| 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-2021-46917: dmaengine: idxd: fix wq cleanup of WQCFG registers |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| dmaengine: idxd: fix wq cleanup of WQCFG registers |
| |
| A pre-release silicon erratum workaround where wq reset does not clear |
| WQCFG registers was leaked into upstream code. Use wq reset command |
| instead of blasting the MMIO region. This also address an issue where |
| we clobber registers in future devices. |
| |
| The Linux kernel CVE team has assigned CVE-2021-46917 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.8 with commit da32b28c95a79e399e18c03f8178f41aec9c66e4 and fixed in 5.10.32 with commit e5eb9757fe4c2392e069246ae78badc573af1833 |
| Issue introduced in 5.8 with commit da32b28c95a79e399e18c03f8178f41aec9c66e4 and fixed in 5.11.16 with commit f7dc8f5619165e1fa3383d0c2519f502d9e2a1a9 |
| Issue introduced in 5.8 with commit da32b28c95a79e399e18c03f8178f41aec9c66e4 and fixed in 5.12 with commit ea9aadc06a9f10ad20a90edc0a484f1147d88a7a |
| Issue introduced in 5.7.10 with commit 2a2df2bd10de44c3804661ed15157817c12d6291 |
| |
| 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-2021-46917 |
| 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/dma/idxd/device.c |
| drivers/dma/idxd/idxd.h |
| drivers/dma/idxd/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/e5eb9757fe4c2392e069246ae78badc573af1833 |
| https://git.kernel.org/stable/c/f7dc8f5619165e1fa3383d0c2519f502d9e2a1a9 |
| https://git.kernel.org/stable/c/ea9aadc06a9f10ad20a90edc0a484f1147d88a7a |
