Linux Kernel nilfs2 sysfs race condition fix: Protect superblock buffer access with mutex

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Title: nilfs2: protect references to superblock parameters exposed in sysfs - Description: The nilfs2 superblock buffer can not only be overwritten at runtime but also periodically replaced or discarded, even being discarded when downgraded to single-side. This may cause issues when accessing these buffers via sysfs, as they require mutex protection. 2. Fix Measures: - Code Changes: Fixed the sysfs attribute read methods that previously accessed the superblock buffer without mutex protection, potentially leading to pointer and memory access issues. The fix ensures mutex protection is used when accessing the superblock buffer. 3. Patch Links: - Upstream commit: 683408258917541bdb294cd717c210a04381931e - Patch Link: https://lkml.kernel.org/r/20240811100320.9913-1-konishi.ryusuke@gmail.com 4. Patch Content: - File: fs/nfs2/sysfs.c - Changes: Fixed the sysfs attribute read methods to ensure mutex protection is used when accessing the superblock buffer. 5. Patch Application: - Application: Applied via git to the kernel source code. 6. Patch Author: - Author: Ryusuke Konishi 7. Patch Submission Time: - Time: 2024-08-11 19:03:20 +0900 8. Patch Status: - Status: Fixed This information provides a comprehensive understanding of the vulnerability’s background, mitigation measures, and detailed patch content, which is crucial for analyzing the nature of the vulnerability and its remediation process.

Goal Reached Thanks to every supporter — we hit 100%!

Linux Kernel nilfs2 sysfs race condition fix: Protect superblock buffer access with mutex