├── examples
    ├── demo
    │   ├── input
    │   │   └── sample
    │   ├── Makefile
    │   ├── demo-app.c
    │   └── demo-app-posix.c
    └── libpng
    │   ├── README.md
    │   ├── libpng-nocrc.diff
    │   ├── build.sh
    │   ├── readpng.h
    │   ├── readpng.c
    │   ├── readpng-pers.c
    │   └── readpng-fiow.c
├── afl-fiow-stats.png
├── afl-pers-stats.png
├── Dockerfile
├── Makefile
├── libfiodef.h
├── Performance.md
├── README.md
├── LICENSE
├── libfioinfo.c
└── libfiowrapper.c


/examples/demo/input/sample:
--------------------------------------------------------------------------------
1 | fooxxx
2 | 


--------------------------------------------------------------------------------
/afl-fiow-stats.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/marekzmyslowski/libfiowrapper/HEAD/afl-fiow-stats.png


--------------------------------------------------------------------------------
/afl-pers-stats.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/marekzmyslowski/libfiowrapper/HEAD/afl-pers-stats.png


--------------------------------------------------------------------------------
/examples/libpng/README.md:
--------------------------------------------------------------------------------
 1 | This is libpng example.
 2 | 
 3 | ## Building
 4 | The simple way is just to run the ```./build.sh``` script. It downloads libpng, applies patches, compiles and build the ```readpng.c``` application ready to fuzz.
 5 | 
 6 | ```
 7 | export LD_LIBRARY_PATH=<path to directory with libfiowrapper.so>
 8 | afl-fuzz -i ./input-png/ -o ./output -- ./readpng @@
 9 | ```
10 | 


--------------------------------------------------------------------------------
/examples/libpng/libpng-nocrc.diff:
--------------------------------------------------------------------------------
 1 | diff --git a/pngrutil.c b/pngrutil.c
 2 | index 4db3de990..1868af672 100644
 3 | --- a/pngrutil.c
 4 | +++ b/pngrutil.c
 5 | @@ -277,7 +277,7 @@ png_crc_error(png_structrp png_ptr)
 6 |     if (need_crc != 0)
 7 |     {
 8 |        crc = png_get_uint_32(crc_bytes);
 9 | -      return ((int)(crc != png_ptr->crc));
10 | +      return ((int)(1 != 1));
11 |     }
12 | 
13 |     else
14 | 
15 | 


--------------------------------------------------------------------------------
/Dockerfile:
--------------------------------------------------------------------------------
 1 | FROM ubuntu:20.10
 2 | 
 3 | ARG DEBIAN_FRONTEND=noninteractive
 4 | 
 5 | RUN apt-get update  && apt-get upgrade -y && \
 6 |     apt-get -y install wget git cmake subversion build-essential libtool-bin python3-dev automake flex bison libglib2.0-dev libpixman-1-dev clang python3-setuptools llvm gcc-10-plugin-dev
 7 | 
 8 | 
 9 | RUN mkdir /work 
10 | WORKDIR /work
11 | RUN git clone https://github.com/AFLplusplus/AFLplusplus.git aflpp
12 | RUN cd aflpp && make && make install
13 | 
14 | RUN git clone https://github.com/marekzmyslowski/libfiowrapper.git
15 | WORKDIR /work/libfiowrapper
16 | RUN make all
17 | 
18 | 


--------------------------------------------------------------------------------
/examples/libpng/build.sh:
--------------------------------------------------------------------------------
 1 | #!/bin/sh
 2 | 
 3 | # Clone the libpng directory
 4 | git clone https://git.code.sf.net/p/libpng/code libpng-code
 5 | 
 6 | # Build libpng
 7 | cd libpng-code
 8 | git apply ../libpng-nocrc.diff
 9 | mkdir afl-build
10 | cd afl-build
11 | CC=afl-clang-fast cmake ..
12 | make
13 | cd ../..
14 | 
15 | # Build harness files.
16 | afl-clang-fast readpng-fiow.c -o readpng-fiow ./libpng-code/afl-build/libpng16.a -lz -lm -L../../ -lfiowrapper -I./libpng-code/afl-build -I./libpng-code
17 | afl-clang-fast readpng-pers.c -o readpng-pers ./libpng-code/afl-build/libpng16.a -lz -lm -I./libpng-code/afl-build -I./libpng-code
18 | afl-clang-fast readpng.c -o readpng ./libpng-code/afl-build/libpng16.a -lz -lm -I./libpng-code/afl-build -I./libpng-code
19 | 
20 | # Download corpus and reduce the file to size 10K
21 | svn export https://github.com/mozillasecurity/fuzzdata.git/trunk/samples/png input-png
22 | cd input-png
23 | mv ./chrome/* ./
24 | mv ./common/* ./
25 | rm -rf ./chrome
26 | rm -rf common
27 | find ./ -type f -size +10k | xargs rm


--------------------------------------------------------------------------------
/Makefile:
--------------------------------------------------------------------------------
 1 | 
 2 | CC = clang
 3 | CFLAGS = -ldl -fPIC -shared
 4 | 
 5 | .PHONY: all debug demo examples help
 6 | 
 7 | help:
 8 | 	@echo ''
 9 | 	@echo ' usage: make [target]'
10 | 	@echo ''
11 | 	@echo '	release		- build release version of the libraries'
12 | 	@echo '	debug 		- build debug version of the libraries'
13 | 	@echo '	all 		- build everything (release, demo, example)'
14 | 	@echo '	demo 		- build demo applications'
15 | 	@echo '	examples	- build example applications'
16 | 	@echo '	clean		- clean libraries and demo applications'
17 | 	@echo ''
18 | 
19 | all: release demo examples
20 | 
21 | release: libfioinfo libfiowrapper
22 | release: CFLAGS += -O3
23 | 
24 | debug: CFLAGS += -DDEBUG
25 | debug: libfioinfo libfiowrapper
26 | 
27 | demo:
28 | 	$(MAKE) -C ./examples/demo
29 | 
30 | examples:
31 | 	cd ./examples/libpng; ./build.sh
32 | 
33 | libfioinfo: libfioinfo.c
34 | 	$(CC) $(CFLAGS) $? -o $@.so 
35 | 
36 | libfiowrapper: libfiowrapper.c
37 | 	$(CC) $(CFLAGS) $? -o $@.so 
38 | 
39 | clean:
40 | 	rm -f libfioinfo.so libfiowrapper.so
41 | 	$(MAKE) clean -C ./examples/demo


--------------------------------------------------------------------------------
/examples/demo/Makefile:
--------------------------------------------------------------------------------
 1 | CC := clang
 2 | AFLCC := afl-clang-fast
 3 | LDFLAGS := -L../../ -lfiowrapper
 4 | 
 5 | all: info-demo file-fuzz-demo mem-fuzz-demo per-fuzz-demo info-demo-posix file-fuzz-demo-posix mem-fuzz-demo-posix per-fuzz-demo-posix
 6 | .PHONE: all
 7 | 
 8 | info-demo: demo-app.c
 9 | 	$(CC) $(CFLAGS) $? -o $@
10 | 
11 | file-fuzz-demo: demo-app.c
12 | 	$(AFLCC) $(CFLAGS) $? -o $@
13 | 
14 | per-fuzz-demo: demo-app.c
15 | 	$(AFLCC) $(CFLAGS)  $? -DAFL_PERSISTENT -o $@
16 | 
17 | mem-fuzz-demo: demo-app.c
18 | 	$(AFLCC) $(CFLAGS) $(LDFLAGS) $? -DAFL_MEMORY -o $@
19 | 
20 | info-demo-posix: demo-app-posix.c
21 | 	$(CC) $(CFLAGS) $? -o $@
22 | 
23 | file-fuzz-demo-posix: demo-app-posix.c
24 | 	$(AFLCC) $(CFLAGS) $? -o $@
25 | 
26 | per-fuzz-demo-posix: demo-app-posix.c
27 | 	$(AFLCC) $(CFLAGS)  $? -DAFL_PERSISTENT -o $@
28 | 
29 | mem-fuzz-demo-posix: demo-app-posix.c
30 | 	$(AFLCC) $(CFLAGS) $(LDFLAGS) $? -DAFL_MEMORY -o $@
31 | 
32 | clean:
33 | 	rm -f info-demo file-fuzz-demo mem-fuzz-demo per-fuzz-demo info-demo-posix file-fuzz-demo-posix mem-fuzz-demo-posix per-fuzz-demo-posix


--------------------------------------------------------------------------------
/libfiodef.h:
--------------------------------------------------------------------------------
 1 | #ifndef __LIBFIODEF_H
 2 | #define __LIBFIODEF_H
 3 | 
 4 | #include <stdlib.h>
 5 | #include <stdio.h>
 6 | 
 7 | /*
 8 |  * THe pointer definitions for the original functions that are hooked.
 9 |  */
10 | 
11 | // Standard stdio functions
12 | static FILE *(*_libc_fopen)(const char *path, const char *mode);
13 | 
14 | static size_t (*_libc_fwrite)(const void *ptr, size_t size, size_t nmemb, FILE *stream);
15 | static int (*_libc_fputc)(int character, FILE *stream);
16 | static int (*_libc_fputs)(const char *str, FILE *stream);
17 | static size_t (*_libc_fread)(void *ptr, size_t size, size_t nmemb, FILE *stream);
18 | static int (*_libc_fgetc)(FILE *stream);
19 | static char *(*_libc_fgets)(char *str, int num, FILE *stream);
20 | 
21 | static int (*_libc_fseek)(FILE *stream, long offset, int whence);
22 | static int (*_libc_fseeko)(FILE *stream, off_t offset, int whence);
23 | static int (*_libc_fseeko64)(FILE *stream, off64_t offset, int whence);
24 | 
25 | static long (*_libc_ftell)(FILE *stream);
26 | static off_t (*_libc_ftello)(FILE *stream);
27 | 
28 | #if defined(_LARGEFILE64_SOURCE) && !defined(__APPLE__)
29 | static FILE * (*_libc_fopen64)(const char *path, const char *mode);
30 | static int (*_libc_fseeko64)(FILE *stream, off64_t offset, int whence);
31 | static off64_t (*_libc_ftello64)(FILE *stream);
32 | #endif
33 | 
34 | static int (*_libc_fclose)(FILE *stream);
35 | static int (*_libc_fileno)(FILE *stream);
36 | 
37 | // Nonlocking stdio functions
38 | static size_t (*_libc_fwrite_unlocked)(const void *ptr, size_t size, size_t nmemb, FILE *stream);
39 | static int (*_libc_fputc_unlocked)(int character, FILE *stream);
40 | static int (*_libc_fputs_unlocked)(const char *str, FILE *stream);
41 | static size_t (*_libc_fread_unlocked)(void *ptr, size_t size, size_t nmemb, FILE *stream);
42 | static int (*_libc_fgetc_unlocked)(FILE *stream);
43 | static char *(*_libc_fgets_unlocked)(char *str, int num, FILE *stream);
44 | static int (*_libc_fileno_unlocked)(FILE *stream);
45 | 
46 | // POSIX functions
47 | static int (* _posix_open)(const char *pathname, int flags, ...);
48 | static ssize_t (* _posix_read)(int fd, void *buf, size_t count);
49 | static ssize_t (* _posix_write)(int fd, const void *buf, size_t count);
50 | static off_t (* _posix_lseek)(int fd, off_t offset, int whence);
51 | 
52 | static int (* _posix_close)(int fd);
53 | 
54 | 
55 | #endif
56 | 


