Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 before 6d67b2a73b8e3a079c355bab3c1aef7d85a044b8; affected 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 before 5fcb6fce74ffa614d964667110cf1a516c48c6d9; affected 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 before a4aeaa06d45e90f9b279f0b09de84bd00006e733 |
| Linux / Linux | affected 5.4; unaffected 0 before 5.4; unaffected 5.10.78 through 5.10.*; unaffected 5.14.16 through 5.14.*; unaffected 5.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/6d67b2a73b8e3a079c355bab3c1aef7d85a044b8
- https://git.kernel.org/stable/c/5fcb6fce74ffa614d964667110cf1a516c48c6d9
- https://git.kernel.org/stable/c/a4aeaa06d45e90f9b279f0b09de84bd00006e733
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.