kill targets on exit

docs/Changelog.md

@@ -19,6 +19,7 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
      - switched murmur2 hashing and random() for xxh3 and xoshiro256**,
        resulting in an up to 5.5% speed increase
      - Resizing the window does not crash afl-fuzz anymore
+     - Ensure that the targets are killed on exit
      - fix/update to MOpt (thanks to arnow117)
      - added MOpt dictionary support from repo
   - llvm_mode:

src/afl-forkserver.c

@@ -466,6 +466,13 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
 
   /* PARENT PROCESS */
 
+  char pid_buf[16];
+  sprintf(pid_buf, "%d", fsrv->fsrv_pid);
+  if (fsrv->cmplog_binary)
+    setenv("__AFL_TARGET_PID2", pid_buf, 1);
+  else
+    setenv("__AFL_TARGET_PID1", pid_buf, 1);
+
   /* Close the unneeded endpoints. */
 
   close(ctl_pipe[0]);

src/afl-fuzz.c

@@ -31,6 +31,23 @@
 extern u64 time_spent_working;
 #endif
 
+static void at_exit() {
+
+  int i;
+  char *ptr = getenv("__AFL_TARGET_PID1");
+
+  if (ptr && *ptr && (i = atoi(ptr)) > 0)
+    kill(i, SIGKILL);
+
+  ptr = getenv("__AFL_TARGET_PID2");
+
+  if (ptr && *ptr && (i = atoi(ptr)) > 0)
+    kill(i, SIGKILL);
+
+  // anything else? shared memory?
+
+}
+
 static u8 *get_libradamsa_path(u8 *own_loc) {
 
   u8 *tmp, *cp, *rsl, *own_copy;
@@ -1242,6 +1259,8 @@ int main(int argc, char **argv_orig, char **envp) {
     OKF("Cmplog forkserver successfully started");
 
   }
+  
+  atexit(at_exit);
 
   perform_dry_run(afl);