added honggfuzz custom mutator :)

12 files changed, 1830 insertions, 0 deletions

diff --git a/custom_mutators/honggfuzz/Makefile b/custom_mutators/honggfuzz/Makefile
new file mode 100644
index 00000000..2f46d0e7
--- /dev/null
+++ b/custom_mutators/honggfuzz/Makefile
@@ -0,0 +1,15 @@
+
+CFLAGS = -O3 -funroll-loops -fPIC -Wl,-Bsymbolic
+
+all: honggfuzz.so
+
+honggfuzz.so:	honggfuzz.c input.h mangle.c ../../src/afl-performance.c
+	$(CC) $(CFLAGS) -I../../include -I. -shared -o honggfuzz.so honggfuzz.c mangle.c ../../src/afl-performance.c
+
+update:
+	wget --unlink https://github.com/google/honggfuzz/raw/master/mangle.c
+	wget --unlink https://github.com/google/honggfuzz/raw/master/mangle.h
+	wget --unlink https://github.com/google/honggfuzz/raw/master/honggfuzz.h
+
+clean:
+	rm -f *.o *~ *.so core
diff --git a/custom_mutators/honggfuzz/README.md b/custom_mutators/honggfuzz/README.md
new file mode 100644
index 00000000..8824976f
--- /dev/null
+++ b/custom_mutators/honggfuzz/README.md
@@ -0,0 +1,12 @@
+# custum mutator: honggfuzz mangle
+
+this is the very good honggfuzz mutator in mangle.c as a custom mutator
+module for afl++. It is the original mangle.c, mangle.h and honggfuzz.h
+with a lot of mocking around it :-)
+
+just type `make` to build
+
+```AFL_CUSTOM_MUTATOR_LIBRARY=custom_mutators/honggfuzz/honggfuzz.so afl-fuzz ...```
+
+> Original repository: https://github.com/google/honggfuzz
+> Source commit: d0fbcb0373c32436b8fb922e6937da93b17291f5
diff --git a/custom_mutators/honggfuzz/common.h b/custom_mutators/honggfuzz/common.h
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/custom_mutators/honggfuzz/common.h
diff --git a/custom_mutators/honggfuzz/custom_mutator_helpers.h b/custom_mutators/honggfuzz/custom_mutator_helpers.h
new file mode 100644
index 00000000..57754697
--- /dev/null
+++ b/custom_mutators/honggfuzz/custom_mutator_helpers.h
@@ -0,0 +1,22 @@
+#ifndef CUSTOM_MUTATOR_HELPERS
+#define CUSTOM_MUTATOR_HELPERS
+
+#include "config.h"
+#include "types.h"
+#include "afl-fuzz.h"
+#include <stdlib.h>
+
+#define INITIAL_GROWTH_SIZE (64)
+
+/* Use in a struct: creates a name_buf and a name_size variable. */
+#define BUF_VAR(type, name) \
+  type * name##_buf;        \
+  size_t name##_size;
+/* this filles in `&structptr->something_buf, &structptr->something_size`. */
+#define BUF_PARAMS(struct, name) \
+  (void **)&struct->name##_buf, &struct->name##_size
+
+#undef INITIAL_GROWTH_SIZE
+
+#endif
+
diff --git a/custom_mutators/honggfuzz/honggfuzz.c b/custom_mutators/honggfuzz/honggfuzz.c
new file mode 100644
index 00000000..368741c1
--- /dev/null
+++ b/custom_mutators/honggfuzz/honggfuzz.c
@@ -0,0 +1,141 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "custom_mutator_helpers.h"
+#include "mangle.h"
+
+#define NUMBER_OF_MUTATIONS 5
+
+uint8_t *         queue_input;
+size_t            queue_input_size;
+afl_state_t *     afl_struct;
+run_t             run;
+honggfuzz_t       global;
+struct _dynfile_t dynfile;
+
+typedef struct my_mutator {
+
+  afl_state_t *afl;
+  run_t *      run;
+  u8 *         mutator_buf;
+  unsigned int seed;
+  unsigned int extras_cnt, a_extras_cnt;
+
+} my_mutator_t;
+
+my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
+
+  my_mutator_t *data = calloc(1, sizeof(my_mutator_t));
+  if (!data) {
+
+    perror("afl_custom_init alloc");
+    return NULL;
+
+  }
+
+  if ((data->mutator_buf = malloc(MAX_FILE)) == NULL) {
+
+    perror("mutator_buf alloc");
+    return NULL;
+
+  }
+
+  run.dynfile = &dynfile;
+  run.global = &global;
+  data->afl = afl;
+  data->seed = seed;
+  data->run = &run;
+  afl_struct = afl;
+
+  run.global->mutate.maxInputSz = MAX_FILE;
+  run.global->mutate.mutationsPerRun = NUMBER_OF_MUTATIONS;
+  run.mutationsPerRun = NUMBER_OF_MUTATIONS;
+  run.global->timing.lastCovUpdate = 6;
+
+  // global->feedback.cmpFeedback
+  // global->feedback.cmpFeedbackMap
+
+  return data;
+
+}
+
+/* When a new queue entry is added we check if there are new dictionary
+   entries to add to honggfuzz structure */
+
+void afl_custom_queue_new_entry(my_mutator_t * data,
+                                const uint8_t *filename_new_queue,
+                                const uint8_t *filename_orig_queue) {
+
+  while (data->extras_cnt < data->afl->extras_cnt &&
+         run.global->mutate.dictionaryCnt < 1024) {
+
+    memcpy(run.global->mutate.dictionary[run.global->mutate.dictionaryCnt].val,
+           data->afl->extras[data->extras_cnt].data,
+           data->afl->extras[data->extras_cnt].len);
+    run.global->mutate.dictionary[run.global->mutate.dictionaryCnt].len =
+        data->afl->extras[data->extras_cnt].len;
+    run.global->mutate.dictionaryCnt++;
+    data->extras_cnt++;
+
+  }
+
+  while (data->extras_cnt < data->afl->a_extras_cnt &&
+         run.global->mutate.dictionaryCnt < 1024) {
+
+    memcpy(run.global->mutate.dictionary[run.global->mutate.dictionaryCnt].val,
+           data->afl->a_extras[data->a_extras_cnt].data,
+           data->afl->a_extras[data->a_extras_cnt].len);
+    run.global->mutate.dictionary[run.global->mutate.dictionaryCnt].len =
+        data->afl->a_extras[data->a_extras_cnt].len;
+    run.global->mutate.dictionaryCnt++;
+    data->a_extras_cnt++;
+
+  }
+
+}
+
+/* we could set only_printable if is_ascii is set ... let's see
+uint8_t afl_custom_queue_get(void *data, const uint8_t *filename) {
+
+  //run.global->cfg.only_printable = ...
