Description
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Disallow dirty tracking if incoherent page walk Dirty page tracking relies on the IOMMU atomically updating the dirty bit in the paging-structure entry. For this operation to succeed, the paging- structure memory must be coherent between the IOMMU and the CPU. In another word, if the iommu page walk is incoherent, dirty page tracking doesn't work. The Intel VT-d specification, Section 3.10 "Snoop Behavior" states: "Remapping hardware encountering the need to atomically update A/EA/D bits in a paging-structure entry that is not snooped will result in a non- recoverable fault." To prevent an IOMMU from being incorrectly configured for dirty page tracking when it is operating in an incoherent mode, mark SSADS as supported only when both ecap_slads and ecap_smpwc are supported.
Product status
f35f22cc760eb2c7034bf53251399685d611e03f (git) before ebe16d245a00626bb87163862a1b07daf5475a3e
f35f22cc760eb2c7034bf53251399685d611e03f (git) before 8d096ce0e87bdc361f0b25d7943543bc53aa0b9e
f35f22cc760eb2c7034bf53251399685d611e03f (git) before 57f55048e564dedd8a4546d018e29d6bbfff0a7e
6.7
Any version before 6.7
6.12.53 (semver)
6.17.3 (semver)
6.18-rc1 (original_commit_for_fix)
References
git.kernel.org/...c/ebe16d245a00626bb87163862a1b07daf5475a3e
git.kernel.org/...c/8d096ce0e87bdc361f0b25d7943543bc53aa0b9e
git.kernel.org/...c/57f55048e564dedd8a4546d018e29d6bbfff0a7e
