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

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Date:	Mon, 1 Nov 2010 15:19:37 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Vasiliy Kulikov <segooon@...il.com>
Cc:	Jan Kiszka <jan.kiszka@....de>, kernel-janitors@...r.kernel.org,
	Avi Kivity <avi@...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: x86: fix information leak to userland

On Sat, Oct 30, 2010 at 10:54:47PM +0400, Vasiliy Kulikov wrote:
> Structures kvm_vcpu_events, kvm_debugregs, kvm_pit_state2 and
> kvm_clock_data are copied to userland with some padding and reserved
> fields unitialized.  It leads to leaking of contents of kernel stack
> memory.  We have to initialize them to zero.
> 
> In patch v1 Jan Kiszka suggested to fill reserved fields with zeros
> instead of memset'ting the whole struct.  It makes sense as these
> fields are explicitly marked as padding.  No more fields need zeroing.
> 
> Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
> ---
>  Compile tesed only.
> 
>  arch/x86/kvm/x86.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)

Applied, thanks.

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