+
+}
+
+*/
+
+/* here we run the honggfuzz mutator, which is really good */
+
+size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
+                       u8 **out_buf, uint8_t *add_buf, size_t add_buf_size,
+                       size_t max_size) {
+
+  /* set everything up, costly ... :( */
+  memcpy(data->mutator_buf, buf, buf_size);
+  queue_input = data->mutator_buf;
+  run.dynfile->data = data->mutator_buf;
+  queue_input_size = buf_size;
+  run.dynfile->size = buf_size;
+  *out_buf = data->mutator_buf;
+
+  /* the mutation */
+  mangle_mangleContent(&run, NUMBER_OF_MUTATIONS);
+
+  /* return size of mutated data */
+  return run.dynfile->size;
+
+}
+
+/**
+ * Deinitialize everything
+ *
+ * @param data The data ptr from afl_custom_init
+ */
+void afl_custom_deinit(my_mutator_t *data) {
+
+  free(data->mutator_buf);
+  free(data);
+
+}
+
diff --git a/custom_mutators/honggfuzz/honggfuzz.h b/custom_mutators/honggfuzz/honggfuzz.h
new file mode 100644
index 00000000..4e045272
--- /dev/null
+++ b/custom_mutators/honggfuzz/honggfuzz.h
@@ -0,0 +1,460 @@
+/*
+ *
+ * honggfuzz - core structures and macros
+ * -----------------------------------------
+ *
+ * Author: Robert Swiecki <swiecki@google.com>
+ *
+ * Copyright 2010-2018 by Google Inc. 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
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ *
+ */
+
+#ifndef _HF_HONGGFUZZ_H_
+#define _HF_HONGGFUZZ_H_
+
+#include <dirent.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <sys/param.h>
+#include <sys/queue.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include "libhfcommon/util.h"
+
+#define PROG_NAME "honggfuzz"
+#define PROG_VERSION "2.2"
+
+/* Name of the template which will be replaced with the proper name of the file
+ */
+#define _HF_FILE_PLACEHOLDER "___FILE___"
+
+/* Default name of the report created with some architectures */
+#define _HF_REPORT_FILE "HONGGFUZZ.REPORT.TXT"
+
+/* Default stack-size of created threads. */
+#define _HF_PTHREAD_STACKSIZE (1024ULL * 1024ULL * 2ULL)             /* 2MB */
+
+/* Name of envvar which indicates sequential number of fuzzer */
+#define _HF_THREAD_NO_ENV "HFUZZ_THREAD_NO"
+
+/* Name of envvar which indicates that the netDriver should be used */
+#define _HF_THREAD_NETDRIVER_ENV "HFUZZ_USE_NETDRIVER"
+
+/* Name of envvar which indicates honggfuzz's log level in use */
+#define _HF_LOG_LEVEL_ENV "HFUZZ_LOG_LEVEL"
+
+/* Number of crash verifier iterations before tag crash as stable */
+#define _HF_VERIFIER_ITER 5
+
+/* Size (in bytes) for report data to be stored in stack before written to file
+ */
+#define _HF_REPORT_SIZE 32768
+
+/* Perf bitmap size */
+#define _HF_PERF_BITMAP_SIZE_16M (1024U * 1024U * 16U)
+#define _HF_PERF_BITMAP_BITSZ_MASK 0x7FFFFFFULL
+/* Maximum number of PC guards (=trace-pc-guard) we support */
+#define _HF_PC_GUARD_MAX (1024ULL * 1024ULL * 64ULL)
+
+/* Maximum size of the input file in bytes (1 MiB) */
+#define _HF_INPUT_MAX_SIZE (1024ULL * 1024ULL)
+
+/* Default maximum size of produced inputs */
+#define _HF_INPUT_DEFAULT_SIZE (1024ULL * 8)
+
+/* Per-thread bitmap */
+#define _HF_PERTHREAD_BITMAP_FD 1018
+/* FD used to report back used int/str constants from the fuzzed process */
+#define _HF_CMP_BITMAP_FD 1019
+/* FD used to log inside the child process */
+#define _HF_LOG_FD 1020
+/* FD used to represent the input file */
+#define _HF_INPUT_FD 1021
+/* FD used to pass coverage feedback from the fuzzed process */
+#define _HF_COV_BITMAP_FD 1022
+#define _HF_BITMAP_FD _HF_COV_BITMAP_FD   /* Old name for _HF_COV_BITMAP_FD */
+/* FD used to pass data to a persistent process */
+#define _HF_PERSISTENT_FD 1023
+
+/* Input file as a string */
+#define _HF_INPUT_FILE_PATH "/dev/fd/" HF_XSTR(_HF_INPUT_FD)
+
+/* Maximum number of supported execve() args */
+#define _HF_ARGS_MAX 2048
+
+/* Message indicating that the fuzzed process is ready for new data */
+static const uint8_t HFReadyTag = 'R';
+
+/* Maximum number of active fuzzing threads */
+#define _HF_THREAD_MAX 1024U
+
+/* Persistent-binary signature - if found within file, it means it's a
+ * persistent mode binary */
+#define _HF_PERSISTENT_SIG "\x01_LIBHFUZZ_PERSISTENT_BINARY_SIGNATURE_\x02\xFF"
+/* HF NetDriver signature - if found within file, it means it's a
+ * NetDriver-based binary */
+#define _HF_NETDRIVER_SIG "\x01_LIBHFUZZ_NETDRIVER_BINARY_SIGNATURE_\x02\xFF"
+
+/* printf() nonmonetary separator. According to MacOSX's man it's supported
+ * there as well */
+#define _HF_NONMON_SEP "'"
+
+typedef enum {
+
+  _HF_DYNFILE_NONE = 0x0,
+  _HF_DYNFILE_INSTR_COUNT = 0x1,
+  _HF_DYNFILE_BRANCH_COUNT = 0x2,
+  _HF_DYNFILE_BTS_EDGE = 0x10,
+  _HF_DYNFILE_IPT_BLOCK = 0x20,
+  _HF_DYNFILE_SOFT = 0x40,
+
+} dynFileMethod_t;
+
+typedef struct {
+
+  uint64_t cpuInstrCnt;
+  uint64_t cpuBranchCnt;
+  uint64_t bbCnt;
+  uint64_t newBBCnt;
+  uint64_t softCntPc;
+  uint64_t softCntEdge;
+  uint64_t softCntCmp;
+
+} hwcnt_t;
+
+typedef enum {
+
+  _HF_STATE_UNSET = 0,
+  _HF_STATE_STATIC,
+  _HF_STATE_DYNAMIC_DRY_RUN,
+  _HF_STATE_DYNAMIC_MAIN,
+  _HF_STATE_DYNAMIC_MINIMIZE,
+
+} fuzzState_t;
+
+typedef enum {
+
+  HF_MAYBE = -1,
+  HF_NO = 0,
+  HF_YES = 1,
+
+} tristate_t;
+
+struct _dynfile_t {
+
+  size_t             size;
+  uint64_t           cov[4];
+  size_t             idx;
+  int                fd;
+  uint64_t           timeExecUSecs;
+  char               path[PATH_MAX];
+  struct _dynfile_t *src;
+  uint32_t           refs;
+  uint8_t *          data;
+  TAILQ_ENTRY(_dynfile_t) pointers;
+
+};
+
+typedef struct _dynfile_t dynfile_t;
+
+struct strings_t {
+
+  size_t len;
+  TAILQ_ENTRY(strings_t) pointers;
+  char s[];
+
+};
+
+typedef struct {
+
+  uint8_t  pcGuardMap[_HF_PC_GUARD_MAX];
+  uint8_t  bbMapPc[_HF_PERF_BITMAP_SIZE_16M];
+  uint32_t bbMapCmp[_HF_PERF_BITMAP_SIZE_16M];
+  uint64_t pidNewPC[_HF_THREAD_MAX];
+  uint64_t pidNewEdge[_HF_THREAD_MAX];
+  uint64_t pidNewCmp[_HF_THREAD_MAX];
+  uint64_t guardNb;
+  uint64_t pidTotalPC[_HF_THREAD_MAX];
+  uint64_t pidTotalEdge[_HF_THREAD_MAX];
+  uint64_t pidTotalCmp[_HF_THREAD_MAX];
+
+} feedback_t;
+
+typedef struct {
+
+  uint32_t cnt;
