ALSA: pcm: Fix races among concurrent hw_params and hw_free calls
Summary
GSD-2022-1002151: ALSA: pcm: Fix races among concurrent hw_params and hw_free calls. Affects Kernel versions < 0f6947f5f5208f6ebd4d76a82a4757e2839a23f8. No fix is published. How to fix ↓
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Background
The ALSA (Advanced Linux Sound Architecture) is a software framework and part of the Linux kernel that provides an API for sound card drivers. It enables audio and MIDI functionality on Linux-based systems. The PCM (Pulse Code Modulation) subsystem within ALSA handles audio data streaming between applications and sound hardware. It allows applications to configure and control audio parameters such as sample rate, format, and channel count. However, a vulnerability has been discovered in the PCM subsystem that can lead to races among concurrent hw_params and hw_free calls.
Vulnerability Detail
The vulnerability in the ALSA PCM subsystem arises due to improper handling of concurrent hw_params and hw_free calls. When multiple threads or processes attempt to configure audio parameters (hw_params) and release resources (hw_free) simultaneously, a race condition occurs. This race condition can result in memory corruption, leading to potential crashes, privilege escalation, or other security issues. The vulnerability has been identified in the Linux Kernel version prior to v5.10.109.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Linux Kernel is not immediately feasible, a possible workaround is to avoid concurrent execution of hw_params and hw_free calls. This can be achieved by implementing proper synchronization mechanisms, such as using locks or semaphores, to ensure that only one thread or process accesses the PCM subsystem at a time. By serializing the execution of these calls, the race condition can be mitigated.
Conclusion
The ALSA PCM subsystem vulnerability, which involves races among concurrent hw_params and hw_free calls, can lead to memory corruption and various security risks. It is crucial to update the Linux Kernel to version v5.10.109 or later to mitigate this vulnerability. If immediate kernel update is not possible, implementing proper synchronization mechanisms to avoid concurrent execution of hw_params and hw_free calls can serve as a temporary workaround. 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 part of the Linux kernel that provides an API for sound card drivers and enables audio and MIDI functionality on Linux-based systems.
The PCM (Pulse Code Modulation) subsystem within ALSA handles audio data streaming between applications and sound hardware. It allows applications to configure and control audio parameters such as sample rate, format, and channel count.
The vulnerability can result in memory corruption, leading to potential crashes, privilege escalation, or other security issues.
The vulnerability is present in Linux Kernel versions prior to v5.10.109.
To fix this vulnerability, update the Linux Kernel to version v5.10.109 or later.
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