| 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-2024-26943: nouveau/dmem: handle kcalloc() allocation failure |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| nouveau/dmem: handle kcalloc() allocation failure |
| |
| The kcalloc() in nouveau_dmem_evict_chunk() will return null if |
| the physical memory has run out. As a result, if we dereference |
| src_pfns, dst_pfns or dma_addrs, the null pointer dereference bugs |
| will happen. |
| |
| Moreover, the GPU is going away. If the kcalloc() fails, we could not |
| evict all pages mapping a chunk. So this patch adds a __GFP_NOFAIL |
| flag in kcalloc(). |
| |
| Finally, as there is no need to have physically contiguous memory, |
| this patch switches kcalloc() to kvcalloc() in order to avoid |
| failing allocations. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26943 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1 with commit 249881232e1471d28b68f9a3829acc14d150cf5d and fixed in 6.1.84 with commit 9acfd8b083a0ffbd387566800d89f55058a68af2 |
| Issue introduced in 6.1 with commit 249881232e1471d28b68f9a3829acc14d150cf5d and fixed in 6.6.24 with commit 2a84744a037b8a511d6a9055f3defddc28ff4a4d |
| Issue introduced in 6.1 with commit 249881232e1471d28b68f9a3829acc14d150cf5d and fixed in 6.7.12 with commit 5e81773757a95fc298e96cfd6d4700f07b6192a2 |
| Issue introduced in 6.1 with commit 249881232e1471d28b68f9a3829acc14d150cf5d and fixed in 6.8.3 with commit 3e82f7383e0b82a835e6b6b06a348b2bc4e2c2ee |
| Issue introduced in 6.1 with commit 249881232e1471d28b68f9a3829acc14d150cf5d and fixed in 6.9 with commit 16e87fe23d4af6df920406494ced5c0f4354567b |
| |
| 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-2024-26943 |
| 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/nouveau_dmem.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/9acfd8b083a0ffbd387566800d89f55058a68af2 |
| https://git.kernel.org/stable/c/2a84744a037b8a511d6a9055f3defddc28ff4a4d |
| https://git.kernel.org/stable/c/5e81773757a95fc298e96cfd6d4700f07b6192a2 |
| https://git.kernel.org/stable/c/3e82f7383e0b82a835e6b6b06a348b2bc4e2c2ee |
| https://git.kernel.org/stable/c/16e87fe23d4af6df920406494ced5c0f4354567b |
