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* Versions.def (ld): Add GLIBC_2.4. 

* 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.
This commit is contained in:
Ulrich Drepper 2005-06-26 18:14:26 +00:00
parent 2f37117b01
commit 35f1e82763
28 changed files with 738 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
ChangeLog
View File

@ -1,3 +1,34 @@
2005-06-25 Jakub Jelinek <jakub@redhat.com>
* Versions.def (ld): Add GLIBC_2.4.
* 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.
2005-06-21 Ulrich Drepper <drepper@redhat.com>
* resource/Makefile (tests): Add tst-getrlimit.

1
Versions.def
View File

@ -102,6 +102,7 @@ ld {
GLIBC_2.0
GLIBC_2.1
GLIBC_2.3
GLIBC_2.4
GLIBC_PRIVATE
}
libthread_db {

3
config.h.in
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@ -223,6 +223,9 @@
/* Define if your assembler and linker support R_PPC_REL16* relocs. */
#undef HAVE_ASM_PPC_REL16
/* Define if __stack_chk_guard canary should be randomized at program startup. */
#undef ENABLE_STACKGUARD_RANDOMIZE
/*
*/

17
configure vendored
View File

@ -873,6 +873,9 @@ Optional Features:
objects [default=yes if supported]
--enable-oldest-abi=ABI configure the oldest ABI supported [e.g. 2.2]
[default=glibc default]
--enable-stackguard-randomization
initialize __stack_chk_guard canary with a random
number at program start
--enable-add-ons[=DIRS...]
configure and build add-ons in DIR1,DIR2,... search
for add-ons if no parameter given
@ -1597,6 +1600,20 @@ _ACEOF
fi
# Check whether --enable-stackguard-randomization or --disable-stackguard-randomization was given.
if test "${enable_stackguard_randomization+set}" = set; then
enableval="$enable_stackguard_randomization"
enable_stackguard_randomize=$enableval
else
enable_stackguard_randomize=no
fi;
if test "$enable_stackguard_randomize" = yes; then
cat >>confdefs.h <<\_ACEOF
#define ENABLE_STACKGUARD_RANDOMIZE 1
_ACEOF
fi
# Check whether --enable-add-ons or --disable-add-ons was given.
if test "${enable_add_ons+set}" = set; then
enableval="$enable_add_ons"

9
configure.in
View File

@ -174,6 +174,15 @@ else
fi
AC_SUBST(oldest_abi)
AC_ARG_ENABLE([stackguard-randomization],
AC_HELP_STRING([--enable-stackguard-randomization],
[initialize __stack_chk_guard canary with a random number at program start]),
[enable_stackguard_randomize=$enableval],
[enable_stackguard_randomize=no])
if test "$enable_stackguard_randomize" = yes; then
AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
fi
dnl Generic infrastructure for drop-in additions to libc.
AC_ARG_ENABLE([add-ons],
AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],

4
debug/Makefile
View File

@ -31,9 +31,9 @@ routines = backtrace backtracesyms backtracesymsfd noophooks \
printf_chk fprintf_chk vprintf_chk vfprintf_chk \
gets_chk chk_fail readonly-area fgets_chk fgets_u_chk \
read_chk pread_chk pread64_chk recv_chk recvfrom_chk \
readlink_chk getwd_chk getcwd_chk \
readlink_chk getwd_chk getcwd_chk stack_chk_fail \
$(static-only-routines)
static-only-routines := warning-nop
static-only-routines := warning-nop stack_chk_fail_local
CFLAGS-backtrace.c = -fno-omit-frame-pointer
CFLAGS-sprintf_chk.c = -D_IO_MTSAFE_IO

2
debug/Versions
View File

@ -23,5 +23,7 @@ libc {
__read_chk; __pread_chk; __pread64_chk;
__readlink_chk; __getcwd_chk; __getwd_chk;
__recv_chk; __recvfrom_chk;
__stack_chk_fail;
}
}

