| Assigner | Linux |
| Reserved | 2024-02-19 |
| Published | 2024-05-01 |
| Updated | 2024-06-04 |
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.
Product status
eafc474e2029 before c7077f43f30d
eafc474e2029 before 617d55b90e73
eafc474e2029 before f82f184874d2
eafc474e2029 before 0a69b6b3a026
6.6
Any version before 6.6
6.6.24
6.7.12
6.8.3
6.9
References
https://git.kernel.org/stable/c/c7077f43f30d817d10a9f8245e51576ac114b2f0
https://git.kernel.org/stable/c/617d55b90e73c7b4aa2733ca6cc3f9b72d1124bb
https://git.kernel.org/stable/c/f82f184874d2761ebaa60dccf577921a0dbb3810
https://git.kernel.org/stable/c/0a69b6b3a026543bc215ccc866d0aea5579e6ce2
