ext4: fix bug_on in ext4_writepages
Summary
GSD-2022-1003839: ext4: fix bug_on in ext4_writepages. Affects Kernel versions < de1732b5c1693ad489c5d254f124f67cb775f37d. No fix is published. How to fix ↓
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Background
The ext4 package is a file system driver for the Linux kernel. It provides support for the fourth extended file system (ext4), which is commonly used in Linux distributions. The ext4 file system offers improved performance, scalability, and reliability compared to its predecessors. However, a vulnerability has been discovered in the ext4_writepages function, which could potentially lead to security issues.
Vulnerability Detail
The vulnerability in the ext4_writepages function arises from a bug_on condition. This condition can be triggered when writing pages to the ext4 file system, potentially resulting in a kernel panic or other unexpected behavior. An attacker may be able to exploit this vulnerability to crash the system or execute arbitrary code with elevated privileges. The impact and attack plausibility of this vulnerability have not been proven yet. It is important to note that this vulnerability has been fixed in the Linux Kernel version v4.19.247 by commit de1732b5c1693ad489c5d254f124f67cb775f37d.
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 patched version.
Conclusion
In conclusion, the ext4 package in the Linux Kernel has a vulnerability in the ext4_writepages function, which can be triggered by a bug_on condition. This vulnerability has the potential to cause a kernel panic or enable arbitrary code execution. It is crucial to update the Linux Kernel to version v4.19.247 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
ext4 is a file system driver for the Linux kernel, providing support for the fourth extended file system (ext4). It offers improved performance, scalability, and reliability compared to previous versions.
The ext4_writepages function is responsible for writing pages to the ext4 file system. It is a critical component of the ext4 driver.
bug_on is a macro in the Linux kernel that checks for a specific condition and triggers a kernel panic if the condition is true. It is used for debugging purposes and to catch potential issues.
The vulnerability in ext4_writepages could lead to a kernel panic or other unexpected behavior, potentially allowing an attacker to crash the system or execute arbitrary code with elevated privileges.
You can use tools like Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
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