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35f1e82763
* configure.in: Add --enable-stackguard-randomization option.
(ENABLE_STACKGUARD_RANDOMIZE): New define.
* config.h.in (ENABLE_STACKGUARD_RANDOMIZE): Add.
* sysdeps/unix/sysv/linux/dl-osinfo.h: Include stdint.h.
(_dl_setup_stack_chk_guard): New inline function.
* sysdeps/generic/dl-osinfo.h: Include stdint.h.
(_dl_setup_stack_chk_guard): New inline function.
* elf/rtld.c (__stack_chk_guard): New variable.
(dl_main): Remove all traces of TLS_INIT_TP_EXPENSIVE.
Set __stack_chk_guard to _dl_setup_stack_chk_guard (),
use THREAD_SET_STACK_GUARD if defined.
* elf/Versions (ld): Export __stack_chk_guard@@GLIBC_2.4.
* sysdeps/generic/libc-start.c (__stack_chk_guard): New variable.
(__libc_start_main): Set __stack_chk_guard to
_dl_setup_stack_chk_guard (), use THREAD_SET_STACK_GUARD if defined.
* sysdeps/generic/libc-tls.c (__libc_setup_tls): Remove all
traces of TLS_INIT_TP_EXPENSIVE.
* debug/Versions (libc): Export __stack_chk_fail@@GLIBC_2.4.
* debug/Makefile (routines): Add stack_chk_fail.
(static-only-routines): Add stack_chk_fail_local.
* debug/stack_chk_fail_local.c: New file.
* debug/stack_chk_fail.c: New file.
* elf/Makefile: Add rules to build and run tst-stackguard1{,-static}
tests.
* elf/tst-stackguard1.c: New file.
* elf/tst-stackguard1-static.c: New file.
* elf/stackguard-macros.h: New file.
276 lines
8.0 KiB
C
276 lines
8.0 KiB
C
/* Copyright (C) 1998-2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <bp-start.h>
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#include <bp-sym.h>
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extern void __libc_init_first (int argc, char **argv, char **envp);
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extern int __libc_multiple_libcs;
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#include <tls.h>
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#ifndef SHARED
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# include <dl-osinfo.h>
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extern void __pthread_initialize_minimal (void)
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# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP
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__attribute__ ((weak))
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# endif
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;
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# ifndef THREAD_SET_STACK_GUARD
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/* Only exported for architectures that don't store the stack guard canary
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in thread local area. */
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uintptr_t __stack_chk_guard attribute_relro;
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# endif
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#endif
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#ifdef HAVE_PTR_NTHREADS
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/* We need atomic operations. */
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# include <atomic.h>
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#endif
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#ifdef LIBC_START_MAIN
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# ifdef LIBC_START_DISABLE_INLINE
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# define STATIC static
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# else
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# define STATIC static inline __attribute__ ((always_inline))
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# endif
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#else
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# define STATIC
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# define LIBC_START_MAIN BP_SYM (__libc_start_main)
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#endif
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#ifdef MAIN_AUXVEC_ARG
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/* main gets passed a pointer to the auxiliary. */
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# define MAIN_AUXVEC_DECL , void *
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# define MAIN_AUXVEC_PARAM , auxvec
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#else
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# define MAIN_AUXVEC_DECL
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# define MAIN_AUXVEC_PARAM
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#endif
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STATIC int LIBC_START_MAIN (int (*main) (int, char **, char **
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MAIN_AUXVEC_DECL),
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int argc,
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char *__unbounded *__unbounded ubp_av,
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#ifdef LIBC_START_MAIN_AUXVEC_ARG
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ElfW(auxv_t) *__unbounded auxvec,
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#endif
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#ifdef INIT_MAIN_ARGS
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__typeof (main) init,
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#else
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void (*init) (void),
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#endif
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void (*fini) (void),
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void (*rtld_fini) (void),
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void *__unbounded stack_end)
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__attribute__ ((noreturn));
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/* Note: the fini parameter is ignored here for shared library. It
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is registered with __cxa_atexit. This had the disadvantage that
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finalizers were called in more than one place. */
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STATIC int
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LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
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int argc, char *__unbounded *__unbounded ubp_av,
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#ifdef LIBC_START_MAIN_AUXVEC_ARG
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ElfW(auxv_t) *__unbounded auxvec,
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#endif
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#ifdef INIT_MAIN_ARGS
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__typeof (main) init,
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#else
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void (*init) (void),
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#endif
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void (*fini) (void),
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void (*rtld_fini) (void), void *__unbounded stack_end)
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{
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#if __BOUNDED_POINTERS__
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char **argv;
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#else
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# define argv ubp_av
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#endif
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/* Result of the 'main' function. */
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int result;
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__libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
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#ifndef SHARED
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char *__unbounded *__unbounded ubp_ev = &ubp_av[argc + 1];
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INIT_ARGV_and_ENVIRON;
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/* Store the lowest stack address. This is done in ld.so if this is
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the code for the DSO. */
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__libc_stack_end = stack_end;
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# ifdef HAVE_AUX_VECTOR
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/* First process the auxiliary vector since we need to find the
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program header to locate an eventually present PT_TLS entry. */
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# ifndef LIBC_START_MAIN_AUXVEC_ARG
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ElfW(auxv_t) *__unbounded auxvec;
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{
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char *__unbounded *__unbounded evp = ubp_ev;
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while (*evp++ != NULL)
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;
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auxvec = (ElfW(auxv_t) *__unbounded) evp;
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}
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# endif
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_dl_aux_init (auxvec);
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# endif
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# ifdef DL_SYSDEP_OSCHECK
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if (!__libc_multiple_libcs)
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{
