fsdax: dax_unshare_iter needs to copy entire blocks

CVE-2024-50250

What is CVE-2024-50250?

A vulnerability in the Linux kernel arises from improperly aligned memory operations during file sharing processes in the fsdax file system. The dax_unshare_iter function fails to ensure that data copy operations align with file system block boundaries, leading to potential data corruption and exposure of stale persistent memory contents. This misalignment results in incorrect byte copying, which directly impacts data integrity during file access. Additionally, the lack of an appropriate mechanism to invalidate the inode pages permits outdated memory mappings to persist post-metadata updates, heightening the risk of unauthorized data access. Addressing these issues requires realigning copy operations to ensure full blocks are processed correctly.

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