33
debug/stack_chk_fail.c Normal file
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@ -0,0 +1,33 @@
/* Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdio.h>
#include <stdlib.h>
extern char **__libc_argv attribute_hidden;
void
__attribute__ ((noreturn))
__stack_chk_fail (void)
{
/* The loop is added only to keep gcc happy. */
while (1)
__libc_message (1, "*** stack smashing detected ***: %s terminated\n",
__libc_argv[0] ?: "<unknown>");
}

30
debug/stack_chk_fail_local.c Normal file
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@ -0,0 +1,30 @@
/* Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sys/cdefs.h>
extern void __stack_chk_fail (void) __attribute__ ((noreturn));
/* On some architectures, this helps needless PIC pointer setup
that would be needed just for the __stack_chk_fail call. */
void __attribute__ ((noreturn)) attribute_hidden
__stack_chk_fail_local (void)
{
__stack_chk_fail ();
}

11
elf/Makefile
View File

@ -87,7 +87,8 @@ distribute := rtld-Rules \
unload3mod1.c unload3mod2.c unload3mod3.c unload3mod4.c \
unload4mod1.c unload4mod2.c unload4mod3.c unload4mod4.c \
unload6mod1.c unload6mod2.c unload6mod3.c tst-auditmod1.c \
order2mod1.c order2mod2.c order2mod3.c order2mod4.c
order2mod1.c order2mod2.c order2mod3.c order2mod4.c \
tst-stackguard1.c tst-stackguard1-static.c
CFLAGS-dl-runtime.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-dl-lookup.c = -fexceptions -fasynchronous-unwind-tables
@ -140,7 +141,7 @@ ifeq (yes,$(have-initfini-array))
tests += tst-array1 tst-array2 tst-array3 tst-array4
endif
ifeq (yes,$(build-static))
tests-static = tst-tls1-static tst-tls2-static
tests-static = tst-tls1-static tst-tls2-static tst-stackguard1-static
ifeq (yesyesyes,$(build-static)$(build-shared)$(elf))
tests-static += tst-tls9-static
tst-tls9-static-ENV = \
@ -162,7 +163,8 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
tst-tls10 tst-tls11 tst-tls12 tst-tls13 tst-tls14 tst-tls15 tst-align \
tst-align2 $(tests-execstack-$(have-z-execstack)) tst-dlmodcount \
tst-dlopenrpath tst-deep1 tst-dlmopen1 tst-dlmopen2 tst-dlmopen3 \
unload3 unload4 unload5 unload6 tst-audit1 tst-global1 order2
unload3 unload4 unload5 unload6 tst-audit1 tst-global1 order2 \
tst-stackguard1
# reldep9
test-srcs = tst-pathopt
tests-vis-yes = vismain
@ -843,3 +845,6 @@ $(objpfx)order2mod1.so: $(objpfx)order2mod4.so
$(objpfx)order2mod4.so: $(objpfx)order2mod3.so
$(objpfx)order2mod2.so: $(objpfx)order2mod3.so
order2mod2.so-no-z-defs = yes
tst-stackguard1-ARGS = --command "$(built-program-cmd) --child"
tst-stackguard1-static-ARGS = --command "$(objpfx)tst-stackguard1-static --child"

4
elf/Versions
View File

@ -43,6 +43,10 @@ ld {
# runtime interface to TLS
__tls_get_addr;
}
GLIBC_2.4 {
# stack canary
__stack_chk_guard;
}
GLIBC_PRIVATE {
# Those are in the dynamic linker, but used by libc.so.
__libc_enable_secure;

