Vulnerability in Kernel package: gpio: Restrict usage of GPIO chip irq members before initialization
Summary
GSD-2022-1001342: gpio: Restrict usage of GPIO chip irq members before initialization. Affects Kernel versions < 2c1fa3614795e2b24da1ba95de0b27b8f6ea4537. No fix is published. How to fix ↓
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Background
The Kernel package is a fundamental component of the Linux operating system, responsible for managing the system's core functionality. It provides an interface between hardware and software, allowing applications to communicate with the underlying hardware. The gpio module within the Kernel package enables the control and manipulation of General Purpose Input/Output (GPIO) pins on various devices. These pins are used for connecting external components and peripherals to the system. However, a vulnerability has been identified in the gpio module that allows unauthorized access to GPIO chip irq members before they are properly initialized.
Vulnerability Detail
The vulnerability in the gpio module arises from a lack of proper restriction on the usage of GPIO chip irq members before they are initialized. This can potentially lead to unauthorized access and manipulation of GPIO pins, which could have various ramifications depending on the specific hardware and software configurations. An attacker may exploit this vulnerability to gain control over connected devices, disrupt system operations, or even execute arbitrary code. The vulnerability has been addressed in the Linux Kernel version v5.16.20 through commit 2c1fa3614795e2b24da1ba95de0b27b8f6ea4537.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the usage of GPIO chip irq members until they are properly initialized. This can be achieved by modifying the relevant code in the gpio module to restrict access to these members before initialization. Here is an example of how the code can be modified:
// Restrict usage of GPIO chip irq members
if (!gpio_chip_initialized) {
// Disable access to irq members
gpio_chip.irq = NULL;
}
Conclusion
The vulnerability in the gpio module of the Kernel package can potentially allow unauthorized access and manipulation of GPIO pins. It is crucial to update the Kernel package to version v5.16.20 or later to mitigate this vulnerability. Alternatively, users can apply the specific commit addressing the vulnerability to their Kernel source code. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
The gpio module is a component of the Kernel package that allows control and manipulation of General Purpose Input/Output (GPIO) pins on various devices. These pins are used for connecting external components and peripherals to the system.
This vulnerability allows unauthorized access to GPIO chip irq members before they are properly initialized. It can potentially lead to unauthorized control over connected devices, disruption of system operations, or execution of arbitrary code.
To fix this vulnerability, it is recommended to update the Kernel package to version v5.16.20 or later. Alternatively, users can manually apply the commit 2c1fa3614795e2b24da1ba95de0b27b8f6ea4537 to their Kernel source code and rebuild the Kernel.
Yes, a workaround is to disable the usage of GPIO chip irq members until they are properly initialized. This can be achieved by modifying the relevant code in the gpio module to restrict access to these members before initialization.
For more information about this vulnerability, you can refer to the official Linux Kernel documentation, security advisories, or the commit 2c1fa3614795e2b24da1ba95de0b27b8f6ea4537 in the Kernel source code repository.
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