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Date: Thu, 30 Nov 2006 12:35:00 -0000
From: Avi Kivity <avi@...ranet.com>
To: kvm-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org, mingo@...e.hu, akpm@...l.org
Subject: [PATCH] KVM: Zero guest memory before use
This prevents an information leak from the host to the vmm and the guest.
Signed-off-by: Avi Kivity <avi@...ranet.com>
diff -X /home/avi/kvm/linux-2.6/Documentation/dontdiff --exclude=Makefile -ru /home/avi/kvm/linux-2.6/drivers/kvm/kvm_main.c /home/avi/kvm-release/kernel/kvm_main.c
--- linux-2.6/drivers/kvm/kvm_main.c 2006-11-30 10:59:57.000000000 +0200
+++ linux-2.6/drivers/kvm/kvm_main.c 2006-11-30 14:26:29.000000000 +0200
@@ -620,7 +620,8 @@
memset(new.phys_mem, 0, npages * sizeof(struct page *));
for (i = 0; i < npages; ++i) {
- new.phys_mem[i] = alloc_page(GFP_HIGHUSER);
+ new.phys_mem[i] = alloc_page(GFP_HIGHUSER
+ | __GFP_ZERO);
if (!new.phys_mem[i])
goto out_free;
}
-
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