56
elf/rtld.c
View File

@ -80,6 +80,12 @@ char **_dl_argv attribute_relro = NULL;
#endif
INTDEF(_dl_argv)
#ifndef THREAD_SET_STACK_GUARD
/* Only exported for architectures that don't store the stack guard canary
in thread local area. */
uintptr_t __stack_chk_guard attribute_relro;
#endif
/* Nonzero if we were run directly. */
unsigned int _dl_skip_args attribute_relro attribute_hidden;
@ -1398,9 +1404,6 @@ ld.so does not support TLS, but program uses it!\n");
always allocate the static block, we never defer it even if
no DF_STATIC_TLS bit is set. The reason is that we know
glibc will use the static model. */
# ifndef TLS_INIT_TP_EXPENSIVE
# define TLS_INIT_TP_EXPENSIVE 0
# endif
/* Since we start using the auditing DSOs right away we need to
initialize the data structures now. */
@ -1807,10 +1810,18 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
used. Trying to do it lazily is too hairy to try when there could be
multiple threads (from a non-TLS-using libpthread). */
bool was_tls_init_tp_called = tls_init_tp_called;
if (tcbp == NULL && (!TLS_INIT_TP_EXPENSIVE || GL(dl_tls_max_dtv_idx) > 0))
if (tcbp == NULL)
tcbp = init_tls ();
#endif
/* Set up the stack checker's canary. */
uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard ();
#ifdef THREAD_SET_STACK_GUARD
THREAD_SET_STACK_GUARD (stack_chk_guard);
#else
__stack_chk_guard = stack_chk_guard;
#endif
if (__builtin_expect (mode, normal) != normal)
{
/* We were run just to list the shared libraries. It is
@ -2230,29 +2241,26 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
#endif
#ifdef USE_TLS
if (GL(dl_tls_max_dtv_idx) > 0 || USE___THREAD || !TLS_INIT_TP_EXPENSIVE)
if (!was_tls_init_tp_called && GL(dl_tls_max_dtv_idx) > 0)
++GL(dl_tls_generation);
/* Now that we have completed relocation, the initializer data
for the TLS blocks has its final values and we can copy them
into the main thread's TLS area, which we allocated above. */
_dl_allocate_tls_init (tcbp);
/* And finally install it for the main thread. If ld.so itself uses
TLS we know the thread pointer was initialized earlier. */
if (! tls_init_tp_called)
{
if (!was_tls_init_tp_called && GL(dl_tls_max_dtv_idx) > 0)
++GL(dl_tls_generation);
/* Now that we have completed relocation, the initializer data
for the TLS blocks has its final values and we can copy them
into the main thread's TLS area, which we allocated above. */
_dl_allocate_tls_init (tcbp);
/* And finally install it for the main thread. If ld.so itself uses
TLS we know the thread pointer was initialized earlier. */
if (! tls_init_tp_called)
{
const char *lossage = TLS_INIT_TP (tcbp, USE___THREAD);
if (__builtin_expect (lossage != NULL, 0))
_dl_fatal_printf ("cannot set up thread-local storage: %s\n",
lossage);
}
const char *lossage = TLS_INIT_TP (tcbp, USE___THREAD);
if (__builtin_expect (lossage != NULL, 0))
_dl_fatal_printf ("cannot set up thread-local storage: %s\n",
lossage);
}
else
#else
NONTLS_INIT_TP;
#endif
NONTLS_INIT_TP;
#ifdef SHARED
/* Auditing checkpoint: we have added all objects. */

30
elf/stackguard-macros.h Normal file
View File

@ -0,0 +1,30 @@
#include <stdint.h>
#ifdef __i386__
# define STACK_CHK_GUARD \
({ uintptr_t x; asm ("movl %%gs:0x14, %0" : "=r" (x)); x; })
#elif defined __x86_64__
# define STACK_CHK_GUARD \
({ uintptr_t x; asm ("movq %%fs:0x28, %0" : "=r" (x)); x; })
#elif defined __powerpc64__
# define STACK_CHK_GUARD \
({ uintptr_t x; asm ("ld %0,-28688(13)" : "=r" (x)); x; })
#elif defined __powerpc__
# define STACK_CHK_GUARD \
({ uintptr_t x; asm ("lwz %0,-28680(2)" : "=r" (x)); x; })
#elif defined __sparc__ && defined __arch64__
# define STACK_CHK_GUARD \
({ uintptr_t x; asm ("ldx [%%g7+0x28], %0" : "=r" (x)); x; })
#elif defined __sparc__
# define STACK_CHK_GUARD \
({ uintptr_t x; asm ("ld [%%g7+0x14], %0" : "=r" (x)); x; })
#elif defined __s390x__
# define STACK_CHK_GUARD \
({ uintptr_t x; asm ("ear %0,%a0; sllg %0,%0,32; ear %0,%a1; lg %0,0x28(%0)" : "=r" (x)); x; })
#elif defined __s390__
# define STACK_CHK_GUARD \
({ uintptr_t x; asm ("ear %0,%%a0; l %0,0x14(%0)" : "=r" (x)); x; })
#else
extern uintptr_t __stack_chk_guard;
# define STACK_CHK_GUARD __stack_chk_guard
#endif

