linux-kernel - Re: [PATCH] kvm: Initialize all struct members to avoid stack information leak

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Date:	Tue, 19 Jul 2011 16:12:58 +0200
From:	Juan Quintela <quintela@...hat.com>
To:	Marcus Meissner <meissner@...ell.com>
Cc:	avi@...hat.com, mtosatti@...hat.com, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, x86@...nel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marcus Meissner <meissner@...e.de>
Subject: Re: [PATCH] kvm: Initialize all struct members to avoid stack information leak

Marcus Meissner <meissner@...ell.com> wrote:
> Hi,
>
> Reported to us by Stephan Mueller of atsec.
>
> Several .pad struct members are not set to something, so they
> will leak stack content back to user space.
>
> Ciao, Marcus
>
> Reported-by: Stephan Mueller <smueller@...ec.com>
> Signed-off-by: Marcus Meissner <meissner@...e.de>
> ---
>  arch/x86/kvm/x86.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 77c9d86..621ffb6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -3002,6 +3002,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
>  	case KVM_GET_VCPU_EVENTS: {
>  		struct kvm_vcpu_events events;
>  
> +		memset(&events, 0, sizeof(events));
>  		kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
>  
>  		r = -EFAULT;

Looking at arch/x86/include/asm/kvm.h & arch/x86/kvm/x86.c I can't see
what pad fields are not initialized.  My reading is that everything is
initialized in kvm_vcpu_ioctl_x86_get_vcpu_events().  What field are you
refering to?

Later, Juan.
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