Deadlock Vulnerability in Linux Kernel
Summary
GSD-2022-1002709: tty: fix deadlock caused by calling printk() under tty_port->lock. Affects Kernel versions >= b6da31b2c07c46f2dcad1d86caa835227a16d9ff, < 0bcf44903ef4df742dcada86ccaedd25374ffb50. 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. It is widely used in various devices, including servers, desktops, and embedded systems. The vulnerability in question affects the tty subsystem of the Linux Kernel, which is responsible for handling terminal devices and serial ports. The tty subsystem plays a crucial role in providing terminal emulation and input/output functionalities to user applications.
Vulnerability Detail
The vulnerability identified as GSD-2022-1002709 is a deadlock issue caused by calling printk() under tty_port->lock. When the printk() function is invoked while holding the tty_port->lock, it can lead to a deadlock situation. This occurs because printk() internally acquires the console_sem lock, which can cause a circular dependency with the tty_port->lock. As a result, the system can become unresponsive or experience a significant delay in processing other tasks. An attacker with local access to the affected system could potentially exploit this vulnerability to cause a denial-of-service (DoS) condition or disrupt normal system operation.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can avoid triggering the deadlock by refraining from calling printk() while holding the tty_port->lock. If it is necessary to print debug or informational messages from within the locked section, an alternative approach can be used. One possible solution is to temporarily release the tty_port->lock before invoking printk() and reacquire it afterward. However, this workaround may introduce additional complexity and should be carefully implemented to avoid potential race conditions or other synchronization issues.
Conclusion
In conclusion, the identified deadlock vulnerability in the Linux Kernel's tty subsystem can lead to system unresponsiveness or delays when calling printk() under tty_port->lock. It is crucial to update the Linux Kernel to the latest stable version to mitigate this vulnerability. Users can obtain the updated kernel source code from the official Linux Kernel repository or wait for their Linux distribution to provide a patched kernel package. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a deadlock situation, causing the system to become unresponsive or experience significant delays. This can result in a denial-of-service (DoS) condition or disrupt normal system operation.
An attacker with local access to the affected system can potentially exploit this vulnerability.
No, remote exploitation of this vulnerability is not possible as it requires local access to the system.
There is no evidence of active exploitation of this vulnerability in the wild at the time of this report.
The recommended mitigation is to update the Linux Kernel to the latest stable version, which includes the fix for this vulnerability.
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