linux-kernel - siginfo pid not populated from ptrace?

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Date:   Mon, 12 Nov 2018 10:11:44 -0700
From:   Tycho Andersen <tycho@...ho.ws>
To:     Kees Cook <keescook@...omium.org>, Oleg Nesterov <oleg@...hat.com>
Cc:     linux-kernel@...r.kernel.org
Subject: siginfo pid not populated from ptrace?

Hi Oleg,

I've been running some tests on my seccomp series, and in one of the
tests on v4.20-rc2, I noticed,

[ RUN      ] global.syscall_restart
seccomp_bpf.c:2784:global.syscall_restart:Expected getpid() (1492) == info._sifields._kill.si_pid (0)
global.syscall_restart: Test failed at step #22

which seems unrelated to my series (the kernel was stock v4.20 with my
patches on top).

I've been running a lot of tests, and only seen this once, so it seems
like a fairly rare race. I tried to look through the code but didn't
see anything obvious. Thoughts?

Tycho