CVE-2024-50022 device-dax: correct pgoff align in dax_set_mapping()

In the Linux kernel, the following vulnerability has been resolved: device-dax: correct pgoff align in daxsetmapping pgoff should be aligned using ALIGNDOWN instead of ALIGN. Otherwise, vmf-address not aligned to faultsize will be aligned to the next alignment, that can result in memory failure...

CVE-2024-50022

The CVE-2024-50022 issue affects the Linux kernel device-dax path. The root cause is pgoff alignment in dax_set_mapping() using ALIGN() instead of ALIGN_DOWN(), which can misalign vmf->address to fault_size and cause memory address errors. This was observed during page fault handling in dev_da...