linux-kernel - Re: siginfo pid not populated from ptrace?

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Date:   Tue, 27 Nov 2018 16:38:18 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Tycho Andersen <tycho@...ho.ws>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Oleg Nesterov <oleg@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: siginfo pid not populated from ptrace?

On Tue, Nov 27, 2018 at 3:21 PM, Tycho Andersen <tycho@...ho.ws> wrote:
> On Mon, Nov 12, 2018 at 12:24:43PM -0700, Tycho Andersen wrote:
>> On Mon, Nov 12, 2018 at 11:55:38AM -0700, Tycho Andersen wrote:
>> > I haven't manage to reproduce it on stock v4.20-rc2, unfortunately.
>>
>> Ok, now I have,
>>
>> seccomp_bpf.c:2736:global.syscall_restart:Expected getpid() (1493) == info._sifields._kill.si_pid (0)
>> global.syscall_restart: Test failed at step #22
>
> Seems like this is still happening on v4.20-rc4,
>
> [ RUN      ] global.syscall_restart
> seccomp_bpf.c:2736:global.syscall_restart:Expected getpid() (1901) == info._sifields._kill.si_pid (0)
> global.syscall_restart: Test failed at step #22

This fails every time for me -- is it still racey for you?

I'm attempting a bisect, hoping it doesn't _become_ racey for me. ;)

-- 
Kees Cook