Re: [PATCH net] selftests: af_unix: verify SCM_PIDFD pidfd in cmsg_check_dead()

Jakub Kicinski <[email protected]> Mon, 17 Aug 2026 08:41:23 -0700

Newsgroups	org.kernel.vger.linux-kselftest,org.kernel.vger.netdev
Message-ID	<[email protected]>

On Mon, 17 Aug 2026 14:11:21 +0800 Lei Zhu wrote:
> The cmsg_check_dead() function receives an expected_pid parameter but never
> actually verifies that the pidfd received via SCM_PIDFD corresponds to that
> PID. It only checks the child's exit code via PIDFD_GET_INFO.

this breaks the test:

  (scm_pidfd.c:282: errno: None) wrong SCM_PIDFD -1 != <PID>

If you want to improve the test please repost this patch in 2 weeks
after the merge window. This patch should not carry the Fixes tag.