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Linux: Block signals around _Fork (bug 32215)

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This hides the inconsistent TCB state (missing robust mutex list) from
signal handlers.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2024-09-28 09:44:25 +02:00
parent a7b5eb821d
commit b300078d97
1 changed files with 7 additions and 0 deletions
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7
sysdeps/nptl/_Fork.c
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@ -22,6 +22,11 @@
pid_t
_Fork (void)
{
/* Block all signals to avoid revealing the inconsistent TCB state
to a signal handler after fork. */
internal_sigset_t original_sigmask;
internal_signal_block_all (&original_sigmask);
pid_t pid = arch_fork (&THREAD_SELF->tid);
if (pid == 0)
{
@ -44,6 +49,8 @@ _Fork (void)
INTERNAL_SYSCALL_CALL (set_robust_list, &self->robust_head,
sizeof (struct robust_list_head));
}
internal_signal_restore_set (&original_sigmask);
return pid;
}
libc_hidden_def (_Fork)