| 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-2022-49634: sysctl: Fix data-races in proc_dou8vec_minmax(). |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| sysctl: Fix data-races in proc_dou8vec_minmax(). |
| |
| A sysctl variable is accessed concurrently, and there is always a chance |
| of data-race. So, all readers and writers need some basic protection to |
| avoid load/store-tearing. |
| |
| This patch changes proc_dou8vec_minmax() to use READ_ONCE() and |
| WRITE_ONCE() internally to fix data-races on the sysctl side. For now, |
| proc_dou8vec_minmax() itself is tolerant to a data-race, but we still |
| need to add annotations on the other subsystem's side. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49634 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.13 with commit cb9444130662c6c13022579c861098f212db2562 and fixed in 5.15.56 with commit e58b02e445463065b4078bf621561da75197853f |
| Issue introduced in 5.13 with commit cb9444130662c6c13022579c861098f212db2562 and fixed in 5.18.13 with commit 5f776daef0b5354615ec4b4234cd9539ca05f273 |
| Issue introduced in 5.13 with commit cb9444130662c6c13022579c861098f212db2562 and fixed in 5.19 with commit 7dee5d7747a69aa2be41f04c6a7ecfe3ac8cdf18 |
| |
| 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-2022-49634 |
| 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: |
| kernel/sysctl.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/f177b382c33900d0e5a9766493c11a1074076f78 |
| https://git.kernel.org/stable/c/e58b02e445463065b4078bf621561da75197853f |
| https://git.kernel.org/stable/c/5f776daef0b5354615ec4b4234cd9539ca05f273 |
| https://git.kernel.org/stable/c/7dee5d7747a69aa2be41f04c6a7ecfe3ac8cdf18 |
