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authorCatalin Marinas <catalin.marinas@arm.com>2019-11-25 17:27:06 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2020-09-04 12:46:07 +0100
commitc462ac288f2c97e0c1d9ff6a65955317e799f958 (patch)
treeac7e3391d1688a5520c0f182fc60dd038b8033b6 /mm/mprotect.c
parent9f3419315f3cdc41a7318e4d50ba18a592b30c8c (diff)
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>
Diffstat (limited to 'mm/mprotect.c')
-rw-r--r--mm/mprotect.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index ce8b8a5eacbb..56c02beb6041 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -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;