On Sat, Aug 22, 2020 at 05:02:09PM +0100, Chris Wilson wrote:
> 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 <[email protected]>
> Cc: James Sewart <[email protected]>
> Cc: Lu Baolu <[email protected]>
> Cc: Joerg Roedel <[email protected]>
> Cc: <[email protected]> # v5.3+
> ---
> drivers/iommu/intel/iommu.c | 14 +++++++-------
> 1 file changed, 7 insertions(+), 7 deletions(-)
Applied for v5.9, thanks.
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