forked from rpms/glibc
280 lines
8.8 KiB
Diff
280 lines
8.8 KiB
Diff
commit 3abf3bd4edc86fb28c099cc85203cb46a811e0b8
|
|
Author: Florian Weimer <fweimer@redhat.com>
|
|
Date: Mon Sep 13 11:06:08 2021 +0200
|
|
|
|
nptl: pthread_kill, pthread_cancel should not fail after exit (bug 19193)
|
|
|
|
This closes one remaining race condition related to bug 12889: if
|
|
the thread already exited on the kernel side, returning ESRCH
|
|
is not correct because that error is reserved for the thread IDs
|
|
(pthread_t values) whose lifetime has ended. In case of a
|
|
kernel-side exit and a valid thread ID, no signal needs to be sent
|
|
and cancellation does not have an effect, so just return 0.
|
|
|
|
sysdeps/pthread/tst-kill4.c triggers undefined behavior and is
|
|
removed with this commit.
|
|
|
|
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
|
|
(cherry picked from commit 8af8456004edbab71f8903a60a3cae442cf6fe69)
|
|
|
|
diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c
|
|
index cc25ff21f364e8a4..9bac6e3b76a20312 100644
|
|
--- a/nptl/pthread_cancel.c
|
|
+++ b/nptl/pthread_cancel.c
|
|
@@ -62,10 +62,11 @@ __pthread_cancel (pthread_t th)
|
|
{
|
|
volatile struct pthread *pd = (volatile struct pthread *) th;
|
|
|
|
- /* Make sure the descriptor is valid. */
|
|
- if (INVALID_TD_P (pd))
|
|
- /* Not a valid thread handle. */
|
|
- return ESRCH;
|
|
+ if (pd->tid == 0)
|
|
+ /* The thread has already exited on the kernel side. Its outcome
|
|
+ (regular exit, other cancelation) has already been
|
|
+ determined. */
|
|
+ return 0;
|
|
|
|
static int init_sigcancel = 0;
|
|
if (atomic_load_relaxed (&init_sigcancel) == 0)
|
|
diff --git a/nptl/pthread_kill.c b/nptl/pthread_kill.c
|
|
index f79a2b26fc7f72e5..5d4c86f9205a6fb5 100644
|
|
--- a/nptl/pthread_kill.c
|
|
+++ b/nptl/pthread_kill.c
|
|
@@ -46,7 +46,12 @@ __pthread_kill_internal (pthread_t threadid, int signo)
|
|
? INTERNAL_SYSCALL_ERRNO (val) : 0);
|
|
}
|
|
else
|
|
- val = ESRCH;
|
|
+ /* The kernel reports that the thread has exited. POSIX specifies
|
|
+ the ESRCH error only for the case when the lifetime of a thread
|
|
+ ID has ended, but calling pthread_kill on such a thread ID is
|
|
+ undefined in glibc. Therefore, do not treat kernel thread exit
|
|
+ as an error. */
|
|
+ val = 0;
|
|
|
|
return val;
|
|
}
|
|
diff --git a/sysdeps/pthread/Makefile b/sysdeps/pthread/Makefile
|
|
index 42f9fc507263657d..dedfa0d290da4949 100644
|
|
--- a/sysdeps/pthread/Makefile
|
|
+++ b/sysdeps/pthread/Makefile
|
|
@@ -89,7 +89,7 @@ tests += tst-cnd-basic tst-mtx-trylock tst-cnd-broadcast \
|
|
tst-join8 tst-join9 tst-join10 tst-join11 tst-join12 tst-join13 \
|
|
tst-join14 tst-join15 \
|
|
tst-key1 tst-key2 tst-key3 tst-key4 \
|
|
- tst-kill1 tst-kill2 tst-kill3 tst-kill4 tst-kill5 tst-kill6 \
|
|
+ tst-kill1 tst-kill2 tst-kill3 tst-kill5 tst-kill6 \
|
|
tst-locale1 tst-locale2 \
|
|
tst-memstream \
|
|
tst-mutex-errorcheck tst-mutex1 tst-mutex2 tst-mutex3 tst-mutex4 \
|
|
@@ -118,6 +118,9 @@ tests += tst-cnd-basic tst-mtx-trylock tst-cnd-broadcast \
|
|
tst-unload \
|
|
tst-unwind-thread \
|
|
tst-pt-vfork1 tst-pt-vfork2 tst-vfork1x tst-vfork2x \
|
|
+ tst-pthread_cancel-exited \
|
|
+ tst-pthread_kill-exited \
|
|
+ # tests
|
|
|
|
tests-time64 := \
|
|
tst-abstime-time64 \
|
|
diff --git a/sysdeps/pthread/tst-kill4.c b/sysdeps/pthread/tst-kill4.c
|
|
deleted file mode 100644
|
|
index 9563939792b96ebd..0000000000000000
|
|
--- a/sysdeps/pthread/tst-kill4.c
|
|
+++ /dev/null
|
|
@@ -1,90 +0,0 @@
|
|
-/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
|
|
- This file is part of the GNU C Library.
