| 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-2024-36944: Reapply "drm/qxl: simplify qxl_fence_wait" |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| Reapply "drm/qxl: simplify qxl_fence_wait" |
| |
| This reverts commit 07ed11afb68d94eadd4ffc082b97c2331307c5ea. |
| |
| Stephen Rostedt reports: |
| "I went to run my tests on my VMs and the tests hung on boot up. |
| Unfortunately, the most I ever got out was: |
| |
| [ 93.607888] Testing event system initcall: OK |
| [ 93.667730] Running tests on all trace events: |
| [ 93.669757] Testing all events: OK |
| [ 95.631064] ------------[ cut here ]------------ |
| Timed out after 60 seconds" |
| |
| and further debugging points to a possible circular locking dependency |
| between the console_owner locking and the worker pool locking. |
| |
| Reverting the commit allows Steve's VM to boot to completion again. |
| |
| [ This may obviously result in the "[TTM] Buffer eviction failed" |
| messages again, which was the reason for that original revert. But at |
| this point this seems preferable to a non-booting system... ] |
| |
| The Linux kernel CVE team has assigned CVE-2024-36944 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15.156 with commit 8d278fc34cdd8a44e995fa93dfd31d619a2e1fe6 and fixed in 5.15.159 with commit 4a89ac4b0921c4ea21eb1b4cf3a469a91bacfcea |
| Issue introduced in 6.1.87 with commit 84fb60063509e462e39c0e097c7d6dbb71c95967 and fixed in 6.1.91 with commit b548c53bc3ab83dc6fc86c8e840f013b2032267a |
| Issue introduced in 6.6.28 with commit 42cbe04a5c77da74fb7161b0ae63f1f6e105d633 and fixed in 6.6.31 with commit 148ed8b4d64f94ab079c8f0d88c3f444db97ba97 |
| Issue introduced in 6.8.7 with commit 13ab5db42a593f9904acc39055ee3ae75963fc88 and fixed in 6.8.10 with commit 3dfe35d8683daf9ba69278643efbabe40000bbf6 |
| |
| 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-2024-36944 |
| 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/qxl/qxl_release.c |
| include/linux/dma-fence.h |
| |
| |
| 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/4a89ac4b0921c4ea21eb1b4cf3a469a91bacfcea |
| https://git.kernel.org/stable/c/b548c53bc3ab83dc6fc86c8e840f013b2032267a |
| https://git.kernel.org/stable/c/148ed8b4d64f94ab079c8f0d88c3f444db97ba97 |
| https://git.kernel.org/stable/c/3dfe35d8683daf9ba69278643efbabe40000bbf6 |
| https://git.kernel.org/stable/c/3628e0383dd349f02f882e612ab6184e4bb3dc10 |