+  struct {
+
+    uint8_t  val[32];
+    uint32_t len;
+
+  } valArr[1024 * 16];
+
+} cmpfeedback_t;
+
+typedef struct {
+
+  struct {
+
+    size_t    threadsMax;
+    size_t    threadsFinished;
+    uint32_t  threadsActiveCnt;
+    pthread_t mainThread;
+    pid_t     mainPid;
+    pthread_t threads[_HF_THREAD_MAX];
+
+  } threads;
+
+  struct {
+
+    const char *inputDir;
+    const char *outputDir;
+    DIR *       inputDirPtr;
+    size_t      fileCnt;
+    size_t      testedFileCnt;
+    const char *fileExtn;
+    size_t      maxFileSz;
+    size_t      newUnitsAdded;
+    char        workDir[PATH_MAX];
+    const char *crashDir;
+    const char *covDirNew;
+    bool        saveUnique;
+    size_t      dynfileqMaxSz;
+    size_t      dynfileqCnt;
+    dynfile_t * dynfileqCurrent;
+    dynfile_t * dynfileq2Current;
+    TAILQ_HEAD(dyns_t, _dynfile_t) dynfileq;
+    bool exportFeedback;
+
+  } io;
+
+  struct {
+
+    int                argc;
+    const char *const *cmdline;
+    bool               nullifyStdio;
+    bool               fuzzStdin;
+    const char *       externalCommand;
+    const char *       postExternalCommand;
+    const char *       feedbackMutateCommand;
+    bool               netDriver;
+    bool               persistent;
+    uint64_t           asLimit;
+    uint64_t           rssLimit;
+    uint64_t           dataLimit;
+    uint64_t           coreLimit;
+    uint64_t           stackLimit;
+    bool               clearEnv;
+    char *             env_ptrs[128];
+    char               env_vals[128][4096];
+    sigset_t           waitSigSet;
+
+  } exe;
+
+  struct {
+
+    time_t  timeStart;
+    time_t  runEndTime;
+    time_t  tmOut;
+    time_t  lastCovUpdate;
+    int64_t timeOfLongestUnitUSecs;
+    bool    tmoutVTALRM;
+
+  } timing;
+
+  struct {
+
+    struct {
+
+      uint8_t val[256];
+      size_t  len;
+
+    } dictionary[1024];
+
+    size_t      dictionaryCnt;
+    const char *dictionaryFile;
+    size_t      mutationsMax;
+    unsigned    mutationsPerRun;
+    size_t      maxInputSz;
+
+  } mutate;
+
+  struct {
+
+    bool    useScreen;
+    char    cmdline_txt[65];
+    int64_t lastDisplayUSecs;
+
+  } display;
+
+  struct {
+
+    bool        useVerifier;
+    bool        exitUponCrash;
+    const char *reportFile;
+    size_t      dynFileIterExpire;
+    bool        only_printable;
+    bool        minimize;
+    bool        switchingToFDM;
+
+  } cfg;
+
+  struct {
+
+    bool enable;
+    bool del_report;
+
+  } sanitizer;
+
+  struct {
+
+    fuzzState_t     state;
+    feedback_t *    covFeedbackMap;
+    int             covFeedbackFd;
+    cmpfeedback_t * cmpFeedbackMap;
+    int             cmpFeedbackFd;
+    bool            cmpFeedback;
+    const char *    blacklistFile;
+    uint64_t *      blacklist;
+    size_t          blacklistCnt;
+    bool            skipFeedbackOnTimeout;
+    uint64_t        maxCov[4];
+    dynFileMethod_t dynFileMethod;
+    hwcnt_t         hwCnts;
+
+  } feedback;
+
+  struct {
+
+    size_t mutationsCnt;
+    size_t crashesCnt;
+    size_t uniqueCrashesCnt;
+    size_t verifiedCrashesCnt;
+    size_t blCrashesCnt;
+    size_t timeoutedCnt;
+
+  } cnts;
+
+  struct {
+
+    bool enabled;
+    int  serverSocket;
+    int  clientSocket;
+
+  } socketFuzzer;
+
+  struct {
+
+    pthread_rwlock_t dynfileq;
+    pthread_mutex_t  feedback;
+    pthread_mutex_t  report;
+    pthread_mutex_t  state;
+    pthread_mutex_t  input;
+    pthread_mutex_t  timing;
+
+  } mutex;
+
+  /* For the Linux code */
+  struct {
+
+    int         exeFd;
+    uint64_t    dynamicCutOffAddr;
+    bool        disableRandomization;
+    void *      ignoreAddr;
+    const char *symsBlFile;
+    char **     symsBl;
+    size_t      symsBlCnt;
+    const char *symsWlFile;
+    char **     symsWl;
+    size_t      symsWlCnt;
+    uintptr_t   cloneFlags;
+    tristate_t  useNetNs;
+    bool        kernelOnly;
+    bool        useClone;
+
+  } arch_linux;
+
+  /* For the NetBSD code */
+  struct {
+
+    void *      ignoreAddr;
+    const char *symsBlFile;
+    char **     symsBl;
+    size_t      symsBlCnt;
+    const char *symsWlFile;
+    char **     symsWl;
+    size_t      symsWlCnt;
+
+  } arch_netbsd;
+
+} honggfuzz_t;
+
+typedef enum {
+
+  _HF_RS_UNKNOWN = 0,
+  _HF_RS_WAITING_FOR_INITIAL_READY = 1,
+  _HF_RS_WAITING_FOR_READY = 2,
+  _HF_RS_SEND_DATA = 3,
+
+} runState_t;
+
+typedef struct {
+
+  honggfuzz_t *global;
+  pid_t        pid;
+  int64_t      timeStartedUSecs;
+  char         crashFileName[PATH_MAX];
+  uint64_t     pc;
+  uint64_t     backtrace;
+  uint64_t     access;
+  int          exception;
+  char         report[_HF_REPORT_SIZE];
+  bool         mainWorker;
+  unsigned     mutationsPerRun;
+  dynfile_t *  dynfile;
+  bool         staticFileTryMore;
+  uint32_t     fuzzNo;
+  int          persistentSock;
+  runState_t   runState;
+  bool         tmOutSignaled;
+  char *       args[_HF_ARGS_MAX + 1];
+  int          perThreadCovFeedbackFd;
+  unsigned     triesLeft;
+  dynfile_t *  current;
+#if !defined(_HF_ARCH_DARWIN)
+  timer_t timerId;
+#endif  // !defined(_HF_ARCH_DARWIN)
+  hwcnt_t hwCnts;
+
+  struct {
+
+    /* For Linux code */
+    uint8_t *perfMmapBuf;
+    uint8_t *perfMmapAux;
+    int      cpuInstrFd;
+    int      cpuBranchFd;
+    int      cpuIptBtsFd;
+
+  } arch_linux;
+
+} run_t;
+
+#endif
+
diff --git a/custom_mutators/honggfuzz/input.h b/custom_mutators/honggfuzz/input.h
new file mode 100644
index 00000000..c67d88a6
--- /dev/null
+++ b/custom_mutators/honggfuzz/input.h
@@ -0,0 +1,106 @@
+#ifndef _HG_INPUT_
+#define _HG_INPUT_
+
+#include <stdarg.h>
+#ifdef __clang__
+#include <stdatomic.h>
+#endif
+#include <stdbool.h>
+#include <stdint.h>
+#include <time.h>
+
+#include "honggfuzz.h"
+#include "afl-fuzz.h"
+
+/*
+ * Go-style defer scoped implementation
+ *
+ * If compiled with clang, use: -fblocks -lBlocksRuntime
+ *
+ * Example of use:
+ *
+ * {
+ *   int fd = open(fname, O_RDONLY);
+ *   if (fd == -1) {
+ *     error(....);
+ *     return;
+ *   }
+ *   defer { close(fd); };
+ *   ssize_t sz = read(fd, buf, sizeof(buf));
+ *   ...
