| 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-2023-52932: mm/swapfile: add cond_resched() in get_swap_pages() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm/swapfile: add cond_resched() in get_swap_pages() |
| |
| The softlockup still occurs in get_swap_pages() under memory pressure. 64 |
| CPU cores, 64GB memory, and 28 zram devices, the disksize of each zram |
| device is 50MB with same priority as si. Use the stress-ng tool to |
| increase memory pressure, causing the system to oom frequently. |
| |
| The plist_for_each_entry_safe() loops in get_swap_pages() could reach tens |
| of thousands of times to find available space (extreme case: |
| cond_resched() is not called in scan_swap_map_slots()). Let's add |
| cond_resched() into get_swap_pages() when failed to find available space |
| to avoid softlockup. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52932 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.14.306 with commit 29f0349c5c76b627fe06b87d4b13fa03a6ce8e64 |
| Fixed in 4.19.273 with commit 387217b97e99699c34e6d95ce2b91b327fcd853e |
| Fixed in 5.4.232 with commit d49c85a1913385eed46dd16a25ad0928253767f0 |
| Fixed in 5.10.168 with commit 30187be29052bba9203b0ae2bdd815e0bc2faaab |
| Fixed in 5.15.93 with commit 5dbe1ebd56470d03b78fc31491a9e4d433106ef2 |
| Fixed in 6.1.11 with commit 49178d4d61e78aed8c837dfeea8a450700f196e2 |
| Fixed in 6.2 with commit 7717fc1a12f88701573f9ed897cc4f6699c661e3 |
| |
| 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-2023-52932 |
| 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/swapfile.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/29f0349c5c76b627fe06b87d4b13fa03a6ce8e64 |
| https://git.kernel.org/stable/c/387217b97e99699c34e6d95ce2b91b327fcd853e |
| https://git.kernel.org/stable/c/d49c85a1913385eed46dd16a25ad0928253767f0 |
| https://git.kernel.org/stable/c/30187be29052bba9203b0ae2bdd815e0bc2faaab |
| https://git.kernel.org/stable/c/5dbe1ebd56470d03b78fc31491a9e4d433106ef2 |
| https://git.kernel.org/stable/c/49178d4d61e78aed8c837dfeea8a450700f196e2 |
| https://git.kernel.org/stable/c/7717fc1a12f88701573f9ed897cc4f6699c661e3 |
