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[Bug libc/21752] __stack_chk_fail should do as little work as possible
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 21 Jul 2017 22:40:49 +0000
- Subject: [Bug libc/21752] __stack_chk_fail should do as little work as possible
- Auto-submitted: auto-generated
- References: <bug-21752-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=21752
--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".
The branch, hjl/pie/static has been created
at 76509fc640af3dd76830949006946f4d19f83384 (commit)
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=76509fc640af3dd76830949006946f4d19f83384
commit 76509fc640af3dd76830949006946f4d19f83384
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Jul 19 14:32:42 2017 -0700
Add _startup_sbrk and _startup_fatal
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5094f18c49d54585af1d5aa62aaa1346af14879d
commit 5094f18c49d54585af1d5aa62aaa1346af14879d
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Jul 19 09:32:45 2017 -0700
i386: Define I386_USE_SYSENTER to 0 or 1 and check PIC
Define I386_USE_SYSENTER to 0 or 1 so that special versions of syscalls
with "int $0x80" can be provided for static PIE during start up. Also
check PIC instead SHARED for PIC version of syscall macros.
* sysdeps/unix/sysv/linux/i386/sysdep.h (I386_USE_SYSENTER):
Define to I386_USE_SYSENTER to 0 or 1 if not defined.
(ENTER_KERNEL): Check if I386_USE_SYSENTER is 1 and check PIC.
(INTERNAL_SYSCALL_MAIN_INLINE): Likewise.
(INTERNAL_SYSCALL_NCS): Likewise.
(LOADARGS_1): Likewise.
(LOADARGS_5): Likewise.
(RESTOREARGS_1): Likewise.
(RESTOREARGS_5): Likewise.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9712df2613cf78aa6592ee76a566501373c627af
commit 9712df2613cf78aa6592ee76a566501373c627af
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Jul 18 15:46:40 2017 -0700
i386: Check PIC in i386 multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9ef0ff32537eb6d08ffc78e1c34e40884496e42a
commit 9ef0ff32537eb6d08ffc78e1c34e40884496e42a
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Jul 18 15:45:46 2017 -0700
i386: Check PIC instead of SHARED in start.S
Support static PIE. Avoid relocation in static PIE since _start is
called before it is relocated.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e6645591c35d61dd703b2a347208b212976a4085
commit e6645591c35d61dd703b2a347208b212976a4085
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Jul 18 10:42:48 2017 -0700
Use hidden visibility for ENABLE_STATIC_PIE
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6cc544c111ce73ea655d9eeef7c7727ffe839b71
commit 6cc544c111ce73ea655d9eeef7c7727ffe839b71
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Jul 17 13:53:52 2017 -0700
Add _dl_relocate_static_pie
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a0ba8ddafca01c9fd0db22c40ab8b6f7ee0c02ea
