linux-kernel - Re: Possible bug kernel/seccomp.c

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Message-ID: <202103041200.54C6009@keescook>
Date:   Thu, 4 Mar 2021 12:00:56 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Hsuan-Chi Kuo <hckuo2@...inois.edu>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Possible bug kernel/seccomp.c

On Thu, Mar 04, 2021 at 01:14:16PM -0600, Hsuan-Chi Kuo wrote:
> cc mailing list.
> 
> On 3/4/21 1:10 PM, Hsuan-Chi Kuo wrote:
> > Hello,
> > 
> > Should this line be atomic_read(&caller->seccomp.filter_count));
> > 
> > https://elixir.bootlin.com/linux/latest/source/kernel/seccomp.c#L600
> > 
> > I think the desired behavior is to synchronize the filter count.

Yecch. Yeah, that's a bug. Thanks for noticing that! Can you send a
patch to fix it?

-- 
Kees Cook