Description
In the Linux kernel, the following vulnerability has been resolved: mm: khugepaged: skip huge page collapse for special files The read-only THP for filesystems will collapse THP for files opened readonly and mapped with VM_EXEC. The intended usecase is to avoid TLB misses for large text segments. But it doesn't restrict the file types so a THP could be collapsed for a non-regular file, for example, block device, if it is opened readonly and mapped with EXEC permission. This may cause bugs, like [1] and [2]. This is definitely not the intended usecase, so just collapse THP for regular files in order to close the attack surface. [shy828301@gmail.com: fix vm_file check [3]]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 to < 6d67b2a73b8e3a079c355bab3c1aef7d85a044b8affected99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 to < 5fcb6fce74ffa614d964667110cf1a516c48c6d9affected99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 to < a4aeaa06d45e90f9b279f0b09de84bd00006e733affected
Linux Linux
Default version status: affected
5.4affected0 to < 5.4unaffected5.10.78 to ≤ 5.10.*unaffected5.14.16 to ≤ 5.14.*unaffected5.15 to ≤ *unaffected