From 03b99b51445fe81b711acf3dc21e38e823476120 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Sun, 7 Oct 2018 21:00:30 +0300
Subject: [PATCH] Do one in-bounds write in clean runs of stacksmash.c

---
 test/stacksmash.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/test/stacksmash.c b/test/stacksmash.c
index a5b4523..019b1c3 100644
--- a/test/stacksmash.c
+++ b/test/stacksmash.c
@@ -19,8 +19,8 @@
 #include <stdio.h>
 
 __attribute__((noinline))
-void func(char *ptr) {
-    ptr[10] = 0;
+void func(char *ptr, int idx) {
+    ptr[idx] = 0;
 }
 
 int main(int argc, char *argv[]) {
@@ -28,8 +28,9 @@ int main(int argc, char *argv[]) {
     if (argc > 1) {
         fprintf(stderr, "smashing stack\n");
         fflush(stderr);
-        func(buf);
+        func(buf, 10);
     } else {
+        func(buf, 9);
         fprintf(stderr, "%s: A test tool for detecting stack smashing.\n"
                         "Run this with a command line argument to trigger an "
                         "error.\n", argv[0]);