| 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-2021-47351: ubifs: Fix races between xattr_{set|get} and listxattr operations |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ubifs: Fix races between xattr_{set|get} and listxattr operations |
| |
| UBIFS may occur some problems with concurrent xattr_{set|get} and |
| listxattr operations, such as assertion failure, memory corruption, |
| stale xattr value[1]. |
| |
| Fix it by importing a new rw-lock in @ubifs_inode to serilize write |
| operations on xattr, concurrent read operations are still effective, |
| just like ext4. |
| |
| [1] https://lore.kernel.org/linux-mtd/20200630130438.141649-1-houtao1@huawei.com |
| |
| The Linux kernel CVE team has assigned CVE-2021-47351 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.27 with commit 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and fixed in 5.4.133 with commit 7adc05b73d91a5e3d4ca7714fa53ad9b70c53d08 |
| Issue introduced in 2.6.27 with commit 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and fixed in 5.10.51 with commit 38dde03eb239605f428f3f1e4baa73d4933a4cc6 |
| Issue introduced in 2.6.27 with commit 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and fixed in 5.12.18 with commit 9558612cb829f2c022b788f55d6b8437d5234a82 |
| Issue introduced in 2.6.27 with commit 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and fixed in 5.13.3 with commit c0756f75c22149d20fcb7d8409827cee905eb386 |
| Issue introduced in 2.6.27 with commit 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and fixed in 5.14 with commit f4e3634a3b642225a530c292fdb1e8a4007507f5 |
| |
| 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-2021-47351 |
| 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/ubifs/super.c |
| fs/ubifs/ubifs.h |
| fs/ubifs/xattr.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/7adc05b73d91a5e3d4ca7714fa53ad9b70c53d08 |
| https://git.kernel.org/stable/c/38dde03eb239605f428f3f1e4baa73d4933a4cc6 |
| https://git.kernel.org/stable/c/9558612cb829f2c022b788f55d6b8437d5234a82 |
| https://git.kernel.org/stable/c/c0756f75c22149d20fcb7d8409827cee905eb386 |
| https://git.kernel.org/stable/c/f4e3634a3b642225a530c292fdb1e8a4007507f5 |
