| 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-2021-47498: dm rq: don't queue request to blk-mq during DM suspend |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| dm rq: don't queue request to blk-mq during DM suspend |
| |
| DM uses blk-mq's quiesce/unquiesce to stop/start device mapper queue. |
| |
| But blk-mq's unquiesce may come from outside events, such as elevator |
| switch, updating nr_requests or others, and request may come during |
| suspend, so simply ask for blk-mq to requeue it. |
| |
| Fixes one kernel panic issue when running updating nr_requests and |
| dm-mpath suspend/resume stress test. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47498 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.14.14 with commit 8ca9745efe3528feb06ca4e117188038eea2d351 |
| Fixed in 5.15 with commit b4459b11e84092658fa195a2587aff3b9637f0e7 |
| |
| 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-2021-47498 |
| 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: |
| drivers/md/dm-rq.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/8ca9745efe3528feb06ca4e117188038eea2d351 |
| https://git.kernel.org/stable/c/b4459b11e84092658fa195a2587aff3b9637f0e7 |
