Vulnerability in drm/msm/mdp5 Package: Return Error Code in mdp5_pipe_release when Deadlock is Detected
Summary
GSD-2022-1003623: drm/msm/mdp5: Return error code in mdp5_pipe_release when deadlock is detected. Affects Kernel versions >= 7907a0d77cb461f58045763c205a5830be72e97c, < 49dc28b4b2e28ef7564e355c91487996c1cbebd7. No fix is published. How to fix ↓
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Background
The drm/msm/mdp5 package is a component of the Linux Kernel that provides support for display controllers in Qualcomm Snapdragon SoCs. It is responsible for managing the display pipelines and ensuring the proper rendering of graphics on the screen. The mdp5_pipe_release function in this package is used to release a display pipeline when it is no longer needed. However, a vulnerability has been discovered in this function that can lead to a deadlock condition. This deadlock can occur when multiple threads try to release the same pipeline simultaneously, causing them to wait indefinitely for each other to complete.
Vulnerability Detail
The vulnerability in the drm/msm/mdp5 package allows for a deadlock condition to occur when releasing display pipelines. This can be exploited by an attacker to cause a denial of service (DoS) by intentionally triggering the deadlock. The impact of this vulnerability is limited to systems that use Qualcomm Snapdragon SoCs and have the affected package enabled. The vulnerability was introduced in version v4.18 of the Linux Kernel and has been fixed in version v5.10.121. The fix ensures that an error code is returned when a deadlock is detected, preventing the threads from waiting indefinitely.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.121 or later. This can be done by downloading the latest kernel source code from the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and compiling it for your system. Alternatively, you can check if your system's package manager provides an updated version of the kernel and install it through the package manager.
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Workaround
There is no known workaround for this vulnerability. It is recommended to apply the fix mentioned above by updating the Linux Kernel.
Conclusion
In conclusion, the vulnerability in the drm/msm/mdp5 package can lead to a deadlock condition when releasing display pipelines. This can result in a denial of service (DoS) by freezing the affected system. To mitigate this vulnerability, it is crucial to update the Linux Kernel to version v5.10.121 or later. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The vulnerability can lead to a deadlock condition, causing a denial of service (DoS) by freezing the affected system.
Systems that use Qualcomm Snapdragon SoCs and have the drm/msm/mdp5 package enabled are affected.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the tool will analyze it for vulnerabilities.
There is no known exploit for this vulnerability at the moment. However, it is still recommended to apply the fix to prevent any potential exploitation.
There is no known workaround for this vulnerability. It is recommended to update the Linux Kernel to the fixed version.
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