mm: use aligned address in clear_gigantic_page()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: mm: use aligned address in clear_gigantic_page() In current kernel, hugetlb_no_page() calls folio_zero_user() with the fault address. Where the fault address may be not aligned with the huge page size. Then, folio_zero_user() may call clear_gigantic_page() with the address, while clear_gigantic_page() requires the address to be huge page size aligned. So, this may cause memory corruption or information leak, addtional, use more obvious naming 'addr_hint' instead of 'addr' for clear_gigantic_page().

References

• https://git.kernel.org/stable/c/b79b6fe0737f233f0be1465052b7f0e75f324735
• https://git.kernel.org/stable/c/8aca2bc96c833ba695ede7a45ad7784c836a262e