CVE-2021-47035

01/תיאור (מקור, אנגלית)

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Remove WO permissions on second-level paging entries When the first level page table is used for IOVA translation, it only supports Read-Only and Read-Write permissions. The Write-Only permission is not supported as the PRESENT bit (implying Read permission) should always set. When using second level, we still give separate permissions that allows WriteOnly which seems inconsistent and awkward. We want to have consistent behavior. After moving to 1st level, we don't want things to work sometimes, and break if we use 2nd level for the same mappings. Hence remove this configuration.

02/מוצרים מושפעים

linux: linux kernel

03/קישורים9

• git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0 Patch
• git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20 Patch
• git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2 Patch
• git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c Patch
• git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0 Patch
• git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20 Patch
• git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2 Patch
• git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3 Patch
• git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c Patch