| 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-2023-52940: mm: multi-gen LRU: fix crash during cgroup migration |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm: multi-gen LRU: fix crash during cgroup migration |
| |
| lru_gen_migrate_mm() assumes lru_gen_add_mm() runs prior to itself. This |
| isn't true for the following scenario: |
| |
| CPU 1 CPU 2 |
| |
| clone() |
| cgroup_can_fork() |
| cgroup_procs_write() |
| cgroup_post_fork() |
| task_lock() |
| lru_gen_migrate_mm() |
| task_unlock() |
| task_lock() |
| lru_gen_add_mm() |
| task_unlock() |
| |
| And when the above happens, kernel crashes because of linked list |
| corruption (mm_struct->lru_gen.list). |
| |
| The Linux kernel CVE team has assigned CVE-2023-52940 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1 with commit bd74fdaea146029e4fa12c6de89adbe0779348a9 and fixed in 6.1.11 with commit 04448022311cebd30969d3aebdde765f1258b360 |
| Issue introduced in 6.1 with commit bd74fdaea146029e4fa12c6de89adbe0779348a9 and fixed in 6.2 with commit de08eaa6156405f2e9369f06ba5afae0e4ab3b62 |
| |
| 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-2023-52940 |
| 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: |
| mm/vmscan.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/04448022311cebd30969d3aebdde765f1258b360 |
| https://git.kernel.org/stable/c/de08eaa6156405f2e9369f06ba5afae0e4ab3b62 |
