| 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-2024-56695: drm/amdkfd: Use dynamic allocation for CU occupancy array in 'kfd_get_cu_occupancy()' |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amdkfd: Use dynamic allocation for CU occupancy array in 'kfd_get_cu_occupancy()' |
| |
| The `kfd_get_cu_occupancy` function previously declared a large |
| `cu_occupancy` array as a local variable, which could lead to stack |
| overflows due to excessive stack usage. This commit replaces the static |
| array allocation with dynamic memory allocation using `kcalloc`, |
| thereby reducing the stack size. |
| |
| This change avoids the risk of stack overflows in kernel space, in |
| scenarios where `AMDGPU_MAX_QUEUES` is large. The allocated memory is |
| freed using `kfree` before the function returns to prevent memory |
| leaks. |
| |
| Fixes the below with gcc W=1: |
| drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_process.c: In function ‘kfd_get_cu_occupancy’: |
| drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_process.c:322:1: warning: the frame size of 1056 bytes is larger than 1024 bytes [-Wframe-larger-than=] |
| 322 | } |
| | ^ |
| |
| The Linux kernel CVE team has assigned CVE-2024-56695 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.12 with commit 6ae9e1aba97e4cdaa31a0bfdc07497ad0e915c84 and fixed in 6.12.2 with commit 6d9f07196389f35a3afebcf1a12c1425725caddd |
| Issue introduced in 6.12 with commit 6ae9e1aba97e4cdaa31a0bfdc07497ad0e915c84 and fixed in 6.13 with commit 922f0e00017b09d9d47e3efac008c8b20ed546a0 |
| |
| 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-2024-56695 |
| 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/amd/amdkfd/kfd_process.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/6d9f07196389f35a3afebcf1a12c1425725caddd |
| https://git.kernel.org/stable/c/922f0e00017b09d9d47e3efac008c8b20ed546a0 |