--------------------------------------------------------------------------------
/examples/demo/demo-app.c:
--------------------------------------------------------------------------------
  1 | /*
  2 |    american fuzzy lop++ - persistent mode example
  3 |    --------------------------------------------
  4 | 
  5 |    Originally written by Michal Zalewski
  6 | 
  7 |    Copyright 2015 Google Inc. All rights reserved.
  8 | 
  9 |    Modifed: Marek Zmysłowski
 10 |    Copyright: 2020
 11 | 
 12 |    Licensed under the Apache License, Version 2.0 (the "License");
 13 |    you may not use this file except in compliance with the License.
 14 |    You may obtain a copy of the License at:
 15 | 
 16 |      http://www.apache.org/licenses/LICENSE-2.0
 17 | 
 18 |    This file demonstrates the high-performance "persistent mode" that may be
 19 |    suitable for fuzzing certain fast and well-behaved libraries, provided that
 20 |    they are stateless or that their internal state can be easily reset
 21 |    across runs.
 22 | 
 23 |    To make this work, the library and this shim need to be compiled in LLVM
 24 |    mode using afl-clang-fast (other compiler wrappers will *not* work).
 25 | 
 26 |  */
 27 | 
 28 | 
 29 | #include <stdio.h>
 30 | #include <stdlib.h>
 31 | #include <unistd.h>
 32 | #include <signal.h>
 33 | #include <string.h>
 34 | 
 35 | #ifdef AFL_MEMORY
 36 | __AFL_FUZZ_INIT();
 37 | extern void set_memory_size(ssize_t size);
 38 | extern void set_memory_ptr(unsigned char *buffer);
 39 | #endif
 40 | 
 41 | 
 42 | 
 43 | /* Main entry point. */
 44 | 
 45 | int main(int argc, char **argv) {
 46 | 
 47 |   ssize_t        len;                        /* how much input did we read? */
 48 |   unsigned char  *buf;                        /* test case buffer pointer    */
 49 |   FILE           *file;
 50 | 
 51 |   /* The number passed to __AFL_LOOP() controls the maximum number of
 52 |      iterations before the loop exits and the program is allowed to
 53 |      terminate normally. This limits the impact of accidental memory leaks
 54 |      and similar hiccups. */
 55 | #ifdef AFL_MEMORY
 56 |     // Set the memory pointer inside library.
 57 |     set_memory_ptr(__AFL_FUZZ_TESTCASE_BUF);
 58 | 
 59 | 
 60 |   while (__AFL_LOOP(1000)) {
 61 |     // Set the file size.
 62 |     set_memory_size(__AFL_FUZZ_TESTCASE_LEN);
 63 | #endif
 64 | #ifdef AFL_PERSISTENT
 65 |   __AFL_INIT();
 66 |   while (__AFL_LOOP(1000)) {
 67 | #endif
 68 |     file = fopen(argv[1], "r");
 69 |     if (fgetc(file) == 'f') {
 70 | 
 71 |       printf("one\n");
 72 |       if (fgetc(file) == 'o') {
 73 | 
 74 |         printf("two\n");
 75 |         if (fgetc(file) == 'o') {
 76 | 
 77 |           printf("three\n");
 78 |           if (fgetc(file) == '!') {
 79 | 
 80 |             printf("four\n");
 81 |             if (fgetc(file) == '!') {
 82 | 
 83 |               printf("five\n");
 84 |               if (fgetc(file) == '!') {
 85 | 
 86 |                 printf("six\n");
 87 |                 abort();
 88 | 
 89 |               }
 90 | 
 91 |             }
 92 | 
 93 |           }
 94 | 
 95 |         }
 96 | 
 97 |       }
 98 | 
 99 |     }
100 |     fclose(file);
101 |     /*** END PLACEHOLDER CODE ***/
102 | #if defined AFL_MEMORY || defined AFL_PERSISTENT
103 |   }
104 | #endif
105 |   /* Once the loop is exited, terminate normally - AFL will restart the process
106 |      when this happens, with a clean slate when it comes to allocated memory,
107 |      leftover file descriptors, etc. */
108 | 
109 |   return 0;
110 | 
111 | }
112 | 
113 | 


--------------------------------------------------------------------------------
/Performance.md:
--------------------------------------------------------------------------------
 1 | # Performance
 2 | The performance test was done on the libpng library with readpng console application. Original source code is available [here](./examples/libpng/readpng.c).
 3 | 
 4 | ## Setup
 5 | For this test, two cases ware prepared. Original file was changed to be fuzzed in the persistent mode and the persistent mode with libfiowrapper. Following diff shows differences between the files. As it can be seen, only few addition lines were added for the libfiowrapper.
 6 | ```
 7 | /research/libfiowrapper/examples/libpng$ diff -u readpng-pers.c readpng-fiow.c
 8 | --- readpng-pers.c      2020-11-02 22:58:56.207491235 +0100
 9 | +++ readpng-fiow.c      2020-11-02 23:07:21.736258287 +0100
10 | @@ -55,7 +55,7 @@
11 |    /*
12 |     * Modified by: Marek Zmysłowski
13 |     * Copyrights: 2020
14 | -   * This file contains code to be fuzzed in persistent mode.
15 | +   * This file contains code to be fuzzed in persistent mode with libfiowrapper.
16 |     */
17 |  
18 |  #include <stdio.h>
19 | @@ -66,6 +66,10 @@
20 |  #include "png.h"        /* libpng header; includes zlib.h */
21 |  #include "readpng.h"    /* typedefs, common macros, public prototypes */
22 |  
23 | +__AFL_FUZZ_INIT();
24 | +extern void set_memory_size(ssize_t size);
25 | +extern void set_memory_ptr(unsigned char *buffer);
26 | +
27 |  /* future versions of libpng will provide this macro: */
28 |  #ifndef png_jmpbuf
29 |  #  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
30 | @@ -317,8 +321,12 @@
31 |      uch red, green, blue;
32 |      int pChannels;
33 |      ulg pRowbytes;
34 | +    // Set the memory pointer
35 | +    set_memory_ptr(__AFL_FUZZ_TESTCASE_BUF);
36 |      while (__AFL_LOOP(65535))
37 |      {
38 | +        // Set the file size.
39 | +        set_memory_size(__AFL_FUZZ_TESTCASE_LEN);
40 |          image_data = NULL;
41 |          infile = fopen(argv[1], "r");
42 |          if (!readpng_init(infile, &w, &h)) {
43 | ```
44 | The following commands were used to build the executables:
45 | ```
46 | afl-clang-fast readpng-fiow.c -o readpng-fiow ./libpng-code/afl-build/libpng16.a -lz -lm -L../../ -lfiowrapper -I./libpng-code/afl-build -I./libpng-code
47 | ```
48 | ```
49 | afl-clang-fast readpng-pers.c -o readpng-pers ./libpng-code/afl-build/libpng16.a -lz -lm -I./libpng-code/afl-build -I./libpng-code
50 | ```
51 | 
52 | ## Results:
53 | There were 4 tests performed, each took 4 hours with the AFL++. In every case the same seed was used.  The following command was used:
54 | ```
55 | afl-fuzz  -i ./input-png/ -o ./output  -s 1234 -V 14400 -p seek -M fiow -m none -- ./readpng-fiow @@
56 | 
57 | afl-fuzz  -i ./input-png/ -o ./output  -s 1234 -V 14400 -p seek -M pers -m none -- ./readpng-pers @@
58 | ```
59 | Here are the results:
60 | 
61 | |   | Persistent Mode  | libfiowrapper  |
62 | |---|---|---|
63 | | Total execs (Avg) | 76,5M | 140M |
64 | | Total paths | 1860 | 1940 |
65 | | Total crashes | 1 (1 unique) | 1 (1 unique) |
66 | 
67 | 
68 | Here are the statistics from the example single run:
69 | 
70 | |![Fuzzing with persistent mode only](afl-fiow-stats.png)| 
71 | |:--:| 
72 | | *Image 1. Fuzzing with persistent mode + libfiowrapper* |
73 | 
74 | |![Fuzzing with persistent mode + libfiowrapper](afl-pers-stats.png)| 
75 | |:--:| 
76 | | *Image 2. Fuzzing with persistent mode only - stats* |
77 | 
78 | 
79 | The tests were performed inside docker container running Linux 4.19.76-linuxkit #1 SMP x86_64
80 | 


--------------------------------------------------------------------------------
/examples/libpng/readpng.h:
--------------------------------------------------------------------------------
 1 | /*---------------------------------------------------------------------------
 2 | 
 3 |    rpng - simple PNG display program                              readpng.h
 4 | 
 5 |   ---------------------------------------------------------------------------
 6 | 
 7 |       Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
 8 | 
 9 |       This software is provided "as is," without warranty of any kind,
10 |       express or implied.  In no event shall the author or contributors
11 |       be held liable for any damages arising in any way from the use of
12 |       this software.
13 | 
14 |       The contents of this file are DUAL-LICENSED.  You may modify and/or
15 |       redistribute this software according to the terms of one of the
16 |       following two licenses (at your option):
17 | 
18 | 
19 |       LICENSE 1 ("BSD-like with advertising clause"):
20 | 
21 |       Permission is granted to anyone to use this software for any purpose,
22 |       including commercial applications, and to alter it and redistribute
23 |       it freely, subject to the following restrictions:
24 | 
25 |       1. Redistributions of source code must retain the above copyright
26 |          notice, disclaimer, and this list of conditions.
27 |       2. Redistributions in binary form must reproduce the above copyright
28 |          notice, disclaimer, and this list of conditions in the documenta-
29 |          tion and/or other materials provided with the distribution.
30 |       3. All advertising materials mentioning features or use of this
31 |          software must display the following acknowledgment:
32 | 
33 |             This product includes software developed by Greg Roelofs
34 |             and contributors for the book, "PNG: The Definitive Guide,"
35 |             published by O'Reilly and Associates.
36 | 
37 | 
38 |       LICENSE 2 (GNU GPL v2 or later):
39 | 
40 |       This program is free software; you can redistribute it and/or modify
41 |       it under the terms of the GNU General Public License as published by
42 |       the Free Software Foundation; either version 2 of the License, or
43 |       (at your option) any later version.
44 | 
45 |       This program is distributed in the hope that it will be useful,
46 |       but WITHOUT ANY WARRANTY; without even the implied warranty of
47 |       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
48 |       GNU General Public License for more details.
49 | 
50 |       You should have received a copy of the GNU General Public License
51 |       along with this program; if not, write to the Free Software Foundation,
52 |       Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
53 | 
54 |   ---------------------------------------------------------------------------*/
55 | 
56 | #ifndef TRUE
57 | #  define TRUE 1
58 | #  define FALSE 0
59 | #endif
60 | 
61 | #ifndef MAX
62 | #  define MAX(a,b)  ((a) > (b)? (a) : (b))
63 | #  define MIN(a,b)  ((a) < (b)? (a) : (b))
64 | #endif
65 | 
66 | #ifdef DEBUG
67 | #  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
68 | #else
69 | #  define Trace(x)  ;
70 | #endif
71 | 
72 | typedef unsigned char   uch;
73 | typedef unsigned short  ush;
74 | typedef unsigned long   ulg;
75 | 
76 | 
77 | /* prototypes for public functions in readpng.c */
78 | 
79 | void readpng_version_info(void);
80 | 
81 | int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
82 | 
83 | int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
84 | 
85 | uch *readpng_get_image(double display_exponent, int *pChannels,
86 |                        ulg *pRowbytes);
87 | 
88 | void readpng_cleanup(int free_image_data);
89 | 


