Description
In the Linux kernel, the following vulnerability has been resolved: tmpfs: fix race on handling dquot rbtree A syzkaller reproducer found a race while attempting to remove dquot information from the rb tree. Fetching the rb_tree root node must also be protected by the dqopt->dqio_sem, otherwise, giving the right timing, shmem_release_dquot() will trigger a warning because it couldn't find a node in the tree, when the real reason was the root node changing before the search starts: Thread 1 Thread 2 - shmem_release_dquot() - shmem_{acquire,release}_dquot() - fetch ROOT - Fetch ROOT - acquire dqio_sem - wait dqio_sem - do something, triger a tree rebalance - release dqio_sem - acquire dqio_sem - start searching for the node, but from the wrong location, missing the node, and triggering a warning.
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
eafc474e202978ac735c551d5ee1eb8c02e2be54 to < c7077f43f30d817d10a9f8245e51576ac114b2f0affectedeafc474e202978ac735c551d5ee1eb8c02e2be54 to < 617d55b90e73c7b4aa2733ca6cc3f9b72d1124bbaffectedeafc474e202978ac735c551d5ee1eb8c02e2be54 to < f82f184874d2761ebaa60dccf577921a0dbb3810affectedeafc474e202978ac735c551d5ee1eb8c02e2be54 to < 0a69b6b3a026543bc215ccc866d0aea5579e6ce2affected
Linux Linux
Default version status: affected
6.6affected0 to < 6.6unaffected6.6.24 to ≤ 6.6.*unaffected6.7.12 to ≤ 6.7.*unaffected6.8.3 to ≤ 6.8.*unaffected6.9 to ≤ *unaffected