linux-kernel - Re: [PATCH v4] KVM: Fix stack-out-of-bounds read in write

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Date:   Mon, 18 Dec 2017 12:06:09 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>,
        Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [PATCH v4] KVM: Fix stack-out-of-bounds read in write_mmio

On 18/12/17 11:55, Paolo Bonzini wrote:
> On 15/12/2017 12:06, Marc Zyngier wrote:
>> Assuming you address the above:
>>
>> Reviewed-by: Marc Zyngier <marc.zyngier@....com>
>> Tested-by: Marc Zyngier <marc.zyngier@....com>
> 
> Done as follows:
> 
> diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
> index dfd21708694f..0a016bd14c2d 100644
> --- a/include/trace/events/kvm.h
> +++ b/include/trace/events/kvm.h
> @@ -227,7 +227,8 @@
>  		__entry->gpa		= gpa;
>  		__entry->val = 0;
>  		if (val)
> -			memcpy(&__entry->val, val, min(8, len));
> +			memcpy(&__entry->val, val,
> +			       min_t(u32, sizeof(__entry->val), len));
>  	),
>  
>  	TP_printk("mmio %s len %u gpa 0x%llx val 0x%llx",
> 

Looks good to me.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...