fastexit + code format

GNUmakefile

@@ -592,6 +592,7 @@ clean:
 	-$(MAKE) -C utils/argv_fuzzing clean
 	-$(MAKE) -C utils/plot_ui clean
 	-$(MAKE) -C qemu_mode/unsigaction clean
+	-$(MAKE) -C qemu_mode/fastexit clean
 	-$(MAKE) -C qemu_mode/libcompcov clean
 	-$(MAKE) -C qemu_mode/libqasan clean
 	-$(MAKE) -C frida_mode clean

docs/Changelog.md

@@ -8,11 +8,14 @@
   - fix gramatron and grammar_mutator build scripts
   - enhancements to the afl-persistent-config and afl-system-config
     scripts
+  - afl-fuzz:
+    - force writing all stats on exit
   - afl-cc:
     - make gcc_mode (afl-gcc-fast) work with gcc down to version 3.6
   - qemu_mode:
     - fixed 10x speed degredation in v4.03c, thanks to @ele7enxxh for
       reporting!
+    - added qemu_mode/fastexit helper library
   - unicorn_mode:
     - Enabled tricore arch (by @jma-qb)
     - Updated Capstone version in Rust bindings

instrumentation/afl-gcc-common.h

@@ -505,3 +505,4 @@ struct afl_base_pass : gimple_opt_pass {
 #else
   #define gimple gimple
 #endif
+

qemu_mode/fastexit/Makefile

@@ -0,0 +1,30 @@
+#
+# american fuzzy lop++ - fastexit
+# --------------------------------
+#
+# Written by Andrea Fioraldi <andreafioraldi@gmail.com>
+#
+# Copyright 2019-2022 Andrea Fioraldi. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+
+TARGETS=fastexit.so fastexit32.so fastexit64.so
+
+all:  $(TARGETS)
+
+fastexit.so: fastexit.c
+	@if $(CC) -fPIC -shared fastexit.c -o fastexit.so 2>/dev/null ; then echo "fastexit build success"; else echo "fastexit build failure (that's fine)"; fi
+
+fastexit32.so: fastexit.c
+	@if $(CC) -fPIC -m32 -shared fastexit.c -o fastexit32.so 2>/dev/null ; then echo "fastexit32 build success"; else echo "fastexit32 build failure (that's fine)"; fi
+
+fastexit64.so: fastexit.c
+	@if $(CC) -fPIC -m64 -shared fastexit.c -o fastexit64.so 2>/dev/null ; then echo "fastexit64 build success"; else echo "fastexit64 build failure (that's fine)"; fi
+
+clean:
+	rm -f fastexit.so

qemu_mode/fastexit/README.md

@@ -0,0 +1,5 @@
+# fastexit
+
+This library forces _exit on exit when preloaded to gain speed.
+
+Gives speed on complex tarets like Android or Wine.

qemu_mode/fastexit/fastexit.c

@@ -0,0 +1,6 @@
+#include <unistd.h>
+#include <stdlib.h>
+
+void exit(int status) {
+  _exit(status);
+}

src/afl-fuzz.c

@@ -2570,6 +2570,7 @@ int main(int argc, char **argv_orig, char **envp) {
 stop_fuzzing:
 
   afl->force_ui_update = 1;  // ensure the screen is reprinted
+  afl->stop_soon = 1;        // ensure everything is written
   show_stats(afl);           // print the screen one last time
   write_bitmap(afl);
   save_auto(afl);