--------------------------------------------------------------------------------
/examples/demo/demo-app-posix.c:
--------------------------------------------------------------------------------
  1 | /*
  2 |    american fuzzy lop++ - persistent mode example
  3 |    --------------------------------------------
  4 | 
  5 |    Originally written by Michal Zalewski
  6 | 
  7 |    Copyright 2015 Google Inc. All rights reserved.
  8 | 
  9 |    Modifed: Marek Zmysłowski
 10 |    Copyright: 2020
 11 | 
 12 |    Licensed under the Apache License, Version 2.0 (the "License");
 13 |    you may not use this file except in compliance with the License.
 14 |    You may obtain a copy of the License at:
 15 | 
 16 |      http://www.apache.org/licenses/LICENSE-2.0
 17 | 
 18 |    This file demonstrates the high-performance "persistent mode" that may be
 19 |    suitable for fuzzing certain fast and well-behaved libraries, provided that
 20 |    they are stateless or that their internal state can be easily reset
 21 |    across runs.
 22 | 
 23 |    To make this work, the library and this shim need to be compiled in LLVM
 24 |    mode using afl-clang-fast (other compiler wrappers will *not* work).
 25 | 
 26 |  */
 27 | 
 28 | 
 29 | #include <stdio.h>
 30 | #include <stdlib.h>
 31 | #include <signal.h>
 32 | #include <string.h>
 33 | #include <sys/types.h>
 34 | #include <sys/stat.h>
 35 | #include <fcntl.h>
 36 | #include <unistd.h>
 37 | 
 38 | #ifdef AFL_MEMORY
 39 | __AFL_FUZZ_INIT();
 40 | extern void set_memory_size(ssize_t size);
 41 | extern void set_memory_ptr(unsigned char *buffer);
 42 | #endif
 43 | 
 44 | 
 45 | 
 46 | /* Main entry point. */
 47 | 
 48 | int main(int argc, char **argv) {
 49 | 
 50 |   ssize_t        len;                        /* how much input did we read? */
 51 |   unsigned char  *buf;                        /* test case buffer pointer    */
 52 |   int            file;
 53 |   char           byte;
 54 | 
 55 |   /* The number passed to __AFL_LOOP() controls the maximum number of
 56 |      iterations before the loop exits and the program is allowed to
 57 |      terminate normally. This limits the impact of accidental memory leaks
 58 |      and similar hiccups. */
 59 | #ifdef AFL_MEMORY
 60 |     // Set the memory pointer inside library.
 61 |     set_memory_ptr(__AFL_FUZZ_TESTCASE_BUF);
 62 | 
 63 | 
 64 |   while (__AFL_LOOP(1000)) {
 65 |     // Set the file size.
 66 |     set_memory_size(__AFL_FUZZ_TESTCASE_LEN);
 67 | #endif
 68 | #ifdef AFL_PERSISTENT
 69 |   __AFL_INIT();
 70 |   while (__AFL_LOOP(1000)) {
 71 | #endif
 72 |     file = open(argv[1], O_RDONLY);
 73 |     read(file, &byte, 1);
 74 |     if (byte == 'f') {
 75 | 
 76 |       printf("one\n");
 77 |       read(file, &byte, 1);
 78 |       if (byte  == 'o') {
 79 | 
 80 |         printf("two\n");
 81 |         read(file, &byte, 1);
 82 |         if (byte  == 'o') {
 83 | 
 84 |           printf("three\n");
 85 |           read(file, &byte, 1);
 86 |           if (byte  == '!') {
 87 | 
 88 |             printf("four\n");
 89 |             read(file, &byte, 1);
 90 |             if (byte  == '!') {
 91 | 
 92 |               printf("five\n");
 93 |               read(file, &byte, 1);
 94 |               if (byte  == '!') {
 95 | 
 96 |                 printf("six\n");
 97 |                 abort();
 98 | 
 99 |               }
100 | 
101 |             }
102 | 
103 |           }
104 | 
105 |         }
106 | 
107 |       }
108 | 
109 |     }
110 |     close(file);
111 |     /*** END PLACEHOLDER CODE ***/
112 | #if defined AFL_MEMORY || defined AFL_PERSISTENT
113 |   }
114 | #endif
115 |   /* Once the loop is exited, terminate normally - AFL will restart the process
116 |      when this happens, with a clean slate when it comes to allocated memory,
117 |      leftover file descriptors, etc. */
118 | 
119 |   return 0;
120 | 
121 | }
122 | 
123 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
  1 | # libfiowrapper
  2 | 
  3 | This library was created to help fuzzing application that are reading data from the file. It hooks file calls and replaces it with memory access.
  4 | 
  5 | Two libraries are available:
  6 | 
  7 | libfioinfo.so - this library just collects the statistics of different file calls that are used in the application
  8 | 
  9 | libfiowrapper.so - this library is used to replace file function calls with just memory access.
 10 | 
 11 | ## Building
 12 | To build just run:
 13 | ```
 14 | make
 15 | ```
 16 | 
 17 | To display more information build debug version:
 18 | ```
 19 | make debug
 20 | ```
 21 | 
 22 | The demo applications are available inside the ```./examples``` directory. To build them just run:
 23 | ```
 24 | cd ./examples/demo
 25 | make
 26 | ```
 27 | 
 28 | ## Running Demo Apps
 29 | The examples\demo directory, after build, will containe 3 application:
 30 | - info-demo - this application is just compailed with the clang. 
 31 | - file-fuzz-demo, file-fuzz-demo-posix - these applications are compiled with afl-clang-fast. They can be used to run fuzzing with simple input file.
 32 | - per-fuzz-demo, per-fuzz-demo-posix - these applications are compiled with the persistent mode.
 33 | - mem-fuzz-demo, mem-fuzz-demo-posix - these applicaitons are compiled with persistend mode with shared memory the libfiowrapper - it hooks all the f* stdio and posix file functions.
 34 | 
 35 | Bellow commands needs to be run from the examples/demo directory.
 36 | 
 37 | To collect information:
 38 | ```
 39 | LD_PRELOAD=../../libfioinfo.so ./info-demo ./input/sample
 40 | ===========================================
 41 |                 libfioinfo
 42 | Version: 0.3
 43 | Author: Marek Zmysłowski
 44 | ===========================================
 45 | 
 46 | one
 47 | two
 48 | three
 49 | ===========================================
 50 |         File calls statistics:
 51 | fopen:  1
 52 | fwrite: 0 - unlocked: 0
 53 | fputc:  0 - unlocked: 0
 54 | fputs:  0 - unlocked: 0
 55 | fread:  0 - unlocked: 0
 56 | fgetc:  4 - unlocked: 0
 57 | fgets:  0 - unlocked: 0
 58 | fseek:  0
 59 | ftell:  0
 60 | fclose: 1
 61 | 
 62 | open:   0
 63 | read:   0
 64 | write:  0
 65 | lseek:  0
 66 | close:  0
 67 | ===========================================
 68 | 
 69 | ```
 70 | 
 71 | For the regular fuzzing with files run the file-fuzz-demo:
 72 | ```
 73 | afl-fuzz -i ./input -o ./output -- ./file-fuzz-demo @@
 74 | ```
 75 | 
 76 | For the persistent fuzzing run the per-fuzz-demo:
 77 | ```
 78 | afl-fuzz -i ./input -o ./output -- ./per-fuzz-demo @@
 79 | ```
 80 | For the persistent fuzzing with shared memory first the LD_LIBRARY_PATH needs to be set for the directory where the libfiowrapper.so is located.
 81 | ```
 82 | export LD_LIBRARY_PATH=../../
 83 | afl-fuzz -i ./input -o ./output -- ./mem-fuzz-demo @@
 84 | ```
 85 | ## Modifing code
 86 | The code needs to be modify by adding few calls from the library. Just after __AFL_FUZZ_INIT add two function declarations:
 87 | ```
 88 | __AFL_FUZZ_INIT();
 89 | #ifdef __cplusplus
 90 | extern "C" void set_memory_size(ssize_t size);
 91 | extern "C" void set_memory_ptr(unsigned char *buffer);
 92 | #else
 93 | extern void set_memory_size(ssize_t size);
 94 | extern void set_memory_ptr(unsigned char *buffer);
 95 | #endif
 96 | ```
 97 | 
 98 | Before the AFL loop initialize the memory pointer:
 99 | ```
100 | set_memory_ptr(__AFL_FUZZ_TESTCASE_BUF);
101 | ```
102 | 
103 | Each iteration, the size needs to be set:
104 | ```
105 |   while (__AFL_LOOP(1000)) {
106 |     // Set the file size.
107 |     set_memory_size(__AFL_FUZZ_TESTCASE_LEN);
108 | ```
109 | ## Real Live Example 
110 | ### libpng
111 | To build libpng as an example please read [examples/libpng/README.md](examples/libpng)
112 | 
113 | ## Questions and Feedback
114 | If you have any questions or feedback, please send me an email to marekzmyslowski@poczta.onet.pl
115 | 


