CVE-2024-47669: nilfs2: fix state management in error path of log writing function
First published: Wed Oct 09 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix state management in error path of log writing function After commit a694291a6211 ("nilfs2: separate wait function from nilfs_segctor_write") was applied, the log writing function nilfs_segctor_do_construct() was able to issue I/O requests continuously even if user data blocks were split into multiple logs across segments, but two potential flaws were introduced in its error handling. First, if nilfs_segctor_begin_construction() fails while creating the second or subsequent logs, the log writing function returns without calling nilfs_segctor_abort_construction(), so the writeback flag set on pages/folios will remain uncleared. This causes page cache operations to hang waiting for the writeback flag. For example, truncate_inode_pages_final(), which is called via nilfs_evict_inode() when an inode is evicted from memory, will hang. Second, the NILFS_I_COLLECTED flag set on normal inodes remain uncleared. As a result, if the next log write involves checkpoint creation, that's fine, but if a partial log write is performed that does not, inodes with NILFS_I_COLLECTED set are erroneously removed from the "sc_dirty_files" list, and their data and b-tree blocks may not be written to the device, corrupting the block mapping. Fix these issues by uniformly calling nilfs_segctor_abort_construction() on failure of each step in the loop in nilfs_segctor_do_construct(), having it clean up logs and segment usages according to progress, and correcting the conditions for calling nilfs_redirty_inodes() to ensure that the NILFS_I_COLLECTED flag is cleared.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=2.6.33<4.19.322 | |
| Linux Linux kernel | >=4.20<5.4.284 | |
| Linux Linux kernel | >=5.5<5.10.226 | |
| Linux Linux kernel | >=5.11<5.15.167 | |
| Linux Linux kernel | >=5.16<6.1.110 | |
| Linux Linux kernel | >=6.2<6.6.51 | |
| Linux Linux kernel | >=6.7<6.10.10 | |
| Linux Linux kernel | =6.11-rc1 | |
| Linux Linux kernel | =6.11-rc2 | |
| Linux Linux kernel | =6.11-rc3 | |
| Linux Linux kernel | =6.11-rc4 | |
| Linux Linux kernel | =6.11-rc5 | |
| Linux Linux kernel | =6.11-rc6 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/stable/c/40a2757de2c376ef8a08d9ee9c81e77f3c750adf
- https://git.kernel.org/stable/c/036441e8438b29111fa75008f0ce305fb4e83c0a
- https://git.kernel.org/stable/c/efdde00d4a1ef10bb71e09ebc67823a3d3ad725b
- https://git.kernel.org/stable/c/3e349d7191f0688fc9808ef24fd4e4b4ef5ca876
- https://git.kernel.org/stable/c/30562eff4a6dd35c4b5be9699ef61ad9f5f20a06
- https://git.kernel.org/stable/c/0a1a961bde4351dc047ffdeb2f1311ca16a700cc
- https://git.kernel.org/stable/c/74866c16ea2183f52925fa5d76061a1fe7f7737b
- https://git.kernel.org/stable/c/6576dd6695f2afca3f4954029ac4a64f82ba60ab
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-47669
- https://nvd.nist.gov/vuln/detail/CVE-2024-47669
- https://launchpad.net/bugs/cve/CVE-2024-47669
- https://security-tracker.debian.org/tracker/CVE-2024-47669
- https://ubuntu.com/security/CVE-2024-47669
- https://git.kernel.org/linus/6576dd6695f2afca3f4954029ac4a64f82ba60ab
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