From a7616d6d23f99718b009012505fbd7f58dae53cf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Tue, 2 Oct 2018 12:53:39 +0300
Subject: [PATCH] Add helpful printouts in stacksmash.c

---
 test/stacksmash.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/test/stacksmash.c b/test/stacksmash.c
index 27fee0f..a5b4523 100644
--- a/test/stacksmash.c
+++ b/test/stacksmash.c
@@ -16,13 +16,23 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <stdio.h>
+
 __attribute__((noinline))
 void func(char *ptr) {
     ptr[10] = 0;
 }
+
 int main(int argc, char *argv[]) {
     char buf[10];
-    if (argc > 1)
+    if (argc > 1) {
+        fprintf(stderr, "smashing stack\n");
+        fflush(stderr);
         func(buf);
+    } else {
+        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]);
+    }
     return 0;
 }