linux-kernel - [PATCH] KVM: Zero guest memory before use

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Message-Id: <20061130123500.9440E25017B@cleopatra.q>
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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