You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
155 lines
5.2 KiB
155 lines
5.2 KiB
commit 40bade26d5bcbda3d21fb598c5063d9df62de966
|
|
Author: Florian Weimer <fweimer@redhat.com>
|
|
Date: Fri Oct 1 18:16:41 2021 +0200
|
|
|
|
nptl: pthread_kill must send signals to a specific thread [BZ #28407]
|
|
|
|
The choice between the kill vs tgkill system calls is not just about
|
|
the TID reuse race, but also about whether the signal is sent to the
|
|
whole process (and any thread in it) or to a specific thread.
|
|
|
|
This was caught by the openposix test suite:
|
|
|
|
LTP: openposix test suite - FAIL: SIGUSR1 is member of new thread pendingset.
|
|
<https://gitlab.com/cki-project/kernel-tests/-/issues/764>
|
|
|
|
Fixes commit 526c3cf11ee9367344b6b15d669e4c3cb461a2be ("nptl: Fix race
|
|
between pthread_kill and thread exit (bug 12889)").
|
|
|
|
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
|
|
Tested-by: Carlos O'Donell <carlos@redhat.com>
|
|
(cherry picked from commit eae81d70574e923ce3c59078b8df857ae192efa6)
|
|
|
|
diff --git a/nptl/pthread_kill.c b/nptl/pthread_kill.c
|
|
index a44dc8f2d9baa925..35bf1f973eaeda90 100644
|
|
--- a/nptl/pthread_kill.c
|
|
+++ b/nptl/pthread_kill.c
|
|
@@ -40,7 +40,7 @@ __pthread_kill_implementation (pthread_t threadid, int signo, int no_tid)
|
|
below. POSIX only guarantees delivery of a single signal,
|
|
which may not be the right one.) */
|
|
pid_t tid = INTERNAL_SYSCALL_CALL (gettid);
|
|
- int ret = INTERNAL_SYSCALL_CALL (kill, tid, signo);
|
|
+ int ret = INTERNAL_SYSCALL_CALL (tgkill, __getpid (), tid, signo);
|
|
return INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO (ret) : 0;
|
|
}
|
|
|
|
@@ -59,8 +59,6 @@ __pthread_kill_implementation (pthread_t threadid, int signo, int no_tid)
|
|
ret = no_tid;
|
|
else
|
|
{
|
|
- /* Using tgkill is a safety measure. pd->exit_lock ensures that
|
|
- the target thread cannot exit. */
|
|
ret = INTERNAL_SYSCALL_CALL (tgkill, __getpid (), pd->tid, signo);
|
|
ret = INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO (ret) : 0;
|
|
}
|
|
diff --git a/sysdeps/pthread/Makefile b/sysdeps/pthread/Makefile
|
|
index d4bd2d4e3ee6a496..0af9c59b425aefb1 100644
|
|
--- a/sysdeps/pthread/Makefile
|
|
+++ b/sysdeps/pthread/Makefile
|
|
@@ -121,6 +121,7 @@ tests += tst-cnd-basic tst-mtx-trylock tst-cnd-broadcast \
|
|
tst-pthread-setuid-loop \
|
|
tst-pthread_cancel-exited \
|
|
tst-pthread_cancel-select-loop \
|
|
+ tst-pthread-raise-blocked-self \
|
|
tst-pthread_kill-exited \
|
|
tst-pthread_kill-exiting \
|
|
# tests
|
|
diff --git a/sysdeps/pthread/tst-pthread-raise-blocked-self.c b/sysdeps/pthread/tst-pthread-raise-blocked-self.c
|
|
new file mode 100644
|
|
index 0000000000000000..128e1a6071c0b15f
|
|
--- /dev/null
|
|
+++ b/sysdeps/pthread/tst-pthread-raise-blocked-self.c
|
|
@@ -0,0 +1,92 @@
|
|
+/* Test that raise sends signal to current thread even if blocked.
|
|
+ Copyright (C) 2021 Free Software Foundation, Inc.
|
|
+ This file is part of the GNU C Library.
|
|
+
|
|
+ The GNU C Library is free software; you can redistribute it and/or
|
|
+ modify it under the terms of the GNU Lesser General Public
|
|
+ License as published by the Free Software Foundation; either
|
|
+ version 2.1 of the License, or (at your option) any later version.
|
|
+
|
|
+ The GNU C Library is distributed in the hope that it will be useful,
|
|
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
+ Lesser General Public License for more details.
|
|
+
|
|
+ You should have received a copy of the GNU Lesser General Public
|
|
+ License along with the GNU C Library; if not, see
|
|
+ <https://www.gnu.org/licenses/>. */
|
|
+
|
|
+#include <signal.h>
|
|
+#include <support/check.h>
|
|
+#include <support/xsignal.h>
|
|
+#include <support/xthread.h>
|
|
+#include <pthread.h>
|
|
+#include <unistd.h>
|
|
+
|
|
+/* Used to create a dummy thread ID distinct from all other thread
|
|
+ IDs. */
|
|
+static void *
|
|
+noop (void *ignored)
|
|
+{
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+static volatile pthread_t signal_thread;
|
|
+
|
|
+static void
|
|
+signal_handler (int signo)
|
|
+{
|
|
+ signal_thread = pthread_self ();
|
|
+}
|
|
+
|
|
+/* Used to ensure that waiting_thread has launched and can accept
|
|
+ signals. */
|
|
+static pthread_barrier_t barrier;
|
|
+
|
|
+static void *
|
|
+waiting_thread (void *ignored)
|
|
+{
|
|
+ xpthread_barrier_wait (&barrier);
|
|
+ pause ();
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+static int
|
|
+do_test (void)
|
|
+{
|
|
+ xsignal (SIGUSR1, signal_handler);
|
|
+ xpthread_barrier_init (&barrier, NULL, 2);
|
|
+
|
|
+ /* Distinct thread ID value to */
|
|
+ pthread_t dummy = xpthread_create (NULL, noop, NULL);
|
|
+ signal_thread = dummy;
|
|
+
|
|
+ pthread_t helper = xpthread_create (NULL, waiting_thread, NULL);
|
|
+
|
|
+ /* Make sure that the thread is running. */
|
|
+ xpthread_barrier_wait (&barrier);
|
|
+
|
|
+ /* Block signals on this thread. */
|
|
+ sigset_t set;
|
|
+ sigfillset (&set);
|
|
+ xpthread_sigmask (SIG_BLOCK, &set, NULL);
|
|
+
|
|
+ /* Send the signal to this thread. It must not be delivered. */
|
|
+ raise (SIGUSR1);
|
|
+ TEST_VERIFY (signal_thread == dummy);
|
|
+
|
|
+ /* Wait a bit to give a chance for signal delivery (increases
|
|
+ chances of failure with bug 28407). */
|
|
+ usleep (50 * 1000);
|
|
+
|
|
+ /* Unblocking should cause synchronous delivery of the signal. */
|
|
+ xpthread_sigmask (SIG_UNBLOCK, &set, NULL);
|
|
+ TEST_VERIFY (signal_thread == pthread_self ());
|
|
+
|
|
+ xpthread_cancel (helper);
|
|
+ xpthread_join (helper);
|
|
+ xpthread_join (dummy);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+#include <support/test-driver.c>
|