CVE-2023-54140

Description

In the Linux kernel, the following vulnerability has been resolved:nilfs2: fix WARNING in mark_buffer_dirty due to discarded buffer reuseA syzbot stress test using a corrupted disk image reported thatmark_buffer_dirty() called from __nilfs_mark_inode_dirty() ornilfs_palloc_commit_alloc_entry() may output a kernel warning, and canpanic if the kernel is booted with panic_on_warn.This is because nilfs2 keeps buffer pointers in local structures for somemetadata and reuses them, but such buffers may be forcibly discarded bynilfs_clear_dirty_page() in some critical situations.This issue is reported to appear after commit 28a65b49eb53 (nilfs2: donot write dirty data after degenerating to read-only), but the issue haspotentially existed before.Fix this issue by checking the uptodate flag when attempting to reuse aninternally held buffer, and reloading the metadata instead of reusing thebuffer if the flag was lost.

Risk Information

Associated Vulnerability

Patch Details

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234