Deadlock Vulnerability in sa1100_set_termios() in Linux Kernel
Summary
GSD-2022-1003940: drivers: tty: serial: Fix deadlock in sa1100_set_termios(). Affects Kernel versions < 85e20f8bd31a46d8c60103d0274a8ebe8f47f2b2. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing an interface for applications to interact with the hardware. The sa1100_set_termios() function is part of the serial driver subsystem in the kernel, specifically designed for the StrongARM SA-1100 processor. This function is responsible for setting the terminal I/O attributes for the SA-1100 serial port. However, a deadlock vulnerability has been identified in this function, which could lead to system instability and potential denial-of-service attacks.
Vulnerability Detail
The vulnerability in sa1100_set_termios() arises from a potential deadlock situation. When certain conditions are met, such as concurrent access to the serial port, the function can enter a deadlock state, where multiple threads or processes are unable to proceed, resulting in a system freeze. This vulnerability could be exploited by an attacker to disrupt the normal operation of the system or cause a denial-of-service condition. It is important to note that the impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid triggering the deadlock by ensuring that concurrent access to the affected serial port is avoided. This can be achieved by carefully managing the usage of the serial port and ensuring that only one thread or process accesses it at a time. However, this workaround may not be feasible in all scenarios and it is recommended to apply the official patch as soon as possible.
Conclusion
In conclusion, a deadlock vulnerability has been identified in the sa1100_set_termios() function of the Linux Kernel's serial driver subsystem. This vulnerability could potentially lead to system instability and denial-of-service attacks. Users are advised to update their Linux Kernel to the patched version and follow the recommended steps to mitigate the vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing an interface for applications to interact with the hardware.
sa1100_set_termios() is a function in the Linux Kernel's serial driver subsystem, specifically designed for the StrongARM SA-1100 processor. It is responsible for setting the terminal I/O attributes for the SA-1100 serial port.
A deadlock is a situation where multiple threads or processes are unable to proceed because each is waiting for the other to release a resource. This can result in a system freeze or unresponsiveness.
The vulnerability could be exploited by an attacker to disrupt the normal operation of the system or cause a denial-of-service condition. However, the actual impact and attack plausibility have not been proven yet.
To fix the vulnerability, users should update their Linux Kernel to version v4.14.283 or later, which includes the necessary patch. Instructions for obtaining and compiling the updated kernel source code can be found in the official Linux Kernel repository.
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