linux-kernel - Re: [PATCH v2] core, x86: Add user return notifiers

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Date:	Tue, 22 Sep 2009 20:06:57 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Avi Kivity <avi@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH v2] core, x86: Add user return notifiers

On Tue, 2009-09-22 at 16:32 +0200, Ingo Molnar wrote:

> Would be nice to convert some existing open-coded return-to-user-space 
> logic to this facility. One such candidate would be lockdep_sys_exit?

I don't really like lockdep_sys_exit() in such a call,
lockdep_sys_exit() is currently placed such that it will execute as the
last C code before returning to user-space.

Put it any earlier and you've got a window where people can leak a lock
to userspace undetected.

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