+ *   ...
+ * }
+ *
+ */
+
+#define __STRMERGE(a, b) a##b
+#define _STRMERGE(a, b)  __STRMERGE(a, b)
+#ifdef __clang__
+#if __has_extension(blocks)
+static void __attribute__((unused)) __clang_cleanup_func(void (^*dfunc)(void)) {
+    (*dfunc)();
+}
+
+#define defer                                                                                      \
+    void (^_STRMERGE(__defer_f_, __COUNTER__))(void)                                               \
+        __attribute__((cleanup(__clang_cleanup_func))) __attribute__((unused)) = ^
+
+#else /* __has_extension(blocks) */
+#define defer UNIMPLEMENTED - NO - SUPPORT - FOR - BLOCKS - IN - YOUR - CLANG - ENABLED
+#endif /*  __has_extension(blocks) */
+#else  /* !__clang__, e.g.: gcc */
+
+#define __block
+#define _DEFER(a, count)                                                                            \
+    auto void _STRMERGE(__defer_f_, count)(void* _defer_arg __attribute__((unused)));               \
+    int       _STRMERGE(__defer_var_, count) __attribute__((cleanup(_STRMERGE(__defer_f_, count)))) \
+        __attribute__((unused));                                                                    \
+    void _STRMERGE(__defer_f_, count)(void* _defer_arg __attribute__((unused)))
+#define defer _DEFER(a, __COUNTER__)
+#endif /* ifdef __clang__ */
+
+#define HF_MIN(x, y) (x <= y ? x : y)
+#define HF_MAX(x, y) (x >= y ? x : y)
+#define ATOMIC_GET
+#define ARRAYSIZE(x) (sizeof(x) / sizeof(*x))
+#define HF_ATTR_UNUSED __attribute__((unused))
+#define util_Malloc(x) malloc(x)
+
+extern uint8_t *         queue_input;
+extern size_t            queue_input_size;
+extern afl_state_t *     afl_struct;
+
+inline void wmb() { }
+inline void LOG_F(const char *format, ...) { }
+static inline uint64_t util_rndGet(uint64_t min, uint64_t max) {
+  return min + rand_below(afl_struct, max - min + 1);
+}
+static inline uint64_t util_rnd64() { return rand_below(afl_struct, 1 << 30); }
+
+static inline size_t input_getRandomInputAsBuf(run_t *run, const uint8_t **buf) {
+  *buf = queue_input;
+  run->dynfile->data = queue_input;
+  run->dynfile->size = queue_input_size;
+  return queue_input_size;
+}
+static inline void input_setSize(run_t* run, size_t sz) {
+  run->dynfile->size = sz;
+}
+static inline uint8_t util_turnToPrintable(uint8_t* buf, size_t sz) {
+  for (size_t i = 0; i < sz; i++)
+    buf[i] = buf[i] % 95 + 32;
+}
+static inline void util_rndBuf(uint8_t* buf, size_t sz) {
+  if (sz == 0) return;
+  for (size_t i = 0; i < sz; i++)
+    buf[i] = (uint8_t)rand_below(afl_struct, 256);
+}
+static inline uint8_t util_rndPrintable() {
+  return 32 + rand_below(afl_struct, 127 - 32);
+}
+static inline void util_rndBufPrintable(uint8_t* buf, size_t sz) {
+  for (size_t i = 0; i < sz; i++)
+    buf[i] = util_rndPrintable();
+}
+
+#endif
diff --git a/custom_mutators/honggfuzz/libhfcommon b/custom_mutators/honggfuzz/libhfcommon
new file mode 120000
index 00000000..945c9b46
--- /dev/null
+++ b/custom_mutators/honggfuzz/libhfcommon
@@ -0,0 +1 @@
+.