--------------------------------------------------------------------------------
/examples/libpng/readpng.c:
--------------------------------------------------------------------------------
  1 | /*---------------------------------------------------------------------------
  2 | 
  3 |    rpng - simple PNG display program                              readpng.c
  4 | 
  5 |   ---------------------------------------------------------------------------
  6 | 
  7 |       Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
  8 | 
  9 |       This software is provided "as is," without warranty of any kind,
 10 |       express or implied.  In no event shall the author or contributors
 11 |       be held liable for any damages arising in any way from the use of
 12 |       this software.
 13 | 
 14 |       The contents of this file are DUAL-LICENSED.  You may modify and/or
 15 |       redistribute this software according to the terms of one of the
 16 |       following two licenses (at your option):
 17 | 
 18 | 
 19 |       LICENSE 1 ("BSD-like with advertising clause"):
 20 | 
 21 |       Permission is granted to anyone to use this software for any purpose,
 22 |       including commercial applications, and to alter it and redistribute
 23 |       it freely, subject to the following restrictions:
 24 | 
 25 |       1. Redistributions of source code must retain the above copyright
 26 |          notice, disclaimer, and this list of conditions.
 27 |       2. Redistributions in binary form must reproduce the above copyright
 28 |          notice, disclaimer, and this list of conditions in the documenta-
 29 |          tion and/or other materials provided with the distribution.
 30 |       3. All advertising materials mentioning features or use of this
 31 |          software must display the following acknowledgment:
 32 | 
 33 |             This product includes software developed by Greg Roelofs
 34 |             and contributors for the book, "PNG: The Definitive Guide,"
 35 |             published by O'Reilly and Associates.
 36 | 
 37 | 
 38 |       LICENSE 2 (GNU GPL v2 or later):
 39 | 
 40 |       This program is free software; you can redistribute it and/or modify
 41 |       it under the terms of the GNU General Public License as published by
 42 |       the Free Software Foundation; either version 2 of the License, or
 43 |       (at your option) any later version.
 44 | 
 45 |       This program is distributed in the hope that it will be useful,
 46 |       but WITHOUT ANY WARRANTY; without even the implied warranty of
 47 |       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 48 |       GNU General Public License for more details.
 49 | 
 50 |       You should have received a copy of the GNU General Public License
 51 |       along with this program; if not, write to the Free Software Foundation,
 52 |       Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 53 | 
 54 |   ---------------------------------------------------------------------------*/
 55 |   /*
 56 |    * Modified by: Marek Zmysłowski
 57 |    * Copyrights: 2020
 58 |    */
 59 | 
 60 | #include <stdio.h>
 61 | #include <stdlib.h>
 62 | 
 63 | #include <zlib.h>
 64 | 
 65 | #include "png.h"        /* libpng header; includes zlib.h */
 66 | #include "readpng.h"    /* typedefs, common macros, public prototypes */
 67 | 
 68 | /* future versions of libpng will provide this macro: */
 69 | #ifndef png_jmpbuf
 70 | #  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
 71 | #endif
 72 | 
 73 | 
 74 | static png_structp png_ptr = NULL;
 75 | static png_infop info_ptr = NULL;
 76 | 
 77 | png_uint_32  width, height;
 78 | int  bit_depth, color_type;
 79 | uch  *image_data = NULL;
 80 | 
 81 | 
 82 | void readpng_version_info(void)
 83 | {
 84 |     fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
 85 |       PNG_LIBPNG_VER_STRING, png_libpng_ver);
 86 |     fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
 87 |       ZLIB_VERSION, zlib_version);
 88 | }
 89 | 
 90 | 
 91 | /* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
 92 | 
 93 | int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
 94 | {
 95 |     uch sig[8];
 96 | 
 97 | 
 98 |     /* first do a quick check that the file really is a PNG image; could
 99 |      * have used slightly more general png_sig_cmp() function instead */
100 | 
101 |     fread(sig, 1, 8, infile);
102 |     if (!png_check_sig(sig, 8))
103 |         return 1;   /* bad signature */
104 | 
105 | 
106 |     /* could pass pointers to user-defined error handlers instead of NULLs: */
107 | 
108 |     png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
109 |     if (!png_ptr)
110 |         return 4;   /* out of memory */
111 | 
112 |     info_ptr = png_create_info_struct(png_ptr);
113 |     if (!info_ptr) {
114 |         png_destroy_read_struct(&png_ptr, NULL, NULL);
115 |         return 4;   /* out of memory */
116 |     }
117 | 
118 | 
119 |     /* we could create a second info struct here (end_info), but it's only
120 |      * useful if we want to keep pre- and post-IDAT chunk info separated
121 |      * (mainly for PNG-aware image editors and converters) */
122 | 
123 | 
124 |     /* setjmp() must be called in every function that calls a PNG-reading
125 |      * libpng function */
126 | 
127 |     if (setjmp(png_jmpbuf(png_ptr))) {
128 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
129 |         return 2;
130 |     }
131 | 
132 | 
133 |     png_init_io(png_ptr, infile);
134 |     png_set_sig_bytes(png_ptr, 8);  /* we already read the 8 signature bytes */
135 | 
136 |     png_read_info(png_ptr, info_ptr);  /* read all PNG info up to image data */
137 | 
138 | 
139 |     /* alternatively, could make separate calls to png_get_image_width(),
140 |      * etc., but want bit_depth and color_type for later [don't care about
141 |      * compression_type and filter_type => NULLs] */
142 | 
143 |     png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
144 |       NULL, NULL, NULL);
145 |     *pWidth = width;
146 |     *pHeight = height;
147 | 
148 | 
149 |     /* OK, that's all we need for now; return happy */
150 | 
151 |     return 0;
152 | }
153 | 
154 | 
155 | 
156 | 
157 | /* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
158 |  * scales values to 8-bit if necessary */
159 | 
160 | int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
161 | {
162 |     png_color_16p pBackground;
163 | 
164 | 
165 |     /* setjmp() must be called in every function that calls a PNG-reading
166 |      * libpng function */
167 | 
168 |     if (setjmp(png_jmpbuf(png_ptr))) {
169 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
170 |         return 2;
171 |     }
172 | 
173 | 
174 |     if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))
175 |         return 1;
176 | 
177 |     /* it is not obvious from the libpng documentation, but this function
178 |      * takes a pointer to a pointer, and it always returns valid red, green
179 |      * and blue values, regardless of color_type: */
180 | 
181 |     png_get_bKGD(png_ptr, info_ptr, &pBackground);
182 | 
183 | 
184 |     /* however, it always returns the raw bKGD data, regardless of any
185 |      * bit-depth transformations, so check depth and adjust if necessary */
186 | 
187 |     if (bit_depth == 16) {
188 |         *red   = pBackground->red   >> 8;
189 |         *green = pBackground->green >> 8;
190 |         *blue  = pBackground->blue  >> 8;
191 |     } else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
192 |         if (bit_depth == 1)
193 |             *red = *green = *blue = pBackground->gray? 255 : 0;
194 |         else if (bit_depth == 2)
195 |             *red = *green = *blue = (255/3) * pBackground->gray;
196 |         else /* bit_depth == 4 */
197 |             *red = *green = *blue = (255/15) * pBackground->gray;
198 |     } else {
199 |         *red   = (uch)pBackground->red;
200 |         *green = (uch)pBackground->green;
201 |         *blue  = (uch)pBackground->blue;
202 |     }
203 | 
204 |     return 0;
205 | }
206 | 
207 | 
208 | 
209 | 
210 | /* display_exponent == LUT_exponent * CRT_exponent */
211 | 
212 | uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
213 | {
214 |     double  gamma;
215 |     png_uint_32  i, rowbytes;
216 |     png_bytepp  row_pointers = NULL;
217 | 
218 | 
219 |     /* setjmp() must be called in every function that calls a PNG-reading
220 |      * libpng function */
221 | 
222 |     if (setjmp(png_jmpbuf(png_ptr))) {
223 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
224 |         return NULL;
225 |     }
226 | 
227 | 
228 |     /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
229 |      * transparency chunks to full alpha channel; strip 16-bit-per-sample
230 |      * images to 8 bits per sample; and convert grayscale to RGB[A] */
231 | 
232 |     if (color_type == PNG_COLOR_TYPE_PALETTE)
233 |         png_set_expand(png_ptr);
234 |     if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
235 |         png_set_expand(png_ptr);
236 |     if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
237 |         png_set_expand(png_ptr);
238 |     if (bit_depth == 16)
239 |         png_set_strip_16(png_ptr);
240 |     if (color_type == PNG_COLOR_TYPE_GRAY ||
241 |         color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
242 |         png_set_gray_to_rgb(png_ptr);
243 | 
244 | 
245 |     /* unlike the example in the libpng documentation, we have *no* idea where
246 |      * this file may have come from--so if it doesn't have a file gamma, don't
247 |      * do any correction ("do no harm") */
248 | 
249 |     if (png_get_gAMA(png_ptr, info_ptr, &gamma))
250 |         png_set_gamma(png_ptr, display_exponent, gamma);
251 | 
252 | 
253 |     /* all transformations have been registered; now update info_ptr data,
254 |      * get rowbytes and channels, and allocate image memory */
255 | 
256 |     png_read_update_info(png_ptr, info_ptr);
257 | 
258 |     *pRowbytes = rowbytes = png_get_rowbytes(png_ptr, info_ptr);
259 |     *pChannels = (int)png_get_channels(png_ptr, info_ptr);
260 | 
261 |     if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
262 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
263 |         return NULL;
264 |     }
265 |     if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL) {
266 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
267 |         free(image_data);
268 |         image_data = NULL;
269 |         return NULL;
270 |     }
271 | 
272 |     Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n", *pChannels, rowbytes, height));
273 | 
274 | 
275 |     /* set the individual row_pointers to point at the correct offsets */
276 | 
277 |     for (i = 0;  i < height;  ++i)
278 |         row_pointers[i] = image_data + i*rowbytes;
279 | 
280 | 
281 |     /* now we can go ahead and just read the whole image */
282 | 
283 |     png_read_image(png_ptr, row_pointers);
284 | 
285 | 
286 |     /* and we're done!  (png_read_end() can be omitted if no processing of
287 |      * post-IDAT text/time/etc. is desired) */
288 | 
289 |     free(row_pointers);
290 |     row_pointers = NULL;
291 | 
292 |     png_read_end(png_ptr, NULL);
293 | 
294 |     return image_data;
295 | }
296 | 
297 | 
298 | void readpng_cleanup(int free_image_data)
299 | {
300 |     if (free_image_data && image_data) {
301 |         free(image_data);
302 |         image_data = NULL;
303 |     }
304 | 
305 |     if (png_ptr && info_ptr) {
306 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
307 |         png_ptr = NULL;
308 |         info_ptr = NULL;
309 |     }
310 | }
311 | 
312 | int main(int argc, char *argv[])
313 | {
314 |     FILE *infile;
315 |     unsigned long h,w;
316 |     uch red, green, blue;
317 |     int pChannels;
318 |     ulg pRowbytes;
319 |         image_data = NULL;
320 |         infile = fopen(argv[1], "r");
321 |         if (!readpng_init(infile, &w, &h)) {
322 |             readpng_get_bgcolor(&red, &green, &blue);
323 |             image_data = readpng_get_image((2.2*1.0), &pChannels, &pRowbytes);
324 |             readpng_cleanup(1);
325 |         }
326 |         fclose(infile);
327 | }
328 | 


