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19 lines
2.1 KiB
Markdown
19 lines
2.1 KiB
Markdown
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### [CVE-2024-44942](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44942)
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### Description
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In the Linux kernel, the following vulnerability has been resolved:f2fs: fix to do sanity check on F2FS_INLINE_DATA flag in inode during GCsyzbot 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 #0RIP: 0010:f2fs_write_inline_data+0x781/0x790 fs/f2fs/inline.c:258Call 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:244The root cause is: inline_data inode can be fuzzed, so that there maybe valid blkaddr in its direct node, once f2fs triggers background GCto migrate the block, it will hit f2fs_bug_on() during dirty pagewriteback.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 forfixing.
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### POC
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#### Reference
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No PoCs from references.
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#### Github
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- https://github.com/bygregonline/devsec-fastapi-report
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- https://github.com/robertsirc/sle-bci-demo
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