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Adhemerval Zanella d40ac01cbb stdlib: Make abort/_Exit AS-safe (BZ 26275) 
The recursive lock used on abort does not synchronize with a new process
creation (either by fork-like interfaces or posix_spawn ones), nor it
is reinitialized after fork().

Also, the SIGABRT unblock before raise() shows another race condition,
where a fork or posix_spawn() call by another thread, just after the
recursive lock release and before the SIGABRT signal, might create
programs with a non-expected signal mask.  With the default option
(without POSIX_SPAWN_SETSIGDEF), the process can see SIG_DFL for
SIGABRT, where it should be SIG_IGN.

To fix the AS-safe, raise() does not change the process signal mask,
and an AS-safe lock is used if a SIGABRT is installed or the process
is blocked or ignored.  With the signal mask change removal,
there is no need to use a recursive loc.  The lock is also taken on
both _Fork() and posix_spawn(), to avoid the spawn process to see the
abort handler as SIG_DFL.

A read-write lock is used to avoid serialize _Fork and posix_spawn
execution.  Both sigaction (SIGABRT) and abort() requires to lock
as writer (since both change the disposition).

The fallback is also simplified: there is no need to use a loop of
ABORT_INSTRUCTION after _exit() (if the syscall does not terminate the
process, the system is broken).

The proposed fix changes how setjmp works on a SIGABRT handler, where
glibc does not save the signal mask.  So usage like the below will now
always abort.

  static volatile int chk_fail_ok;
  static jmp_buf chk_fail_buf;

  static void
  handler (int sig)
  {
    if (chk_fail_ok)
      {
        chk_fail_ok = 0;
        longjmp (chk_fail_buf, 1);
      }
    else
      _exit (127);
  }
  [...]
  signal (SIGABRT, handler);
  [....]
  chk_fail_ok = 1;
  if (! setjmp (chk_fail_buf))
    {
      // Something that can calls abort, like a failed fortify function.
      chk_fail_ok = 0;
      printf ("FAIL\n");
    }

Such cases will need to use sigsetjmp instead.

The _dl_start_profile calls sigaction through _profil, and to avoid
pulling abort() on loader the call is replaced with __libc_sigaction.

Checked on x86_64-linux-gnu and aarch64-linux-gnu.

