| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-56586: f2fs: fix f2fs_bug_on when uninstalling filesystem call f2fs_evict_inode. |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2024-56586 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.287 with commit ac8aaf78bd039fa1be0acaa8e84a56499f79d721 |
| Fixed in 5.10.231 with commit dff561e4060d28edc9a2960d4a87f3c945a96aa3 |
| Fixed in 5.15.174 with commit a365de2fbfbe1e6740bfb75ab5c3245cf7bbe4d7 |
| Fixed in 6.1.120 with commit ef517d2d21c3d8e2ad35b2bb728bd1c90a31e617 |
| Fixed in 6.6.66 with commit 9669b28f81e0ec6305af7773846fbe2cef1e7d61 |
| Fixed in 6.12.5 with commit 9e28513fd2858911dcf47b84160a8824587536b6 |
| Fixed in 6.13 with commit d5c367ef8287fb4d235c46a2f8c8d68715f3a0ca |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-56586 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| fs/f2fs/inode.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| 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 |