1
elf/tst-stackguard1-static.c Normal file
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@ -0,0 +1 @@
#include "tst-stackguard1.c"

196
elf/tst-stackguard1.c Normal file
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@ -0,0 +1,196 @@
/* Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2005.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <stackguard-macros.h>
#include <unistd.h>
static const char *command;
static bool child;
static uintptr_t stack_chk_guard_copy;
static bool stack_chk_guard_copy_set;
static int fds[2];
static void __attribute__ ((constructor))
con (void)
{
stack_chk_guard_copy = STACK_CHK_GUARD;
stack_chk_guard_copy_set = true;
}
static int
uintptr_t_cmp (const void *a, const void *b)
{
if (*(uintptr_t *) a < *(uintptr_t *) b)
return 1;
if (*(uintptr_t *) a > *(uintptr_t *) b)
return -1;
return 0;
}
static int
do_test (void)
{
if (!stack_chk_guard_copy_set)
{
puts ("constructor has not been run");
return 1;
}
if (stack_chk_guard_copy != STACK_CHK_GUARD)
{
puts ("STACK_CHK_GUARD changed between constructor and do_test");
return 1;
}
if (child)
{
write (2, &stack_chk_guard_copy, sizeof (stack_chk_guard_copy));
return 0;
}
if (command == NULL)
{
puts ("missing --command or --child argument");
return 1;
}
#define N 16
uintptr_t child_stack_chk_guards[N + 1];
child_stack_chk_guards[N] = stack_chk_guard_copy;
int i;
for (i = 0; i < N; ++i)
{
if (pipe (fds) < 0)
{
printf ("couldn't create pipe: %m\n");
return 1;
}
pid_t pid = fork ();
if (pid < 0)
{
printf ("fork failed: %m\n");
return 1;
}
if (!pid)
{
if (stack_chk_guard_copy != STACK_CHK_GUARD)
{
puts ("STACK_CHK_GUARD changed after fork");
exit (1);
}
close (fds[0]);
close (2);
dup2 (fds[1], 2);
close (fds[1]);
system (command);
exit (0);
}
close (fds[1]);
if (TEMP_FAILURE_RETRY (read (fds[0], &child_stack_chk_guards[i],
sizeof (uintptr_t))) != sizeof (uintptr_t))
{
puts ("could not read stack_chk_guard value from child");
return 1;
}
close (fds[0]);
pid_t termpid;
int status;
termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
if (termpid == -1)
{
printf ("waitpid failed: %m\n");
return 1;
}
else if (termpid != pid)
{
printf ("waitpid returned %ld != %ld\n",
(long int) termpid, (long int) pid);
return 1;
}
else if (!WIFEXITED (status) || WEXITSTATUS (status))
{
puts ("child hasn't exited with exit status 0");
return 1;
}
}
qsort (child_stack_chk_guards, N + 1, sizeof (uintptr_t), uintptr_t_cmp);
uintptr_t default_guard = 0;
unsigned char *p = (unsigned char *) &default_guard;
p[sizeof (uintptr_t) - 1] = 255;
p[sizeof (uintptr_t) - 2] = '\n';
p[0] = 0;
/* Test if the stack guard canaries are either randomized,
or equal to the default stack guard canary value.
Even with randomized stack guards it might happen
that the random number generator generates the same
values, but if that happens in more than half from
the 16 runs, something is very wrong. */
int ndifferences = 0;
int ndefaults = 0;
for (i = 0; i < N; ++i)
{
if (child_stack_chk_guards[i] != child_stack_chk_guards[i+1])
ndifferences++;
else if (child_stack_chk_guards[i] == default_guard)
ndefaults++;
}
printf ("differences %d defaults %d\n", ndifferences, ndefaults);
if (ndifferences < N / 2 && ndefaults < N / 2)
{
puts ("stack guard canaries are not randomized enough");
puts ("nor equal to the default canary value");
return 1;
}
return 0;
}
#define OPT_COMMAND 10000
#define OPT_CHILD 10001
#define CMDLINE_OPTIONS \
{ "command", required_argument, NULL, OPT_COMMAND }, \
{ "child", no_argument, NULL, OPT_CHILD },
#define CMDLINE_PROCESS \
case OPT_COMMAND: \
command = optarg; \
break; \
case OPT_CHILD: \
child = true; \
break;
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"

