| 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-2022-48849: drm/amdgpu: bypass tiling flag check in virtual display case (v2) |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amdgpu: bypass tiling flag check in virtual display case (v2) |
| |
| vkms leverages common amdgpu framebuffer creation, and |
| also as it does not support FB modifier, there is no need |
| to check tiling flags when initing framebuffer when virtual |
| display is enabled. |
| |
| This can fix below calltrace: |
| |
| amdgpu 0000:00:08.0: GFX9+ requires FB check based on format modifier |
| WARNING: CPU: 0 PID: 1023 at drivers/gpu/drm/amd/amdgpu/amdgpu_display.c:1150 amdgpu_display_framebuffer_init+0x8e7/0xb40 [amdgpu] |
| |
| v2: check adev->enable_virtual_display instead as vkms can be |
| enabled in bare metal as well. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48849 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.15.29 with commit fcd1d79aa943fff4fbaa0cce1d576995a7960699 |
| Fixed in 5.16.15 with commit cb29021be49858059138f75d6311a7c35a9379b2 |
| Fixed in 5.17 with commit e2b993302f40c4eb714ecf896dd9e1c5be7d4cd7 |
| |
| 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-2022-48849 |
| 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/gpu/drm/amd/amdgpu/amdgpu_display.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/fcd1d79aa943fff4fbaa0cce1d576995a7960699 |
| https://git.kernel.org/stable/c/cb29021be49858059138f75d6311a7c35a9379b2 |
| https://git.kernel.org/stable/c/e2b993302f40c4eb714ecf896dd9e1c5be7d4cd7 |
