- Vulnerability/
- CVE-2024-56586
CVE-2024-56586: f2fs: fix f2fs_bug_on when uninstalling filesystem call f2fs_evict_inode.
First published: Fri Dec 27 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Kernel-devel | ||
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/9669b28f81e0ec6305af7773846fbe2cef1e7d61
- https://git.kernel.org/stable/c/9e28513fd2858911dcf47b84160a8824587536b6
- https://git.kernel.org/stable/c/a365de2fbfbe1e6740bfb75ab5c3245cf7bbe4d7
- https://git.kernel.org/stable/c/ac8aaf78bd039fa1be0acaa8e84a56499f79d721
- https://git.kernel.org/stable/c/d5c367ef8287fb4d235c46a2f8c8d68715f3a0ca
- https://git.kernel.org/stable/c/dff561e4060d28edc9a2960d4a87f3c945a96aa3
- https://git.kernel.org/stable/c/ef517d2d21c3d8e2ad35b2bb728bd1c90a31e617
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56586
- https://nvd.nist.gov/vuln/detail/CVE-2024-56586
- https://launchpad.net/bugs/cve/CVE-2024-56586
- https://security-tracker.debian.org/tracker/CVE-2024-56586
- https://ubuntu.com/security/CVE-2024-56586
- https://git.kernel.org/linus/d5c367ef8287fb4d235c46a2f8c8d68715f3a0ca
Frequently Asked Questions
What is the severity of CVE-2024-56586?
CVE-2024-56586 is classified as a medium severity vulnerability in the Linux kernel.
Which versions of the Linux kernel are affected by CVE-2024-56586?
CVE-2024-56586 affects various versions of the Linux kernel including 5.10.223-1 and earlier, up to 5.10.234-1, and 6.1 series versions prior to 6.1.129-1.
How do I fix CVE-2024-56586?
To fix CVE-2024-56586, upgrade to patched versions of the Linux kernel such as 5.10.234-1, 6.1.129-1, or newer.
What exploit scenarios are associated with CVE-2024-56586?
CVE-2024-56586 could potentially be exploited by creating large files during checkpoint disable until space runs out.
Is there any workaround for CVE-2024-56586 until I can patch?
Currently, it is recommended to avoid creating large files during checkpoint disable as a temporary measure against CVE-2024-56586.
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