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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2020-08-22 17:02:09 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2020-09-04 12:14:28 +0200 |
| commit | 29aaebbca4abc4cceb38738483051abefafb6950 (patch) | |
| tree | cac0bb145e32c1f2e5079ba7817f5151e46767ed /MAINTAINERS | |
| parent | 2822e582501b65707089b097e773e6fd70774841 (diff) | |
| download | linux-29aaebbca4abc4cceb38738483051abefafb6950.tar.bz2 | |
iommu/vt-d: Handle 36bit addressing for x86-32
Beware that the address size for x86-32 may exceed unsigned long.
[ 0.368971] UBSAN: shift-out-of-bounds in drivers/iommu/intel/iommu.c:128:14
[ 0.369055] shift exponent 36 is too large for 32-bit type 'long unsigned int'
If we don't handle the wide addresses, the pages are mismapped and the
device read/writes go astray, detected as DMAR faults and leading to
device failure. The behaviour changed (from working to broken) in commit
fa954e683178 ("iommu/vt-d: Delegate the dma domain to upper layer"), but
the error looks older.
Fixes: fa954e683178 ("iommu/vt-d: Delegate the dma domain to upper layer")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Cc: James Sewart <jamessewart@arista.com>
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: <stable@vger.kernel.org> # v5.3+
Link: https://lore.kernel.org/r/20200822160209.28512-1-chris@chris-wilson.co.uk
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'MAINTAINERS')
0 files changed, 0 insertions, 0 deletions