--------------------------------------------------------------------------------
/examples/libpng/readpng-pers.c:
--------------------------------------------------------------------------------
  1 | /*---------------------------------------------------------------------------
  2 | 
  3 |    rpng - simple PNG display program                              readpng.c
  4 | 
  5 |   ---------------------------------------------------------------------------
  6 | 
  7 |       Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
  8 | 
  9 |       This software is provided "as is," without warranty of any kind,
 10 |       express or implied.  In no event shall the author or contributors
 11 |       be held liable for any damages arising in any way from the use of
 12 |       this software.
 13 | 
 14 |       The contents of this file are DUAL-LICENSED.  You may modify and/or
 15 |       redistribute this software according to the terms of one of the
 16 |       following two licenses (at your option):
 17 | 
 18 | 
 19 |       LICENSE 1 ("BSD-like with advertising clause"):
 20 | 
 21 |       Permission is granted to anyone to use this software for any purpose,
 22 |       including commercial applications, and to alter it and redistribute
 23 |       it freely, subject to the following restrictions:
 24 | 
 25 |       1. Redistributions of source code must retain the above copyright
 26 |          notice, disclaimer, and this list of conditions.
 27 |       2. Redistributions in binary form must reproduce the above copyright
 28 |          notice, disclaimer, and this list of conditions in the documenta-
 29 |          tion and/or other materials provided with the distribution.
 30 |       3. All advertising materials mentioning features or use of this
 31 |          software must display the following acknowledgment:
 32 | 
 33 |             This product includes software developed by Greg Roelofs
 34 |             and contributors for the book, "PNG: The Definitive Guide,"
 35 |             published by O'Reilly and Associates.
 36 | 
 37 | 
 38 |       LICENSE 2 (GNU GPL v2 or later):
 39 | 
 40 |       This program is free software; you can redistribute it and/or modify
 41 |       it under the terms of the GNU General Public License as published by
 42 |       the Free Software Foundation; either version 2 of the License, or
 43 |       (at your option) any later version.
 44 | 
 45 |       This program is distributed in the hope that it will be useful,
 46 |       but WITHOUT ANY WARRANTY; without even the implied warranty of
 47 |       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 48 |       GNU General Public License for more details.
 49 | 
 50 |       You should have received a copy of the GNU General Public License
 51 |       along with this program; if not, write to the Free Software Foundation,
 52 |       Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 53 | 
 54 |   ---------------------------------------------------------------------------*/
 55 |   /*
 56 |    * Modified by: Marek Zmysłowski
 57 |    * Copyrights: 2020
 58 |    * This file contains code to be fuzzed in persistent mode.
 59 |    */
 60 | 
 61 | #include <stdio.h>
 62 | #include <stdlib.h>
 63 | 
 64 | #include <zlib.h>
 65 | 
 66 | #include "png.h"        /* libpng header; includes zlib.h */
 67 | #include "readpng.h"    /* typedefs, common macros, public prototypes */
 68 | 
 69 | /* future versions of libpng will provide this macro: */
 70 | #ifndef png_jmpbuf
 71 | #  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
 72 | #endif
 73 | 
 74 | 
 75 | static png_structp png_ptr = NULL;
 76 | static png_infop info_ptr = NULL;
 77 | 
 78 | png_uint_32  width, height;
 79 | int  bit_depth, color_type;
 80 | uch  *image_data = NULL;
 81 | 
 82 | 
 83 | void readpng_version_info(void)
 84 | {
 85 |     fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
 86 |       PNG_LIBPNG_VER_STRING, png_libpng_ver);
 87 |     fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
 88 |       ZLIB_VERSION, zlib_version);
 89 | }
 90 | 
 91 | 
 92 | /* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
 93 | 
 94 | int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
 95 | {
 96 |     uch sig[8];
 97 | 
 98 | 
 99 |     /* first do a quick check that the file really is a PNG image; could
100 |      * have used slightly more general png_sig_cmp() function instead */
101 | 
102 |     fread(sig, 1, 8, infile);
103 |     if (!png_check_sig(sig, 8))
104 |         return 1;   /* bad signature */
105 | 
106 | 
107 |     /* could pass pointers to user-defined error handlers instead of NULLs: */
108 | 
109 |     png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
110 |     if (!png_ptr)
111 |         return 4;   /* out of memory */
112 | 
113 |     info_ptr = png_create_info_struct(png_ptr);
114 |     if (!info_ptr) {
115 |         png_destroy_read_struct(&png_ptr, NULL, NULL);
116 |         return 4;   /* out of memory */
117 |     }
118 | 
119 | 
120 |     /* we could create a second info struct here (end_info), but it's only
121 |      * useful if we want to keep pre- and post-IDAT chunk info separated
122 |      * (mainly for PNG-aware image editors and converters) */
123 | 
124 | 
125 |     /* setjmp() must be called in every function that calls a PNG-reading
126 |      * libpng function */
127 | 
128 |     if (setjmp(png_jmpbuf(png_ptr))) {
129 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
130 |         return 2;
131 |     }
132 | 
133 | 
134 |     png_init_io(png_ptr, infile);
135 |     png_set_sig_bytes(png_ptr, 8);  /* we already read the 8 signature bytes */
136 | 
137 |     png_read_info(png_ptr, info_ptr);  /* read all PNG info up to image data */
138 | 
139 | 
140 |     /* alternatively, could make separate calls to png_get_image_width(),
141 |      * etc., but want bit_depth and color_type for later [don't care about
142 |      * compression_type and filter_type => NULLs] */
143 | 
144 |     png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
145 |       NULL, NULL, NULL);
146 |     *pWidth = width;
147 |     *pHeight = height;
148 | 
149 | 
150 |     /* OK, that's all we need for now; return happy */
151 | 
152 |     return 0;
153 | }
154 | 
155 | 
156 | 
157 | 
158 | /* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
159 |  * scales values to 8-bit if necessary */
160 | 
161 | int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
162 | {
163 |     png_color_16p pBackground;
164 | 
165 | 
166 |     /* setjmp() must be called in every function that calls a PNG-reading
167 |      * libpng function */
168 | 
169 |     if (setjmp(png_jmpbuf(png_ptr))) {
170 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
171 |         return 2;
172 |     }
173 | 
174 | 
175 |     if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))
176 |         return 1;
177 | 
178 |     /* it is not obvious from the libpng documentation, but this function
179 |      * takes a pointer to a pointer, and it always returns valid red, green
180 |      * and blue values, regardless of color_type: */
181 | 
182 |     png_get_bKGD(png_ptr, info_ptr, &pBackground);
183 | 
184 | 
185 |     /* however, it always returns the raw bKGD data, regardless of any
186 |      * bit-depth transformations, so check depth and adjust if necessary */
187 | 
188 |     if (bit_depth == 16) {
189 |         *red   = pBackground->red   >> 8;
190 |         *green = pBackground->green >> 8;
191 |         *blue  = pBackground->blue  >> 8;
192 |     } else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
193 |         if (bit_depth == 1)
194 |             *red = *green = *blue = pBackground->gray? 255 : 0;
195 |         else if (bit_depth == 2)
196 |             *red = *green = *blue = (255/3) * pBackground->gray;
197 |         else /* bit_depth == 4 */
198 |             *red = *green = *blue = (255/15) * pBackground->gray;
199 |     } else {
200 |         *red   = (uch)pBackground->red;
201 |         *green = (uch)pBackground->green;
202 |         *blue  = (uch)pBackground->blue;
203 |     }
204 | 
205 |     return 0;
206 | }
207 | 
208 | 
209 | 
210 | 
211 | /* display_exponent == LUT_exponent * CRT_exponent */
212 | 
213 | uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
214 | {
215 |     double  gamma;
216 |     png_uint_32  i, rowbytes;
217 |     png_bytepp  row_pointers = NULL;
218 | 
219 | 
220 |     /* setjmp() must be called in every function that calls a PNG-reading
221 |      * libpng function */
222 | 
223 |     if (setjmp(png_jmpbuf(png_ptr))) {
224 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
225 |         return NULL;
226 |     }
227 | 
228 | 
229 |     /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
230 |      * transparency chunks to full alpha channel; strip 16-bit-per-sample
231 |      * images to 8 bits per sample; and convert grayscale to RGB[A] */
232 | 
233 |     if (color_type == PNG_COLOR_TYPE_PALETTE)
234 |         png_set_expand(png_ptr);
235 |     if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
236 |         png_set_expand(png_ptr);
237 |     if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
238 |         png_set_expand(png_ptr);
239 |     if (bit_depth == 16)
240 |         png_set_strip_16(png_ptr);
241 |     if (color_type == PNG_COLOR_TYPE_GRAY ||
242 |         color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
243 |         png_set_gray_to_rgb(png_ptr);
244 | 
245 | 
246 |     /* unlike the example in the libpng documentation, we have *no* idea where
247 |      * this file may have come from--so if it doesn't have a file gamma, don't
248 |      * do any correction ("do no harm") */
249 | 
250 |     if (png_get_gAMA(png_ptr, info_ptr, &gamma))
251 |         png_set_gamma(png_ptr, display_exponent, gamma);
252 | 
253 | 
254 |     /* all transformations have been registered; now update info_ptr data,
255 |      * get rowbytes and channels, and allocate image memory */
256 | 
257 |     png_read_update_info(png_ptr, info_ptr);
258 | 
259 |     *pRowbytes = rowbytes = png_get_rowbytes(png_ptr, info_ptr);
260 |     *pChannels = (int)png_get_channels(png_ptr, info_ptr);
261 | 
262 |     if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
263 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
264 |         return NULL;
265 |     }
266 |     if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL) {
267 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
268 |         free(image_data);
269 |         image_data = NULL;
270 |         return NULL;
271 |     }
272 | 
273 |     Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n", *pChannels, rowbytes, height));
274 | 
275 | 
276 |     /* set the individual row_pointers to point at the correct offsets */
277 | 
278 |     for (i = 0;  i < height;  ++i)
279 |         row_pointers[i] = image_data + i*rowbytes;
280 | 
281 | 
282 |     /* now we can go ahead and just read the whole image */
283 | 
284 |     png_read_image(png_ptr, row_pointers);
285 | 
286 | 
287 |     /* and we're done!  (png_read_end() can be omitted if no processing of
288 |      * post-IDAT text/time/etc. is desired) */
289 | 
290 |     free(row_pointers);
291 |     row_pointers = NULL;
292 | 
293 |     png_read_end(png_ptr, NULL);
294 | 
295 |     return image_data;
296 | }
297 | 
298 | 
299 | void readpng_cleanup(int free_image_data)
300 | {
301 |     if (free_image_data && image_data) {
302 |         free(image_data);
303 |         image_data = NULL;
304 |     }
305 | 
306 |     if (png_ptr && info_ptr) {
307 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
308 |         png_ptr = NULL;
309 |         info_ptr = NULL;
310 |     }
311 | }
312 | 
313 | int main(int argc, char *argv[])
314 | {
315 |     FILE *infile;
316 |     unsigned long h,w;
317 |     uch red, green, blue;
318 |     int pChannels;
319 |     ulg pRowbytes;
320 |     while (__AFL_LOOP(65535))
321 |     {
322 |         image_data = NULL;
323 |         infile = fopen(argv[1], "r");
324 |         if (!readpng_init(infile, &w, &h)) {
325 |             readpng_get_bgcolor(&red, &green, &blue);
326 |             image_data = readpng_get_image((2.2*1.0), &pChannels, &pRowbytes);
327 |             readpng_cleanup(1);
328 |         }
329 |         fclose(infile);
330 |     }
331 | }
332 | 


