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mm: Introduce arch_validate_flags()

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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>
This commit is contained in:
Catalin Marinas
2019-11-25 17:27:06 +00:00
parent 9f3419315f
commit c462ac288f
3 changed files with 28 additions and 0 deletions
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6
mm/mprotect.c
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@@ -603,6 +603,12 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
goto out;
}
/* Allow architectures to sanity-check the new flags */
if (!arch_validate_flags(newflags)) {
error = -EINVAL;
goto out;
}
error = security_file_mprotect(vma, reqprot, prot);
if (error)
goto out;