Null Pointer Dereference in sh_pfc_map_resources() in pinctrl: renesas: core
Summary
GSD-2022-1003048: pinctrl: renesas: core: Fix possible null-ptr-deref in sh_pfc_map_resources(). Affects Kernel versions >= c7977ec4a33633c8e8d9267dd014356cf857351c, < e3a1ad8fd0ac11f4fa1260c23b5db71a25473254. No fix is published. How to fix ↓
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Background
The pinctrl: renesas: core package is a component of the Linux Kernel that provides support for pin control on Renesas platforms. It allows users to configure and manage the multiplexing of pins on these platforms. The sh_pfc_map_resources() function within this package is responsible for mapping pin resources. However, a vulnerability has been identified in this function that could lead to a null pointer dereference.
Vulnerability Detail
The vulnerability in sh_pfc_map_resources() arises from the possibility of a null pointer dereference. If a null pointer is passed as an argument to this function, it can result in a crash or system instability. An attacker may be able to exploit this vulnerability to cause a denial-of-service (DoS) condition or potentially execute arbitrary code with kernel privileges. The vulnerability was introduced in version v4.3 of the Linux Kernel and has been fixed in version v5.17.14.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can avoid passing a null pointer as an argument to the sh_pfc_map_resources() function. This can be achieved by validating the input before calling the function and ensuring a valid pointer is provided. Here is an example of how this can be done in C:
if (ptr != NULL) {
sh_pfc_map_resources(ptr);
}
Conclusion
The null pointer dereference vulnerability in sh_pfc_map_resources() within the pinctrl: renesas: core package of the Linux Kernel can lead to system crashes, instability, and potential privilege escalation. It is crucial to update the Linux Kernel to version v5.17.14 or later to mitigate this vulnerability. Additionally, validating input and avoiding null pointers as arguments can serve as a temporary workaround. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a crash or system instability, potentially resulting in a denial-of-service (DoS) condition. In some cases, an attacker may be able to exploit this vulnerability to execute arbitrary code with kernel privileges.
You can use the Vulert Playground at Vulert 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 has been released in version v5.17.14 of the Linux Kernel. It is recommended to update to this version or a later one to mitigate the risk.
Yes, you can avoid passing a null pointer as an argument to the sh_pfc_map_resources() function. By validating the input and ensuring a valid pointer is provided, you can mitigate the risk of this vulnerability.
You can find more information about this vulnerability in the GSD-2022-1003048 entry of the GSD Database maintained by the Cloud Security Alliance. The link to the entry is available in the vulnerability details section.
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