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--------------------------------------------------------------------------------
/examples/libpng/readpng-fiow.c:
--------------------------------------------------------------------------------
  1 | /*---------------------------------------------------------------------------
  2 | 
  3 |    rpng - simple PNG display program                              readpng.c
  4 | 
  5 |   ---------------------------------------------------------------------------
  6 | 
  7 |       Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
  8 | 
  9 |       This software is provided "as is," without warranty of any kind,
 10 |       express or implied.  In no event shall the author or contributors
 11 |       be held liable for any damages arising in any way from the use of
 12 |       this software.
 13 | 
 14 |       The contents of this file are DUAL-LICENSED.  You may modify and/or
 15 |       redistribute this software according to the terms of one of the
 16 |       following two licenses (at your option):
 17 | 
 18 | 
 19 |       LICENSE 1 ("BSD-like with advertising clause"):
 20 | 
 21 |       Permission is granted to anyone to use this software for any purpose,
 22 |       including commercial applications, and to alter it and redistribute
 23 |       it freely, subject to the following restrictions:
 24 | 
 25 |       1. Redistributions of source code must retain the above copyright
 26 |          notice, disclaimer, and this list of conditions.
 27 |       2. Redistributions in binary form must reproduce the above copyright
 28 |          notice, disclaimer, and this list of conditions in the documenta-
 29 |          tion and/or other materials provided with the distribution.
 30 |       3. All advertising materials mentioning features or use of this
 31 |          software must display the following acknowledgment:
 32 | 
 33 |             This product includes software developed by Greg Roelofs
 34 |             and contributors for the book, "PNG: The Definitive Guide,"
 35 |             published by O'Reilly and Associates.
 36 | 
 37 | 
 38 |       LICENSE 2 (GNU GPL v2 or later):
 39 | 
 40 |       This program is free software; you can redistribute it and/or modify
 41 |       it under the terms of the GNU General Public License as published by
 42 |       the Free Software Foundation; either version 2 of the License, or
 43 |       (at your option) any later version.
 44 | 
 45 |       This program is distributed in the hope that it will be useful,
 46 |       but WITHOUT ANY WARRANTY; without even the implied warranty of
 47 |       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 48 |       GNU General Public License for more details.
 49 | 
 50 |       You should have received a copy of the GNU General Public License
 51 |       along with this program; if not, write to the Free Software Foundation,
 52 |       Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 53 | 
 54 |   ---------------------------------------------------------------------------*/
 55 |   /*
 56 |    * Modified by: Marek Zmysłowski
 57 |    * Copyrights: 2020
 58 |    * This file contains code to be fuzzed in persistent mode with libfiowrapper.
 59 |    */
 60 | 
 61 | #include <stdio.h>
 62 | #include <stdlib.h>
 63 | 
 64 | #include <zlib.h>
 65 | 
 66 | #include "png.h"        /* libpng header; includes zlib.h */
 67 | #include "readpng.h"    /* typedefs, common macros, public prototypes */
 68 | 
 69 | __AFL_FUZZ_INIT();
 70 | extern void set_memory_size(ssize_t size);
 71 | extern void set_memory_ptr(unsigned char *buffer);
 72 | 
 73 | /* future versions of libpng will provide this macro: */
 74 | #ifndef png_jmpbuf
 75 | #  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
 76 | #endif
 77 | 
 78 | 
 79 | static png_structp png_ptr = NULL;
 80 | static png_infop info_ptr = NULL;
 81 | 
 82 | png_uint_32  width, height;
 83 | int  bit_depth, color_type;
 84 | uch  *image_data = NULL;
 85 | 
 86 | 
 87 | void readpng_version_info(void)
 88 | {
 89 |     fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
 90 |       PNG_LIBPNG_VER_STRING, png_libpng_ver);
 91 |     fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
 92 |       ZLIB_VERSION, zlib_version);
 93 | }
 94 | 
 95 | 
 96 | /* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
 97 | 
 98 | int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
 99 | {
100 |     uch sig[8];
101 | 
102 | 
103 |     /* first do a quick check that the file really is a PNG image; could
104 |      * have used slightly more general png_sig_cmp() function instead */
105 | 
106 |     fread(sig, 1, 8, infile);
107 |     if (!png_check_sig(sig, 8))
108 |         return 1;   /* bad signature */
109 | 
110 | 
111 |     /* could pass pointers to user-defined error handlers instead of NULLs: */
112 | 
113 |     png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
114 |     if (!png_ptr)
115 |         return 4;   /* out of memory */
116 | 
117 |     info_ptr = png_create_info_struct(png_ptr);
118 |     if (!info_ptr) {
119 |         png_destroy_read_struct(&png_ptr, NULL, NULL);
120 |         return 4;   /* out of memory */
121 |     }
122 | 
123 | 
124 |     /* we could create a second info struct here (end_info), but it's only
125 |      * useful if we want to keep pre- and post-IDAT chunk info separated
126 |      * (mainly for PNG-aware image editors and converters) */
127 | 
128 | 
129 |     /* setjmp() must be called in every function that calls a PNG-reading
130 |      * libpng function */
131 | 
132 |     if (setjmp(png_jmpbuf(png_ptr))) {
133 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
134 |         return 2;
135 |     }
136 | 
137 | 
138 |     png_init_io(png_ptr, infile);
139 |     png_set_sig_bytes(png_ptr, 8);  /* we already read the 8 signature bytes */
140 | 
141 |     png_read_info(png_ptr, info_ptr);  /* read all PNG info up to image data */
142 | 
143 | 
144 |     /* alternatively, could make separate calls to png_get_image_width(),
145 |      * etc., but want bit_depth and color_type for later [don't care about
146 |      * compression_type and filter_type => NULLs] */
147 | 
148 |     png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
149 |       NULL, NULL, NULL);
150 |     *pWidth = width;
151 |     *pHeight = height;
152 | 
153 | 
154 |     /* OK, that's all we need for now; return happy */
155 | 
156 |     return 0;
157 | }
158 | 
159 | 
160 | 
161 | 
162 | /* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
163 |  * scales values to 8-bit if necessary */
164 | 
165 | int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
166 | {
167 |     png_color_16p pBackground;
168 | 
169 | 
170 |     /* setjmp() must be called in every function that calls a PNG-reading
171 |      * libpng function */
172 | 
173 |     if (setjmp(png_jmpbuf(png_ptr))) {
174 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
175 |         return 2;
176 |     }
177 | 
178 | 
179 |     if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))
180 |         return 1;
181 | 
182 |     /* it is not obvious from the libpng documentation, but this function
183 |      * takes a pointer to a pointer, and it always returns valid red, green
184 |      * and blue values, regardless of color_type: */
185 | 
186 |     png_get_bKGD(png_ptr, info_ptr, &pBackground);
187 | 
188 | 
189 |     /* however, it always returns the raw bKGD data, regardless of any
190 |      * bit-depth transformations, so check depth and adjust if necessary */
191 | 
192 |     if (bit_depth == 16) {
193 |         *red   = pBackground->red   >> 8;
194 |         *green = pBackground->green >> 8;
195 |         *blue  = pBackground->blue  >> 8;
196 |     } else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
197 |         if (bit_depth == 1)
198 |             *red = *green = *blue = pBackground->gray? 255 : 0;
199 |         else if (bit_depth == 2)
200 |             *red = *green = *blue = (255/3) * pBackground->gray;
201 |         else /* bit_depth == 4 */
202 |             *red = *green = *blue = (255/15) * pBackground->gray;
203 |     } else {
204 |         *red   = (uch)pBackground->red;
205 |         *green = (uch)pBackground->green;
206 |         *blue  = (uch)pBackground->blue;
207 |     }
208 | 
209 |     return 0;
210 | }
211 | 
212 | 
213 | 
214 | 
215 | /* display_exponent == LUT_exponent * CRT_exponent */
216 | 
217 | uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
218 | {
219 |     double  gamma;
220 |     png_uint_32  i, rowbytes;
221 |     png_bytepp  row_pointers = NULL;
222 | 
223 | 
224 |     /* setjmp() must be called in every function that calls a PNG-reading
225 |      * libpng function */
226 | 
227 |     if (setjmp(png_jmpbuf(png_ptr))) {
228 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
229 |         return NULL;
230 |     }
231 | 
232 | 
233 |     /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
234 |      * transparency chunks to full alpha channel; strip 16-bit-per-sample
235 |      * images to 8 bits per sample; and convert grayscale to RGB[A] */
236 | 
237 |     if (color_type == PNG_COLOR_TYPE_PALETTE)
238 |         png_set_expand(png_ptr);
239 |     if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
240 |         png_set_expand(png_ptr);
241 |     if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
242 |         png_set_expand(png_ptr);
243 |     if (bit_depth == 16)
244 |         png_set_strip_16(png_ptr);
245 |     if (color_type == PNG_COLOR_TYPE_GRAY ||
246 |         color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
247 |         png_set_gray_to_rgb(png_ptr);
248 | 
249 | 
250 |     /* unlike the example in the libpng documentation, we have *no* idea where
251 |      * this file may have come from--so if it doesn't have a file gamma, don't
252 |      * do any correction ("do no harm") */
253 | 
254 |     if (png_get_gAMA(png_ptr, info_ptr, &gamma))
255 |         png_set_gamma(png_ptr, display_exponent, gamma);
256 | 
257 | 
258 |     /* all transformations have been registered; now update info_ptr data,
259 |      * get rowbytes and channels, and allocate image memory */
260 | 
261 |     png_read_update_info(png_ptr, info_ptr);
262 | 
263 |     *pRowbytes = rowbytes = png_get_rowbytes(png_ptr, info_ptr);
264 |     *pChannels = (int)png_get_channels(png_ptr, info_ptr);
265 | 
266 |     if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
267 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
268 |         return NULL;
269 |     }
270 |     if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL) {
271 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
272 |         free(image_data);
273 |         image_data = NULL;
274 |         return NULL;
275 |     }
276 | 
277 |     Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n", *pChannels, rowbytes, height));
278 | 
279 | 
280 |     /* set the individual row_pointers to point at the correct offsets */
281 | 
282 |     for (i = 0;  i < height;  ++i)
283 |         row_pointers[i] = image_data + i*rowbytes;
284 | 
285 | 
286 |     /* now we can go ahead and just read the whole image */
287 | 
288 |     png_read_image(png_ptr, row_pointers);
289 | 
290 | 
291 |     /* and we're done!  (png_read_end() can be omitted if no processing of
292 |      * post-IDAT text/time/etc. is desired) */
293 | 
294 |     free(row_pointers);
295 |     row_pointers = NULL;
296 | 
297 |     png_read_end(png_ptr, NULL);
298 | 
299 |     return image_data;
300 | }
301 | 
302 | 
303 | void readpng_cleanup(int free_image_data)
304 | {
305 |     if (free_image_data && image_data) {
306 |         free(image_data);
307 |         image_data = NULL;
308 |     }
309 | 
310 |     if (png_ptr && info_ptr) {
311 |         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
312 |         png_ptr = NULL;
313 |         info_ptr = NULL;
314 |     }
315 | }
316 | 
317 | int main(int argc, char *argv[])
318 | {
319 |     FILE *infile;
320 |     unsigned long h,w;
321 |     uch red, green, blue;
322 |     int pChannels;
323 |     ulg pRowbytes;
324 |     // Set the memory pointer
325 |     set_memory_ptr(__AFL_FUZZ_TESTCASE_BUF);
326 |     while (__AFL_LOOP(65535))
327 |     {
328 |         // Set the file size.
329 |         set_memory_size(__AFL_FUZZ_TESTCASE_LEN);
330 |         image_data = NULL;
331 |         infile = fopen(argv[1], "r");
332 |         if (!readpng_init(infile, &w, &h)) {
333 |             readpng_get_bgcolor(&red, &green, &blue);
334 |             image_data = readpng_get_image((2.2*1.0), &pChannels, &pRowbytes);
335 |             readpng_cleanup(1);
336 |         }
337 |         fclose(infile);
338 |     }
339 | }
340 | 


