env var to disable qemu caching

1 files changed, 6 insertions, 0 deletions

diff --git a/qemu_mode/patches/afl-qemu-cpu-inl.h b/qemu_mode/patches/afl-qemu-cpu-inl.h
index f4c474d8..7c6d3341 100644
--- a/qemu_mode/patches/afl-qemu-cpu-inl.h
+++ b/qemu_mode/patches/afl-qemu-cpu-inl.h
@@ -84,6 +84,8 @@ __thread abi_ulong afl_prev_loc;
 /* Set in the child process in forkserver mode: */
 
 static int    forkserver_installed = 0;
+static int    disable_caching = 0;
+
 unsigned char afl_fork_child;
 unsigned int  afl_forksrv_pid;
 unsigned char is_persistent;
@@ -205,6 +207,8 @@ static void afl_setup(void) {
      behaviour, and seems to work alright? */
 
   rcu_disable_atfork();
+  
+  disable_caching = getenv("AFL_QEMU_DISABLE_CACHE") != NULL;
 
   is_persistent = getenv("AFL_QEMU_PERSISTENT_ADDR") != NULL;
 
@@ -422,6 +426,8 @@ static void afl_request_tsl(target_ulong pc, target_ulong cb, uint32_t flags,
                             uint32_t cf_mask, TranslationBlock *last_tb,
                             int tb_exit) {
 
+  if (disable_caching) return;
+
   struct afl_tsl   t;
   struct afl_chain c;