Vulnerability in drm/rockchip package: Possible Null Pointer Dereference in vop_bind()
Summary
GSD-2022-1003791: drm/rockchip: vop: fix possible null-ptr-deref in vop_bind(). Affects Kernel versions >= 2048e3286f347db5667708e47448176b5329e8d8, < a9b4599665e437de8a1152799c34841b799a2e1c. No fix is published. How to fix ↓
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Background
The drm/rockchip package is a component of the Linux Kernel that provides support for Rockchip display controllers. These display controllers are commonly found in Rockchip-based devices such as tablets, smartphones, and embedded systems. The package allows for the management and control of display output, including modesetting, framebuffer management, and hardware acceleration. However, a vulnerability has been discovered in the vop_bind() function of the package, which could lead to a null pointer dereference.
Vulnerability Detail
The vulnerability in the drm/rockchip package arises from a potential null pointer dereference in the vop_bind() function. This function is responsible for binding a display controller to a display pipeline. If a null pointer is passed as an argument to this function, it can result in a crash or other undefined behavior. An attacker could potentially exploit this vulnerability to cause a denial of service or execute arbitrary code with kernel privileges. The vulnerability was introduced in version v3.19 of the Linux Kernel and has been fixed in version v5.4.198.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Linux Kernel is not immediately feasible, a possible workaround is to avoid passing a null pointer as an argument to the vop_bind() function. Developers can implement input validation checks to ensure that only valid pointers are passed to the function. Here is an example of how such a check can be implemented in C:
void vop_bind(struct display_controller *controller, struct display_pipeline *pipeline) {
if (controller == NULL || pipeline == NULL) {
// Handle error or return early
return;
}
// Rest of the function logic
}
Conclusion
The vulnerability in the drm/rockchip package's vop_bind() function poses a potential security risk, allowing for a null pointer dereference. To mitigate this vulnerability, it is crucial to update the Linux Kernel to version v5.4.198 or later. Regularly updating the Linux Kernel is recommended to ensure the latest security patches are applied. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability in the drm/rockchip package could potentially allow an attacker to cause a denial of service or execute arbitrary code with kernel privileges. This can lead to system crashes, data corruption, or unauthorized access to sensitive information.
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 Vulert will analyze it for any open-source vulnerabilities, including this one.
Yes, a patch for this vulnerability is available in version v5.4.198 of the Linux Kernel. It is recommended to update to this version or a later one to mitigate the vulnerability.
Exploiting this vulnerability typically requires local access to the system. However, if an attacker already has access to the system, they can potentially exploit the vulnerability remotely to gain kernel privileges.
There are no known instances of this vulnerability being actively exploited in the wild. However, it is important to promptly apply the necessary patches and updates to mitigate the risk.
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