Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: hold event_mutex while checkpointing CRIU events kfd_criu_checkpoint_events() counts the entries in p->event_idr via kfd_get_num_events(), allocates an array sized to that count, and then walks the same IDR to fill it. Neither the count nor the walk holds p->event_mutex. The CRIU checkpoint caller holds only p->mutex. Event create and destroy (kfd_event_create()/kfd_event_destroy()) take p->event_mutex and do not take p->mutex, so a second thread in the same process can insert or remove events between the count and the walk. If an event is inserted, the walk iterates more entries than were counted and writes past the end of the ev_privs allocation; if an event is removed, the walk dereferences an entry that is being freed. Hold p->event_mutex across the count and the walk so both observe a consistent view of p->event_idr. The lock is released before copy_to_user(), which only touches the local buffer. The caller already holds p->mutex and the create/destroy paths never take p->mutex, so the p->mutex -> p->event_mutex order is not inverted and no deadlock is introduced. (cherry picked from commit ff57e223ab105795b05d3ef3f3c35a5a441bcbaa)
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 40e8a766a761f7fdc8530347527b344fddf6f1a8 before 8f7196f25b14f4290738639a50459b56a5ff2784; affected 40e8a766a761f7fdc8530347527b344fddf6f1a8 before 2040b7e39027cb83bb8c7b84a4c95c2f6053c32f; affected 40e8a766a761f7fdc8530347527b344fddf6f1a8 before 9a7f765985f64fd4a7a58f7bc9cd80a1f4230628; affected 40e8a766a761f7fdc8530347527b344fddf6f1a8 before 6a52f48157fa7fb81e0c146937fd6c8b0c1cfdbd; affected 40e8a766a761f7fdc8530347527b344fddf6f1a8 before bed80be08c0bee47fa242a4256ac873477c815f8; affected 40e8a766a761f7fdc8530347527b344fddf6f1a8 before ff8bc5a68a9a70bdc38d61a72c7a49c56063f9d2 |
| Linux / Linux | affected 5.18; unaffected 0 before 5.18; unaffected 6.1.183 through 6.1.*; unaffected 6.6.151 through 6.6.*; unaffected 6.12.103 through 6.12.*; unaffected 6.18.44 through 6.18.*; unaffected 7.1.8 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/8f7196f25b14f4290738639a50459b56a5ff2784
- https://git.kernel.org/stable/c/2040b7e39027cb83bb8c7b84a4c95c2f6053c32f
- https://git.kernel.org/stable/c/9a7f765985f64fd4a7a58f7bc9cd80a1f4230628
- https://git.kernel.org/stable/c/6a52f48157fa7fb81e0c146937fd6c8b0c1cfdbd
- https://git.kernel.org/stable/c/bed80be08c0bee47fa242a4256ac873477c815f8
- https://git.kernel.org/stable/c/ff8bc5a68a9a70bdc38d61a72c7a49c56063f9d2
ADP enrichment
No English description supplied.
No references supplied.