CVE-2024-44942: f2fs: fix to do sanity check on F2FS_INLINE_DATA flag in inode during GC
First published: Mon Aug 26 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on F2FS_INLINE_DATA flag in inode during GC syzbot reports a f2fs bug as below: ------------[ cut here ]------------ kernel BUG at fs/f2fs/inline.c:258! CPU: 1 PID: 34 Comm: kworker/u8:2 Not tainted 6.9.0-rc6-syzkaller-00012-g9e4bc4bcae01 #0 RIP: 0010:f2fs_write_inline_data+0x781/0x790 fs/f2fs/inline.c:258 Call Trace: f2fs_write_single_data_page+0xb65/0x1d60 fs/f2fs/data.c:2834 f2fs_write_cache_pages fs/f2fs/data.c:3133 [inline] __f2fs_write_data_pages fs/f2fs/data.c:3288 [inline] f2fs_write_data_pages+0x1efe/0x3a90 fs/f2fs/data.c:3315 do_writepages+0x35b/0x870 mm/page-writeback.c:2612 __writeback_single_inode+0x165/0x10b0 fs/fs-writeback.c:1650 writeback_sb_inodes+0x905/0x1260 fs/fs-writeback.c:1941 wb_writeback+0x457/0xce0 fs/fs-writeback.c:2117 wb_do_writeback fs/fs-writeback.c:2264 [inline] wb_workfn+0x410/0x1090 fs/fs-writeback.c:2304 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa12/0x17c0 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f2/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The root cause is: inline_data inode can be fuzzed, so that there may be valid blkaddr in its direct node, once f2fs triggers background GC to migrate the block, it will hit f2fs_bug_on() during dirty page writeback. Let's add sanity check on F2FS_INLINE_DATA flag in inode during GC, so that, it can forbid migrating inline_data inode's data block for fixing.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <6.6.47 | |
| Linux Linux kernel | >=6.7<6.10.6 | |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.115-1<=6.1.112-1 | 6.11.9-1 6.11.10-1 |
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Reference Links
- https://git.kernel.org/stable/c/26c07775fb5dc74351d1c3a2bc3cdf609b03e49f
- https://git.kernel.org/stable/c/ae00e6536a2dd54b64b39e9a39548870cf835745
- https://git.kernel.org/stable/c/fc01008c92f40015aeeced94750855a7111b6929
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44942
- https://nvd.nist.gov/vuln/detail/CVE-2024-44942
- https://launchpad.net/bugs/cve/CVE-2024-44942
- https://security-tracker.debian.org/tracker/CVE-2024-44942
- https://ubuntu.com/security/CVE-2024-44942
- https://git.kernel.org/linus/fc01008c92f40015aeeced94750855a7111b6929
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