9
nptl/Makefile
View File

@ -269,7 +269,8 @@ tests += tst-cancelx2 tst-cancelx3 tst-cancelx4 tst-cancelx5 \
tst-oncex3 tst-oncex4
endif
ifeq ($(build-shared),yes)
tests += tst-atfork2 tst-tls3 tst-tls4 tst-tls5 tst-_res1 tst-fini1
tests += tst-atfork2 tst-tls3 tst-tls4 tst-tls5 tst-_res1 tst-fini1 \
tst-stackguard1
tests-nolibpthread += tst-fini1
ifeq ($(have-z-execstack),yes)
tests += tst-execstack
@ -337,7 +338,8 @@ link-libc-static := $(common-objpfx)libc.a $(static-gnulib) \
$(common-objpfx)libc.a
ifeq ($(build-static),yes)
tests-static += tst-locale1 tst-locale2
tests-static += tst-locale1 tst-locale2 tst-stackguard1-static
tests += tst-stackguard1-static
xtests-static += tst-setuid1-static
endif
# These tests are linked with libc before libpthread
@ -586,6 +588,9 @@ LDFLAGS-tst-execstack = -Wl,-z,noexecstack
$(objpfx)tst-fini1mod.so: $(shared-thread-library)
tst-stackguard1-ARGS = --command "$(built-program-cmd) --child"
tst-stackguard1-static-ARGS = --command "$(objpfx)tst-stackguard1-static --child"
# The tests here better do not run in parallel
ifneq ($(filter %tests,$(MAKECMDGOALS)),)
.NOTPARALLEL:

5
nptl/pthread_create.c
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@ -399,6 +399,11 @@ __pthread_create_2_1 (newthread, attr, start_routine, arg)
pd->schedpolicy = self->schedpolicy;
pd->schedparam = self->schedparam;
/* Copy the stack guard canary. */
#ifdef THREAD_COPY_STACK_GUARD
THREAD_COPY_STACK_GUARD (pd);
#endif
/* Determine scheduling parameters for the thread. */
if (attr != NULL
&& __builtin_expect ((iattr->flags & ATTR_FLAG_NOTINHERITSCHED) != 0, 0)

9
nptl/sysdeps/i386/tls.h
View File

@ -49,6 +49,7 @@ typedef struct
void *self; /* Pointer to the thread descriptor. */
int multiple_threads;
uintptr_t sysinfo;
uintptr_t stack_guard;
} tcbhead_t;
# define TLS_MULTIPLE_THREADS_IN_TCB 1
@ -416,6 +417,14 @@ union user_desc_init
__res; })
/* Set the stack guard field in TCB head. */
#define THREAD_SET_STACK_GUARD(value) \
THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
#define THREAD_COPY_STACK_GUARD(descr) \
((descr)->header.stack_guard \
= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
#endif /* __ASSEMBLER__ */
#endif /* tls.h */

