| 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-2024-46710: drm/vmwgfx: Prevent unmapping active read buffers |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/vmwgfx: Prevent unmapping active read buffers |
| |
| The kms paths keep a persistent map active to read and compare the cursor |
| buffer. These maps can race with each other in simple scenario where: |
| a) buffer "a" mapped for update |
| b) buffer "a" mapped for compare |
| c) do the compare |
| d) unmap "a" for compare |
| e) update the cursor |
| f) unmap "a" for update |
| At step "e" the buffer has been unmapped and the read contents is bogus. |
| |
| Prevent unmapping of active read buffers by simply keeping a count of |
| how many paths have currently active maps and unmap only when the count |
| reaches 0. |
| |
| The Linux kernel CVE team has assigned CVE-2024-46710 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.19 with commit 485d98d472d53f9617ffdfba5e677ac29ad4fe20 and fixed in 6.1.113 with commit 58a3714db4d9dcaeb9fc4905141e17b9f536c0a5 |
| Issue introduced in 5.19 with commit 485d98d472d53f9617ffdfba5e677ac29ad4fe20 and fixed in 6.6.54 with commit 0851b1ec650adadcaa23ec96daad95a55bf966f0 |
| Issue introduced in 5.19 with commit 485d98d472d53f9617ffdfba5e677ac29ad4fe20 and fixed in 6.10.8 with commit d5228d158e4c0b1663b3983044913c15c3d0135e |
| Issue introduced in 5.19 with commit 485d98d472d53f9617ffdfba5e677ac29ad4fe20 and fixed in 6.11 with commit aba07b9a0587f50e5d3346eaa19019cf3f86c0ea |
| |
| 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-2024-46710 |
| 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/vmwgfx/vmwgfx_bo.c |
| drivers/gpu/drm/vmwgfx/vmwgfx_bo.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/58a3714db4d9dcaeb9fc4905141e17b9f536c0a5 |
| https://git.kernel.org/stable/c/0851b1ec650adadcaa23ec96daad95a55bf966f0 |
| https://git.kernel.org/stable/c/d5228d158e4c0b1663b3983044913c15c3d0135e |
| https://git.kernel.org/stable/c/aba07b9a0587f50e5d3346eaa19019cf3f86c0ea |
