mirror of git://git.musl-libc.org/musl
remove implementation-reserved bits when saving signal mask
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.
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1e597a3e9b
commit
40bd1726b6
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@ -5,6 +5,16 @@
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int pthread_sigmask(int how, const sigset_t *set, sigset_t *old)
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int pthread_sigmask(int how, const sigset_t *set, sigset_t *old)
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{
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{
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int ret;
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if (how > 2U) return EINVAL;
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if (how > 2U) return EINVAL;
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return -__syscall(SYS_rt_sigprocmask, how, set, old, 8);
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ret = -__syscall(SYS_rt_sigprocmask, how, set, old, 8);
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if (!ret && old) {
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if (sizeof old->__bits[0] == 8) {
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old->__bits[0] &= ~0x380000000ULL;
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} else {
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old->__bits[0] &= ~0x80000000UL;
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old->__bits[1] &= ~0x3UL;
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}
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}
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return ret;
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}
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}
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