|
|
- Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
|
|
-
|
|
- 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 <errno.h>
|
|
-#include <pthread.h>
|
|
-#include <signal.h>
|
|
-#include <stdio.h>
|
|
-#include <stdlib.h>
|
|
-#include <unistd.h>
|
|
-
|
|
-
|
|
-static void *
|
|
-tf (void *a)
|
|
-{
|
|
- return NULL;
|
|
-}
|
|
-
|
|
-
|
|
-int
|
|
-do_test (void)
|
|
-{
|
|
- pthread_attr_t at;
|
|
- if (pthread_attr_init (&at) != 0)
|
|
- {
|
|
- puts ("attr_create failed");
|
|
- exit (1);
|
|
- }
|
|
-
|
|
- /* Limit thread stack size, because if it is too large, pthread_join
|
|
- will free it immediately rather than put it into stack cache. */
|
|
- if (pthread_attr_setstacksize (&at, 2 * 1024 * 1024) != 0)
|
|
- {
|
|
- puts ("setstacksize failed");
|
|
- exit (1);
|
|
- }
|
|
-
|
|
- pthread_t th;
|
|
- if (pthread_create (&th, &at, tf, NULL) != 0)
|
|
- {
|
|
- puts ("create failed");
|
|
- exit (1);
|
|
- }
|
|
-
|
|
- pthread_attr_destroy (&at);
|
|
-
|
|
- if (pthread_join (th, NULL) != 0)
|
|
- {
|
|
- puts ("join failed");
|
|
- exit (1);
|
|
- }
|
|
-
|
|
- /* The following only works because we assume here something about
|
|
- the implementation. Namely, that the memory allocated for the
|
|
- thread descriptor is not going away, that the TID field is
|
|
- cleared and therefore the signal is sent to process 0, and that
|
|
- we can savely assume there is no other process with this ID at
|
|
- that time. */
|
|
- int e = pthread_kill (th, 0);
|
|
- if (e == 0)
|
|
- {
|
|
- puts ("pthread_kill succeeded");
|
|
- exit (1);
|
|
- }
|
|
- if (e != ESRCH)
|
|
- {
|
|
- puts ("pthread_kill didn't return ESRCH");
|
|
- exit (1);
|
|
- }
|
|
-
|
|
- return 0;
|
|
-}
|
|
-
|
|
-
|
|
-#define TEST_FUNCTION do_test ()
|
|
-#include "../test-skeleton.c"
|
|
diff --git a/sysdeps/pthread/tst-pthread_cancel-exited.c b/sysdeps/pthread/tst-pthread_cancel-exited.c
|
|
new file mode 100644
|
|
index 0000000000000000..811c9bee07ab2638
|
|
--- /dev/null
|
|
+++ b/sysdeps/pthread/tst-pthread_cancel-exited.c
|
|
@@ -0,0 +1,45 @@
|
|
+/* Test that pthread_kill succeeds for an exited thread.
|
|
+ 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/>. */
|
|
+
|
|
+/* This test verifies that pthread_kill returns 0 (and not ESRCH) for
|
|
+ a thread that has exited on the kernel side. */
|
|
+
|
|
+#include <stddef.h>
|
|
+#include <support/support.h>
|
|
+#include <support/xthread.h>
|
|
+
|
|
+static void *
|
|
+noop_thread (void *closure)
|
|
+{
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+static int
|
|
+do_test (void)
|
|
+{
|
|
+ pthread_t thr = xpthread_create (NULL, noop_thread, NULL);
|
|
+
|
|
+ support_wait_for_thread_exit ();
|
|
+
|
|
+ xpthread_cancel (thr);
|
|
+ xpthread_join (thr);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+#include <support/test-driver.c>
|
|
diff --git a/sysdeps/pthread/tst-pthread_kill-exited.c b/sysdeps/pthread/tst-pthread_kill-exited.c
|
|
new file mode 100644
|
|
index 0000000000000000..7575fb6d58cae99c
|
|
--- /dev/null
|
|
+++ b/sysdeps/pthread/tst-pthread_kill-exited.c
|
|
@@ -0,0 +1,46 @@
|
|
+/* Test that pthread_kill succeeds for an exited thread.
|
|
+ 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/>. */
|
|
+
|
|
+/* This test verifies that pthread_kill returns 0 (and not ESRCH) for
|
|
+ a thread that has exited on the kernel side. */
|
|
+
|
|
+#include <signal.h>
|
|
+#include <stddef.h>
|
|
+#include <support/support.h>
|
|
+#include <support/xthread.h>
|
|
+
|
|
+static void *
|
|
+noop_thread (void *closure)
|
|
+{
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+static int
|
|
+do_test (void)
|
|
+{
|
|
+ pthread_t thr = xpthread_create (NULL, noop_thread, NULL);
|
|
+
|
|
+ support_wait_for_thread_exit ();
|
|
+
|
|
+ xpthread_kill (thr, SIGUSR1);
|
|
+ xpthread_join (thr);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+#include <support/test-driver.c>
|