linux-kernel - Re: [PATCH] kvm: fix poison overwritten caused by using wrong xstate size

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Date:	Sun, 15 Aug 2010 14:08:04 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiaotian Feng <dfeng@...hat.com>
CC:	x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Brian Gerst <brgerst@...il.com>,
	Robert Richter <robert.richter@....com>,
	Sheng Yang <sheng@...ux.intel.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [PATCH] kvm: fix poison overwritten caused by using wrong xstate
 size

  On 08/13/2010 10:19 AM, Xiaotian Feng wrote:
> fpu.state is allocated from task_xstate_cachep, the size of task_xstate_cachep
> is xstate_size. xstate_size is set from cpuid instruction, which is often
> smaller than sizeof(struct xsave_struct). kvm is using sizeof(struct xsave_struct)
> to fill in/out fpu.state.xsave, as what we allocated for fpu.state is
> xstate_size, kernel will write out of memory and caused poison/redzone/padding
> overwritten warnings.

Thanks, applied.

-- 
error compiling committee.c: too many arguments to function

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