a3

4/level3/level3.c

@@ -0,0 +1,24 @@
+// gcc -o level3 -no-pie -fno-stack-protector level3.c
+#include <stdio.h>
+#include <unistd.h>
+
+const char command[] = "/bin/sh";
+
+void win(char *cmd) {
+  char *argv[2];
+  argv[0] = cmd;
+  argv[1] = NULL;
+  execve(cmd, argv, NULL);
+}
+
+int main(int argc, char **argv) {
+  // Disable output buffering. Not part of the challenge.
+  setvbuf(stdout, NULL, _IONBF, 0);
+  setvbuf(stdin, NULL, _IONBF, 0);
+
+  char buffer[32];
+  puts("What do you want to talk about?");
+  fgets(buffer, 320, stdin);
+  puts("Bye.");
+  return 0;
+}