Re: [kvm-devel] [PATCH] KVM: MMU: Fix host memory corruption on i386 with >= 4GB ram
- From: Ingo Molnar <mingo@xxxxxxx>
- Date: Sun, 11 Mar 2007 11:33:34 +0100
* Avi Kivity <avi@xxxxxxxxxxxx> wrote:
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().
Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
i have tested this, albeit with less than 4GB RAM.
Acked-by: Ingo Molnar <mingo@xxxxxxx>
Ingo
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- References:
- [PATCH 0/2] KVM: More fixes for 2.6.21-rc3
- From: Avi Kivity
- [PATCH] KVM: MMU: Fix host memory corruption on i386 with >= 4GB ram
- From: Avi Kivity
- [PATCH 0/2] KVM: More fixes for 2.6.21-rc3
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