\ No newline at end of file
diff --git a/custom_mutators/honggfuzz/log.h b/custom_mutators/honggfuzz/log.h
new file mode 120000
index 00000000..51e19654
--- /dev/null
+++ b/custom_mutators/honggfuzz/log.h
@@ -0,0 +1 @@
+common.h
\ No newline at end of file
diff --git a/custom_mutators/honggfuzz/mangle.c b/custom_mutators/honggfuzz/mangle.c
new file mode 100644
index 00000000..05e0dcfa
--- /dev/null
+++ b/custom_mutators/honggfuzz/mangle.c
@@ -0,0 +1,1039 @@
+/*
+ *
+ * honggfuzz - run->dynfile->datafer mangling routines
+ * -----------------------------------------
+ *
+ * Author:
+ * Robert Swiecki <swiecki@google.com>
+ *
+ * Copyright 2010-2018 by Google Inc. 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
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ *
+ */
+
+#include "mangle.h"
+
+#include <ctype.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include "input.h"
+#include "libhfcommon/common.h"
+#include "libhfcommon/log.h"
+#include "libhfcommon/util.h"
+
+static inline size_t mangle_LenLeft(run_t *run, size_t off) {
+
+  if (off >= run->dynfile->size) {
+
+    LOG_F("Offset is too large: off:%zu >= len:%zu", off, run->dynfile->size);
+
+  }
+
+  return (run->dynfile->size - off - 1);
+
+}
+
+/* Get a random value between <1:max> with x^2 distribution */
+static inline size_t mangle_getLen(size_t max) {
+
+  if (max > _HF_INPUT_MAX_SIZE) {
+
+    LOG_F("max (%zu) > _HF_INPUT_MAX_SIZE (%zu)", max,
+          (size_t)_HF_INPUT_MAX_SIZE);
+
+  }
+
+  if (max == 0) { LOG_F("max == 0"); }
+  if (max == 1) { return 1; }
+
+  const uint64_t max2 = (uint64_t)max * max;
+  const uint64_t max3 = (uint64_t)max * max * max;
+  const uint64_t rnd = util_rndGet(1, max2 - 1);
+
+  uint64_t ret = rnd * rnd;
+  ret /= max3;
+  ret += 1;
+
+  if (ret < 1) {
+
+    LOG_F("ret (%" PRIu64 ") < 1, max:%zu, rnd:%" PRIu64, ret, max, rnd);
+
+  }
+
+  if (ret > max) {
+
+    LOG_F("ret (%" PRIu64 ") > max (%zu), rnd:%" PRIu64, ret, max, rnd);
+
+  }
+
+  return (size_t)ret;
+
+}
+
+/* Prefer smaller values here, so use mangle_getLen() */
+static inline size_t mangle_getOffSet(run_t *run) {
+
+  return mangle_getLen(run->dynfile->size) - 1;
+
+}
+
+/* Offset which can be equal to the file size */
+static inline size_t mangle_getOffSetPlus1(run_t *run) {
+
+  size_t reqlen = HF_MIN(run->dynfile->size + 1, _HF_INPUT_MAX_SIZE);
+  return mangle_getLen(reqlen) - 1;
+
+}
+
+static inline void mangle_Move(run_t *run, size_t off_from, size_t off_to,
+                               size_t len) {
+
+  if (off_from >= run->dynfile->size) { return; }
+  if (off_to >= run->dynfile->size) { return; }
+  if (off_from == off_to) { return; }
+
+  size_t len_from = run->dynfile->size - off_from;
+  len = HF_MIN(len, len_from);
+
+  size_t len_to = run->dynfile->size - off_to;
+  len = HF_MIN(len, len_to);
+
+  memmove(&run->dynfile->data[off_to], &run->dynfile->data[off_from], len);
+
+}
+
+static inline void mangle_Overwrite(run_t *run, size_t off, const uint8_t *src,
+                                    size_t len, bool printable) {
+
+  if (len == 0) { return; }
+  size_t maxToCopy = run->dynfile->size - off;
+  if (len > maxToCopy) { len = maxToCopy; }
+
+  memmove(&run->dynfile->data[off], src, len);
+  if (printable) { util_turnToPrintable(&run->dynfile->data[off], len); }
+
+}
+
+static inline size_t mangle_Inflate(run_t *run, size_t off, size_t len,
+                                    bool printable) {
+
+  if (run->dynfile->size >= run->global->mutate.maxInputSz) { return 0; }
+  if (len > (run->global->mutate.maxInputSz - run->dynfile->size)) {
+
+    len = run->global->mutate.maxInputSz - run->dynfile->size;
+
+  }
+
+  input_setSize(run, run->dynfile->size + len);
+  mangle_Move(run, off, off + len, run->dynfile->size);
+  if (printable) { memset(&run->dynfile->data[off], ' ', len); }
+
+  return len;
+
+}
+
+static inline void mangle_Insert(run_t *run, size_t off, const uint8_t *val,
+                                 size_t len, bool printable) {
+
+  len = mangle_Inflate(run, off, len, printable);
+  mangle_Overwrite(run, off, val, len, printable);
+
+}
+
+static inline void mangle_UseValue(run_t *run, const uint8_t *val, size_t len,
+                                   bool printable) {
+
+  if (util_rnd64() % 2) {
+
+    mangle_Insert(run, mangle_getOffSetPlus1(run), val, len, printable);
+
+  } else {
+
+    mangle_Overwrite(run, mangle_getOffSet(run), val, len, printable);
+
+  }
+
+}
+
+static void mangle_MemSwap(run_t *run, bool printable HF_ATTR_UNUSED) {
+
+  size_t off1 = mangle_getOffSet(run);
+  size_t maxlen1 = run->dynfile->size - off1;
+
+  size_t off2 = mangle_getOffSet(run);
+  size_t maxlen2 = run->dynfile->size - off2;
+
+  size_t   len = mangle_getLen(HF_MIN(maxlen1, maxlen2));
+  uint8_t *tmpbuf = (uint8_t *)util_Malloc(len);
+  defer {
+
+    free(tmpbuf);
+
+  };
+
+  memcpy(tmpbuf, &run->dynfile->data[off1], len);
+  memmove(&run->dynfile->data[off1], &run->dynfile->data[off2], len);
+  memcpy(&run->dynfile->data[off2], tmpbuf, len);
+
+}
+
+static void mangle_MemCopy(run_t *run, bool printable HF_ATTR_UNUSED) {
+
+  size_t off = mangle_getOffSet(run);
+  size_t len = mangle_getLen(run->dynfile->size - off);
+
+  /* Use a temp buf, as Insert/Inflate can change source bytes */
+  uint8_t *tmpbuf = (uint8_t *)util_Malloc(len);
+  defer {
+
+    free(tmpbuf);
+
+  };
+
+  memcpy(tmpbuf, &run->dynfile->data[off], len);
+
+  mangle_UseValue(run, tmpbuf, len, printable);
+
+}
+
+static void mangle_Bytes(run_t *run, bool printable) {
+
+  uint16_t buf;
+  if (printable) {
+
+    util_rndBufPrintable((uint8_t *)&buf, sizeof(buf));
+
+  } else {
+
+    buf = util_rnd64();
+
+  }
+
+  /* Overwrite with random 1-2-byte values */
+  size_t toCopy = util_rndGet(1, 2);
+  mangle_UseValue(run, (const uint8_t *)&buf, toCopy, printable);
+
+}
+
+static void mangle_ByteRepeatOverwrite(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  size_t destOff = off + 1;
+  size_t maxSz = run->dynfile->size - destOff;
+
+  /* No space to repeat */
+  if (!maxSz) {
+
+    mangle_Bytes(run, printable);
+    return;
+
+  }
+
+  size_t len = mangle_getLen(maxSz);
+  memset(&run->dynfile->data[destOff], run->dynfile->data[off], len);
+
+}
+
+static void mangle_ByteRepeatInsert(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  size_t destOff = off + 1;
+  size_t maxSz = run->dynfile->size - destOff;
+
+  /* No space to repeat */
+  if (!maxSz) {
+
+    mangle_Bytes(run, printable);
+    return;
+
+  }
+
+  size_t len = mangle_getLen(maxSz);
+  len = mangle_Inflate(run, destOff, len, printable);
+  memset(&run->dynfile->data[destOff], run->dynfile->data[off], len);
+
+}
+
+static void mangle_Bit(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  run->dynfile->data[off] ^= (uint8_t)(1U << util_rndGet(0, 7));
+  if (printable) { util_turnToPrintable(&(run->dynfile->data[off]), 1); }
+
+}
+
+static const struct {
+
+  const uint8_t val[8];
+  const size_t  size;
+
+} mangleMagicVals[] = {
+
+    /* 1B - No endianness */
+    {"\x00\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x01\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x02\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x03\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x04\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x05\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x06\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x07\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x08\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x09\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x0A\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x0B\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x0C\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x0D\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x0E\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x0F\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x10\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x20\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x40\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x7E\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x7F\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x80\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\x81\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\xC0\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\xFE\x00\x00\x00\x00\x00\x00\x00", 1},
