CVE-2025-38716 in Linux
Resumen
por VulDB • 2026-05-31
Based on the kernel log snippet provided, here is an analysis of the issue:
### **Summary** The system is attempting to mount an **HFS+ filesystem** (commonly used on macOS) via the `mount` system call, but it is crashing or hanging in the `hfs_fill_super` function. The trace shows a call stack leading up to `hfs_fill_super`, which is responsible for initializing the HFS filesystem superblock.
### **Key Observations** 1. **Filesystem**: `hfs` (HFS/HFS+ driver). 2. **Function**: `hfs_fill_super+0x38e/0x720` – This is where the crash/oops occurs. 3. **Context**: The mount is being initiated via `__x64_sys_mount` → `path_mount` → `vfs_get_tree` → `get_tree_bdev_flags` → `hfs_fill_super`. 4. **Potential Causes**: - **Corrupted HFS+ Volume**: The HFS+ metadata (catalog file, extent overflow file, etc.) may be damaged, causing the driver to read invalid data. - **Bug in HFS Driver**: There may be a bug in the kernel’s HFS driver when handling certain edge cases (e.g., unusual block sizes, corrupted extents, or specific HFS+ versions). - **Memory Corruption**: Less likely, but possible if other subsystems are involved. - **Locking Issue**: The presence of `find_held_lock` and `lockdep_init_map_type` in the trace suggests the kernel’s lockdep subsystem is active, which might indicate a locking imbalance or deadlock, though the crash itself is likely in `hfs_fill_super`.
### **Recommended Actions** 1. **Check dmesg for More Context**: - Look for earlier messages in `dmesg` that might indicate why the mount failed (e.g., I/O errors, bad superblock). - Check if there are any `BUG: unable to handle kernel paging request` or similar oops messages.
2. **Verify the HFS+ Volume**: - If possible, mount the volume on a macOS system and run `diskutil verifyVolume` or `fsck_hfs` to check for corruption. - If the volume is critical, consider creating a disk image (`dd`) before attempting further repairs.
3. **Update Kernel**: - Ensure you are running a recent kernel version. The HFS driver has had bugs fixed in recent years. Check if your distribution has a newer kernel available.
4. **Alternative Mount Options**: - Try mounting with `ro` (read-only) to avoid further corruption: ```bash sudo mount -t hfs -o ro /dev/sdXN /mnt/hfs ``` - If `hfs` fails, try `hfsplus` (if available in your kernel): ```bash sudo mount -t hfsplus -o ro /dev/sdXN /mnt/hfs ```
5. **Debugging**: - If you are a developer, enable kernel debugging symbols and reproduce the issue to get a full backtrace. - Check if the issue is reproducible with a specific file or directory on the HFS+ volume.
### **Note** The HFS driver in Linux is not as mature as ext4 or xfs, and it may have limitations or bugs with certain HFS+ features. If the volume is not critical, consider using a different filesystem for future use.
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