| 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-2024-49876: drm/xe: fix UAF around queue destruction |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/xe: fix UAF around queue destruction |
| |
| We currently do stuff like queuing the final destruction step on a |
| random system wq, which will outlive the driver instance. With bad |
| timing we can teardown the driver with one or more work workqueue still |
| being alive leading to various UAF splats. Add a fini step to ensure |
| user queues are properly torn down. At this point GuC should already be |
| nuked so queue itself should no longer be referenced from hw pov. |
| |
| v2 (Matt B) |
| - Looks much safer to use a waitqueue and then just wait for the |
| xa_array to become empty before triggering the drain. |
| |
| (cherry picked from commit 861108666cc0e999cffeab6aff17b662e68774e3) |
| |
| The Linux kernel CVE team has assigned CVE-2024-49876 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit dd08ebf6c3525a7ea2186e636df064ea47281987 and fixed in 6.10.14 with commit 272b0e78874586d6ccae04079d75b27b47705544 |
| Issue introduced in 6.8 with commit dd08ebf6c3525a7ea2186e636df064ea47281987 and fixed in 6.11.3 with commit 421c74670b0f9d5c007f1276d3647aa58f407fde |
| Issue introduced in 6.8 with commit dd08ebf6c3525a7ea2186e636df064ea47281987 and fixed in 6.12 with commit 2d2be279f1ca9e7288282d4214f16eea8a727cdb |
| |
| 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-2024-49876 |
| 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/xe/xe_device.c |
| drivers/gpu/drm/xe/xe_device_types.h |
| drivers/gpu/drm/xe/xe_guc_submit.c |
| drivers/gpu/drm/xe/xe_guc_types.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/272b0e78874586d6ccae04079d75b27b47705544 |
| https://git.kernel.org/stable/c/421c74670b0f9d5c007f1276d3647aa58f407fde |
| https://git.kernel.org/stable/c/2d2be279f1ca9e7288282d4214f16eea8a727cdb |
