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Message-ID: <20120314185510.GA14172@redhat.com>
Date: Wed, 14 Mar 2012 19:55:10 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Djalal Harouni <tixxdz@...ndz.org>, Alan Cox <alan@...rguk.ukuu.org.uk>,
linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
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>,
Roland McGrath <roland@...k.frob.com>
Subject: [PATCH 0/1] (Was: self_exec_id/parent_exec_id && CLONE_PARENT)
On 03/11, Linus Torvalds 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.
>
> The rule about the Linux ABI is not that the ABI is set in stone. It's
> that we can't break any existing binaries. And *maybe* there are users
> of CLONE_PARENT and special signals, but it sounds unlikely and would
> probably confuse real programs. So feel free to just try it (early in
> the 3.4 merge window - not at this point, though).
OK, nobody seems to object.
Andrew, could you take this patch?
As for self_exec_id/parent_exec_id, this needs cleanups and fixes
in any case. But perhaps we can kill them after this change.
Oleg.
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