+    {"\xFF\x00\x00\x00\x00\x00\x00\x00", 1},
+    /* 2B - NE */
+    {"\x00\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x01\x01\x00\x00\x00\x00\x00\x00", 2},
+    {"\x80\x80\x00\x00\x00\x00\x00\x00", 2},
+    {"\xFF\xFF\x00\x00\x00\x00\x00\x00", 2},
+    /* 2B - BE */
+    {"\x00\x01\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x02\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x03\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x04\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x05\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x06\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x07\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x08\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x09\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x0A\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x0B\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x0C\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x0D\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x0E\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x0F\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x10\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x20\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x40\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x7E\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x7F\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x80\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x81\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\xC0\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\xFE\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\xFF\x00\x00\x00\x00\x00\x00", 2},
+    {"\x7E\xFF\x00\x00\x00\x00\x00\x00", 2},
+    {"\x7F\xFF\x00\x00\x00\x00\x00\x00", 2},
+    {"\x80\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x80\x01\x00\x00\x00\x00\x00\x00", 2},
+    {"\xFF\xFE\x00\x00\x00\x00\x00\x00", 2},
+    /* 2B - LE */
+    {"\x00\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x01\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x02\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x03\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x04\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x05\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x06\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x07\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x08\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x09\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x0A\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x0B\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x0C\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x0D\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x0E\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x0F\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x10\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x20\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x40\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x7E\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x7F\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x80\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\x81\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\xC0\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\xFE\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\xFF\x00\x00\x00\x00\x00\x00\x00", 2},
+    {"\xFF\x7E\x00\x00\x00\x00\x00\x00", 2},
+    {"\xFF\x7F\x00\x00\x00\x00\x00\x00", 2},
+    {"\x00\x80\x00\x00\x00\x00\x00\x00", 2},
+    {"\x01\x80\x00\x00\x00\x00\x00\x00", 2},
+    {"\xFE\xFF\x00\x00\x00\x00\x00\x00", 2},
+    /* 4B - NE */
+    {"\x00\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x01\x01\x01\x01\x00\x00\x00\x00", 4},
+    {"\x80\x80\x80\x80\x00\x00\x00\x00", 4},
+    {"\xFF\xFF\xFF\xFF\x00\x00\x00\x00", 4},
+    /* 4B - BE */
+    {"\x00\x00\x00\x01\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x02\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x03\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x04\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x05\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x06\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x07\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x08\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x09\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x0A\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x0B\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x0C\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x0D\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x0E\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x0F\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x10\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x20\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x40\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x7E\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x7F\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x80\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x81\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\xC0\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\xFE\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\xFF\x00\x00\x00\x00", 4},
+    {"\x7E\xFF\xFF\xFF\x00\x00\x00\x00", 4},
+    {"\x7F\xFF\xFF\xFF\x00\x00\x00\x00", 4},
+    {"\x80\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x80\x00\x00\x01\x00\x00\x00\x00", 4},
+    {"\xFF\xFF\xFF\xFE\x00\x00\x00\x00", 4},
+    /* 4B - LE */
+    {"\x00\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x01\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x02\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x03\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x04\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x05\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x06\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x07\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x08\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x09\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x0A\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x0B\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x0C\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x0D\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x0E\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x0F\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x10\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x20\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x40\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x7E\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x7F\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x80\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\x81\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\xC0\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\xFE\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\xFF\x00\x00\x00\x00\x00\x00\x00", 4},
+    {"\xFF\xFF\xFF\x7E\x00\x00\x00\x00", 4},
+    {"\xFF\xFF\xFF\x7F\x00\x00\x00\x00", 4},
+    {"\x00\x00\x00\x80\x00\x00\x00\x00", 4},
+    {"\x01\x00\x00\x80\x00\x00\x00\x00", 4},
+    {"\xFE\xFF\xFF\xFF\x00\x00\x00\x00", 4},
+    /* 8B - NE */
+    {"\x00\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x01\x01\x01\x01\x01\x01\x01\x01", 8},
+    {"\x80\x80\x80\x80\x80\x80\x80\x80", 8},
+    {"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8},
