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-rw-r--r--arch/arm64/mm/mmap.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c
index 7b0d55756eb1..adc208c2ae9c 100644
--- a/arch/arm64/mm/mmap.c
+++ b/arch/arm64/mm/mmap.c
@@ -18,6 +18,7 @@
#include <linux/elf.h>
#include <linux/fs.h>
+#include <linux/memblock.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/export.h>
@@ -103,12 +104,18 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
*/
int valid_phys_addr_range(phys_addr_t addr, size_t size)
{
- if (addr < PHYS_OFFSET)
- return 0;
- if (addr + size > __pa(high_memory - 1) + 1)
- return 0;
-
- return 1;
+ /*
+ * Check whether addr is covered by a memory region without the
+ * MEMBLOCK_NOMAP attribute, and whether that region covers the
+ * entire range. In theory, this could lead to false negatives
+ * if the range is covered by distinct but adjacent memory regions
+ * that only differ in other attributes. However, few of such
+ * attributes have been defined, and it is debatable whether it
+ * follows that /dev/mem read() calls should be able traverse
+ * such boundaries.
+ */
+ return memblock_is_region_memory(addr, size) &&
+ memblock_is_map_memory(addr);
}
/*