22
nptl/sysdeps/powerpc/tls.h
View File

@ -65,11 +65,11 @@ typedef union dtv
/* Get the thread descriptor definition. */
# include <nptl/descr.h>
/* This layout is actually wholly private and not affected by the ABI.
Nor does it overlap the pthread data structure, so we need nothing
extra here at all. */
/* The stack_guard is accessed directly by GCC -fstack-protector code,
so it is a part of public ABI. The dtv field is private. */
typedef struct
{
uintptr_t stack_guard;
dtv_t *dtv;
} tcbhead_t;
@ -127,7 +127,7 @@ register void *__thread_register __asm__ ("r13");
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
(((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv)
(((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv)
/* Return the thread descriptor for the current thread. */
# define THREAD_SELF \
@ -136,9 +136,9 @@ register void *__thread_register __asm__ ("r13");
/* Magic for libthread_db to know how to do THREAD_SELF. */
# define DB_THREAD_SELF \
REGISTER (32, 32, PT_THREAD_POINTER * 4, \
REGISTER (32, 32, PT_THREAD_POINTER * 4, \
- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \
REGISTER (64, 64, PT_THREAD_POINTER * 8, \
REGISTER (64, 64, PT_THREAD_POINTER * 8, \
- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)
/* Read member of the thread descriptor directly. */
@ -156,6 +156,16 @@ register void *__thread_register __asm__ ("r13");
# define THREAD_SETMEM_NC(descr, member, idx, value) \
((void)(descr), (THREAD_SELF)->member[idx] = (value))
/* Set the stack guard field in TCB head. */
# define THREAD_SET_STACK_GUARD(value) \
(((tcbhead_t *) ((char *) __thread_register \
- TLS_TCB_OFFSET))[-1].stack_guard = (value))
# define THREAD_COPY_STACK_GUARD(descr) \
(((tcbhead_t *) ((char *) (descr) \
+ TLS_PRE_TCB_SIZE))[-1].stack_guard \
= ((tcbhead_t *) ((char *) __thread_register \
- TLS_TCB_OFFSET))[-1].stack_guard)
/* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some
different value to mean unset l_tls_offset. */
# define NO_TLS_OFFSET -1

10
nptl/sysdeps/s390/tls.h
View File

@ -48,9 +48,8 @@ typedef struct
dtv_t *dtv;
void *self; /* Pointer to the thread descriptor. */
int multiple_threads;
# ifdef NEED_DL_SYSINFO
uintptr_t sysinfo;
# endif
uintptr_t stack_guard;
} tcbhead_t;
# ifndef __s390x__
@ -158,6 +157,13 @@ typedef struct
#define THREAD_SETMEM_NC(descr, member, idx, value) \
descr->member[idx] = (value)
/* Set the stack guard field in TCB head. */
#define THREAD_SET_STACK_GUARD(value) \
THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
#define THREAD_COPY_STACK_GUARD(descr) \
((descr)->header.stack_guard \
= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
#endif /* __ASSEMBLER__ */
#endif /* tls.h */

9
nptl/sysdeps/sparc/tls.h
View File

@ -46,6 +46,8 @@ typedef struct
dtv_t *dtv;
void *self;
int multiple_threads;
uintptr_t sysinfo;
uintptr_t stack_guard;
} tcbhead_t;
#else /* __ASSEMBLER__ */
@ -126,6 +128,13 @@ register struct pthread *__thread_self __asm__("%g7");
#define THREAD_SETMEM_NC(descr, member, idx, value) \
descr->member[idx] = (value)
/* Set the stack guard field in TCB head. */
#define THREAD_SET_STACK_GUARD(value) \
THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
# define THREAD_COPY_STACK_GUARD(descr) \
((descr)->header.stack_guard \
= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
#endif /* !ASSEMBLER */
#endif /* tls.h */

9
nptl/sysdeps/x86_64/tls.h
View File

@ -47,6 +47,8 @@ typedef struct
dtv_t *dtv;
void *self; /* Pointer to the thread descriptor. */
int multiple_threads;
uintptr_t sysinfo;
uintptr_t stack_guard;
} tcbhead_t;
#else /* __ASSEMBLER__ */
@ -320,6 +322,13 @@ typedef struct
__res; })
/* Set the stack guard field in TCB head. */
# define THREAD_SET_STACK_GUARD(value) \
THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
# define THREAD_COPY_STACK_GUARD(descr) \
((descr)->header.stack_guard \
= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
#endif /* __ASSEMBLER__ */
#endif /* tls.h */

1
nptl/tst-stackguard1-static.c Normal file
View File

@ -0,0 +1 @@
#include "tst-stackguard1.c"

