From a9183883b88bfccd1c6a62e27621b2c892d50b67 Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Mon, 20 Sep 2010 06:00:22 -0400
Subject: map kernel instructions r/o

---
 usertests.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'usertests.c')

diff --git a/usertests.c b/usertests.c
index e62703d..177ffba 100644
--- a/usertests.c
+++ b/usertests.c
@@ -1419,6 +1419,7 @@ validatetest(void)
   printf(stdout, "validate ok\n");
 }
 
+// does unintialized data start out zero?
 char uninit[10000];
 void
 bsstest(void)
@@ -1434,6 +1435,32 @@ bsstest(void)
   printf(stdout, "bss test ok\n");
 }
 
+// does exec do something sensible if the arguments
+// are larger than a page?
+void
+bigargtest(void)
+{
+  int pid, ppid;
+
+  ppid = getpid();
+  pid = fork();
+  if(pid == 0){
+    char *args[100];
+    int i;
+    for(i = 0; i < 99; i++)
+      args[i] = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
+    args[99] = 0;
+    printf(stdout, "bigarg test\n");
+    exec("echo", args);
+    printf(stdout, "bigarg test ok\n");
+    exit();
+  } else if(pid < 0){
+    printf(stdout, "bigargtest: fork failed\n");
+    exit();
+  }
+  wait();
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -1445,6 +1472,7 @@ main(int argc, char *argv[])
   }
   close(open("usertests.ran", O_CREATE));
 
+  // bigargtest();
   bsstest();
   sbrktest();
   validatetest();
-- 
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