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Cygwin: sigpending: don't report pending signals for other threads 

The sigpending mechanism failed to check if the pending signal was a
process-wide signal, or a signal for the curent thread.  Fix that by
adding a matching conditional to wait_sig's __SIGPENDING code.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2019-07-12 17:18:48 +02:00
parent 948d40e482
commit bae987be12
2 changed files with 10 additions and 2 deletions
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3
winsup/cygwin/release/3.1.0
View File

@ -37,3 +37,6 @@ Bug Fixes
- Fix a timerfd deadlock. - Fix a timerfd deadlock.
Addresses: https://cygwin.com/ml/cygwin/2019-06/msg00096.html Addresses: https://cygwin.com/ml/cygwin/2019-06/msg00096.html
- Fix sigpending() incorrectly returning signals for unrelated threads.
Addresses: https://cygwin.com/ml/cygwin/2019-07/msg00051.html

5
winsup/cygwin/sigproc.cc
View File

@ -1335,8 +1335,13 @@ wait_sig (VOID *)
*pack.mask = 0; *pack.mask = 0;
tl_entry = cygheap->find_tls (pack.sigtls); tl_entry = cygheap->find_tls (pack.sigtls);
while ((q = q->next)) while ((q = q->next))
{
/* Skip thread-specific signals for other threads. */
if (q->sigtls && pack.sigtls != q->sigtls)
continue;
if (pack.sigtls->sigmask & (bit = SIGTOMASK (q->si.si_signo))) if (pack.sigtls->sigmask & (bit = SIGTOMASK (q->si.si_signo)))
*pack.mask |= bit; *pack.mask |= bit;
}
cygheap->unlock_tls (tl_entry); cygheap->unlock_tls (tl_entry);
} }
break; break;