From: Avi Kivity <avi@qumranet.com>
Date: Fri, 9 Mar 2007 11:04:31 +0000 (+0200)
Subject: KVM: MMU: Fix host memory corruption on i386 with >= 4GB ram
X-Git-Tag: v2.6.21-rc5~66^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=27aba76615eeb36af84118e8ea6d35ffa51fd1e3;p=pandora-kernel.git

KVM: MMU: Fix host memory corruption on i386 with >= 4GB ram

PAGE_MASK is an unsigned long, so using it to mask physical addresses on
i386 (which are 64-bit wide) leads to truncation.  This can result in
page->private of unrelated memory pages being modified, with disasterous
results.

Fix by not using PAGE_MASK for physical addresses; instead calculate
the correct value directly from PAGE_SIZE.  Also fix a similar BUG_ON().

Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---

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