This is a note to let you know that I've just added the patch titled
intel-iommu: fix off-by-one in pagetable freeing
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
intel-iommu-fix-off-by-one-in-pagetable-freeing.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 08336fd218e087cc4fcc458e6b6dcafe8702b098 Mon Sep 17 00:00:00 2001
From: Alex Williamson <alex.williamson@xxxxxxxxxx>
Date: Tue, 21 Jan 2014 15:48:18 -0800
Subject: intel-iommu: fix off-by-one in pagetable freeing
From: Alex Williamson <alex.williamson@xxxxxxxxxx>
commit 08336fd218e087cc4fcc458e6b6dcafe8702b098 upstream.
dma_pte_free_level() has an off-by-one error when checking whether a pte
is completely covered by a range. Take for example the case of
attempting to free pfn 0x0 - 0x1ff, ie. 512 entries covering the first
2M superpage.
The level_size() is 0x200 and we test:
static void dma_pte_free_level(...
...
if (!(0 > 0 || 0x1ff < 0 + 0x200)) {
...
}
Clearly the 2nd test is true, which means we fail to take the branch to
clear and free the pagetable entry. As a result, we're leaking
pagetables and failing to install new pages over the range.
This was found with a PCI device assigned to a QEMU guest using vfio-pci
without a VGA device present. The first 1M of guest address space is
mapped with various combinations of 4K pages, but eventually the range
is entirely freed and replaced with a 2M contiguous mapping.
intel-iommu errors out with something like:
ERROR: DMA PTE for vPFN 0x0 already set (to 5c2b8003 not 849c00083)
In this case 5c2b8003 is the pointer to the previous leaf page that was
neither freed nor cleared and 849c00083 is the superpage entry that
we're trying to replace it with.
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/intel-iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -913,7 +913,7 @@ static void dma_pte_free_level(struct dm
/* If range covers entire pagetable, free it */
if (!(start_pfn > level_pfn ||
- last_pfn < level_pfn + level_size(level))) {
+ last_pfn < level_pfn + level_size(level) - 1)) {
dma_clear_pte(pte);
domain_flush_cache(domain, pte, sizeof(*pte));
free_pgtable_page(level_pte);
Patches currently in stable-queue which might be from alex.williamson@xxxxxxxxxx are
queue-3.4/intel-iommu-fix-off-by-one-in-pagetable-freeing.patch
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