| 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-2021-46967: vhost-vdpa: fix vm_flags for virtqueue doorbell mapping |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| vhost-vdpa: fix vm_flags for virtqueue doorbell mapping |
| |
| The virtqueue doorbell is usually implemented via registeres but we |
| don't provide the necessary vma->flags like VM_PFNMAP. This may cause |
| several issues e.g when userspace tries to map the doorbell via vhost |
| IOTLB, kernel may panic due to the page is not backed by page |
| structure. This patch fixes this by setting the necessary |
| vm_flags. With this patch, try to map doorbell via IOTLB will fail |
| with bad address. |
| |
| The Linux kernel CVE team has assigned CVE-2021-46967 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.8 with commit ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 and fixed in 5.10.36 with commit 3b8b6399666a29daa30b0bb3f5c9e3fc81c5a6a6 |
| Issue introduced in 5.8 with commit ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 and fixed in 5.11.20 with commit 940230a5c31e2714722aee04c521a21f484b4df7 |
| Issue introduced in 5.8 with commit ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 and fixed in 5.12.3 with commit 93dbbf20e3ffad14f04227a0b7105f6e6f0387ce |
| Issue introduced in 5.8 with commit ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 and fixed in 5.13 with commit 3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44 |
| |
| 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-2021-46967 |
| 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/vhost/vdpa.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/3b8b6399666a29daa30b0bb3f5c9e3fc81c5a6a6 |
| https://git.kernel.org/stable/c/940230a5c31e2714722aee04c521a21f484b4df7 |
| https://git.kernel.org/stable/c/93dbbf20e3ffad14f04227a0b7105f6e6f0387ce |
| https://git.kernel.org/stable/c/3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44 |
