| 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-2022-48996: mm/damon/sysfs: fix wrong empty schemes assumption under online tuning in damon_sysfs_set_schemes() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm/damon/sysfs: fix wrong empty schemes assumption under online tuning in damon_sysfs_set_schemes() |
| |
| Commit da87878010e5 ("mm/damon/sysfs: support online inputs update") made |
| 'damon_sysfs_set_schemes()' to be called for running DAMON context, which |
| could have schemes. In the case, DAMON sysfs interface is supposed to |
| update, remove, or add schemes to reflect the sysfs files. However, the |
| code is assuming the DAMON context wouldn't have schemes at all, and |
| therefore creates and adds new schemes. As a result, the code doesn't |
| work as intended for online schemes tuning and could have more than |
| expected memory footprint. The schemes are all in the DAMON context, so |
| it doesn't leak the memory, though. |
| |
| Remove the wrong asssumption (the DAMON context wouldn't have schemes) in |
| 'damon_sysfs_set_schemes()' to fix the bug. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48996 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.19 with commit da87878010e59869d4d27b3c01ecc8ec06ff4a20 and fixed in 6.0.12 with commit f98d1f2a36ad7ab48fb4cf73ca14e7b19482fd4d |
| Issue introduced in 5.19 with commit da87878010e59869d4d27b3c01ecc8ec06ff4a20 and fixed in 6.1 with commit 95bc35f9bee5220dad4e8567654ab3288a181639 |
| |
| 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-2022-48996 |
| 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/damon/sysfs.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/f98d1f2a36ad7ab48fb4cf73ca14e7b19482fd4d |
| https://git.kernel.org/stable/c/95bc35f9bee5220dad4e8567654ab3288a181639 |