Reviewed-by: DJ Delorie <dj@redhat.com>
2024-10-08 14:40:12 -03:00
..
net Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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sys Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
_G_config.h Post-cleanup 2: minimize _G_config.h. 2018-02-07 10:10:32 -05:00
_itoa.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
a.out.h
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allocalim.h
arch-fd_to_filename.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
asm-syntax.h
atomic-machine.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
c++-types.data
confstr.h
crti.S Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
crtn.S Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
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dirstream.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-affinity.h elf: Add CPU iteration support for future use in ld.so diagnostics 2024-04-08 16:48:55 +02:00
dl-audit-check.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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dl-procinfo.c
dl-procinfo.h elf: Remove HWCAP_IMPORTANT 2024-06-18 10:45:36 +02:00
dl-procruntime.c ld.so: Add architecture specific fields 2017-11-13 08:02:52 -08:00
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dl-vdso-setup.c elf: Move vDSO setup to rtld (BZ#24967) 2020-01-03 11:22:07 -03:00
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entry.h
errqueue.h
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fd_to_filename.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
features-time64.h Reinstate generic features-time64.h 2024-04-05 09:02:36 -03:00
fenv_private.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fix-float-double-convert-nan.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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fix-int-fp-convert-zero.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
float128-abi.h Move some float128 symbol version definitions. 2017-10-16 22:04:42 +00:00
fork.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fpu_control.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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ifunc-init.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ifunc-sel.h
internal-signals.h stdlib: Make abort/_Exit AS-safe (BZ 26275) 2024-10-08 14:40:12 -03:00
internal-sigset.h stdlib: Make abort/_Exit AS-safe (BZ 26275) 2024-10-08 14:40:12 -03:00
intr-msg.h
ld.abilist
ldbl-classify-compat.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ldconfig.h Remove ia64-linux-gnu 2024-01-08 17:09:36 -03:00
ldsodefs.h elf: Avoid re-initializing already allocated TLS in dlopen (bug 31717) 2024-08-05 18:26:52 +02:00
libanl.abilist
libBrokenLocale.abilist
libc_malloc_debug.abilist Move malloc hooks into a compat DSO 2021-07-22 18:37:59 +05:30
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libc-tsd.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
libc.abilist linux: Add pidfd_getfd 2022-05-17 10:33:07 -03:00
libdl.abilist
libm-alias-double.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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libm-test-ulps Replace gen-libm-test.pl with gen-libm-test.py. 2018-08-09 15:34:12 +00:00
libm-test-ulps-name
libm.abilist
libnsl.abilist
libnss_compat.abilist
libnss_db.abilist
libnss_dns.abilist
libnss_files.abilist
libnss_hesiod.abilist
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libpthread.abilist
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libutil.abilist
link_map.h Initial support for GNU_PROPERTY_1_NEEDED 2021-10-07 10:26:08 -07:00
linkmap.h
local-setxid.h
localplt.data elf: Rework exception handling in the dynamic loader [BZ #25486] 2022-11-03 09:39:31 +01:00
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Makefile Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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math_ldbl_opt.h Use PRINTF_LDBL_IS_DBL instead of __ldbl_is_dbl. 2018-12-05 18:15:43 -02:00
math_ldbl.h
math_private_calls.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
math_private.h aarch64: Add vector implementations of cos routines 2023-06-30 09:04:10 +01:00
math-barriers.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
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math-use-builtins-ceil.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-copysign.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fabs.h math: Add math-use-builtins-fabs (BZ#29027) 2022-05-23 17:49:18 -03:00
math-use-builtins-ffs.h string: Use builtins for ffs and ffsll 2024-02-01 09:31:33 -03:00
math-use-builtins-floor.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fma.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fmax.h math: Add math-use-builtinds-fmax.h 2021-12-13 09:08:07 -03:00
math-use-builtins-fmin.h math: Add math-use-builtinds-fmin.h 2021-12-13 10:08:43 -03:00
math-use-builtins-llrint.h Use GCC builtins for llrint functions if desired. 2022-11-29 16:00:28 +08:00
math-use-builtins-logb.h Use GCC builtins for logb functions if desired. 2022-11-29 16:00:28 +08:00
math-use-builtins-lrint.h Use GCC builtins for lrint functions if desired. 2022-11-29 16:00:28 +08:00
math-use-builtins-nearbyint.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-rint.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-round.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-roundeven.h Use GCC builtins for roundeven functions if desired. 2021-06-27 07:56:57 -07:00
math-use-builtins-sqrt.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-trunc.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins.h string: Use builtins for ffs and ffsll 2024-02-01 09:31:33 -03:00
memcopy.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
memswap.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
mmap_info.h posix: Fix large mmap64 offset for mips64n32 (BZ#24699) 2019-07-10 16:52:50 -03:00
mremap-failure.h Add mremap tests 2024-08-01 05:06:12 -07:00
nan-high-order-bit.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
not-cancel.h Make __getrandom_nocancel set errno and add a _nostatus version 2024-01-12 14:23:11 +01:00
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paths.h
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rtld-lowlevel.h
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stackguard-macros.h
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string-shift.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
struct_stat_time64.h linux: Add {f}stat{at} y2038 support 2020-10-09 17:02:07 -03:00
symbol-hacks.h Disable symbol hack in libc_nonshared.a 2021-09-27 07:46:25 -07:00
syscall_types.h nptl: Fix Race conditions in pthread cancellation [BZ#12683] 2024-08-23 14:27:43 -03:00
sysdep-cancel.h nptl: Remove tst-cancel-wrappers test and related macros 2019-01-03 18:38:08 -02:00
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thread_state.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
time64-compat.h y2038: Add support for 64-bit time on legacy ABIs 2021-06-15 10:42:11 -03:00
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tst-audit.h
tst-file-align.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-stack-align.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unsecvars.h elf: Remove LD_HWCAP_MASK / tunable glibc.cpu.hwcap_mask 2024-06-18 10:45:36 +02:00
unwind-arch.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-dw2-fde-glibc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-dw2-fde.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-dw2-fde.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-dw2.c Remove ia64-linux-gnu 2024-01-08 17:09:36 -03:00
unwind-link.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-pe.c
unwind-pe.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-resume.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-resume.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind.h Remove ia64-linux-gnu 2024-01-08 17:09:36 -03:00
utmp-equal.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
utmp-size.h login: Check default sizes of structs utmp, utmpx, lastlog 2024-04-19 14:38:17 +02:00
xstatver.h Remove mknod wrapper functions, move them to symbols 2020-10-09 17:02:06 -03:00