226
nptl/tst-stackguard1.c Normal file
View File

@ -0,0 +1,226 @@
/* Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2005.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <elf/stackguard-macros.h>
#include <unistd.h>
static const char *command;
static bool child;
static uintptr_t stack_chk_guard_copy;
static bool stack_chk_guard_copy_set;
static int fds[2];
static void __attribute__ ((constructor))
con (void)
{
stack_chk_guard_copy = STACK_CHK_GUARD;
stack_chk_guard_copy_set = true;
}
static int
uintptr_t_cmp (const void *a, const void *b)
{
if (*(uintptr_t *) a < *(uintptr_t *) b)
return 1;
if (*(uintptr_t *) a > *(uintptr_t *) b)
return -1;
return 0;
}
static void *
tf (void *arg)
{
if (stack_chk_guard_copy != STACK_CHK_GUARD)
{
puts ("STACK_CHK_GUARD changed in thread");
return (void *) 1L;
}
return NULL;
}
static int
do_test (void)
{
if (!stack_chk_guard_copy_set)
{
puts ("constructor has not been run");
return 1;
}
if (stack_chk_guard_copy != STACK_CHK_GUARD)
{
puts ("STACK_CHK_GUARD changed between constructor and do_test");
return 1;
}
if (child)
{
int i;
pthread_t th[4];
void *ret;
for (i = 0; i < 4; ++i)
if (pthread_create (&th[i], NULL, tf, NULL))
{
puts ("thread creation failed");
return 1;
}
for (i = 0; i < 4; ++i)
if (pthread_join (th[i], &ret))
{
puts ("thread join failed");
return 1;
}
else if (ret != NULL)
return 1;
write (2, &stack_chk_guard_copy, sizeof (stack_chk_guard_copy));
return 0;
}
if (command == NULL)
{
puts ("missing --command or --child argument");
return 1;
}
#define N 16
uintptr_t child_stack_chk_guards[N + 1];
child_stack_chk_guards[N] = stack_chk_guard_copy;
int i;
for (i = 0; i < N; ++i)
{
if (pipe (fds) < 0)
{
printf ("couldn't create pipe: %m\n");
return 1;
}
pid_t pid = fork ();
if (pid < 0)
{
printf ("fork failed: %m\n");
return 1;
}
if (!pid)
{
if (stack_chk_guard_copy != STACK_CHK_GUARD)
{
puts ("STACK_CHK_GUARD changed after fork");
exit (1);
}
close (fds[0]);
close (2);
dup2 (fds[1], 2);
close (fds[1]);
system (command);
exit (0);
}
close (fds[1]);
if (TEMP_FAILURE_RETRY (read (fds[0], &child_stack_chk_guards[i],
sizeof (uintptr_t))) != sizeof (uintptr_t))
{
puts ("could not read stack_chk_guard value from child");
return 1;
}
close (fds[0]);
pid_t termpid;
int status;
termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
if (termpid == -1)
{
printf ("waitpid failed: %m\n");
return 1;
}
else if (termpid != pid)
{
printf ("waitpid returned %ld != %ld\n",
(long int) termpid, (long int) pid);
return 1;
}
else if (!WIFEXITED (status) || WEXITSTATUS (status))
{
puts ("child hasn't exited with exit status 0");
return 1;
}
}
qsort (child_stack_chk_guards, N + 1, sizeof (uintptr_t), uintptr_t_cmp);
uintptr_t default_guard = 0;
unsigned char *p = (unsigned char *) &default_guard;
p[sizeof (uintptr_t) - 1] = 255;
p[sizeof (uintptr_t) - 2] = '\n';
p[0] = 0;
/* Test if the stack guard canaries are either randomized,
or equal to the default stack guard canary value.
Even with randomized stack guards it might happen
that the random number generator generates the same
values, but if that happens in more than half from
the 16 runs, something is very wrong. */
int ndifferences = 0;
int ndefaults = 0;
for (i = 0; i < N; ++i)
{
if (child_stack_chk_guards[i] != child_stack_chk_guards[i+1])
ndifferences++;
else if (child_stack_chk_guards[i] == default_guard)
ndefaults++;
}
printf ("differences %d defaults %d\n", ndifferences, ndefaults);
if (ndifferences < N / 2 && ndefaults < N / 2)
{
puts ("stack guard canaries are not randomized enough");
puts ("nor equal to the default canary value");
return 1;
}
return 0;
}
#define OPT_COMMAND 10000
#define OPT_CHILD 10001
#define CMDLINE_OPTIONS \
{ "command", required_argument, NULL, OPT_COMMAND }, \
{ "child", no_argument, NULL, OPT_CHILD },
#define CMDLINE_PROCESS \
case OPT_COMMAND: \
command = optarg; \
break; \
case OPT_CHILD: \
child = true; \
break;
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"

