Catalin Marinas c462ac288f
mm: Introduce arch_validate_flags() ...
Similarly to arch_validate_prot() called from do_mprotect_pkey(), an
architecture may need to sanity-check the new vm_flags.
Define a dummy function always returning true. In addition to
do_mprotect_pkey(), also invoke it from mmap_region() prior to updating
vma->vm_page_prot to allow the architecture code to veto potentially
inconsistent vm_flags.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com >
Acked-by: Andrew Morton <akpm@linux-foundation.org >
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