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Change History

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd: serialize sequence allocation under concurrent TLB invalidations

With concurrent TLB invalidations, completion wait randomly gets timed out
because cmd_sem_val was incremented outside the IOMMU spinlock, allowing
CMD_COMPL_WAIT commands to be queued out of sequence and breaking the
ordering assumption in wait_on_sem().
Move the cmd_sem_val increment under iommu->lock so completion sequence
allocation is serialized with command queuing.
And remove the unnecessary return.

https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4

https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242

https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d