009 |
} auxvars[] =
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
[AT_EXECFD - 2] = { "EXECFD: ", dec },
|
|
Packit |
6c4009 |
[AT_EXECFN - 2] = { "EXECFN: ", str },
|
|
Packit |
6c4009 |
[AT_PHDR - 2] = { "PHDR: 0x", hex },
|
|
Packit |
6c4009 |
[AT_PHENT - 2] = { "PHENT: ", dec },
|
|
Packit |
6c4009 |
[AT_PHNUM - 2] = { "PHNUM: ", dec },
|
|
Packit |
6c4009 |
[AT_PAGESZ - 2] = { "PAGESZ: ", dec },
|
|
Packit |
6c4009 |
[AT_BASE - 2] = { "BASE: 0x", hex },
|
|
Packit |
6c4009 |
[AT_FLAGS - 2] = { "FLAGS: 0x", hex },
|
|
Packit |
6c4009 |
[AT_ENTRY - 2] = { "ENTRY: 0x", hex },
|
|
Packit |
6c4009 |
[AT_NOTELF - 2] = { "NOTELF: ", hex },
|
|
Packit |
6c4009 |
[AT_UID - 2] = { "UID: ", dec },
|
|
Packit |
6c4009 |
[AT_EUID - 2] = { "EUID: ", dec },
|
|
Packit |
6c4009 |
[AT_GID - 2] = { "GID: ", dec },
|
|
Packit |
6c4009 |
[AT_EGID - 2] = { "EGID: ", dec },
|
|
Packit |
6c4009 |
[AT_PLATFORM - 2] = { "PLATFORM: ", str },
|
|
Packit |
6c4009 |
[AT_HWCAP - 2] = { "HWCAP: ", hex },
|
|
Packit |
6c4009 |
[AT_CLKTCK - 2] = { "CLKTCK: ", dec },
|
|
Packit |
6c4009 |
[AT_FPUCW - 2] = { "FPUCW: ", hex },
|
|
Packit |
6c4009 |
[AT_DCACHEBSIZE - 2] = { "DCACHEBSIZE: 0x", hex },
|
|
Packit |
6c4009 |
[AT_ICACHEBSIZE - 2] = { "ICACHEBSIZE: 0x", hex },
|
|
Packit |
6c4009 |
[AT_UCACHEBSIZE - 2] = { "UCACHEBSIZE: 0x", hex },
|
|
Packit |
6c4009 |
[AT_IGNOREPPC - 2] = { "IGNOREPPC", ignore },
|
|
Packit |
6c4009 |
[AT_SECURE - 2] = { "SECURE: ", dec },
|
|
Packit |
6c4009 |
[AT_BASE_PLATFORM - 2] = { "BASE_PLATFORM:", str },
|
|
Packit |
6c4009 |
[AT_SYSINFO - 2] = { "SYSINFO: 0x", hex },
|
|
Packit |
6c4009 |
[AT_SYSINFO_EHDR - 2] = { "SYSINFO_EHDR: 0x", hex },
|
|
Packit |
6c4009 |
[AT_RANDOM - 2] = { "RANDOM: 0x", hex },
|
|
Packit |
6c4009 |
[AT_HWCAP2 - 2] = { "HWCAP2: 0x", hex },
|
|
Packit |
6c4009 |
};
|
|
Packit |
6c4009 |
unsigned int idx = (unsigned int) (av->a_type - 2);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if ((unsigned int) av->a_type < 2u
|
|
Packit |
6c4009 |
|| (idx < sizeof (auxvars) / sizeof (auxvars[0])
|
|
Packit |
6c4009 |
&& auxvars[idx].form == ignore))
|
|
Packit |
6c4009 |
continue;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
assert (AT_NULL == 0);
|
|
Packit |
6c4009 |
assert (AT_IGNORE == 1);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (av->a_type == AT_HWCAP || av->a_type == AT_HWCAP2)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* These are handled in a special way per platform. */
|
|
Packit |
6c4009 |
if (_dl_procinfo (av->a_type, av->a_un.a_val) == 0)
|
|
Packit |
6c4009 |
continue;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (idx < sizeof (auxvars) / sizeof (auxvars[0])
|
|
Packit |
6c4009 |
&& auxvars[idx].form != unknown)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
const char *val = (char *) av->a_un.a_val;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (__builtin_expect (auxvars[idx].form, dec) == dec)
|
|
Packit |
6c4009 |
val = _itoa ((unsigned long int) av->a_un.a_val,
|
|
Packit |
6c4009 |
buf + sizeof buf - 1, 10, 0);
|
|
Packit |
6c4009 |
else if (__builtin_expect (auxvars[idx].form, hex) == hex)
|
|
Packit |
6c4009 |
val = _itoa ((unsigned long int) av->a_un.a_val,
|
|
Packit |
6c4009 |
buf + sizeof buf - 1, 16, 0);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
_dl_printf ("AT_%s%s\n", auxvars[idx].label, val);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
continue;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Unknown value: print a generic line. */
|
|
Packit |
6c4009 |
char buf2[17];
|
|
Packit |
6c4009 |
buf2[sizeof (buf2) - 1] = '\0';
|
|
Packit |
6c4009 |
const char *val2 = _itoa ((unsigned long int) av->a_un.a_val,
|
|
Packit |
6c4009 |
buf2 + sizeof buf2 - 1, 16, 0);
|
|
Packit |
6c4009 |
const char *val = _itoa ((unsigned long int) av->a_type,
|
|
Packit |
6c4009 |
buf + sizeof buf - 1, 16, 0);
|
|
Packit |
6c4009 |
_dl_printf ("AT_??? (0x%s): 0x%s\n", val, val2);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#endif
|