| 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-2024-50230: nilfs2: fix kernel bug due to missing clearing of checked flag |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| nilfs2: fix kernel bug due to missing clearing of checked flag |
| |
| Syzbot reported that in directory operations after nilfs2 detects |
| filesystem corruption and degrades to read-only, |
| __block_write_begin_int(), which is called to prepare block writes, may |
| fail the BUG_ON check for accesses exceeding the folio/page size, |
| triggering a kernel bug. |
| |
| This was found to be because the "checked" flag of a page/folio was not |
| cleared when it was discarded by nilfs2's own routine, which causes the |
| sanity check of directory entries to be skipped when the directory |
| page/folio is reloaded. So, fix that. |
| |
| This was necessary when the use of nilfs2's own page discard routine was |
| applied to more than just metadata files. |
| |
| The Linux kernel CVE team has assigned CVE-2024-50230 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.10 with commit 8c26c4e2694a163d525976e804d81cd955bbb40c and fixed in 4.19.323 with commit 994b2fa13a6c9cf3feca93090a9c337d48e3d60d |
| Issue introduced in 3.10 with commit 8c26c4e2694a163d525976e804d81cd955bbb40c and fixed in 5.4.285 with commit 64afad73e4623308d8943645e5631f2c7a2d7971 |
| Issue introduced in 3.10 with commit 8c26c4e2694a163d525976e804d81cd955bbb40c and fixed in 5.10.229 with commit aa0cee46c5d3fd9a39575a4c8a4f65f25f095b89 |
| Issue introduced in 3.10 with commit 8c26c4e2694a163d525976e804d81cd955bbb40c and fixed in 5.15.171 with commit f05dbebb8ee34882505d53d83af7d18f28a49248 |
| Issue introduced in 3.10 with commit 8c26c4e2694a163d525976e804d81cd955bbb40c and fixed in 6.1.116 with commit cd0cdb51b15203fa27d4b714be83b7dfffa0b752 |
| Issue introduced in 3.10 with commit 8c26c4e2694a163d525976e804d81cd955bbb40c and fixed in 6.6.60 with commit f2f1fa446676c21edb777e6d2bc4fa8f956fab68 |
| Issue introduced in 3.10 with commit 8c26c4e2694a163d525976e804d81cd955bbb40c and fixed in 6.11.7 with commit 56c6171932a7fb267ac6cb4ff8759b93ee1d0e2e |
| Issue introduced in 3.10 with commit 8c26c4e2694a163d525976e804d81cd955bbb40c and fixed in 6.12 with commit 41e192ad2779cae0102879612dfe46726e4396aa |
| |
| 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-2024-50230 |
| 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/nilfs2/page.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/994b2fa13a6c9cf3feca93090a9c337d48e3d60d |
| https://git.kernel.org/stable/c/64afad73e4623308d8943645e5631f2c7a2d7971 |
| https://git.kernel.org/stable/c/aa0cee46c5d3fd9a39575a4c8a4f65f25f095b89 |
| https://git.kernel.org/stable/c/f05dbebb8ee34882505d53d83af7d18f28a49248 |
| https://git.kernel.org/stable/c/cd0cdb51b15203fa27d4b714be83b7dfffa0b752 |
| https://git.kernel.org/stable/c/f2f1fa446676c21edb777e6d2bc4fa8f956fab68 |
| https://git.kernel.org/stable/c/56c6171932a7fb267ac6cb4ff8759b93ee1d0e2e |
| https://git.kernel.org/stable/c/41e192ad2779cae0102879612dfe46726e4396aa |
