Vulnerability in Kernel: mmmremap.c
Summary
GSD-2022-1002174: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0). Affects Kernel versions < c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages communication between hardware and software. It provides essential functions and services to enable the proper functioning of the system. The mmmremap.c file is part of the Kernel and is responsible for handling memory remapping operations. This vulnerability specifically affects the mremap function when the old size is set to 0.
Vulnerability Detail
The vulnerability in mmmremap.c arises from the unnecessary invocation of invalidate_range_start/end functions during the mremap operation when the old size is 0. This results in a performance overhead and potential resource wastage. While the impact and attack plausibility have not been proven, this vulnerability could potentially be exploited to cause denial of service or escalate privileges.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The vulnerability in mmmremap.c has been addressed in the Linux Kernel version v5.4.189. Users are advised to update their Kernel to the latest version to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that manages communication between hardware and software. It provides essential functions and services to enable the proper functioning of the system.
mmmremap.c is a file in the Kernel responsible for handling memory remapping operations.
The impact of this vulnerability is not yet proven, but it could potentially be exploited to cause denial of service or escalate privileges.
To fix this vulnerability, users should update their Kernel to the latest version available.
No specific workaround has been mentioned for this vulnerability.
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