CVE-2024-56695

/// Technical 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 | }

| ^

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References