Subject: compiler.h: Add read_word_at_a_time() function.

From: Andrey Ryabinin <[email-masked]>
Date: Thu, 1 Feb 2018 21:00:49 +0300

commit 7f1e541fc8d57a143dd5df1d0a1276046e08c083 upstream.

Sometimes we know that it's safe to do potentially out-of-bounds access
because we know it won't cross a page boundary.  Still, KASAN will
report this as a bug.

Add read_word_at_a_time() function which is supposed to be used in such
cases.  In read_word_at_a_time() KASAN performs relaxed check - only the
first byte of access is validated.

Signed-off-by: Andrey Ryabinin <[email-masked]>
Signed-off-by: Linus Torvalds <[email-masked]>
[bwh: Backported to 4.4: adjust context]
Signed-off-by: Ben Hutchings <[email-masked]>
---
 include/linux/compiler.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 92a51e00b904..7cabe0cc8665 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -292,6 +292,7 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
  * with an explicit memory barrier or atomic instruction that provides the
  * required ordering.
  */
+#include <linux/kasan-checks.h>
 
 #define __READ_ONCE(x, check)						\
 ({									\
@@ -310,6 +311,13 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
  */
 #define READ_ONCE_NOCHECK(x) __READ_ONCE(x, 0)
 
+static __no_kasan_or_inline
+unsigned long read_word_at_a_time(const void *addr)
+{
+	kasan_check_read(addr, 1);
+	return *(unsigned long *)addr;
+}
+
 #define WRITE_ONCE(x, val) \
 ({							\
 	union { typeof(x) __val; char __c[1]; } __u =	\