Deadlock in Concurrent Rename Whiteout and Inode Writeback in ubifs
Summary
GSD-2022-1002209: ubifs: Fix deadlock in concurrent rename whiteout and inode writeback. Affects Kernel versions >= 9e0a1fff8db56eaaebb74b4a3ef65f86811c4798, < 37bdf1ad592555ecda1d55b89f6e393e4c0589d1. No fix is published. How to fix ↓
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Background
The ubifs package is a file system designed for use on flash memory devices. It is commonly used in embedded systems and provides features such as wear-leveling and compression. The vulnerability in ubifs arises when there is concurrent activity involving the renaming of a whiteout file and the writeback of an inode. This can lead to a deadlock situation, where multiple processes are unable to proceed due to conflicting resource access.
Vulnerability Detail
The vulnerability occurs due to a race condition in the ubifs file system. When multiple processes attempt to rename a whiteout file and write back an inode simultaneously, they can end up waiting for each other indefinitely, resulting in a deadlock. This can potentially disrupt the normal operation of the file system and lead to resource exhaustion. The vulnerability was introduced in version v4.9 of the Linux Kernel and has been fixed in version v5.4.189.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is necessary to apply the fix by updating the Linux Kernel.
Conclusion
The vulnerability in ubifs that causes a deadlock in concurrent rename whiteout and inode writeback has been identified and fixed in Linux Kernel version v5.4.189. Users are advised to update their Linux Kernel to the latest version to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
ubifs is a file system designed for use on flash memory devices. It provides features such as wear-leveling and compression, making it suitable for embedded systems.
The vulnerability arises when there is concurrent activity involving the renaming of a whiteout file and the writeback of an inode. This can lead to a deadlock situation.
A deadlock is a situation where multiple processes are unable to proceed because each is waiting for a resource that is held by another process.
The vulnerability can disrupt the normal operation of the file system and lead to resource exhaustion.
To fix the vulnerability, update the Linux Kernel to version v5.4.189 or later.
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