Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: fuse: fix invalidate lock leak on open O_TRUNC DAX failure fuse_open() takes filemap_invalidate_lock() for a DAX truncate (dax_truncate = true) and releases it before the out_inode_unlock label. But when fuse_dax_break_layouts() fails, the goto out_inode_unlock skips the unlock and leaks the rwsem, so any later fault or truncate on the file stalls on the stale lock. fuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal interrupts the wait for busy DAX pages to drain: open("file", O_RDWR | O_TRUNC) └─ fuse_open() ├─ filemap_invalidate_lock() # dax_truncate └─ fuse_dax_break_layouts() └─ dax_break_layout() └─ wait_page_idle() # TASK_INTERRUPTIBLE └─ fuse_wait_dax_page() # unlock, schedule, re-lock └─ signal → -ERESTARTSYS goto out_inode_unlock # <- lock leaked Fix this by moving filemap_invalidate_unlock() below the label so that all error paths release the lock, and rename the label to out_unlock as it now covers more than just the inode lock.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d58366aab86854217b81679d1a9dcd54a2edfc2a before 1b04d80a27d317064cce2307472f5bef9975bc50; affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b before a61524da59a2f5ac9c8de23ff98b30da769ab144; affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b before dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010; affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b before 7288c279ddbd654a06c82118c1a3f5570c1807f0; affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b before 776e85fda752f9a15e0f82dec42ecacd12a9bd94; affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b before 1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da; affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b before e981474d7bf1457da12404e169ea147d2c8ecea7; affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b before a927f1867e61b78f39f9da0bbba3c98c2ca151fe; affected 81775ab858b4236c52c5da7e25cec6e49dd91b46; affected b57e150ac2eac791d5d187923b73dc2dafaf67fa; affected 1fdbbe246daf348adaa0739463384b16ceba1fc0; affected 5.15.109 before 5.15.220; affected 5.10.179 before 5.11; affected 5.18.18 before 5.19; affected 5.19.2 before 5.20 |
| Linux / Linux | affected 6.0; unaffected 0 before 6.0; unaffected 5.15.220 through 5.15.*; unaffected 6.1.187 through 6.1.*; unaffected 6.6.156 through 6.6.*; unaffected 6.12.108 through 6.12.*; unaffected 6.18.49 through 6.18.*; unaffected 7.1.13 through 7.1.*; unaffected 7.2.3 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/1b04d80a27d317064cce2307472f5bef9975bc50
- https://git.kernel.org/stable/c/a61524da59a2f5ac9c8de23ff98b30da769ab144
- https://git.kernel.org/stable/c/dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010
- https://git.kernel.org/stable/c/7288c279ddbd654a06c82118c1a3f5570c1807f0
- https://git.kernel.org/stable/c/776e85fda752f9a15e0f82dec42ecacd12a9bd94
- https://git.kernel.org/stable/c/1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da
- https://git.kernel.org/stable/c/e981474d7bf1457da12404e169ea147d2c8ecea7
- https://git.kernel.org/stable/c/a927f1867e61b78f39f9da0bbba3c98c2ca151fe