13
sysdeps/generic/dl-osinfo.h
View File

@ -1 +1,12 @@
/* Nothing needed in general. */
#include <stdint.h>
static inline uintptr_t __attribute__ ((always_inline))
_dl_setup_stack_chk_guard (void)
{
uintptr_t ret = 0;
unsigned char *p = (unsigned char *) &ret;
p[sizeof (ret) - 1] = 255;
p[sizeof (ret) - 2] = '\n';
p[0] = 0;
return ret;
}

15
sysdeps/generic/libc-start.c
View File

@ -35,6 +35,11 @@ extern void __pthread_initialize_minimal (void)
__attribute__ ((weak))
# endif
;
# ifndef THREAD_SET_STACK_GUARD
/* Only exported for architectures that don't store the stack guard canary
in thread local area. */
uintptr_t __stack_chk_guard attribute_relro;
# endif
#endif
#ifdef HAVE_PTR_NTHREADS
@ -152,6 +157,16 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
__pthread_initialize_minimal ();
#endif
# ifndef SHARED
/* Set up the stack checker's canary. */
uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard ();
# ifdef THREAD_SET_STACK_GUARD
THREAD_SET_STACK_GUARD (stack_chk_guard);
# else
__stack_chk_guard = stack_chk_guard;
# endif
#endif
/* Register the destructor of the dynamic linker if there is any. */
if (__builtin_expect (rtld_fini != NULL, 1))
__cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);

11
sysdeps/generic/libc-tls.c
View File

@ -133,17 +133,6 @@ __libc_setup_tls (size_t tcbsize, size_t tcbalign)
break;
}
#ifdef TLS_INIT_TP_EXPENSIVE
if (memsz == 0 && tcbsize <= TLS_INIT_TCB_SIZE)
{
/* We do not need a TLS block and no thread descriptor. */
# ifdef NONTLS_INIT_TP
NONTLS_INIT_TP;
# endif
return;
}
#endif
/* We have to set up the TCB block which also (possibly) contains
'errno'. Therefore we avoid 'malloc' which might touch 'errno'.
Instead we use 'sbrk' which would only uses 'errno' if it fails.

22
sysdeps/unix/sysv/linux/dl-osinfo.h
View File

@ -23,6 +23,7 @@
#include <sys/utsname.h>
#include "kernel-features.h"
#include <dl-sysdep.h>
#include <stdint.h>
#ifndef MIN
# define MIN(a,b) (((a)<(b))?(a):(b))
@ -157,3 +158,24 @@ _dl_discover_osversion (void)
else if (__LINUX_KERNEL_VERSION > 0) \
FATAL ("FATAL: cannot determine kernel version\n"); \
} while (0)
static inline uintptr_t __attribute__ ((always_inline))
_dl_setup_stack_chk_guard (void)
{
uintptr_t ret;
#ifdef ENABLE_STACKGUARD_RANDOMIZE
int fd = __open ("/dev/urandom", O_RDONLY);
if (fd >= 0)
{
ssize_t reslen = __read (fd, &ret, sizeof (ret));
__close (fd);
if (reslen == (ssize_t) sizeof (ret))
return ret;
}
#endif
ret = 0;
unsigned char *p = (unsigned char *) &ret;
p[sizeof (ret) - 1] = 255;
p[sizeof (ret) - 2] = '\n';
return ret;
}