linux-kernel - Re: [RFC][PATCH 0/2] exec: Fixing ptrace'd mulit-threaded hang

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Message-ID: <20170402153828.GB12637@redhat.com>
Date:   Sun, 2 Apr 2017 17:38:28 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Aleksa Sarai <asarai@...e.com>,
        Andy Lutomirski <luto@...capital.net>,
        Attila Fazekas <afazekas@...hat.com>,
        Jann Horn <jann@...jh.net>, Kees Cook <keescook@...omium.org>,
        Michal Hocko <mhocko@...nel.org>,
        Ulrich Obergfell <uobergfe@...hat.com>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [RFC][PATCH 0/2] exec: Fixing ptrace'd mulit-threaded hang

On 04/01, Eric W. Biederman wrote:
>
> These patches only handle the case when sighand_struct is not
> shared between different multi-threaded processes.

Ah, I didn't read 0/2 when looked at 2/2, so at least you documented this.

> The general
> case is solvable but that is a quite a bit more code.

I don't think so, please see my reply to 2/2.

Oleg.