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remove implementation-reserved bits when saving signal mask

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this fix is necessary because a program could be started with some of
the implementation-reserved signals masked (e.g. due to exec having
been called from a signal handler, or from a non-musl program) and
then could obtain an invalid-to-use-later sigset_t as the old/saved
signal mask.
This commit is contained in:
Rich Felker
2012-06-02 20:04:27 -04:00
parent 1e597a3e9b
commit 40bd1726b6
1 changed files with 11 additions and 1 deletions
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12
src/thread/pthread_sigmask.c
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@ -5,6 +5,16 @@
int pthread_sigmask(int how, const sigset_t *set, sigset_t *old)
{
int ret;
if (how > 2U) return EINVAL;
return -__syscall(SYS_rt_sigprocmask, how, set, old, 8);
ret = -__syscall(SYS_rt_sigprocmask, how, set, old, 8);
if (!ret && old) {
if (sizeof old->__bits[0] == 8) {
old->__bits[0] &= ~0x380000000ULL;
} else {
old->__bits[0] &= ~0x80000000UL;
old->__bits[1] &= ~0x3UL;
}
}
return ret;
}