Re: [PATCH v4] KVM: Fix stack-out-of-bounds read in write_mmio

[Paolo Bonzini]

On 15/12/2017 12:06, Marc Zyngier wrote:
> Assuming you address the above:
> 
> Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> Tested-by: Marc Zyngier <marc.zyngier@xxxxxxx>

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