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Commit 629f8205 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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
parents 0572d766 30b692d3

kernel/exit.c

+3 −2
Original line number Diff line number Diff line
@@ -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))

kernel/signal.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

}

tools/testing/selftests/pidfd/pidfd_test.c

+1 −5
Original line number Diff line number Diff line
@@ -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",