f2fs: quota: fix loop condition at f2fs_quota_sync()
Summary
GSD-2022-1002141: f2fs: quota: fix loop condition at f2fs_quota_sync(). Affects Kernel versions >= 2d586a3f5b7ec2f5a939db4abc9aa053c237545c, < e58ee6bd939b773675240f5d0f5b88a367c037c4. No fix is published. How to fix ↓
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Background
The f2fs package is a file system designed for flash-based storage devices in the Linux Kernel. It provides efficient and reliable storage management for devices such as solid-state drives (SSDs). The f2fs_quota_sync() function is responsible for synchronizing the quota information of the file system. Quota management is crucial for limiting and monitoring disk space usage by users or groups. However, a loop condition in the f2fs_quota_sync() function can lead to incorrect synchronization of quota information, potentially allowing users to exceed their allocated disk space or bypass quota restrictions.
Vulnerability Detail
The vulnerability in the f2fs package arises from a loop condition in the f2fs_quota_sync() function. This loop condition is not properly checked, leading to incorrect synchronization of quota information. As a result, users may be able to exceed their allocated disk space or bypass quota restrictions. This could have significant consequences in multi-user environments where disk space needs to be managed and allocated fairly. An attacker could potentially abuse this vulnerability to consume excessive disk space or evade quota limitations, impacting the availability and performance of the file system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable quota management for the f2fs file system until the kernel is updated. This can be achieved by modifying the /etc/fstab file and removing the 'usrquota' or 'grpquota' options for the f2fs file system. However, it is important to note that disabling quota management may impact the ability to enforce disk space limits and monitor usage.
Conclusion
The f2fs package in the Linux Kernel is vulnerable to a loop condition in the f2fs_quota_sync() function, which can result in incorrect synchronization of quota information. This vulnerability can be mitigated by updating the kernel to version v5.10.110 or later. As a temporary workaround, users can disable quota management for the f2fs file system. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows users to exceed their allocated disk space or bypass quota restrictions, potentially leading to disk space exhaustion and performance degradation.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert analyzes the manifest file like package-lock.json to identify and alert for open-source vulnerabilities in software.
Yes, the vulnerability has been fixed in Linux Kernel version v5.10.110. It is recommended to update the kernel to this version or later to mitigate the vulnerability.
Yes, you can disable quota management for the f2fs file system as a temporary workaround. However, this may impact the ability to enforce disk space limits and monitor usage.
There are no known exploits for this vulnerability at the moment. However, it is important to apply the fix as soon as possible to prevent potential abuse.
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