Fix for event handling soft lockup in iommu/arm-smmu-v3
Summary
GSD-2022-1002409: iommu/arm-smmu-v3: fix event handling soft lockup. Affects Kernel versions < 5e580cce4d58b35e0ceb875578a53b49cc2e98b1. No fix is published. How to fix ↓
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Background
The iommu/arm-smmu-v3 is a component of the Linux Kernel that provides support for the Input-Output Memory Management Unit (IOMMU) on ARM-based systems. The IOMMU is responsible for managing memory access requests from devices and ensuring their security and isolation. The arm-smmu-v3 module specifically implements the third version of the ARM System MMU (SMMU) architecture. It is used in systems with ARM processors to handle memory management for devices connected to the system. However, a vulnerability has been discovered in the event handling mechanism of the arm-smmu-v3 module, which can lead to a soft lockup of the system.
Vulnerability Detail
The vulnerability in the iommu/arm-smmu-v3 module arises from a flaw in the event handling code. When certain events occur, such as a device requesting memory access or an error condition, the module is supposed to handle these events appropriately. However, due to a bug in the code, the event handling process can get stuck in an infinite loop, causing a soft lockup of the system. This can result in the system becoming unresponsive and potentially impacting the availability of services running on the affected system. The vulnerability has been assigned the ID GSD-2022-1002409 and has been fixed in the Linux Kernel version v4.14.276 by commit 5e580cce4d58b35e0ceb875578a53b49cc2e98b1.
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. The recommended approach is to apply the fix by updating the Linux Kernel to the fixed version.
Conclusion
The iommu/arm-smmu-v3 module in the Linux Kernel is vulnerable to a soft lockup issue in the event handling code. This can result in the system becoming unresponsive and potentially impacting the availability of services. It is crucial to update the Linux Kernel to version v4.14.276 or later to fix this vulnerability. Users can obtain the updated kernel source code from the official Linux Kernel repository or wait for their Linux distribution to provide an updated package. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a soft lockup of the system, causing it to become unresponsive. This can potentially impact the availability of services running on the affected system.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze the dependencies and alert you if any vulnerabilities, including this one, are found.
At the time of this report, there is no known exploit for this vulnerability. However, it is always recommended to apply security patches and updates promptly to mitigate the risk.
The vulnerability itself does not provide remote code execution capabilities. However, if an attacker already has access to the affected system, they may be able to trigger the soft lockup condition, potentially impacting the availability of services.
If updating the kernel is not immediately feasible, it is recommended to implement other security measures such as network segmentation, access controls, and monitoring to reduce the risk of exploitation.
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