From 52c221fc484317d2cd3926ae31ac891bad8cc93a Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Wed, 6 Jan 2021 09:35:47 +0100
Subject: selective coverage fix

---
 instrumentation/afl-compiler-rt.o.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

(limited to 'instrumentation/afl-compiler-rt.o.c')

diff --git a/instrumentation/afl-compiler-rt.o.c b/instrumentation/afl-compiler-rt.o.c
index bb62fb38..add303d7 100644
--- a/instrumentation/afl-compiler-rt.o.c
+++ b/instrumentation/afl-compiler-rt.o.c
@@ -1435,19 +1435,15 @@ void __afl_coverage_abort() {
 }
 
 // mark this area as especially interesting
-void __afl_coverage_interesting(u32 id, u8 val) {
+void __afl_coverage_interesting(u8 val, u32 id) {
 
-  if (val) {
+  if (id) {
 
     __afl_area_ptr[id] = val;
 
   } else {
 
-    do {
-
-      __afl_area_ptr[id] = (u8)rand();
-
-    } while (!__afl_area_ptr[id]);
+    __afl_area_ptr[(rand() % __afl_map_size)] = val;
 
   }
 
-- 
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