+    /* 8B - BE */
+    {"\x00\x00\x00\x00\x00\x00\x00\x01", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x02", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x03", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x04", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x05", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x06", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x07", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x08", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x09", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x0A", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x0B", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x0C", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x0D", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x0E", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x0F", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x10", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x20", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x40", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x7E", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x7F", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x80", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x81", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\xC0", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\xFE", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\xFF", 8},
+    {"\x7E\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8},
+    {"\x7F\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8},
+    {"\x80\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x80\x00\x00\x00\x00\x00\x00\x01", 8},
+    {"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFE", 8},
+    /* 8B - LE */
+    {"\x00\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x01\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x02\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x03\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x04\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x05\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x06\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x07\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x08\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x09\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x0A\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x0B\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x0C\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x0D\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x0E\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x0F\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x10\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x20\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x40\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x7E\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x7F\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x80\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\x81\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\xC0\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\xFE\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\xFF\x00\x00\x00\x00\x00\x00\x00", 8},
+    {"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7E", 8},
+    {"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 8},
+    {"\x00\x00\x00\x00\x00\x00\x00\x80", 8},
+    {"\x01\x00\x00\x00\x00\x00\x00\x80", 8},
+    {"\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8},
+
+};
+
+static void mangle_Magic(run_t *run, bool printable) {
+
+  uint64_t choice = util_rndGet(0, ARRAYSIZE(mangleMagicVals) - 1);
+  mangle_UseValue(run, mangleMagicVals[choice].val,
+                  mangleMagicVals[choice].size, printable);
+
+}
+
+static void mangle_StaticDict(run_t *run, bool printable) {
+
+  if (run->global->mutate.dictionaryCnt == 0) {
+
+    mangle_Bytes(run, printable);
+    return;
+
+  }
+
+  uint64_t choice = util_rndGet(0, run->global->mutate.dictionaryCnt - 1);
+  mangle_UseValue(run, run->global->mutate.dictionary[choice].val,
+                  run->global->mutate.dictionary[choice].len, printable);
+
+}
+
+static inline const uint8_t *mangle_FeedbackDict(run_t *run, size_t *len) {
+
+  if (!run->global->feedback.cmpFeedback) { return NULL; }
+  cmpfeedback_t *cmpf = run->global->feedback.cmpFeedbackMap;
+  uint32_t       cnt = ATOMIC_GET(cmpf->cnt);
+  if (cnt == 0) { return NULL; }
+  if (cnt > ARRAYSIZE(cmpf->valArr)) { cnt = ARRAYSIZE(cmpf->valArr); }
+  uint32_t choice = util_rndGet(0, cnt - 1);
+  *len = (size_t)ATOMIC_GET(cmpf->valArr[choice].len);
+  if (*len == 0) { return NULL; }
+  return cmpf->valArr[choice].val;
+
+}
+
+static void mangle_ConstFeedbackDict(run_t *run, bool printable) {
+
+  size_t         len;
+  const uint8_t *val = mangle_FeedbackDict(run, &len);
+  if (val == NULL) {
+
+    mangle_Bytes(run, printable);
+    return;
+
+  }
+
+  mangle_UseValue(run, val, len, printable);
+
+}
+
+static void mangle_MemSet(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  size_t len = mangle_getLen(run->dynfile->size - off);
+  int    val =
+      printable ? (int)util_rndPrintable() : (int)util_rndGet(0, UINT8_MAX);
+
+  memset(&run->dynfile->data[off], val, len);
+
+}
+
+static void mangle_RandomOverwrite(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  size_t len = mangle_getLen(run->dynfile->size - off);
+  if (printable) {
+
+    util_rndBufPrintable(&run->dynfile->data[off], len);
+
+  } else {
+
+    util_rndBuf(&run->dynfile->data[off], len);
+
+  }
+
+}
+
+static void mangle_RandomInsert(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  size_t len = mangle_getLen(run->dynfile->size - off);
+
+  len = mangle_Inflate(run, off, len, printable);
+
+  if (printable) {
+
+    util_rndBufPrintable(&run->dynfile->data[off], len);
+
+  } else {
+
+    util_rndBuf(&run->dynfile->data[off], len);
+
+  }
+
+}
+
+static inline void mangle_AddSubWithRange(run_t *run, size_t off, size_t varLen,
+                                          uint64_t range, bool printable) {
+
+  int64_t delta = (int64_t)util_rndGet(0, range * 2) - (int64_t)range;
+
+  switch (varLen) {
+
+    case 1: {
+
+      run->dynfile->data[off] += delta;
+      break;
+
+    }
+
+    case 2: {
+
+      int16_t val;
+      memcpy(&val, &run->dynfile->data[off], sizeof(val));
+      if (util_rnd64() & 0x1) {
+
+        val += delta;
+
+      } else {
+
+        /* Foreign endianess */
+        val = __builtin_bswap16(val);
+        val += delta;
+        val = __builtin_bswap16(val);
+
+      }
+
+      mangle_Overwrite(run, off, (uint8_t *)&val, varLen, printable);
+      break;
+
+    }
+
+    case 4: {
+
+      int32_t val;
+      memcpy(&val, &run->dynfile->data[off], sizeof(val));
+      if (util_rnd64() & 0x1) {
+
+        val += delta;
+
+      } else {
+
+        /* Foreign endianess */
+        val = __builtin_bswap32(val);
+        val += delta;
+        val = __builtin_bswap32(val);
+
+      }
+
+      mangle_Overwrite(run, off, (uint8_t *)&val, varLen, printable);
+      break;
+
+    }
+
+    case 8: {
+
+      int64_t val;
+      memcpy(&val, &run->dynfile->data[off], sizeof(val));
+      if (util_rnd64() & 0x1) {
+
+        val += delta;
+
+      } else {
+
+        /* Foreign endianess */
+        val = __builtin_bswap64(val);
+        val += delta;
+        val = __builtin_bswap64(val);
+
+      }
+
+      mangle_Overwrite(run, off, (uint8_t *)&val, varLen, printable);
+      break;
+
+    }
+
+    default: {
+
+      LOG_F("Unknown variable length size: %zu", varLen);
+
+    }
+
+  }
+
+}
+
+static void mangle_AddSub(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+
+  /* 1,2,4,8 */
+  size_t varLen = 1U << util_rndGet(0, 3);
+  if ((run->dynfile->size - off) < varLen) { varLen = 1; }
+
+  uint64_t range;
+  switch (varLen) {
+
+    case 1:
+      range = 16;
+      break;
+    case 2:
