Linux nilfs2 symlink deadlock fix via GFP flag adjustment

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Issue Description: A potential deadlock issue exists in nilfs2, particularly when creating new symbolic links. - Cause: The function is called within the function, leading to circular lock dependencies during memory reclamation, which results in a deadlock between reader/writer semaphores. - Impact: This deadlock occurs when the GFP flags of newly created symbolic links are overwritten to . 2. Solution: - Fix: Remove the flag from the page cache GFP flags of newly created symbolic links, similar to what is done in and , to avoid deadlocks. - Mechanism: This ensures that no deadlock occurs during the creation of new symbolic links. 3. Related Links: - Original Report: https://lkml.kernel.org/r/20241020050003.4308-1-konishi.ryusuke@gmail.com - Fix Patch: https://lkml.kernel.org/r/20241020050003.4308-1-konishi.ryusuke@gmail.com - Reporter: syzbot+9ef37ac20608f4836256@syzkaller.appspotmail.com - Tester: syzbot+9ef37ac20608f4836256@syzkaller.appspotmail.com 4. Patch Content: - Modified File: - Changes: The flag was removed in the function. 5. Patch Application: - Application Method: Apply the patch using the tool with the following command: 6. Patch Status: - Status: Fixed; the patch has been applied to the kernel source code. With this information, we can understand the detailed nature of the vulnerability, the mitigation approach, and how to apply the patch to resolve the issue.

Goal Reached Thanks to every supporter — we hit 100%!

Linux nilfs2 symlink deadlock fix via GFP flag adjustment