| 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-2024-26912: drm/nouveau: fix several DMA buffer leaks |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/nouveau: fix several DMA buffer leaks |
| |
| Nouveau manages GSP-RM DMA buffers with nvkm_gsp_mem objects. Several of |
| these buffers are never dealloced. Some of them can be deallocated |
| right after GSP-RM is initialized, but the rest need to stay until the |
| driver unloads. |
| |
| Also futher bullet-proof these objects by poisoning the buffer and |
| clearing the nvkm_gsp_mem object when it is deallocated. Poisoning |
| the buffer should trigger an error (or crash) from GSP-RM if it tries |
| to access the buffer after we've deallocated it, because we were wrong |
| about when it is safe to deallocate. |
| |
| Finally, change the mem->size field to a size_t because that's the same |
| type that dma_alloc_coherent expects. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26912 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.7 with commit 176fdcbddfd288408ce8571c1760ad618d962096 and fixed in 6.7.6 with commit 6190d4c08897d748dd25f0b78267a90aa1694e15 |
| Issue introduced in 6.7 with commit 176fdcbddfd288408ce8571c1760ad618d962096 and fixed in 6.8 with commit 042b5f83841fbf7ce39474412db3b5e4765a7ea7 |
| |
| 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-2024-26912 |
| 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/nouveau/include/nvkm/subdev/gsp.h |
| drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.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/6190d4c08897d748dd25f0b78267a90aa1694e15 |
| https://git.kernel.org/stable/c/042b5f83841fbf7ce39474412db3b5e4765a7ea7 |
