linux-kernel - Re: [PATCH v2] x86: kvm: fix information leak to userland

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Date:	Sat, 30 Oct 2010 17:46:10 +0200
From:	Jan Kiszka <jan.kiszka@....de>
To:	Vasiliy Kulikov <segooon@...il.com>
CC:	kernel-janitors@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86: kvm: fix information leak to userland

Am 30.10.2010 17:31, Vasiliy Kulikov wrote:
> On Sat, Oct 30, 2010 at 16:34 +0200, Jan Kiszka wrote:
>> Am 30.10.2010 16:11, Vasiliy Kulikov wrote:
>>> Structure kvm_ppc_pvinfo is copied to userland with pad field
>>> unitialized.  Structure kvm_clock_data is copied to userland with
>>> flags and pad fields unitialized.  It leads to leaking of contents
>>> of kernel stack memory.
>>
>> This description only partially matches your patch, please fix.
> 
> What do you mean?  Two structures are copied with some fields with old
> stack values.  Smth valuable else?

I mean you aren't touching ppc code in this patch, but you are fixing
more than just the kvm_clock interface.

Jan


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