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PUBLISHED

CVE-2024-26685

nilfs2: fix potential bug in end_buffer_async_write

Reserved:2024-02-19
Published:2024-04-03
Updated:2024-04-03

Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential bug in end_buffer_async_write According to a syzbot report, end_buffer_async_write(), which handles the completion of block device writes, may detect abnormal condition of the buffer async_write flag and cause a BUG_ON failure when using nilfs2. Nilfs2 itself does not use end_buffer_async_write(). But, the async_write flag is now used as a marker by commit 7f42ec394156 ("nilfs2: fix issue with race condition of competition between segments for dirty blocks") as a means of resolving double list insertion of dirty blocks in nilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the resulting crash. This modification is safe as long as it is used for file data and b-tree node blocks where the page caches are independent. However, it was irrelevant and redundant to also introduce async_write for segment summary and super root blocks that share buffers with the backing device. This led to the possibility that the BUG_ON check in end_buffer_async_write would fail as described above, if independent writebacks of the backing device occurred in parallel. The use of async_write for segment summary buffers has already been removed in a previous change. Fix this issue by removing the manipulation of the async_write flag for the remaining super root block buffer.

Product status

Default status
unaffected

7f42ec394156 before c4a09fdac625
affected

7f42ec394156 before d31c8721e816
affected

7f42ec394156 before f3e4963566f5
affected

7f42ec394156 before 8fa90634ec3e
affected

7f42ec394156 before 6589f0f72f8e
affected

7f42ec394156 before 2c3bdba00283
affected

7f42ec394156 before 626daab3811b
affected

7f42ec394156 before 5bc09b397cbf
affected

Default status
affected

3.12
affected

Any version before 3.12
unaffected

4.19.307
unaffected

5.4.269
unaffected

5.10.210
unaffected

5.15.149
unaffected

6.1.79
unaffected

6.6.18
unaffected

6.7.6
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/c4a09fdac625e64abe478dcf88bfa20406616928

https://git.kernel.org/stable/c/d31c8721e816eff5ca6573cc487754f357c093cd

https://git.kernel.org/stable/c/f3e4963566f58726d3265a727116a42b591f6596

https://git.kernel.org/stable/c/8fa90634ec3e9cc50f42dd605eec60f2d146ced8

https://git.kernel.org/stable/c/6589f0f72f8edd1fa11adce4eedbd3615f2e78ab

https://git.kernel.org/stable/c/2c3bdba00283a6c7a5b19481a59a730f46063803

https://git.kernel.org/stable/c/626daab3811b772086aef1bf8eed3ffe6f523eff

https://git.kernel.org/stable/c/5bc09b397cbf1221f8a8aacb1152650c9195b02b

cve.org CVE-2024-26685

nvd.nist.gov CVE-2024-26685

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