ALSA: pcm: Fix races among concurrent hw_params and hw_free calls
Summary
GSD-2022-1001634: ALSA: pcm: Fix races among concurrent hw_params and hw_free calls. Affects Kernel versions < 0090c13cbbdffd7da079ac56f80373a9a1be0bf8. No fix is published. How to fix ↓
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Background
The ALSA (Advanced Linux Sound Architecture) package is responsible for providing audio functionality in the Linux kernel. It includes drivers, libraries, and utilities for audio devices. 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 data is processed and transferred between applications and audio hardware through the pcm component.
Vulnerability Detail
The vulnerability in ALSA's pcm component involves races among concurrent hw_params and hw_free calls. This means that when multiple processes or threads attempt to modify the hardware parameters (hw_params) or free the hardware resources (hw_free) of the PCM audio device simultaneously, race conditions can occur. These race conditions can lead to inconsistent or corrupted data, resulting in potential audio playback or recording issues. The impact and attack plausibility of this vulnerability have not yet been proven.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
The vulnerability in ALSA's pcm component, which involves races among concurrent hw_params and hw_free calls, has been fixed in Linux Kernel version v5.16.18. Users should update their Linux Kernel to the fixed version to mitigate the potential audio playback or recording issues. For further support on vulnerability remediation, contact DevNack.com.
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FAQ
ALSA (Advanced Linux Sound Architecture) is a software framework and part of the Linux kernel that provides audio functionality for Linux-based systems. It includes drivers, libraries, and utilities for audio devices.
The pcm component in ALSA handles PCM (Pulse Code Modulation) audio data, which is the standard format for digital audio in computers and other digital audio devices. It processes and transfers PCM data between applications and audio hardware.
hw_params and hw_free are functions in ALSA's pcm component. hw_params is used to set the hardware parameters of the PCM audio device, such as sample rate and channel configuration. hw_free is used to release the hardware resources used by the PCM audio device.
Race conditions occur when multiple processes or threads access shared resources concurrently and the outcome of their execution depends on the order in which the operations are executed. In the case of this vulnerability, race conditions can lead to inconsistent or corrupted data when modifying hardware parameters or freeing hardware resources of the PCM audio device.
To fix the vulnerability, update your Linux Kernel to version v5.16.18 or later. Download the updated kernel source code from the official Linux Kernel repository and compile it for your system. Refer to the official documentation for detailed instructions on how to compile and install the Linux Kernel.
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