solved 6

4/level6/level6.c

@@ -0,0 +1,27 @@
+// gcc -o level6 -no-pie -fstack-protector level6.c
+#include <stdio.h>
+#include <unistd.h>
+
+void win(void) {
+  char *argv[2];
+  argv[0] = "/bin/sh";
+  argv[1] = NULL;
+  execve(argv[0], 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[64];
+  while (1) {
+    puts("What do you want to talk about?");
+    read(0, buffer, 128);
+    if (buffer[0] == '\0' || buffer[0] == '\n') break;
+
+    printf("I can't talk about %s.\n", buffer);
+  }
+  puts("Bye.");
+  return 0;
+}