CVE-2024-56548

Summary

CVE-2024-56548 is a vulnerability in the Linux kernel's hfsplus file system that arises from not properly handling device logical block size queries. Devices' block sizes may change, and one such case is a loop device using ioctl LOOP_SET_BLOCK_SIZE. This can lead to out-of-bounds writing when hfsplus_read_wrapper calls hfsplus_submit_bio and the latter function reads a different io_size. The fix involves initializing a new min_io_size with the sb_min_blocksize and using the maximum between HFSPLUS_SECTOR_SIZE and min_io_size. The vulnerability was discovered during testing with loop block sizes of 512, 1024, and 4096 bytes and resulted in a kernel address validation error, as evidenced by the KASAN report provided.

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