persistent replay env setup

include/afl-fuzz.h

@@ -390,7 +390,7 @@ typedef struct afl_env_vars {
       *afl_hang_tmout, *afl_forksrv_init_tmout, *afl_skip_crashes, *afl_preload,
       *afl_max_det_extras, *afl_statsd_host, *afl_statsd_port,
       *afl_crash_exitcode, *afl_statsd_tags_flavor, *afl_testcache_size,
-      *afl_testcache_entries, *afl_kill_signal;
+      *afl_testcache_entries, *afl_kill_signal, *afl_persistent_replay;
 
 } afl_env_vars_t;
 

include/envs.h

@@ -123,6 +123,7 @@ static char *afl_environment_variables[] = {
     "AFL_MAX_DET_EXTRAS",
     "AFL_PATH",
     "AFL_PERFORMANCE_FILE",
+    "AFL_PERSISTEN_REPLAY",
     "AFL_PRELOAD",
     "AFL_PYTHON_MODULE",
     "AFL_QEMU_COMPCOV",

include/forkserver.h

@@ -55,6 +55,9 @@ typedef struct afl_forkserver {
   u32 init_tmout;                       /* Configurable init timeout (ms)   */
   u32 map_size;                         /* map size used by the target      */
   u32 snapshot;                         /* is snapshot feature used         */
+  u32 persistent_replay;                /* persistent replay setting        */
+  u32 persistent_replay_idx;            /* persistent replay cache ptr      */
+  u32 persistent_replay_cnt;            /* persistent replay counter        */
   u64 mem_limit;                        /* Memory cap for child (MB)        */
 
   u64 total_execs;                      /* How often run_target was called  */

src/afl-forkserver.c

@@ -126,7 +126,7 @@ void afl_fsrv_init_dup(afl_forkserver_t *fsrv_to, afl_forkserver_t *from) {
   fsrv_to->last_run_timed_out = 0;
 
   fsrv_to->init_child_func = from->init_child_func;
-  // Note: do not copy ->add_extra_func
+  // Note: do not copy ->add_extra_func or ->persistent_replay*
 
   list_append(&fsrv_list, fsrv_to);
 

src/afl-fuzz-state.c

@@ -292,6 +292,13 @@ void read_afl_environment(afl_state_t *afl, char **envp) {
             afl->afl_env.afl_autoresume =
                 get_afl_env(afl_environment_variables[i]) ? 1 : 0;
 
+          } else if (!strncmp(env, "AFL_PERSISTENT_REPLAY",
+
+                              afl_environment_variable_len)) {
+
+            afl->afl_env.afl_persistent_replay =
+                get_afl_env(afl_environment_variables[i]);
+
           } else if (!strncmp(env, "AFL_CYCLE_SCHEDULES",
 
                               afl_environment_variable_len)) {

src/afl-fuzz.c

@@ -1239,6 +1239,12 @@ int main(int argc, char **argv_orig, char **envp) {
 
   }
 
+  if (afl->afl_env.afl_persistent_replay) {
+
+    afl->fsrv.persistent_replay = atoi(afl->afl_env.afl_persistent_replay);
+
+  }
+
   if (afl->afl_env.afl_crash_exitcode) {
 
     long exitcode = strtol(afl->afl_env.afl_crash_exitcode, NULL, 10);