linux-kernel - Re: [PATCH 0/1] *** Fix kill(-1,s) returning 0 on 0 kills ***

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Date:   Tue, 22 Nov 2022 09:15:42 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Petr Skocik <pskocik@...il.com>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Marco Elver <elver@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] *** Fix kill(-1,s) returning 0 on 0 kills ***

On Tue, Nov 22, 2022 at 05:12:40PM +0100, Petr Skocik wrote:
> Hi. I've never sent a kernel patch before but this one seemed trivial,
> so I thought I'd give it a shot.
> 
> My issue: kill(-1,s) on Linux doesn't return -ESCHR when it has nothing
> to kill.

It looks like LTP already tests for this, and gets -ESRCH?
https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/containers/pidns/pidns10.c

Does it still pass with your change?

-- 
Kees Cook