Vulnerability in Kernel: mmmremap.c
Summary
GSD-2022-1002468: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0). Affects Kernel versions < a05540f3903bd8295e8c4cd90dd3d416239a115b. 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 interfaces with hardware devices. It is responsible for managing system resources, including memory allocation and process scheduling. The mmmremap.c file is part of the Kernel and is used for handling memory remapping operations. This vulnerability in mmmremap.c can lead to unnecessary invalidation of memory ranges when performing a specific operation.
Vulnerability Detail
The vulnerability in mmmremap.c occurs when the old_size parameter is set to 0 during the mremap operation. In this scenario, the code performs unnecessary invalidate_range_start/end operations, which can impact system performance. While the actual impact and attack plausibility have not been proven, this vulnerability has the potential to affect the stability and efficiency of the system. It is important to note that this vulnerability has been fixed in Linux Kernel version v4.9.311 by commit a05540f3903bd8295e8c4cd90dd3d416239a115b.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in the latest version of the Linux Kernel, there is no specific workaround available. It is advised to update the Kernel to the patched version.
Conclusion
The vulnerability in mmmremap.c can lead to unnecessary invalidation of memory ranges, potentially impacting system performance. It is crucial to update the Linux Kernel to the patched version to mitigate this vulnerability. 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 provides core functionalities and interfaces with hardware devices.
mmmremap.c is a file in the Kernel that handles memory remapping operations.
While the actual impact and attack plausibility have not been proven, this vulnerability has the potential to affect the stability and efficiency of the system.
Yes, this vulnerability has been fixed in Linux Kernel version v4.9.311 by commit a05540f3903bd8295e8c4cd90dd3d416239a115b.
To update the Linux Kernel, follow the official update process provided by the Linux distribution being used.
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