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Message-ID: <CAFLxGvx2zc-qOYCzHEEzU6XY1JHqCqzU2+Kiq=e0YKfqqJWLnQ@mail.gmail.com> Date: Sun, 11 Mar 2012 19:37:28 +0100 From: richard -rw- weinberger <richard.weinberger@...il.com> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Oleg Nesterov <oleg@...hat.com>, Djalal Harouni <tixxdz@...ndz.org>, Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com, Andrew Morton <akpm@...ux-foundation.org>, Al Viro <viro@...iv.linux.org.uk>, Alexey Dobriyan <adobriyan@...il.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, Vasiliy Kulikov <segoon@...nwall.com>, Kees Cook <keescook@...omium.org>, Solar Designer <solar@...nwall.com>, WANG Cong <xiyou.wangcong@...il.com>, James Morris <james.l.morris@...cle.com>, linux-security-module@...r.kernel.org, linux-fsdevel@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>, Ingo Molnar <mingo@...e.hu>, Stephen Wilson <wilsons@...rt.ca>, "Jason A. Donenfeld" <Jason@...c4.com> Subject: Re: self_exec_id/parent_exec_id && CLONE_PARENT On Sun, Mar 11, 2012 at 7:02 PM, Linus Torvalds <torvalds@...ux-foundation.org> wrote: > On Sun, Mar 11, 2012 at 10:49 AM, Oleg Nesterov <oleg@...hat.com> wrote: >> >> I am also asking because the change above looks like the fix to me. >> The child must not control its ->exit_signal, it is the parent who >> decides which signal the child should use for notification. >> >> And to me, clone(CLONE_PARENT | SIGXXX) looks like a violation of >> rule above. > > SIGXXX is for doing things like AIO with threads, but it would never > be used together with CLONE_PARENT, that would be odd and wrong. > > So I think we could disallow that - or at least try. See if anybody > notices, and if it breaks anything. > UserModeLinux is using CLONE_PARENT | CLONE_FILES | SIGCHLD. Is this a problem? -- Thanks, //richard
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