linux-kernel - Re: [PATCH v2 1/4] seccomp: add a return code to trap to userspace

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Message-ID: <20180517154637.GC8586@redhat.com>
Date:   Thu, 17 May 2018 17:46:37 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Tycho Andersen <tycho@...ho.ws>
Cc:     linux-kernel@...r.kernel.org,
        containers@...ts.linux-foundation.org,
        Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...capital.net>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Tyler Hicks <tyhicks@...onical.com>,
        Akihiro Suda <suda.akihiro@....ntt.co.jp>,
        "Tobin C . Harding" <me@...in.cc>
Subject: Re: [PATCH v2 1/4] seccomp: add a return code to trap to userspace

On 05/17, Tycho Andersen wrote:
>
> > From lockdep pov this loop tries to take the same lock twice or more, it shoul
> > complain.
>
> I didn't, but I guess that's because it's not trying to take the same lock
> twice -- the pointer cur is changing in the loop.

Yes, I see. But this is the same lock for lockdep, it has the same class.

Oleg.