Fix crashes when toggling entry flush barrier in Linux Kernel
Summary
GSD-2021-1000489: powerpc/64s: Fix crashes when toggling entry flush barrier. Affects Kernel versions >= 4a1e90af718d1489ffcecc8f52486c4f5dc0f7a6, < 8382b15864e5014261b4f36c2aa89723612ee058. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for hardware abstraction, process management, memory management, and device drivers. The powerpc/64s component within the Linux Kernel is responsible for supporting the PowerPC architecture on 64-bit systems. It includes features such as entry flush barrier toggling, which helps ensure data consistency during context switches. However, a vulnerability has been discovered in this component that can lead to crashes when toggling the entry flush barrier.
Vulnerability Detail
The vulnerability in powerpc/64s within the Linux Kernel can result in crashes when toggling the entry flush barrier. This issue was introduced in version v4.4.245 of the Linux Kernel by commit 4a1e90af718d1489ffcecc8f52486c4f5dc0f7a6 and is fixed in version v4.4.269 by commit 8382b15864e5014261b4f36c2aa89723612ee058. The impact and attack plausibility of this vulnerability have not yet been proven. However, it is crucial to address this issue to ensure system stability and prevent potential exploitation.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
The vulnerability in powerpc/64s within the Linux Kernel, which can lead to crashes when toggling the entry flush barrier, should be addressed by updating the Linux Kernel to version v4.4.269 or later. This will ensure system stability and mitigate the potential for exploitation. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Linux Kernel is an open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for hardware abstraction, process management, memory management, and device drivers.
powerpc/64s is a component within the Linux Kernel that supports the PowerPC architecture on 64-bit systems. It includes features such as entry flush barrier toggling, which helps ensure data consistency during context switches.
The impact of this vulnerability is not yet proven. However, it can lead to crashes when toggling the entry flush barrier in powerpc/64s within the Linux Kernel.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v4.4.269 or later. This can be done by obtaining the updated kernel source code from the official Linux Kernel repository and compiling it according to the provided instructions.
No specific workaround has been mentioned for this vulnerability.
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