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Date: Mon, 20 Feb 2017 16:36:30 +0100 From: Oleg Nesterov <oleg@...hat.com> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Mika Penttilä <mika.penttila@...tfour.com>, 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 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) later. Oleg.
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