CVE-2024-56548 in Linux
摘要
由 VulDB • 2026-06-30
Based on the kernel stack trace provided, here is an analysis of what happened and how to troubleshoot it.
### **Summary** The system attempted to mount a filesystem (specifically **HFS+**, indicated by `hfsplus_fill_super`), but the operation failed with error code **-22 (`EINVAL`, Invalid Argument)** or potentially **-5 (`EIO`, Input/output error)**, as suggested by the return value in `RAX`. The crash/panic occurred during the mount syscall path.
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### **Key Details from Stack Trace**
1. **Filesystem Type**: - `hfsplus_fill_super` → This is an **HFS+ (Mac OS Extended)** filesystem driver. - You are likely trying to mount a macOS disk image, partition, or external drive formatted with HFS+.
2. **Error Code in RAX**: ``` [ 419.975048] RAX: ffffffffffffffda ... ORIG_RAX: 00000000000000a5
``` - `ORIG_RAX: 0xa5` = System call number **165** (`sys_mount`). - `RAX: ffffffffffffffda` = Return value **-22**. - In Linux, `-22` corresponds to **`EINVAL` (Invalid Argument)**.
3. **Call Path**: The mount failed during the superblock initialization phase (`hfsplus_fill_super`) after basic device setup (`mount_bdev`, `sb_set_blocksize`). This suggests: - The block device exists and is accessible at a low level. - The HFS+ driver rejected the filesystem structure as invalid or corrupted.
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### **Common Causes for `-EINVAL` in HFS+ Mount**
1. **Corrupted Superblock**: The HFS+ volume header (superblock) may be damaged, inconsistent, or not recognized by the kernel’s hfsplus driver.
2. **Unsupported Features**: - The disk was formatted with a newer macOS feature (e.g., APFS instead of HFS+, though `hfsplus` wouldn’t even try to mount APFS). - Journaling issues: If the volume is journaled and not cleanly unmounted, Linux may refuse to mount it read-write or sometimes fail entirely.
3. **Wrong Device**: You might be trying to mount a partition that isn’t HFS+ (e.g., an APFS container, EFI system partition, or raw disk image with wrong offset).
4. **Kernel Bug/Driver Issue**: Rarely, this can indicate a bug in the `hfsplus` module handling malformed metadata.
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### **Troubleshooting Steps**
#### ✅ 1. Verify the Filesystem Type Check what’s actually on the device: ```bash sudo blkid /dev/sdXN # Replace sdXN with your partition, e.g., sda2 # or file -sL /dev/sdXN ``` - If it says `APFS`, you **cannot** mount it with `hfsplus`. Use `apfs-fuse` or convert the disk. - If it says `HFS+ (Mac OS Extended)`, proceed below.
#### ✅ 2. Try Mounting Read-Only First Sometimes read-only mounts bypass journal checks: ```bash sudo mount -t hfsplus -o ro /dev/sdXN /mnt/point ```
#### ✅ 3. Check Kernel Logs for More Details Look at `dmesg` immediately after the failure: ```bash dmesg | tail -n 20 ``` You may see additional messages like: - `"HFS-FS: unable to find HFS+ superblock"` - `"HFS-FS: volume is not cleanly unmounted"`
#### ✅ 4. Repair the Filesystem (If Possible) From a macOS system, run Disk Utility → First Aid on the drive. Or from Linux, if you have `hfsprogs`: ```bash sudo fsck.hfsplus /dev/sdXN # Note: This may not fix all issues; use with caution. ```
#### ✅ 5. Check for APFS Instead If this is a modern Mac drive (post-2017), it’s likely **APFS**, not HFS+. The `hfsplus` driver will fail on APFS volumes. → Use [apfs-linux](https://github.com/sgan81/apfs4linux) or mount via macOS in a VM if needed.
#### ✅ 6
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