Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: Handle preemption in BTT lane acquisition BTT lanes serialize access to per-lane metadata and workspace state during BTT I/O. The btt-check unit test reports data mismatches during BTT writes due to a race in lane acquisition that can lead to silent data corruption. The existing lane model uses a spinlock together with a per-CPU recursion count. That recursion model stopped being valid after BTT lanes became preemptible: another task can run on the same CPU, observe a non-zero recursion count, bypass locking, and use the same lane concurrently. BTT lanes are also held across arena_write_bytes() calls. That path reaches nsio_rw_bytes(), which flushes writes with nvdimm_flush(). Some provider flush callbacks can sleep, making a spinlock the wrong primitive for the lane lifetime. Replace the spinlock-based recursion model with a dynamically allocated per-lane mutex array and take the lane lock unconditionally. Add might_sleep() to catch any future atomic-context caller. Found with the ndctl unit test btt-check.sh.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f23859748e3d530217b197e146a9ac84faf0a282 before fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735; affected 6f50b414f1a0d790f11a6438a3ad6d0577eb2c18 before 73e35c1bdfa160b41fdbe204e02325f0687de506; affected 36c75ce3bd299878fd9b238e9803d3817ddafbf3 before 417918783bcfe0be135019df16a267b3af442efd; affected 36c75ce3bd299878fd9b238e9803d3817ddafbf3 before 5c53406098b599c420b031e6ec5ba8a2f3794c50; affected 36c75ce3bd299878fd9b238e9803d3817ddafbf3 before 4eafa810b042d985ec6bbf5b514414e73cee6f6f; affected 36c75ce3bd299878fd9b238e9803d3817ddafbf3 before 8d4b989d9c9afe5f185aa5853b666fc4617afe9e; affected 2577fece583c7c05cda7ad50dde7638c962665e1; affected 40ba3fa21250e361bdd8f00800b3e2cb6160de95; affected b0e7a935739f33ed2bd6868b89f97dd4c2683c26; affected 66eb7b7f23dd9aec5356e7054dd3596ae7648ff5; affected b27751fb1f271bbb78d5993c0b10011628e40e18; affected 6.1.63 before 6.1.178; affected 6.6.2 before 6.6.145; affected 4.19.299 before 4.20; affected 5.4.261 before 5.5; affected 5.10.201 before 5.11; affected 5.15.139 before 5.16; affected 6.5.12 before 6.6 |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735
- https://git.kernel.org/stable/c/73e35c1bdfa160b41fdbe204e02325f0687de506
- https://git.kernel.org/stable/c/417918783bcfe0be135019df16a267b3af442efd
- https://git.kernel.org/stable/c/5c53406098b599c420b031e6ec5ba8a2f3794c50
- https://git.kernel.org/stable/c/4eafa810b042d985ec6bbf5b514414e73cee6f6f
- https://git.kernel.org/stable/c/8d4b989d9c9afe5f185aa5853b666fc4617afe9e
ADP enrichment
No English description supplied.
No references supplied.