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68448be208
glibc/sysdeps/unix/sysv/linux/i386
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Adhemerval Zanella 68448be208 i386: Fix i386 sigaction sa_restorer initialization (BZ#21269) 
This patch fixes the i386 sa_restorer field initialization for sigaction
syscall for kernel with vDSO.  As described in bug report, i386 Linux
(and compat on x86_64) interprets SA_RESTORER clear with nonzero
sa_restorer as a request for stack switching if the SS segment is 'funny'.
This means that anything that tries to mix glibc's signal handling with
segmentation (for instance through modify_ldt syscall) is randomly broken
depending on what values lands in sa_restorer.

The testcase added  is based on Linux test tools/testing/selftests/x86/ldt_gdt.c,
more specifically in do_multicpu_tests function.  The main changes are:

  - C11 atomics instead of plain access.

  - Remove x86_64 support which simplifies the syscall handling and fallbacks.

  - Replicate only the test required to trigger the issue.

Checked on i686-linux-gnu.

	[BZ #21269]
	* sysdeps/unix/sysv/linux/i386/Makefile (tests): Add tst-bz21269.
	* sysdeps/unix/sysv/linux/i386/sigaction.c (SET_SA_RESTORER): Clear
	sa_restorer for vDSO case.
	* sysdeps/unix/sysv/linux/i386/tst-bz21269.c: New file.
2018-03-05 18:08:27 -03:00
..
i686 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
i786 Move remaining nptl/sysdeps/unix/sysv/linux/i386/ files. 2014-05-14 13:37:40 -07:00
____longjmp_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
_exit.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
alphasort64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
arch-fork.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
brk.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
c++-types.data x86: Move abilist files out of nptl/ subdirectories. 2014-05-14 15:45:23 -07:00
clone.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
configure Require Linux kernel 3.2 or later on x86 / x86_64. 2017-05-08 10:45:20 +00:00
configure.ac Require Linux kernel 3.2 or later on x86 / x86_64. 2017-05-08 10:45:20 +00:00
dl-librecon.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-procinfo.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-sysdep.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
fxstat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
fxstatat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
get_clockfreq.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getcontext.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getdents64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getmsg.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
gettimeofday.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
Implies NPTL is no longer an add-on! 2014-07-07 09:29:06 -07:00
init-first.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
jmp_buf-macros.h Add jmp_buf-macros.h 2017-11-09 05:10:03 -08:00
kernel-features.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ld.abilist ld.so: Remove __libc_memalign 2016-11-30 16:23:58 +01:00
ldconfig.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libanl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libBrokenLocale.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libc-do-syscall.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libc-lowlevellock.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libc.abilist copy_file_range: New function to copy file data 2017-12-22 10:55:40 +01:00
libcrypt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libdl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libm.abilist Add narrowing add functions. 2018-02-10 02:08:43 +00:00
libnsl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libpthread.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libresolv.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
librt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libthread_db.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libutil.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
lll_timedlock_wait.c Move sysdeps/unix/sysv/linux/i386/i486/*.? to i386 2015-09-30 10:12:44 -07:00
lll_timedwait_tid.c Move sysdeps/unix/sysv/linux/i386/i486/*.? to i386 2015-09-30 10:12:44 -07:00
localplt.data ld.so: Introduce struct dl_exception 2017-08-10 16:54:57 +02:00
lockf64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
lowlevellock.h Define GEN_AS_CONST_HEADERS when generating header files [BZ #22792] 2018-02-23 11:29:39 -08:00
lowlevellock.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
lxstat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
makecontext.S i386: In makecontext, align the stack before calling exit [BZ #22667] 2018-01-04 18:47:35 +01:00
Makefile i386: Fix i386 sigaction sa_restorer initialization (BZ#21269) 2018-03-05 18:08:27 -03:00
profil-counter.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
putmsg.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
readdir64_r.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
readdir64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
readelflib.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
register-dump.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
scandir64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
setcontext.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
shlib-versions Clean up gnu/lib-names.h generation (bug 14171). 2014-09-26 17:33:04 +00:00
sigaction.c i386: Fix i386 sigaction sa_restorer initialization (BZ#21269) 2018-03-05 18:08:27 -03:00
sigcontextinfo.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
smp.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
startup.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
swapcontext.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
syscall.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
syscalls.list posix: Consolidate Linux waitpid syscall 2017-05-18 18:06:47 -03:00
sysdep.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sysdep.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
time.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-bz21269.c i386: Fix i386 sigaction sa_restorer initialization (BZ#21269) 2018-03-05 18:08:27 -03:00
ucontext_i.sym * sysdeps/unix/sysv/linux/i386/ucontext_i.h: File removed. 2005-12-22 05:18:34 +00:00
Versions Clean pthread functions namespaces for C11 threads 2017-06-23 17:38:17 -03:00
versionsort64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
vfork.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
xstat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00