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Date:   Mon, 20 Feb 2017 16:36:30 +0100
From:   Oleg Nesterov <>
To:     "Eric W. Biederman" <>
Cc:     Andrew Morton <>,
        Mika Penttilä <>,
        Aleksa Sarai <>,
        Andy Lutomirski <>,
        Attila Fazekas <>,
        Jann Horn <>, Kees Cook <>,
        Michal Hocko <>,
        Ulrich Obergfell <>,
Subject: Re: [PATCH V2 1/2] exec: don't wait for zombie threads with
        cred_guard_mutex held

On 02/20, Oleg Nesterov wrote:
> Again, this needs some work. For example check_unsafe_exec() assumes
> it can't race with another thread, see 9e00cdb091b008cb3c78192651180
> "exec:check_unsafe_exec: kill the dead -EAGAIN and clear_in_exec logic".
> But this looks solvable.

Forgot to mention... plus check_unsafe_exec() checks ptrace, this is
another reason why we can't simply shift mutex_lock(cred_guard_mutex)


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