linux-kernel - Re: [PATCH v2 3/4] seccomp: add a way to get a listener fd from ptrace

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Message-ID: <20180517155932.GC3831@cisco>
Date:   Thu, 17 May 2018 09:59:32 -0600
From:   Tycho Andersen <tycho@...ho.ws>
To:     Oleg Nesterov <oleg@...hat.com>
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 3/4] seccomp: add a way to get a listener fd from
 ptrace

On Thu, May 17, 2018 at 09:57:33AM -0600, Tycho Andersen wrote:
> On Thu, May 17, 2018 at 05:41:39PM +0200, Oleg Nesterov wrote:
> > and since init_listener() does __get_seccomp_filter() on sucess, it is needed
> > uncondtitionally?
> 
> I think there does need to be a __get_seccomp_filter() on success in
> init_listener(), because it's paired with the __put_seccomp_filter in
> seccomp_notify_release. The listener fd has a reference to the filter,
> and that shouldn't go away until after the fd is freed.

Oh, sorry. I see what you meant here. Yes, it should be unconditional.

Tycho