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-rw-r--r--arch/arm64/mm/mmap.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c
index a38f54cd638c..77ada00280d9 100644
--- a/arch/arm64/mm/mmap.c
+++ b/arch/arm64/mm/mmap.c
@@ -7,8 +7,10 @@
#include <linux/io.h>
#include <linux/memblock.h>
+#include <linux/mm.h>
#include <linux/types.h>
+#include <asm/cpufeature.h>
#include <asm/page.h>
/*
@@ -38,3 +40,18 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
{
return !(((pfn << PAGE_SHIFT) + size) & ~PHYS_MASK);
}
+
+static int __init adjust_protection_map(void)
+{
+ /*
+ * With Enhanced PAN we can honour the execute-only permissions as
+ * there is no PAN override with such mappings.
+ */
+ if (cpus_have_const_cap(ARM64_HAS_EPAN)) {
+ protection_map[VM_EXEC] = PAGE_EXECONLY;
+ protection_map[VM_EXEC | VM_SHARED] = PAGE_EXECONLY;
+ }
+
+ return 0;
+}
+arch_initcall(adjust_protection_map);