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

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Message-ID: <17d27b8d-908b-a740-1d2d-e92a8507f25b@redhat.com>
Date:   Mon, 18 Dec 2017 12:55:05 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Marc Zyngier <marc.zyngier@....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 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",

Thanks,

Paolo