Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix f2fs_bug_on when uninstalling filesystem call f2fs_evict_inode. creating a large files during checkpoint disable until it runs out of space and then delete it, then remount to enable checkpoint again, and then unmount the filesystem triggers the f2fs_bug_on as below: ------------[ cut here ]------------ kernel BUG at fs/f2fs/inode.c:896! CPU: 2 UID: 0 PID: 1286 Comm: umount Not tainted 6.11.0-rc7-dirty #360 Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI RIP: 0010:f2fs_evict_inode+0x58c/0x610 Call Trace: __die_body+0x15/0x60 die+0x33/0x50 do_trap+0x10a/0x120 f2fs_evict_inode+0x58c/0x610 do_error_trap+0x60/0x80 f2fs_evict_inode+0x58c/0x610 exc_invalid_op+0x53/0x60 f2fs_evict_inode+0x58c/0x610 asm_exc_invalid_op+0x16/0x20 f2fs_evict_inode+0x58c/0x610 evict+0x101/0x260 dispose_list+0x30/0x50 evict_inodes+0x140/0x190 generic_shutdown_super+0x2f/0x150 kill_block_super+0x11/0x40 kill_f2fs_super+0x7d/0x140 deactivate_locked_super+0x2a/0x70 cleanup_mnt+0xb3/0x140 task_work_run+0x61/0x90 The root cause is: creating large files during disable checkpoint period results in not enough free segments, so when writing back root inode will failed in f2fs_enable_checkpoint. When umount the file system after enabling checkpoint, the root inode is dirty in f2fs_evict_inode function, which triggers BUG_ON. The steps to reproduce are as follows: dd if=/dev/zero of=f2fs.img bs=1M count=55 mount f2fs.img f2fs_dir -o checkpoint=disable:10% dd if=/dev/zero of=big bs=1M count=50 sync rm big mount -o remount,checkpoint=enable f2fs_dir umount f2fs_dir Let's redirty inode when there is not free segments during checkpoint is disable.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to < ac8aaf78bd039fa1be0acaa8e84a56499f79d721affected98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to < dff561e4060d28edc9a2960d4a87f3c945a96aa3affected98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to < a365de2fbfbe1e6740bfb75ab5c3245cf7bbe4d7affected98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to < ef517d2d21c3d8e2ad35b2bb728bd1c90a31e617affected98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to < 9669b28f81e0ec6305af7773846fbe2cef1e7d61affected98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to < 9e28513fd2858911dcf47b84160a8824587536b6affected98e4da8ca301e062d79ae168c67e56f3c3de3ce4 to < d5c367ef8287fb4d235c46a2f8c8d68715f3a0caaffected
Linux Linux
Default version status: affected
3.8affected0 to < 3.8unaffected5.4.287 to ≤ 5.4.*unaffected5.10.231 to ≤ 5.10.*unaffected5.15.174 to ≤ 5.15.*unaffected6.1.120 to ≤ 6.1.*unaffected6.6.66 to ≤ 6.6.*unaffected6.12.5 to ≤ 6.12.*unaffected6.13 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ac8aaf78bd039fa1be0acaa8e84a56499f79d721 ↗
- https://git.kernel.org/stable/c/dff561e4060d28edc9a2960d4a87f3c945a96aa3 ↗
- https://git.kernel.org/stable/c/a365de2fbfbe1e6740bfb75ab5c3245cf7bbe4d7 ↗
- https://git.kernel.org/stable/c/ef517d2d21c3d8e2ad35b2bb728bd1c90a31e617 ↗
- https://git.kernel.org/stable/c/9669b28f81e0ec6305af7773846fbe2cef1e7d61 ↗
- https://git.kernel.org/stable/c/9e28513fd2858911dcf47b84160a8824587536b6 ↗
- https://git.kernel.org/stable/c/d5c367ef8287fb4d235c46a2f8c8d68715f3a0ca ↗
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html ↗
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html ↗