From: Rich Felker Date: Sun, 3 Jun 2012 00:04:27 +0000 (-0400) Subject: remove implementation-reserved bits when saving signal mask X-Git-Tag: v0.9.1~5 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=40bd1726b6aa93a8311a77a1fec6da0fe0489fd0;p=oweals%2Fmusl.git 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. --- diff --git a/src/thread/pthread_sigmask.c b/src/thread/pthread_sigmask.c index 60a440b4..decc38f8 100644 --- a/src/thread/pthread_sigmask.c +++ b/src/thread/pthread_sigmask.c @@ -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; }