fix afl_preload issues on macos

docs/Changelog.md

@@ -17,6 +17,7 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
     configuration settings for fuzzing, for Linux and Macos.
     thanks to jhertz!
   - added xml, curl and exotic string functions to llvm dictionary features
+  - fix AFL_PRELOAD issues on MacOS
   - removed utils/afl_frida because frida_mode/ is now so much better
 
 

docs/INSTALL.md

@@ -74,7 +74,7 @@ and depend mostly on user feedback.
 To build AFL, install llvm (and perhaps gcc) from brew and follow the general
 instructions for Linux. If possible avoid Xcode at all cost.
 
-`brew install wget git make cmake llvm`
+`brew install wget git make cmake llvm gdb`
 
 Be sure to setup PATH to point to the correct clang binaries and use the
 freshly installed clang, clang++ and gmake, e.g.:

src/afl-fuzz.c

@@ -1398,6 +1398,9 @@ int main(int argc, char **argv_orig, char **envp) {
 
   afl->fsrv.use_fauxsrv = afl->non_instrumented_mode == 1 || afl->no_forkserver;
 
+  check_crash_handling();
+  check_cpu_governor(afl);
+
   if (getenv("LD_PRELOAD")) {
 
     WARNF(
@@ -1498,8 +1501,6 @@ int main(int argc, char **argv_orig, char **envp) {
 
   }
 
-  check_crash_handling();
-  check_cpu_governor(afl);
 
   get_core_count(afl);