add no splicing compile option and print used compile options in afl-fuzz help

GNUmakefile

@@ -36,6 +36,10 @@ SH_PROGS    = afl-plot afl-cmin afl-cmin.bash afl-whatsup afl-system-config
 MANPAGES=$(foreach p, $(PROGS) $(SH_PROGS), $(p).8) afl-as.8
 ASAN_OPTIONS=detect_leaks=0
 
+ifdef NO_SPLICING
+  override CFLAGS += -DNO_SPLICING
+endif
+
 ifdef ASAN_BUILD
   $(info Compiling ASAN version of binaries)
   override CFLAGS+=$(ASAN_CFLAGS)
@@ -344,7 +348,10 @@ help:
 	@echo ASAN_BUILD - compiles with memory sanitizer for debug purposes
 	@echo DEBUG - no optimization, -ggdb3, all warnings and -Werror
 	@echo PROFILING - compile afl-fuzz with profiling information
+	@echo NO_PYTHON - disable python support
+	@echo NO_SPLICING - disables splicing mutation in afl-fuzz, not recommended for normal fuzzing
 	@echo AFL_NO_X86 - if compiling on non-intel/amd platforms
+	@echo "LLVM_CONFIG - if your distro doesn't use the standard name for llvm-config (e.g. Debian)"
 	@echo "=========================================="
 	@echo e.g.: make ASAN_BUILD=1
 

README.md

@@ -212,6 +212,7 @@ These build options exist:
 * DEBUG - no optimization, -ggdb3, all warnings and -Werror
 * PROFILING - compile with profiling information (gprof)
 * NO_PYTHON - disable python support
+* NO_SPLICING - disables splicing mutation in afl-fuzz, not recommended for normal fuzzing
 * AFL_NO_X86 - if compiling on non-intel/amd platforms
 * LLVM_CONFIG - if your distro doesn't use the standard name for llvm-config (e.g. Debian)
 

docs/Changelog.md

@@ -34,6 +34,8 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
     - crashing seeds are now not prohibiting a run anymore but are
       skipped. They are used for splicing though.
     - set the default power schedule to the superiour "seek" schedule
+    - added NO_SPLICING compile option and makefile define
+    - print special compile time options used in help output
   - instrumentation
     - We received an enhanced gcc_plugin module from AdaCore, thank you
       very much!!

src/afl-fuzz-state.c

@@ -102,7 +102,9 @@ void afl_state_init(afl_state_t *afl, uint32_t map_size) {
   afl->stats_update_freq = 1;
   afl->stats_avg_exec = -1;
   afl->skip_deterministic = 1;
+#ifndef NO_SPLICING
   afl->use_splicing = 1;
+#endif
   afl->q_testcase_max_cache_size = TESTCASE_CACHE_SIZE * 1048576UL;
   afl->q_testcase_max_cache_entries = 64 * 1024;
 

src/afl-fuzz.c

@@ -224,6 +224,26 @@ static void usage(u8 *argv0, int more_help) {
   SAYF("Compiled without python module support\n");
 #endif
 
+#ifdef ASAN_BUILD
+  SAYF("Compiled with ASAN_BUILD\n\n");
+#endif
+
+#ifdef NO_SPLICING
+  SAYF("Compiled with NO_SPLICING\n\n");
+#endif
+
+#ifdef PROFILING
+  SAYF("Compiled with PROFILING\n\n");
+#endif
+
+#ifdef _DEBUG
+  SAYF("Compiled with _DEBUG\n\n");
+#endif
+
+#ifdef _AFL_DOCUMENT_MUTATIONS
+  SAYF("Compiled with _AFL_DOCUMENT_MUTATIONS\n\n");
+#endif
+
   SAYF("For additional help please consult %s/README.md\n\n", doc_path);
 
   exit(1);
@@ -1527,7 +1547,11 @@ int main(int argc, char **argv_orig, char **envp) {
 
         } else {
 
+  #ifndef NO_SPLICING
           afl->use_splicing = 1;
+  #else
+          afl->use_splicing = 0;
+  #endif
 
         }