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Vulnerability CVE-2024-27058
Published: 2024-05-01
| 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. |
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
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