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for-linus-20190730

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Merge tag 'for-linus-20190730' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux

Pull pidfd fixes from Christian Brauner:
 "This makes setting the exit_state in exit_notify() consistent after
  fixing the pidfd polling race pre-rc1. Related to the race fix, this
  adds a WARN_ON() to do_notify_pidfd() to catch any future exit_state
  races.

  Last, this removes an obsolete comment from the pidfd tests"

* tag 'for-linus-20190730' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
  exit: make setting exit_state consistent
  pidfd: Add warning if exit_state is 0 during notification
  pidfd: remove obsolete comments from test
This commit is contained in:
Linus Torvalds 2019-07-30 13:25:14 -07:00
commit 629f8205a6
3 changed files with 5 additions and 7 deletions
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5
kernel/exit.c
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@ -734,9 +734,10 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
autoreap = true;
}
tsk->exit_state = autoreap ? EXIT_DEAD : EXIT_ZOMBIE;
if (tsk->exit_state == EXIT_DEAD)
if (autoreap) {
tsk->exit_state = EXIT_DEAD;
list_add(&tsk->ptrace_entry, &dead);
}
/* mt-exec, de_thread() is waiting for group leader */
if (unlikely(tsk->signal->notify_count < 0))

1
kernel/signal.c
View File

@ -1885,6 +1885,7 @@ static void do_notify_pidfd(struct task_struct *task)
{
struct pid *pid;
WARN_ON(task->exit_state == 0);
pid = task_pid(task);
wake_up_all(&pid->wait_pidfd);
}

6
tools/testing/selftests/pidfd/pidfd_test.c
View File

@ -339,13 +339,9 @@ static int test_pidfd_send_signal_syscall_support(void)
ret = sys_pidfd_send_signal(pidfd, 0, NULL, 0);
if (ret < 0) {
/*
* pidfd_send_signal() will currently return ENOSYS when
* CONFIG_PROC_FS is not set.
*/
if (errno == ENOSYS)
ksft_exit_skip(
"%s test: pidfd_send_signal() syscall not supported (Ensure that CONFIG_PROC_FS=y is set)\n",
"%s test: pidfd_send_signal() syscall not supported\n",
test_name);
ksft_exit_fail_msg("%s test: Failed to send signal\n",