kernel: ext4: dax: fix overflowing extents beyond inode size when partially writing

An inode corruption flaw was found in the Linux kernel's Ext4 file system functionality related to how a user can interrupt a write using the daxiomaprwfunction. This flaw allows a local user to make non-fatal mistakes with Ext4, leading to a file system denial of service...

CVE-2024-50015

CVE-2024-50015 affects the Linux kernel ext4 dax path. In ext4/dax, the loop in dax_iomap_rw() can copy data after the process is signalled and then update the inode size, causing written extents to exceed the inode size (e.g., 2M vs 4M) and fsck to report inconsistencies. The referenced fixes tr...