| 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-2024-53220: f2fs: fix to account dirty data in __get_secs_required() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| f2fs: fix to account dirty data in __get_secs_required() |
| |
| It will trigger system panic w/ testcase in [1]: |
| |
| ------------[ cut here ]------------ |
| kernel BUG at fs/f2fs/segment.c:2752! |
| RIP: 0010:new_curseg+0xc81/0x2110 |
| Call Trace: |
| f2fs_allocate_data_block+0x1c91/0x4540 |
| do_write_page+0x163/0xdf0 |
| f2fs_outplace_write_data+0x1aa/0x340 |
| f2fs_do_write_data_page+0x797/0x2280 |
| f2fs_write_single_data_page+0x16cd/0x2190 |
| f2fs_write_cache_pages+0x994/0x1c80 |
| f2fs_write_data_pages+0x9cc/0xea0 |
| do_writepages+0x194/0x7a0 |
| filemap_fdatawrite_wbc+0x12b/0x1a0 |
| __filemap_fdatawrite_range+0xbb/0xf0 |
| file_write_and_wait_range+0xa1/0x110 |
| f2fs_do_sync_file+0x26f/0x1c50 |
| f2fs_sync_file+0x12b/0x1d0 |
| vfs_fsync_range+0xfa/0x230 |
| do_fsync+0x3d/0x80 |
| __x64_sys_fsync+0x37/0x50 |
| x64_sys_call+0x1e88/0x20d0 |
| do_syscall_64+0x4b/0x110 |
| entry_SYSCALL_64_after_hwframe+0x76/0x7e |
| |
| The root cause is if checkpoint_disabling and lfs_mode are both on, |
| it will trigger OPU for all overwritten data, it may cost more free |
| segment than expected, so f2fs must account those data correctly to |
| calculate cosumed free segments later, and return ENOSPC earlier to |
| avoid run out of free segment during block allocation. |
| |
| [1] https://lore.kernel.org/fstests/20241015025106.3203676-1-chao@kernel.org/ |
| |
| The Linux kernel CVE team has assigned CVE-2024-53220 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.20 with commit 4354994f097d068a894aa1a0860da54571df3582 and fixed in 6.1.120 with commit 6e58b2987960efcd917bc42da781cee256213618 |
| Issue introduced in 4.20 with commit 4354994f097d068a894aa1a0860da54571df3582 and fixed in 6.6.64 with commit f1b8bfe8d2f2fdf905d37c174d5bc1cd2b6910c5 |
| Issue introduced in 4.20 with commit 4354994f097d068a894aa1a0860da54571df3582 and fixed in 6.11.11 with commit 9313b85ddc120e2d2f0efaf86d0204d4c98d60b1 |
| Issue introduced in 4.20 with commit 4354994f097d068a894aa1a0860da54571df3582 and fixed in 6.12.2 with commit e812871c068cc0f91ff9f5cee87d00df1c44aae4 |
| Issue introduced in 4.20 with commit 4354994f097d068a894aa1a0860da54571df3582 and fixed in 6.13 with commit 1acd73edbbfef2c3c5b43cba4006a7797eca7050 |
| |
| 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-2024-53220 |
| 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/segment.h |
| |
| |
| 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/6e58b2987960efcd917bc42da781cee256213618 |
| https://git.kernel.org/stable/c/f1b8bfe8d2f2fdf905d37c174d5bc1cd2b6910c5 |
| https://git.kernel.org/stable/c/9313b85ddc120e2d2f0efaf86d0204d4c98d60b1 |
| https://git.kernel.org/stable/c/e812871c068cc0f91ff9f5cee87d00df1c44aae4 |
| https://git.kernel.org/stable/c/1acd73edbbfef2c3c5b43cba4006a7797eca7050 |