commit a0ba8ddafca01c9fd0db22c40ab8b6f7ee0c02ea
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Jul 17 08:54:40 2017 -0700
Define pie-default/default-pie-ldflag for --enable-static-pie
1. Add $(pie-default) to CFLAGS-.o and CFLAGS-.op.
2. Add $(default-pie-ldflag) to +link-static-before-libc.
3. Define +prectorT/+postctorT to $(+prectorS)/$(+postctorS).
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d0079c616e1c087dc2461666579c9dd0196041f9
commit d0079c616e1c087dc2461666579c9dd0196041f9
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Jul 18 05:58:21 2017 -0700
x86-64: Check if linker supports static PIE
Need the linker with fix for:
https://sourceware.org/bugzilla/show_bug.cgi?id=21782
Binutils 2.29 is OK.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9340f3ca8edfe1164e912f370617ada41979325b
commit 9340f3ca8edfe1164e912f370617ada41979325b
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Jul 17 08:36:45 2017 -0700
Add --enable-static-pie
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1f7cf6a43dd46f4d5240cdb115d2046b147d5b7b
commit 1f7cf6a43dd46f4d5240cdb115d2046b147d5b7b
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Fri Jul 21 05:07:19 2017 -0700
Check if -static-pie works
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=300f39770f15319b9927124408b0cb561e8165fb
commit 300f39770f15319b9927124408b0cb561e8165fb
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Jul 17 08:17:32 2017 -0700
Check if linker supports --no-dynamic-linker
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=95f848ad771f3c53b539cf3dab50349a16ac7565
commit 95f848ad771f3c53b539cf3dab50349a16ac7565
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Jul 18 05:23:21 2017 -0700
x86-64: Check PIC instead of SHARED in start.S
PIC may be the default.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=509095e6ab37b9d0e323717c73b1f6edb79d1c9d
commit 509095e6ab37b9d0e323717c73b1f6edb79d1c9d
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Jul 18 15:36:20 2017 -0700
x86: Remove assembly versions of HAS_CPU_FEATURE/HAS_ARCH_FEATURE
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ba16d3befdaf500ba80a8589a72f66676f67e6f6
commit ba16d3befdaf500ba80a8589a72f66676f67e6f6
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Jul 19 06:54:03 2017 -0700
i386: Convert IFUNC selectors to C
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=994ed23d7117ef2f4666b8c7a06a40b5a26f768e
commit 994ed23d7117ef2f4666b8c7a06a40b5a26f768e
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Jul 18 15:35:30 2017 -0700
x86-64: Convert libmathvec IFUNC selectors to C
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=87e74ea270b29865c5c63c122886bffa33b82c39
commit 87e74ea270b29865c5c63c122886bffa33b82c39
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Jul 18 13:56:17 2017 -0700
x86-64: Convert libm IFUNC selectors to C
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=be329c484002349111004cb639e8ff847e26899b
commit be329c484002349111004cb639e8ff847e26899b
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Jul 19 08:46:08 2017 -0700
i386: Don't define multiarch __memmove_chk in libc.a [BZ #21791]
There is no need to define multiarch __memmove_chk in libc.a.
[BZ #21791]
* sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S
(MEMCPY_CHK): Define only if SHARED is defined.
* sysdeps/i386/i686/multiarch/memcpy-ssse3-rep.S (MEMCPY_CHK):
Likewise.
* sysdeps/i386/i686/multiarch/memcpy-ssse3.S (MEMCPY_CHK):
Likewise.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eec8437ce61980a00ca9bf3ab21b0d1545230929
commit eec8437ce61980a00ca9bf3ab21b0d1545230929
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Jul 19 10:56:19 2017 -0700
Avoid accessing corrupted stack from __stack_chk_fail [BZ #21752]
__libc_argv[0] points to address on stack and __libc_secure_getenv
accesses environment variables which are on stack. We should avoid
accessing stack when stack is corrupted.
This patch also renames function argument in __fortify_fail_abort
from do_backtrace to need_backtrace to avoid confusion with do_backtrace
from enum __libc_message_action.
[BZ #21752]
* debug/fortify_fail.c (__fortify_fail_abort): Don't pass down
__libc_argv[0] if we aren't doing backtrace. Rename do_backtrace
to need_backtrace.
* sysdeps/posix/libc_fatal.c (__libc_message): Don't call
__libc_secure_getenv if we aren't doing backtrace.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=55849e2728b6899d79b543a3140c4e2065032b1d
commit 55849e2728b6899d79b543a3140c4e2065032b1d
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Jul 19 16:53:06 2017 -0700
tunables: Use direct syscall for access (BZ#21744)
The function maybe_enable_malloc_check, which is called by
__tunables_init, calls __access_noerrno. It isn't problem when
symbol is is in ld.so, which has a special version of __access_noerrno
without stack protector. But when glibc is built with stack protector,
maybe_enable_malloc_check in libc.a can't call the regular version of
__access_noerrno with stack protector.
This patch changes how Linux defines the __access_noerrno to be an
inline call instead and thus preventing defining different build
rules for ld/static and shared.
H.J. Lu <hongjiu.lu@intel.com>
Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf/dl-tunables.c: Include not-errno.h header.
* include/unistd.h (__access_noerrno): Remove definition.
* sysdeps/unix/sysv/linux/access.c (__access_noerrno): Likewise.
* sysdeps/generic/not-errno.h: New file.
* sysdeps/unix/sysv/linux/not-errno.h: Likewise.
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