ALSA: pcm: Fix potential AB/BA lock with buffer_mutex and mmap_lock
Summary
GSD-2022-1002132: ALSA: pcm: Fix potential AB/BA lock with buffer_mutex and mmap_lock. Affects Kernel versions >= 8527c8f052fb42091c6569cb928e472376a4a889, < 9017201e8d8c6d1472273361389ed431188584a0. No fix is published. How to fix ↓
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Background
The ALSA (Advanced Linux Sound Architecture) package is responsible for providing audio and MIDI functionality to the Linux operating system. It includes drivers, libraries, and utilities for sound card configuration and audio playback. The pcm component within ALSA handles the PCM (Pulse Code Modulation) audio data, which is the standard format for digital audio in computers and other digital audio devices. PCM audio data is processed and played back by the sound card hardware.
The vulnerability in the pcm component of ALSA arises from a potential AB/BA lock with the buffer_mutex and mmap_lock. This lock issue can lead to race conditions and potential deadlock scenarios, impacting the stability and reliability of audio playback. An attacker may be able to exploit this vulnerability to cause a denial-of-service (DoS) condition or potentially execute arbitrary code.
Vulnerability Detail
The vulnerability in ALSA's pcm component is caused by a potential AB/BA lock with the buffer_mutex and mmap_lock. This lock issue can occur when multiple threads or processes attempt to access the PCM audio buffer simultaneously, leading to race conditions and potential deadlocks. If an attacker can trigger this vulnerability, they may be able to disrupt audio playback, cause a DoS condition, or potentially execute arbitrary code.
The vulnerability was introduced in version v5.10.109 of the Linux Kernel by commit 8527c8f052fb42091c6569cb928e472376a4a889. It was fixed in version v5.10.110 by commit 9017201e8d8c6d1472273361389ed431188584a0.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround provided for this vulnerability. However, users can mitigate the risk by ensuring that their systems are updated with the latest Linux Kernel version (v5.10.110 or later) that includes the fix for this vulnerability.
Conclusion
The vulnerability in ALSA's pcm component, which involves a potential AB/BA lock with the buffer_mutex and mmap_lock, can lead to race conditions, deadlocks, and potential security risks. It is crucial to update the Linux Kernel to version v5.10.110 or later to mitigate this vulnerability and ensure stable and secure audio playback. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
ALSA (Advanced Linux Sound Architecture) is a software framework and API for providing audio and MIDI functionality to the Linux operating system. It includes drivers, libraries, and utilities for sound card configuration and audio playback.
The pcm component in ALSA handles the PCM (Pulse Code Modulation) audio data, which is the standard format for digital audio in computers and other digital audio devices. PCM audio data is processed and played back by the sound card hardware.
An AB/BA lock issue refers to a potential deadlock scenario that can occur when multiple threads or processes attempt to acquire locks in a specific order. In this vulnerability, the AB/BA lock issue arises between the buffer_mutex and mmap_lock in the pcm component of ALSA, potentially leading to race conditions and deadlocks.
This vulnerability can impact the stability and reliability of audio playback in Linux systems. It can potentially cause a denial-of-service (DoS) condition, disrupt audio playback, or even allow an attacker to execute arbitrary code.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.110 or later. This update includes the necessary fix commit (9017201e8d8c6d1472273361389ed431188584a0) that addresses the AB/BA lock issue in the pcm component of ALSA.
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