Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: jbd2: bound shrinker scans by examined checkpoint buffers The jbd2 shrinker currently accounts only checkpoint buffers that it successfully releases against nr_to_scan. Busy buffers therefore do not consume the scan budget. If a checkpoint transaction contains mostly busy buffers, the shrinker can scan its entire checkpoint list while holding journal->j_list_lock. Large checkpoint lists can result in excessive lock hold times and leave other CPUs spinning on j_list_lock, causing soft lockups or RCU stalls. Pass nr_to_scan into journal_shrink_one_cp_list() and decrement it for every buffer examined, including busy buffers. Pass NULL from checkpoint cleanup paths so their existing full-list behavior is preserved. This restores the scan-budget semantics that existed before journal_shrink_one_cp_list() was changed to always scan a complete checkpoint list.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b98dba273a0e47dbfade89c9af73c5b012a4eabb before 6b5366ba63a58819396045ab146bd37ff9e503c6; affected b98dba273a0e47dbfade89c9af73c5b012a4eabb before edf5fcd0469b7467bd5b37a79502c8d9c3257dbb; affected b98dba273a0e47dbfade89c9af73c5b012a4eabb before 71c6b872c746465fa4b5def239cb296173ca8216; affected b98dba273a0e47dbfade89c9af73c5b012a4eabb before c2c0fb364685b8996c357d3b050394959b29d6e0; affected b98dba273a0e47dbfade89c9af73c5b012a4eabb before 15cb16496446b94e67f7abcb049b8e2c75cd3d02; affected 9c31bb2684f8035beca0275349d19d679b679ffb; affected 5fda50e262e65bd553ff777c4b280afd1495a18b; affected 557fda9ed70ebf8eda2620ba3d746215285a1303; affected 5.15.129 before 5.16; affected 6.1.50 before 6.2; affected 6.4.13 before 6.5 |
| Linux / Linux | affected 6.5; unaffected 0 before 6.5; unaffected 6.6.160 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/6b5366ba63a58819396045ab146bd37ff9e503c6
- https://git.kernel.org/stable/c/edf5fcd0469b7467bd5b37a79502c8d9c3257dbb
- https://git.kernel.org/stable/c/71c6b872c746465fa4b5def239cb296173ca8216
- https://git.kernel.org/stable/c/c2c0fb364685b8996c357d3b050394959b29d6e0
- https://git.kernel.org/stable/c/15cb16496446b94e67f7abcb049b8e2c75cd3d02