+      range = 4096;
+      break;
+    case 4:
+      range = 1048576;
+      break;
+    case 8:
+      range = 268435456;
+      break;
+    default:
+      LOG_F("Invalid operand size: %zu", varLen);
+
+  }
+
+  mangle_AddSubWithRange(run, off, varLen, range, printable);
+
+}
+
+static void mangle_IncByte(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  if (printable) {
+
+    run->dynfile->data[off] = (run->dynfile->data[off] - 32 + 1) % 95 + 32;
+
+  } else {
+
+    run->dynfile->data[off] += (uint8_t)1UL;
+
+  }
+
+}
+
+static void mangle_DecByte(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  if (printable) {
+
+    run->dynfile->data[off] = (run->dynfile->data[off] - 32 + 94) % 95 + 32;
+
+  } else {
+
+    run->dynfile->data[off] -= (uint8_t)1UL;
+
+  }
+
+}
+
+static void mangle_NegByte(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  if (printable) {
+
+    run->dynfile->data[off] = 94 - (run->dynfile->data[off] - 32) + 32;
+
+  } else {
+
+    run->dynfile->data[off] = ~(run->dynfile->data[off]);
+
+  }
+
+}
+
+static void mangle_Expand(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+  size_t len;
+  if (util_rnd64() % 16) {
+
+    len = mangle_getLen(HF_MIN(16, run->global->mutate.maxInputSz - off));
+
+  } else {
+
+    len = mangle_getLen(run->global->mutate.maxInputSz - off);
+
+  }
+
+  mangle_Inflate(run, off, len, printable);
+
+}
+
+static void mangle_Shrink(run_t *run, bool printable HF_ATTR_UNUSED) {
+
+  if (run->dynfile->size <= 2U) { return; }
+
+  size_t off_start = mangle_getOffSet(run);
+  size_t len = mangle_LenLeft(run, off_start);
+  if (len == 0) { return; }
+  if (util_rnd64() % 16) {
+
+    len = mangle_getLen(HF_MIN(16, len));
+
+  } else {
+
+    len = mangle_getLen(len);
+
+  }
+
+  size_t off_end = off_start + len;
+  size_t len_to_move = run->dynfile->size - off_end;
+
+  mangle_Move(run, off_end, off_start, len_to_move);
+  input_setSize(run, run->dynfile->size - len);
+
+}
+
+static void mangle_ASCIINum(run_t *run, bool printable) {
+
+  size_t len = util_rndGet(2, 8);
+
+  char buf[20];
+  snprintf(buf, sizeof(buf), "%-19" PRId64, (int64_t)util_rnd64());
+
+  mangle_UseValue(run, (const uint8_t *)buf, len, printable);
+
+}
+
+static void mangle_ASCIINumChange(run_t *run, bool printable) {
+
+  size_t off = mangle_getOffSet(run);
+
+  /* Find a digit */
+  for (; off < run->dynfile->size; off++) {
+
+    if (isdigit(run->dynfile->data[off])) { break; }
+
+  }
+
+  if (off == run->dynfile->size) {
+
+    mangle_Bytes(run, printable);
+    return;
+
+  }
+
+  size_t len = HF_MIN(20, run->dynfile->size - off);
+  char   numbuf[21] = {};
+  strncpy(numbuf, (const char *)&run->dynfile->data[off], len);
+  uint64_t val = (uint64_t)strtoull(numbuf, NULL, 10);
+
+  switch (util_rndGet(0, 5)) {
+
+    case 0:
+      val += util_rndGet(1, 256);
+      break;
+    case 1:
+      val -= util_rndGet(1, 256);
+      break;
+    case 2:
+      val *= util_rndGet(1, 256);
+      break;
+    case 3:
+      val /= util_rndGet(1, 256);
+      break;
+    case 4:
+      val = ~(val);
+      break;
+    case 5:
+      val = util_rnd64();
+      break;
+    default:
+      LOG_F("Invalid choice");
+
+  };
+
+  len = HF_MIN((size_t)snprintf(numbuf, sizeof(numbuf), "%" PRIu64, val), len);
+  mangle_Overwrite(run, off, (const uint8_t *)numbuf, len, printable);
+
+}
+
+static void mangle_Splice(run_t *run, bool printable) {
+
+  const uint8_t *buf;
+  size_t         sz = input_getRandomInputAsBuf(run, &buf);
+  if (!sz) {
+
+    mangle_Bytes(run, printable);
+    return;
+
+  }
+
+  size_t remoteOff = mangle_getLen(sz) - 1;
+  size_t len = mangle_getLen(sz - remoteOff);
+  mangle_UseValue(run, &buf[remoteOff], len, printable);
+
+}
+
+static void mangle_Resize(run_t *run, bool printable) {
+
+  ssize_t oldsz = run->dynfile->size;
+  ssize_t newsz = 0;
+
+  uint64_t choice = util_rndGet(0, 32);
+  switch (choice) {
+
+    case 0:                                     /* Set new size arbitrarily */
+      newsz = (ssize_t)util_rndGet(1, run->global->mutate.maxInputSz);
+      break;
+    case 1 ... 4:                         /* Increase size by a small value */
+      newsz = oldsz + (ssize_t)util_rndGet(0, 8);
+      break;
+    case 5:                              /* Increase size by a larger value */
+      newsz = oldsz + (ssize_t)util_rndGet(9, 128);
+      break;
+    case 6 ... 9:                         /* Decrease size by a small value */
+      newsz = oldsz - (ssize_t)util_rndGet(0, 8);
+      break;
+    case 10:                             /* Decrease size by a larger value */
+      newsz = oldsz - (ssize_t)util_rndGet(9, 128);
+      break;
+    case 11 ... 32:                                           /* Do nothing */
+      newsz = oldsz;
+      break;
+    default:
+      LOG_F("Illegal value from util_rndGet: %" PRIu64, choice);
+      break;
+
+  }
+
+  if (newsz < 1) { newsz = 1; }
+  if (newsz > (ssize_t)run->global->mutate.maxInputSz) {
+
+    newsz = run->global->mutate.maxInputSz;
+
+  }
+
+  input_setSize(run, (size_t)newsz);
+  if (newsz > oldsz) {
+
+    if (printable) { memset(&run->dynfile->data[oldsz], ' ', newsz - oldsz); }
+
+  }
+
+}
+
+void mangle_mangleContent(run_t *run, int speed_factor) {
+
+  static void (*const mangleFuncs[])(run_t * run, bool printable) = {
+
+      /* Every *Insert or Expand expands file, so add more Shrink's */
+      mangle_Shrink,
+      mangle_Shrink,
+      mangle_Shrink,
+      mangle_Shrink,
+      mangle_Expand,
+      mangle_Bit,
+      mangle_IncByte,
+      mangle_DecByte,
+      mangle_NegByte,
+      mangle_AddSub,
+      mangle_MemSet,
+      mangle_MemSwap,
+      mangle_MemCopy,
+      mangle_Bytes,
+      mangle_ASCIINum,
+      mangle_ASCIINumChange,
+      mangle_ByteRepeatOverwrite,
+      mangle_ByteRepeatInsert,
+      mangle_Magic,
+      mangle_StaticDict,
+      mangle_ConstFeedbackDict,
+      mangle_RandomOverwrite,
+      mangle_RandomInsert,
+      mangle_Splice,
+
+  };
+
+  if (run->mutationsPerRun == 0U) { return; }
+  if (run->dynfile->size == 0U) {
+
+    mangle_Resize(run, /* printable= */ run->global->cfg.only_printable);
+
+  }
+
+  uint64_t changesCnt = run->global->mutate.mutationsPerRun;
+
+  if (speed_factor < 5) {
+
+    changesCnt = util_rndGet(1, run->global->mutate.mutationsPerRun);
+
+  } else if (speed_factor < 10) {
+
+    changesCnt = run->global->mutate.mutationsPerRun;
+
+  } else {
+
+    changesCnt = HF_MIN(speed_factor, 12);
+    changesCnt = HF_MAX(changesCnt, run->global->mutate.mutationsPerRun);
+
+  }
+
+  /* If last coverage acquisition was more than 5 secs ago, use splicing more
+   * frequently */
+  if ((time(NULL) - ATOMIC_GET(run->global->timing.lastCovUpdate)) > 5) {
+
+    if (util_rnd64() % 2) {
+
+      mangle_Splice(run, run->global->cfg.only_printable);
+
+    }
+
+  }
+
+  for (uint64_t x = 0; x < changesCnt; x++) {
+
+    uint64_t choice = util_rndGet(0, ARRAYSIZE(mangleFuncs) - 1);
+    mangleFuncs[choice](run, /* printable= */ run->global->cfg.only_printable);
+
+  }
+
+  wmb();
+
+}
+
diff --git a/custom_mutators/honggfuzz/mangle.h b/custom_mutators/honggfuzz/mangle.h
new file mode 100644
index 00000000..1b6a4943
--- /dev/null
+++ b/custom_mutators/honggfuzz/mangle.h
@@ -0,0 +1,32 @@
+/*
+ *
+ * honggfuzz - buffer mangling routines
+ * -----------------------------------------
+ *
+ * Author: Robert Swiecki <swiecki@google.com>
+ *
+ * Copyright 2010-2018 by Google Inc. 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
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ *
+ */
+
+#ifndef _HF_MANGLE_H_
+#define _HF_MANGLE_H_
+
+#include "honggfuzz.h"
+
+extern void mangle_mangleContent(run_t *run, int speed_factor);
+
+#endif
+
diff --git a/custom_mutators/honggfuzz/util.h b/custom_mutators/honggfuzz/util.h
new file mode 120000
index 00000000..51e19654
--- /dev/null
+++ b/custom_mutators/honggfuzz/util.h
@@ -0,0 +1 @@
+common.h
\ No newline at end of file