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/*
american fuzzy lop++ - custom mutators related routines
-------------------------------------------------------
Originally written by Shengtuo Hu
Now maintained by Marc Heuse <mh@mh-sec.de>,
Heiko Eißfeldt <heiko.eissfeldt@hexco.de> and
Andrea Fioraldi <andreafioraldi@gmail.com>
Copyright 2016, 2017 Google Inc. All rights reserved.
Copyright 2019-2020 AFLplusplus Project. 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
This is the real deal: the program takes an instrumented binary and
attempts a variety of basic fuzzing tricks, paying close attention to
how they affect the execution path.
*/
#include "afl-fuzz.h"
void setup_custom_mutator(void) {
u8* fn = getenv("AFL_CUSTOM_MUTATOR_LIBRARY");
if (fn) {
if (limit_time_sig)
FATAL(
"MOpt and custom mutator are mutually exclusive. We accept pull "
"requests that integrates MOpt with the optional mutators "
"(custom/radamsa/redquenn/...).");
load_custom_mutator(fn);
return;
}
#ifdef USE_PYTHON
if (init_py()) FATAL("Failed to initialize Python module");
// u8* module_name = getenv("AFL_PYTHON_MODULE");
// if (py_module && module_name)
// load_custom_mutator_py(module_name);
#else
if (getenv("AFL_PYTHON_MODULE"))
FATAL("Your AFL binary was built without Python support");
#endif
}
void destroy_custom_mutator(void) {
if (mutator) {
if (mutator->dh)
dlclose(mutator->dh);
else {
/* Python mutator */
#ifdef USE_PYTHON
finalize_py();
#endif
}
ck_free(mutator);
}
}
void load_custom_mutator(const char* fn) {
void* dh;
mutator = ck_alloc(sizeof(struct custom_mutator));
mutator->name = fn;
ACTF("Loading custom mutator library from '%s'...", fn);
dh = dlopen(fn, RTLD_NOW);
if (!mutator->dh) FATAL("%s", dlerror());
mutator->dh = dh;
/* Mutator */
/* "afl_custom_init", optional */
mutator->afl_custom_init = dlsym(dh, "afl_custom_init");
if (!mutator->afl_custom_init)
WARNF("Symbol 'afl_custom_init' not found.");
/* "afl_custom_fuzz" or "afl_custom_mutator", required */
mutator->afl_custom_fuzz = dlsym(dh, "afl_custom_fuzz");
if (!mutator->afl_custom_fuzz) {
/* Try "afl_custom_mutator" for backward compatibility */
WARNF("Symbol 'afl_custom_fuzz' not found. Try 'afl_custom_mutator'.");
mutator->afl_custom_fuzz = dlsym(dh, "afl_custom_mutator");
if (!mutator->afl_custom_fuzz) {
FATAL("Symbol 'afl_custom_mutator' not found.");
}
}
/* "afl_custom_pre_save", optional */
mutator->afl_custom_pre_save = dlsym(dh, "afl_custom_pre_save");
if (!mutator->afl_custom_pre_save)
WARNF("Symbol 'afl_custom_pre_save' not found.");
/* "afl_custom_init_trim", optional */
mutator->afl_custom_init_trim = dlsym(dh, "afl_custom_init_trim");
if (!mutator->afl_custom_init_trim)
WARNF("Symbol 'afl_custom_init_trim' not found.");
/* "afl_custom_trim", optional */
mutator->afl_custom_trim = dlsym(dh, "afl_custom_trim");
if (!mutator->afl_custom_trim)
WARNF("Symbol 'afl_custom_trim' not found.");
/* "afl_custom_post_trim", optional */
mutator->afl_custom_post_trim = dlsym(dh, "afl_custom_post_trim");
if (!mutator->afl_custom_post_trim)
WARNF("Symbol 'afl_custom_post_trim' not found.");
OKF("Custom mutator '%s' installed successfully.", fn);
/* Initialize the custom mutator */
if (mutator->afl_custom_init)
mutator->afl_custom_init();
}
// void load_custom_mutator_py(const char* module_name) {
// mutator = ck_alloc(sizeof(struct custom_mutator));
// mutator->name = module_name;
// ACTF("Loading Python mutator library from '%s'...", module_name);
// /* Initialize of the Python mutator has been invoked in "init_py()" */
// mutator->afl_custom_init = NULL;
// mutator->afl_custom_fuzz = fuzz_py;
// mutator->afl_custom_pre_save = pre_save_py;
// mutator->afl_custom_init_trim = init_trim_py;
// mutator->afl_custom_trim = trim_py;
// mutator->afl_custom_post_trim = post_trim_py;
// OKF("Python mutator '%s' installed successfully.", module_name);
// }
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