--------------------------------------------------------------------------------
/libfioinfo.c:
--------------------------------------------------------------------------------
  1 | /*
  2 |  * File I/O Functions Info
  3 |  * This library provides the statistics what functions where used during the execution. 
  4 |  * 
  5 |  * Author: Marek Zmysłowski
  6 |  * Version: 0.3
  7 |  * 
  8 |  * Licensed under the Apache License, Version 2.0 (the "License");
  9 |  * you may not use this file except in compliance with the License.
 10 |  * You may obtain a copy of the License at:
 11 |  *      http://www.apache.org/licenses/LICENSE-2.0
 12 |  * This is the real deal: the program takes an instrumented binary and
 13 |  * attempts a variety of basic fuzzing tricks, paying close attention to
 14 |  * how they affect the execution path.
 15 |  * 
 16 |  */
 17 | 
 18 | #define _GNU_SOURCE
 19 | 
 20 | #include <dlfcn.h>
 21 | 
 22 | #include <stdlib.h>
 23 | #include <stdio.h>
 24 | #include "libfiodef.h"
 25 | 
 26 | //
 27 | // Variables holding statistics
 28 | //
 29 | // Standard
 30 | static int fopen_count;
 31 | static int fwrite_count;
 32 | static int fputc_count;
 33 | static int fputs_count;
 34 | static int fread_count;
 35 | static int fseek_count;
 36 | 
 37 | static int ftell_count;
 38 | static int fgetc_count;
 39 | static int fgets_count;
 40 | static int fclose_count;
 41 | 
 42 | // Nonlocking
 43 | static int fwrite_unlocked_count;
 44 | static int fputc_unlocked_count;
 45 | static int fputs_unlocked_count;
 46 | static int fread_unlocked_count;
 47 | static int fgetc_unlocked_count;
 48 | static int fgets_unlocked_count;
 49 | 
 50 | // POSIX
 51 | static int open_count;
 52 | static int read_count;
 53 | static int write_count;
 54 | static int lseek_count;
 55 | static int close_count;
 56 | 
 57 | /*
 58 |  * fopen wrapper
 59 |  */
 60 | FILE *fopen(const char *path, const char *mode)
 61 | {
 62 |     fopen_count++;
 63 | #ifdef DEBUG
 64 |     printf("fopen - path:%s, mode:%s\n", path, mode);
 65 | #endif
 66 |     return _libc_fopen(path, mode);
 67 | }
 68 | 
 69 | #if defined(_LARGEFILE64_SOURCE) && !defined(__APPLE__)
 70 | FILE *fopen64(const char *path, const char *mode)
 71 | {
 72 |     fopen_count++;
 73 | #ifdef DEBUG
 74 |     printf("fopen - path:%s, mode:%s\n", path, mode);
 75 | #endif
 76 |     return _libc_fopen64(path, mode);    
 77 | }
 78 | #endif
 79 | 
 80 | /****************************************************************************************************
 81 |  * 
 82 |  *                                  Standard stdio function wrappers
 83 |  * 
 84 |  ****************************************************************************************************/
 85 | 
 86 | /*
 87 |  * fwrite wrapper
 88 |  */
 89 | size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
 90 | {
 91 |     if (stream != stderr && stream != stdout)
 92 |         fwrite_count++;
 93 | #ifdef DEBUG
 94 |     printf("fwrite - stream:%p, buffer:%p, size:%ld, nmemb:%ld\n", stream, ptr, size, nmemb);
 95 | #endif
 96 |     return _libc_fwrite(ptr, size, nmemb, stream);
 97 | }
 98 | 
 99 | /*
100 |  *  fputc wrapper
101 |  */
102 | int fputc(int character, FILE *stream)
103 | {
104 |     if (stream != stderr && stream != stdout)
105 |         fputc_count++;
106 | #ifdef DEBUG
107 |     printf("fputc - stream:%p, character:%x \n", stream, character);
108 | #endif
109 |     return _libc_fputc(character, stream);
110 | }
111 | 
112 | /*
113 |  *  fputs wrapper
114 |  */
115 | int fputs(const char *str, FILE *stream)
116 | {
117 |     if (stream != stderr && stream != stdout)
118 |         fputs_count++;
119 | #ifdef DEBUG
120 |     printf("fputs - stream:%p, buffer:%s\n", stream, str);
121 | #endif
122 |     return _libc_fputs(str, stream);
123 | }
124 | 
125 | /*
126 |  * fread wrapper
127 |  */
128 | size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
129 | {
130 |     if (stream != stderr && stream != stdout)
131 |         fread_count++;
132 | #ifdef DEBUG
133 |     printf("fread - stream:%p, buffer:%p, size:%ld, nmemb:%ld\n", stream, ptr, size, nmemb);
134 | #endif
135 |     return _libc_fread(ptr, size, nmemb, stream);
136 | }
137 | 
138 | /*
139 |  * fseek wrapper
140 |  */
141 | int fseek(FILE *stream, long offset, int whence)
142 | {
143 |     if (stream != stderr && stream != stdout)
144 |         fseek_count++;
145 | #ifdef DEBUG
146 |     printf("fseek - stream:%p, offest:%ld, whence:%d\n", stream, offset, whence);
147 | #endif
148 |     return _libc_fseek(stream, offset, whence);
149 | }
150 | 
151 | /*
152 |  *  fgetc wrapper
153 |  */
154 | int fgetc(FILE *stream)
155 | {
156 |     if (stream != stderr && stream != stdout)
157 |         fgetc_count++;
158 | #ifdef DEBUG
159 |     printf("fgetc - stream:%p\n", stream);
160 | #endif
161 |     return _libc_fgetc(stream);
162 | }
163 | 
164 | /*
165 |  *  fgets wrapper
166 |  */
167 | char *fgets(char *str, int num, FILE *stream)
168 | {
169 |     if (stream != stderr && stream != stdout)
170 |         fgets_count++;
171 | #ifdef DEBUG
172 |     printf("fgets - stream:%p, buffer:%s, size:%d\n", stream, str, num);
173 | #endif
174 |     return _libc_fgets(str, num, stream);
175 | }
176 | 
177 | /////////////////////////////////////////////////////////////////////////////////////////////////
178 | /*
179 |  * ftell wrapper
180 |  */
181 | long ftell(FILE *stream)
182 | {
183 |     if (stream != stderr && stream != stdout)
184 |         ftell_count++;
185 | #ifdef DEBUG
186 |     printf("ftell - stream:%p\n", stream);
187 | #endif
188 |     return _libc_ftell(stream);
189 | }
190 | 
191 | off_t ftello(FILE *stream)
192 | {
193 |     if (stream != stderr && stream != stdout)
194 |         ftell_count++;
195 | #ifdef DEBUG
196 |     printf("ftello - stream:%p\n", stream);
197 | #endif
198 |     return _libc_ftello(stream);
199 | }
200 | 
201 | #if defined(_LARGEFILE64_SOURCE) && !defined(__APPLE__)
202 | off64_t ftello64(FILE *stream)
203 | {
204 |     if (stream != stderr && stream != stdout)
205 |         ftell_count++;
206 | #ifdef DEBUG
207 |     printf("ftello64 - stream:%p\n", stream);
208 | #endif
209 |     return _libc_ftello64(stream);
210 | }
211 | #endif
212 | 
213 | /////////////////////////////////////////////////////////////////////////////////////////////////
214 | /*
215 |  * fclose wrapper
216 |  */
217 | int fclose(FILE *stream)
218 | {
219 |     if (stream != stderr && stream != stdout)
220 |         fclose_count++;
221 | #ifdef DEBUG
222 |     printf("fclose - stream:%p\n", stream);
223 | #endif
224 |     return _libc_fclose(stream);
225 | }
226 | 
227 | /****************************************************************************************************
228 |  * 
229 |  *                                  Nonlocking stdio function wrappers
230 |  * 
231 |  ****************************************************************************************************/
232 | 
233 | /*
234 |  *  fwrite_unlocked wrapper
235 |  */
236 | #ifndef __OPTIMIZE__
237 | size_t fwrite_unlocked(const void *ptr, size_t size, size_t nmemb, FILE *stream)
238 | {
239 |     if (stream != stderr && stream != stdout)
240 |         fwrite_unlocked_count++;
241 | #ifdef DEBUG
242 |     printf("fwrite_unlocked - stream:%p, buffer:%p, size:%ld, nmemb:%ld\n", stream, ptr, size, nmemb);
243 | #endif
244 |     return _libc_fwrite_unlocked(ptr, size, nmemb, stream);
245 | }
246 | #endif
247 | /*
248 |  *  fputc_unlocked wrapper
249 |  */
250 | int fputc_unlocked(int character, FILE *stream)
251 | {
252 |     if (stream != stderr && stream != stdout)
253 |         fputc_unlocked_count++;
254 | #ifdef DEBUG
255 |     printf("fputs_unlocked - stream:%p, character:%c \n", stream, character);
256 | #endif
257 |     return _libc_fputc_unlocked(character, stream);
258 | }
259 | 
260 | /*
261 |  *  fputs_unlocked wrapper
262 |  */
