linux-kernel - Re: 2.6.24-rc1-gb4f5550 oops

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Date:	Wed, 14 Nov 2007 20:48:40 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Grant Wilson <grant.wilson@....co.uk>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc1-gb4f5550 oops

On 11/14, Srivatsa Vaddagiri wrote:
>
> On Wed, Nov 14, 2007 at 06:17:08PM +0300, Oleg Nesterov wrote:
> > Suppose that old user_struct/task_group is freed/reused, and the task does
> 
> Shouldn't this old user actually be the root user_struct?

Well, the S_ISUID application can switch ->user from !root_user (note that
setuid exec doesn't change ->user), and we also have CAP_SETUID...

But yes, I agree, this all is very unlikely.

Oleg.

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