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

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Message-Id: <F7E17FF1-9EF5-46F5-8B3A-8F3050912000@suse.de>
Date:	Tue, 26 Jul 2011 19:38:10 +0200
From:	Alexander Graf <agraf@...e.de>
To:	Avi Kivity <avi@...hat.com>
Cc:	Vasiliy Kulikov <segooon@...il.com>,
	Jan Kiszka <jan.kiszka@....de>,
	kernel-janitors@...r.kernel.org,
	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: x86: fix information leak to userland


On 26.07.2011, at 19:24, Avi Kivity wrote:

> On 07/26/2011 08:05 PM, Alexander Graf wrote:
>> struct kvm_pit_state2 {
>>         struct kvm_pit_channel_state channels[3];
>>         __u32 flags;
>>         __u32 reserved[9];
>> };
>> 
>> So memset(&ps->reserved) would give you the a __u32 **, no? Same goes for all the other array sets in here. Or am I understanding some C logic wrong? :)
>> 
> 
> An address of an array is the array itself.

Ah, nice. So it's really a matter of taste then rather than functionality. Good to know :)


Alex

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