CVE-2024-56753: Resolving Linux Kernel Vulnerability in drm/amdgpu/gfx9 Module

In the world of Linux and open-source software, security is always a top priority. Recently, a vulnerability has been discovered in the Linux kernel, specifically within the drm/amdgpu/gfx9 module. This module is responsible for handling graphics processing for AMD GPUs based on the GFX9 architecture. The vulnerability in question has since been resolved and is detailed below.

Vulnerability Description

The vulnerability affects the cleaner shader deinitialization function (gfx_v9__sw_fini) in the gfx_v9_ module of Linux kernel, which had an omission in the cleaner shader support for GFX9 hardware. This oversight led to the cleaner shader not being deinitialized correctly, causing potential memory leaks and the GPU state to be unclean for the next initialization sequence.

Exploit Details

The exploit primarily impacts AMD GPU users who are utilizing GFX9 hardware and running the open-source Linux kernel. If exploited, an attacker could trigger memory leaks and cause unclean GPU states which could impact system performance or lead to other unpredictable behavior.

Patch and Code Snippet

In order to resolve this vulnerability, the following commit was made to add the missing deinitialization code for the cleaner shader in the gfx_v9__sw_fini function:

amdgpu_gfx_cleaner_shader_sw_fini(adev);

This one-line addition ensures that any allocated resources for the cleaner shader are freed correctly, avoiding potential memory leaks and ensuring that the GPU state is clean for the next initialization sequence.

Original References and Resources

The official patch for this vulnerability can be found on the Linux Kernel Mailing List, under the title "drm/amdgpu/gfx9: Add Cleaner Shader Deinitialization in gfx_v9_ Module". The commit can also be viewed on the Linux Kernel Git Repository.

Additional information regarding the GFX9 architecture and AMD GPU support in the Linux kernel can be found in the AMD GPU Documentation and the Radeon Driver Wiki.

Conclusion

In conclusion, CVE-2024-56753 is an important Linux kernel vulnerability affecting AMD GPUs with GFX9 hardware. The patch to resolve this issue has been implemented in the Linux kernel, ensuring proper deinitialization of the cleaner shader and preventing potential memory leaks. It is highly recommended to update your Linux kernel to the latest version to avoid any issues related to this vulnerability.

Timeline

Published on: 12/29/2024 12:15:08 UTC
Last modified on: 01/06/2025 19:13:38 UTC