linux-kernel - Re: + syscalls-x86-add-__nr_kcmp-syscall-v8.patch added to -mm tree

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Message-ID: <20120215200533.GQ1894@moon>
Date:	Thu, 16 Feb 2012 00:05:33 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andrey Vagin <avagin@...nvz.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Glauber Costa <glommer@...allels.com>,
	Andi Kleen <andi@...stfloor.org>, Tejun Heo <tj@...nel.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Alexey Dobriyan <adobriyan@...il.com>, Valdis.Kletnieks@...edu,
	Michal Marek <mmarek@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: + syscalls-x86-add-__nr_kcmp-syscall-v8.patch added to -mm tree

On Wed, Feb 15, 2012 at 11:57:33PM +0400, Vasiliy Kulikov wrote:
> > 
> > This makes me scratch the head ;) I think ptrace_may_access (or
> > some other security test) should remain since it's somehow weird
> > if non-root task will be able to find objects order from privileged
> > task. Thus I need to find a way how to handle execve(setuid_app).
> > Need to think...
> 
> Look at fs/proc/base.c:lock_trace() - it locks ->cred_guard_mutex
> for the whole period of time when it uses a resource.

Yup, thanks Vasiliy! I've just found cred_guard_mutex in
install_exec_creds. Now I'm thinking if this is what we
need here ;)

	Cyrill
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