CVE-2024-42297: f2fs: fix to don't dirty inode for readonly filesystem
First published: Sat Aug 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to don't dirty inode for readonly filesystem syzbot reports f2fs bug as below: kernel BUG at fs/f2fs/inode.c:933! RIP: 0010:f2fs_evict_inode+0x1576/0x1590 fs/f2fs/inode.c:933 Call Trace: evict+0x2a4/0x620 fs/inode.c:664 dispose_list fs/inode.c:697 [inline] evict_inodes+0x5f8/0x690 fs/inode.c:747 generic_shutdown_super+0x9d/0x2c0 fs/super.c:675 kill_block_super+0x44/0x90 fs/super.c:1667 kill_f2fs_super+0x303/0x3b0 fs/f2fs/super.c:4894 deactivate_locked_super+0xc1/0x130 fs/super.c:484 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1256 task_work_run+0x24a/0x300 kernel/task_work.c:180 ptrace_notify+0x2cd/0x380 kernel/signal.c:2399 ptrace_report_syscall include/linux/ptrace.h:411 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:473 [inline] syscall_exit_work kernel/entry/common.c:251 [inline] syscall_exit_to_user_mode_prepare kernel/entry/common.c:278 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x15c/0x280 kernel/entry/common.c:296 do_syscall_64+0x50/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x63/0x6b The root cause is: - do_sys_open - f2fs_lookup - __f2fs_find_entry - f2fs_i_depth_write - f2fs_mark_inode_dirty_sync - f2fs_dirty_inode - set_inode_flag(inode, FI_DIRTY_INODE) - umount - kill_f2fs_super - kill_block_super - generic_shutdown_super - sync_filesystem : sb is readonly, skip sync_filesystem() - evict_inodes - iput - f2fs_evict_inode - f2fs_bug_on(sbi, is_inode_flag_set(inode, FI_DIRTY_INODE)) : trigger kernel panic When we try to repair i_current_depth in readonly filesystem, let's skip dirty inode to avoid panic in later f2fs_evict_inode().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <6.1.103 | |
| Linux Linux kernel | >=6.2<6.6.44 | |
| Linux Linux kernel | >=6.7<6.10.3 | |
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/2d2916516577f2239b3377d9e8d12da5e6ccdfcf
- https://git.kernel.org/stable/c/54162974aea37a8cae00742470a78c7f6bd6f915
- https://git.kernel.org/stable/c/54bc4e88447e385c4d4ffa85d93e0dce628fcfa6
- https://git.kernel.org/stable/c/ec56571b4b146a1cfbedab49d5fcaf19fe8bf4f1
- https://git.kernel.org/stable/c/9ce8135accf103f7333af472709125878704fdd4
- https://git.kernel.org/stable/c/e62ff092a42f4a1bae3b310cf46673b4f3aac3b5
- https://git.kernel.org/stable/c/2434344559f6743efb3ac15d11af9a0db9543bd3
- https://git.kernel.org/stable/c/192b8fb8d1c8ca3c87366ebbef599fa80bb626b8
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42297
- https://nvd.nist.gov/vuln/detail/CVE-2024-42297
- https://launchpad.net/bugs/cve/CVE-2024-42297
- https://security-tracker.debian.org/tracker/CVE-2024-42297
- https://ubuntu.com/security/CVE-2024-42297
- https://git.kernel.org/linus/192b8fb8d1c8ca3c87366ebbef599fa80bb626b8
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