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

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Message-ID: <CAGXu5j+a3kuS38gfB5tswYiLvnpLT3ZYzDdxMX5+F9Y-XG6r0g@mail.gmail.com>
Date:   Thu, 6 Dec 2018 14:55:45 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Tycho Andersen <tycho@...ho.ws>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Oleg Nesterov <oleg@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: siginfo pid not populated from ptrace?

On Thu, Dec 6, 2018 at 2:43 PM Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> Kees Cook <keescook@...omium.org> writes:
> > What should we do for v4.20? I need to have the selftests actually
> > passing. :)
>
> For v4.20 we need to do one of two things.
> 1) Present a plausible case that someone will could care about,
>    we document it in the commit we can perform my earlier partial revert.

If SIGSTOP si_pid can't be used to determine who sent the signal
reliably even before, then I'm guessing we'll never see a real-world
case where this matters.

> 2) Remove the sanity check seccomp_bpf.c
>
> I really just want to ensure we have clear reasoning here.

I'll remove it for now and add a link to this conversation, in case
anyone else goes looking.

-Kees

-- 
Kees Cook