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signal: Only handle on NSIG signals on signal functions (BZ #25657)

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The upper bits of the sigset_t s not fully initialized in the signal
mask calls that return information from kernel (sigprocmask,
sigpending, and pthread_sigmask), since the exported sigset_t size
(1024 bits) is larger than Linux support one (64 or 128 bits).
It might make sigisemptyset/sigorset/sigandset fail if the mask
is filled prior the call.

This patch changes the internal signal function to handle up to
supported Linux signal number (_NSIG), the remaining bits are
untouched.

Checked on x86_64-linux-gnu and i686-linux-gnu.
This commit is contained in:
Adhemerval Zanella
2020-03-12 09:50:19 -03:00
parent 2f6fa80147
commit 566e10aa72
8 changed files with 238 additions and 86 deletions
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6
sysdeps/unix/sysv/linux/sigpending.c
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@ -15,13 +15,9 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <sigsetops.h>
/* Change the set of blocked signals to SET,
wait until a signal arrives, and restore the set of blocked signals. */