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/* This needs to run to initiliaze _dl_osversion before TLS
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setup might check it. */
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DL_SYSDEP_OSCHECK (__libc_fatal);
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}
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# endif
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/* Initialize the thread library at least a bit since the libgcc
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functions are using thread functions if these are available and
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we need to setup errno. If there is no thread library and we
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handle TLS the function is defined in the libc to initialized the
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TLS handling. */
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# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP
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if (__pthread_initialize_minimal)
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# endif
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__pthread_initialize_minimal ();
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#endif
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# ifndef SHARED
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/* Set up the stack checker's canary. */
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uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard ();
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# ifdef THREAD_SET_STACK_GUARD
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THREAD_SET_STACK_GUARD (stack_chk_guard);
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# else
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__stack_chk_guard = stack_chk_guard;
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# endif
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#endif
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/* Register the destructor of the dynamic linker if there is any. */
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if (__builtin_expect (rtld_fini != NULL, 1))
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__cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);
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#ifndef SHARED
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/* Call the initializer of the libc. This is only needed here if we
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are compiling for the static library in which case we haven't
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run the constructors in `_dl_start_user'. */
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__libc_init_first (argc, argv, __environ);
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/* Register the destructor of the program, if any. */
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if (fini)
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__cxa_atexit ((void (*) (void *)) fini, NULL, NULL);
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/* Some security at this point. Prevent starting a SUID binary where
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the standard file descriptors are not opened. We have to do this
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only for statically linked applications since otherwise the dynamic
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loader did the work already. */
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if (__builtin_expect (__libc_enable_secure, 0))
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__libc_check_standard_fds ();
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#endif
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/* Call the initializer of the program, if any. */
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#ifdef SHARED
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if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
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GLRO(dl_debug_printf) ("\ninitialize program: %s\n\n", argv[0]);
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#endif
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if (init)
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(*init) (
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#ifdef INIT_MAIN_ARGS
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argc, argv, __environ MAIN_AUXVEC_PARAM
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#endif
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);
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#ifdef SHARED
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/* Auditing checkpoint: we have a new object. */
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if (__builtin_expect (GLRO(dl_naudit) > 0, 0))
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{
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struct audit_ifaces *afct = GLRO(dl_audit);
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struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->preinit != NULL)
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afct->preinit (&head->l_audit[cnt].cookie);
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afct = afct->next;
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}
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}
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#endif
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#ifdef SHARED
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if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
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GLRO(dl_debug_printf) ("\ntransferring control: %s\n\n", argv[0]);
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#endif
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#ifdef HAVE_CLEANUP_JMP_BUF
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/* Memory for the cancellation buffer. */
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struct pthread_unwind_buf unwind_buf;
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int not_first_call;
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not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf);
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if (__builtin_expect (! not_first_call, 1))
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{
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struct pthread *self = THREAD_SELF;
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/* Store old info. */
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unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
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unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup);
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/* Store the new cleanup handler info. */
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THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf);
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/* Run the program. */
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result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
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}
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else
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{
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/* Remove the thread-local data. */
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# ifdef SHARED
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__libc_pthread_functions.ptr__nptl_deallocate_tsd ();
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# else
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extern void __nptl_deallocate_tsd (void) __attribute ((weak));
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__nptl_deallocate_tsd ();
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# endif
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/* One less thread. Decrement the counter. If it is zero we
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terminate the entire process. */
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result = 0;
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# ifdef SHARED
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unsigned int *const ptr = __libc_pthread_functions.ptr_nthreads;
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# else
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extern unsigned int __nptl_nthreads __attribute ((weak));
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unsigned int *const ptr = &__nptl_nthreads;
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# endif
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if (! atomic_decrement_and_test (ptr))
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/* Not much left to do but to exit the thread, not the process. */
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__exit_thread (0);
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}
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#else
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/* Nothing fancy, just call the function. */
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result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
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#endif
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exit (result);
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}
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