CVE-2024-42297

f2fs: fix to don't dirty inode for readonly filesystem

State: Published
Severity: 7.8 High
Published: Aug 17, 2024
Updated: Aug 5, 2026
Reserved: Jul 30, 2024

Description

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().

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 2d2916516577f2239b3377d9e8d12da5e6ccdfcfAffected 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 54162974aea37a8cae00742470a78c7f6bd6f915Affected 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 54bc4e88447e385c4d4ffa85d93e0dce628fcfa6Affected 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before ec56571b4b146a1cfbedab49d5fcaf19fe8bf4f1Affected 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 9ce8135accf103f7333af472709125878704fdd4Affected 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before e62ff092a42f4a1bae3b310cf46673b4f3aac3b5Affected 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 2434344559f6743efb3ac15d11af9a0db9543bd3Affected 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 192b8fb8d1c8ca3c87366ebbef599fa80bb626b8Affected
LinuxLinux	3.8Affected before 3.8Not affected 4.19.320 through 4.19.Not affected 5.4.282 through 5.4.Not affected 5.10.224 through 5.10.Not affected 5.15.165 through 5.15.Not affected 6.1.103 through 6.1.Not affected 6.6.44 through 6.6.Not affected 6.10.3 through 6.10.*Not affected 6.11 and laterNot affected

Product

Versions

LinuxLinux

98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 2d2916516577f2239b3377d9e8d12da5e6ccdfcfAffected
98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 54162974aea37a8cae00742470a78c7f6bd6f915Affected
98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 54bc4e88447e385c4d4ffa85d93e0dce628fcfa6Affected
98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before ec56571b4b146a1cfbedab49d5fcaf19fe8bf4f1Affected
98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 9ce8135accf103f7333af472709125878704fdd4Affected
98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before e62ff092a42f4a1bae3b310cf46673b4f3aac3b5Affected
98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 2434344559f6743efb3ac15d11af9a0db9543bd3Affected
98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to before 192b8fb8d1c8ca3c87366ebbef599fa80bb626b8Affected

LinuxLinux

3.8Affected
before 3.8Not affected
4.19.320 through 4.19.*Not affected
5.4.282 through 5.4.*Not affected
5.10.224 through 5.10.*Not affected
5.15.165 through 5.15.*Not affected
6.1.103 through 6.1.*Not affected
6.6.44 through 6.6.*Not affected
6.10.3 through 6.10.*Not affected
6.11 and laterNot affected

References

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