Description
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: RCU-free the scheduler-containing nouveau_sched struct nouveau_sched embeds a struct drm_gpu_scheduler (base). nouveau_sched_destroy() calls nouveau_sched_fini() (which does drm_sched_fini(&sched->base)) and then frees the object with plain kfree(sched). drm_sched_fence_get_timeline_name() returns fence->sched->name, and the scheduler fence keeps a .release callback so it is not ops-detached on signalling. A finished fence exported to userspace via drm_syncobj / sync_file therefore keeps pointing at &sched->base after nouveau_sched_destroy(), and a later get_timeline_name() -- reachable unprivileged through SYNC_IOC_FILE_INFO -- dereferences freed memory (KASAN slab-use-after-free read). Per the dma-fence lifetime contract the exporter must keep the data backing a signalled fence alive for an RCU grace period. Free the scheduler-containing object with kfree_rcu() instead of kfree().
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
5f03a507b29e44a848f315c7240c19894dd8be4f to < 40edf5eefc3fd94592a91d6eb074d4fc6f606c75affected5f03a507b29e44a848f315c7240c19894dd8be4f to < 35151e9a8274174ccbb92e3b3ba7dc7a008dcadaaffected5f03a507b29e44a848f315c7240c19894dd8be4f to < cd6e11b6ebe04a0a1f1435df561acada9eadc563affected5f03a507b29e44a848f315c7240c19894dd8be4f to < f7eae6d8d768fabd6b59779ca7da79e02c74e113affected
Linux Linux
Default version status: affected
6.8affected0 to < 6.8unaffected6.12.112 to ≤ 6.12.*unaffected6.18.55 to ≤ 6.18.*unaffected7.2.9 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected