Merge tag 'hardening-v6.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening fixes from Kees Cook:
 "Address a KUnit stack initialization regression that got tickled on
  m68k, and solve a Clang(v14 and earlier) bug found by 0day:

   - Fix stackinit KUnit regression on m68k

   - Use ARRAY_SIZE() for memtostr*()/strtomem*()"

* tag 'hardening-v6.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  string.h: Use ARRAY_SIZE() for memtostr*()/strtomem*()
  compiler.h: Introduce __must_be_byte_array()
  compiler.h: Move C string helpers into C-only kernel section
  stackinit: Fix comment for test_small_end
  stackinit: Keep selftest union size small on m68k

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/stackinit_kunit.c b/lib/stackinit_kunit.c
index fbe910c9c8253..135322592faf8 100644
--- a/lib/stackinit_kunit.c
+++ b/lib/stackinit_kunit.c
@@ -75,8 +75,10 @@ static bool stackinit_range_contains(char *haystack_start, size_t haystack_size,
  */
 #ifdef CONFIG_M68K
 #define FILL_SIZE_STRING		8
+#define FILL_SIZE_ARRAY			2
 #else
 #define FILL_SIZE_STRING		16
+#define FILL_SIZE_ARRAY			8
 #endif
 
 #define INIT_CLONE_SCALAR		/**/
@@ -345,11 +347,11 @@ union test_small_start {
 	short three;
 	unsigned long four;
 	struct big_struct {
-		unsigned long array[8];
+		unsigned long array[FILL_SIZE_ARRAY];
 	} big;
 };
 
-/* Mismatched sizes, with one and two being small */
+/* Mismatched sizes, with three and four being small */
 union test_small_end {
 	short one;
 	unsigned long two;