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selftest/pidfd: add test for thread-group leader pidfd open for thread

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Verify that we report ENOENT when userspace tries to create a
thread-group leader pidfd for a thread pidfd that isn't a thread-group
leader.

Link: https://lore.kernel.org/r/20250403-work-pidfd-fixes-v1-4-a123b6ed6716@kernel.org
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-04-03 16:09:04 +02:00
parent 8cf4b738f6
commit 4fc3f73c16
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1 changed files with 1 additions and 0 deletions
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tools/testing/selftests/pidfd/pidfd_info_test.c
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@ -299,6 +299,7 @@ TEST_F(pidfd_info, thread_group)
/* Opening a thread as a thread-group leader must fail. */
pidfd_thread = sys_pidfd_open(pid_thread, 0);
ASSERT_LT(pidfd_thread, 0);
ASSERT_EQ(errno, ENOENT);
/* Opening a thread as a PIDFD_THREAD must succeed. */
pidfd_thread = sys_pidfd_open(pid_thread, PIDFD_THREAD);