lkdtm/bugs: XFAIL UNALIGNED_LOAD_STORE_WRITE

When built under CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS, this test is
expected to fail (i.e. not trip an exception).

Fixes: 46d1a0f0 ("selftests/lkdtm: Add tests for LKDTM targets")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210623203936.3151093-5-keescook@chromium.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/lkdtm/bugs.c

@@ -161,6 +161,9 @@ void lkdtm_UNALIGNED_LOAD_STORE_WRITE(void)
 	if (*p == 0)
 		val = 0x87654321;
 	*p = val;
+
+	if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS))
+		pr_err("XFAIL: arch has CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS\n");
 }
 
 void lkdtm_SOFTLOCKUP(void)