| 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-2024-42297: f2fs: fix to don't dirty inode for readonly filesystem |
| |
| 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(). |
| |
| The Linux kernel CVE team has assigned CVE-2024-42297 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.19.320 with commit 2d2916516577f2239b3377d9e8d12da5e6ccdfcf |
| Fixed in 5.4.282 with commit 54162974aea37a8cae00742470a78c7f6bd6f915 |
| Fixed in 5.10.224 with commit 54bc4e88447e385c4d4ffa85d93e0dce628fcfa6 |
| Fixed in 5.15.165 with commit ec56571b4b146a1cfbedab49d5fcaf19fe8bf4f1 |
| Fixed in 6.1.103 with commit 9ce8135accf103f7333af472709125878704fdd4 |
| Fixed in 6.6.44 with commit e62ff092a42f4a1bae3b310cf46673b4f3aac3b5 |
| Fixed in 6.10.3 with commit 2434344559f6743efb3ac15d11af9a0db9543bd3 |
| Fixed in 6.11 with commit 192b8fb8d1c8ca3c87366ebbef599fa80bb626b8 |
| |
| 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-2024-42297 |
| 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/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 |
