Linux Kernel Btrfs日志记录逻辑错误致数据丢失

#!/bin/bash # PoC for CVE-2026-23465 # Reproduces Btrfs dentry loss after log replay mkdir foo sync rmdir foo mkdir dir1 mkdir dir2 # Create a file with the same name as the deleted directory # This creates a conflicting inode scenario touch foo ln foo dir2/link # Fsync dir2 triggers logging parent without new dentries xfs_io -c "fsync" dir2 # Fsync current dir is a no-op due to previous step xfs_io -c "fsync" . # Simulate power failure here # After reboot, 'dir1' will be missing