Vulnerability in Kernel: mm, thp: bail out early in collapse_file for writeback page
Summary
GSD-2021-1002194: mm, thp: bail out early in collapse_file for writeback page. Affects Kernel versions >= 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0, < 74c42e1baacf206338b1dd6b6199ac964512b5bb. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It manages system resources, memory, and processes. The mm (memory management) subsystem within the Kernel is responsible for managing memory allocation and deallocation. Transparent Huge Pages (THP) is a feature in the mm subsystem that allows for efficient memory management by grouping multiple smaller pages into larger ones. However, a vulnerability has been discovered in the mm, thp component of the Kernel that can lead to potential security risks.
Vulnerability Detail
The vulnerability in the mm, thp component of the Kernel arises from a flaw in the collapse_file function during the writeback page process. This flaw can be exploited by an attacker to trigger a specific sequence of events that may result in a security breach. While the exact impact and attack plausibility have not been proven, it is crucial to address this vulnerability to ensure the integrity and security of the system. The vulnerability was introduced in version v5.4 of the Linux Kernel and has been fixed in version v5.15 through commit 74c42e1baacf206338b1dd6b6199ac964512b5bb.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can consider disabling the Transparent Huge Pages (THP) feature in the Kernel. This can be achieved by modifying the Kernel configuration or using kernel boot parameters. However, it is important to note that disabling THP may impact system performance and should be evaluated based on individual requirements.
Conclusion
The vulnerability in the mm, thp component of the Kernel poses a potential security risk and should be addressed by updating the Linux Kernel to version v5.15 or later. Disabling the Transparent Huge Pages (THP) feature can serve as a temporary workaround, but it may impact system performance. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software.
The mm (memory management) subsystem is responsible for managing memory allocation and deallocation in the Kernel.
Transparent Huge Pages (THP) is a feature in the mm subsystem that allows for efficient memory management by grouping multiple smaller pages into larger ones.
The vulnerability can be exploited by an attacker to trigger a specific sequence of events during the writeback page process, potentially leading to a security breach.
Yes, the vulnerability has been fixed in version v5.15 of the Linux Kernel through commit 74c42e1baacf206338b1dd6b6199ac964512b5bb.
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