263 | int fputs_unlocked(const char *str, FILE *stream)
264 | {
265 |     if (stream != stderr && stream != stdout)
266 |         fputs_unlocked_count++;
267 | #ifdef DEBUG
268 |     printf("fputs_unlocked - stream:%p, buffer:%s\n", stream, str);
269 | #endif
270 |     return _libc_fputs_unlocked(str, stream);
271 | }
272 | 
273 | /*
274 |  * fread_unlocked wrapper
275 |  */
276 | #ifndef __OPTIMIZE__
277 | size_t fread_unlocked(void *ptr, size_t size, size_t nmemb, FILE *stream)
278 | {
279 |     if (stream != stderr && stream != stdout)
280 |         fread_unlocked_count++;
281 | #ifdef DEBUG
282 |     printf("fread_unlocked - stream:%p, buffer:%p, size:%ld, nmemb:%ld\n", stream, ptr, size, nmemb);
283 | #endif
284 |     return _libc_fread_unlocked(ptr, size, nmemb, stream);
285 | }
286 | #endif
287 | /*
288 |  * fgetc_unlocked wrapper
289 |  */
290 | int fgetc_unlocked(FILE *stream)
291 | {
292 |     if (stream != stderr && stream != stdout)
293 |         fgetc_unlocked_count++;
294 | #ifdef DEBUG
295 |     printf("fgetc_unlocked - stream:%p\n", stream);
296 | #endif
297 |     return _libc_fgetc_unlocked(stream);
298 | }
299 | 
300 | /*
301 |  *  fgets_unlocked wrapper
302 |  */
303 | char *fgets_unlocked(char *str, int num, FILE *stream)
304 | {
305 |     if (stream != stderr && stream != stdout)
306 |         fgets_unlocked_count++;
307 | #ifdef DEBUG
308 |     printf("fgets_unlocked - stream:%p, buffer:%s, size:%d\n", stream, str, num);
309 | #endif
310 |     return _libc_fgets_unlocked(str, num, stream);
311 | }
312 | 
313 | int open(const char *pathname, int flags, ...)
314 | {
315 |     open_count++;
316 | #ifdef DEBUG
317 |     printf("open - path:%s\n", pathname);
318 | #endif
319 |     return _posix_open(pathname, flags);
320 | }
321 | 
322 | ssize_t read(int fd, void *buf, size_t count)
323 | {
324 |     read_count++;
325 | #ifdef DEBUG
326 |     printf("read - fd %d, buf:%p, count:%ld\n", fd, buf, count);
327 | #endif
328 |     return _posix_read(fd, buf, count);
329 | }
330 | 
331 | ssize_t write(int fd, const void *buf, size_t count)
332 | {
333 |     write_count++;
334 | #ifdef DEBUG
335 |     printf("write - fd %d, buf:%p, count:%ld\n", fd, buf, count);
336 | #endif
337 |     return _posix_write(fd, buf, count);
338 | }
339 | 
340 | off_t lseek(int fd, off_t offset, int whence)
341 | {
342 |     lseek_count++;
343 | #ifdef DEBUG
344 |     printf("lseek - fd %d, offset:%ld, whence:%d\n", fd, offset, whence);
345 | #endif
346 |     return _posix_lseek(fd, offset, whence);
347 | }
348 | 
349 | int close(int fd)
350 | {
351 |     close_count++;
352 | #ifdef DEBUG
353 |     printf("close - fd %d\n", fd);
354 | #endif
355 |     return _posix_close(fd);
356 | }
357 | 
358 | /*
359 |  * Fuction prints the banner and the library info
360 |  */
361 | void show_banner()
362 | {
363 |     printf("===========================================\n");
364 |     printf("\t\tlibfioinfo\n");
365 |     printf("Version: 0.3\n");
366 |     printf("Author: Marek Zmysłowski\n");
367 |     printf("===========================================\n\n");
368 | }
369 | 
370 | /*
371 |  * Function that prints statistics of the function calls
372 |  */
373 | void show_results()
374 | {
375 |     printf("===========================================\n");
376 |     printf("\tFile calls statistics:\n");
377 |     printf("fopen:  %d\n", fopen_count);
378 |     printf("fwrite: %d - unlocked: %d\n", fwrite_count, fwrite_unlocked_count);
379 |     printf("fputc:  %d - unlocked: %d\n", fputc_count, fputc_unlocked_count);
380 |     printf("fputs:  %d - unlocked: %d\n", fputs_count, fputs_unlocked_count);
381 |     printf("fread:  %d - unlocked: %d\n", fread_count, fread_unlocked_count);
382 |     printf("fgetc:  %d - unlocked: %d\n", fgetc_count, fgetc_unlocked_count);
383 |     printf("fgets:  %d - unlocked: %d\n", fgets_count, fgets_unlocked_count);
384 |     printf("fseek:  %d\n", fseek_count);
385 |     printf("ftell:  %d\n", ftell_count);
386 |     printf("fclose: %d\n", fclose_count);
387 |     printf ("\n");
388 |     printf("open:   %d\n", open_count);
389 |     printf("read:   %d\n", read_count);
390 |     printf("write:  %d\n", write_count);
391 |     printf("lseek:  %d\n", lseek_count);
392 |     printf("close:  %d\n", close_count);
393 |     printf("===========================================\n");
394 | }
395 | 
396 | /*
397 |  * Library constructor
398 |  */
399 | __attribute__((constructor)) static void init(void)
400 | {
401 |     _libc_fopen = (FILE * (*)(const char *path, const char *mode)) dlsym(RTLD_NEXT, "fopen");
402 | 
403 |     _libc_fwrite = (size_t (*)(const void *ptr, size_t size, size_t nmemb, FILE *stream))dlsym(RTLD_NEXT, "fwrite");
404 |     _libc_fputc = (int (*)(int character, FILE *fp))dlsym(RTLD_NEXT, "fputc");
405 |     _libc_fputs = (int (*)(const char *str, FILE *fp))dlsym(RTLD_NEXT, "fputs");
406 |     _libc_fread = (size_t (*)(void *ptr, size_t size, size_t nmemb, FILE *stream))dlsym(RTLD_NEXT, "fread");
407 |     _libc_fgetc = (int (*)(FILE * fp)) dlsym(RTLD_NEXT, "fgetc");
408 |     _libc_fgets = (char *(*)(char *str, int num, FILE *fp))dlsym(RTLD_NEXT, "fgets");
409 | 
410 |     _libc_fseek = (int (*)(FILE * stream, long offset, int whence)) dlsym(RTLD_NEXT, "fseek");
411 |     _libc_fseeko = (int (*)(FILE * stream, off_t offset, int whence)) dlsym(RTLD_NEXT, "fseeko");
412 | 
413 |     _libc_ftell = (long (*)(FILE * fp)) dlsym(RTLD_NEXT, "ftell");
414 |     _libc_ftello = (off_t (*)(FILE * fp)) dlsym(RTLD_NEXT, "ftello");
415 | 
416 | #if defined(_LARGEFILE64_SOURCE) && !defined(__APPLE__)
417 |     _libc_fopen64 = (FILE * (*)(const char *path, const char *mode)) dlsym(RTLD_NEXT, "fopen64");
418 |     _libc_ftello64 = (off64_t(*)(FILE * fp)) dlsym(RTLD_NEXT, "ftello64");
419 |     _libc_fseeko64 = (int (*)(FILE * stream, off64_t offset, int whence)) dlsym(RTLD_NEXT, "fseeko64");
420 | #endif
421 | 
422 |     _libc_fclose = (int (*)(FILE * fp)) dlsym(RTLD_NEXT, "fclose");
423 | 
424 |     _libc_fwrite_unlocked = (size_t (*)(const void *ptr, size_t size, size_t nmemb, FILE *stream))dlsym(RTLD_NEXT, "fwrite_unlocked");
425 |     _libc_fputc_unlocked = (int (*)(int character, FILE *fp))dlsym(RTLD_NEXT, "fputc_unlocked");
426 |     _libc_fputs_unlocked = (int (*)(const char *str, FILE *fp))dlsym(RTLD_NEXT, "fputs_unlocked");
427 |     _libc_fread_unlocked = (size_t(*)(void *ptr, size_t size, size_t nmemb, FILE *stream))dlsym(RTLD_NEXT, "fread_unlocked");
428 |     _libc_fgetc_unlocked = (int (*)(FILE * fp)) dlsym(RTLD_NEXT, "fgetc_unlocked");
429 |     _libc_fgets_unlocked = (char *(*)(char *str, int num, FILE *fp))dlsym(RTLD_NEXT, "fgets_unlocked");
430 | 
431 |     _posix_open = (int (*)(const char *pathname, int flags, ...))dlsym(RTLD_NEXT, "open");
432 |     _posix_read = (ssize_t (*)(int fd, void *buf, size_t count))dlsym(RTLD_NEXT, "read");
433 |     _posix_write = (ssize_t (*)(int fd, const void *buf, size_t count))dlsym(RTLD_NEXT, "write");
434 |     _posix_lseek = (off_t (*)(int fd, off_t offset, int whence))dlsym(RTLD_NEXT, "lseek");
435 |     _posix_close = (int (*)(int fd))dlsym(RTLD_NEXT, "close");
436 | 
437 |     fopen_count = 0;
438 |     fwrite_count = 0;
439 |     fputc_count = 0;
440 |     fputs_count = 0;
441 |     fread_count = 0;
442 |     fgetc_count = 0;
443 |     fgets_count = 0;
444 |     fseek_count = 0;
445 |     ftell_count = 0;
446 |     fclose_count = 0;
447 | 
448 |     fwrite_unlocked_count = 0;
449 |     fputc_unlocked_count = 0;
450 |     fputs_unlocked_count = 0;
451 |     fread_unlocked_count = 0;
452 |     fgetc_unlocked_count = 0;
453 |     fgets_unlocked_count = 0;
454 | 
455 |     open_count = 0;
456 |     read_count = 0;
457 |     write_count = 0;
458 |     lseek_count = 0;
459 |     close_count = 0;
460 | 
461 |     show_banner();
462 | }
463 | 
464 | /*
465 |  * Library destructor
466 |  */
467 | __attribute__((destructor)) static void unload(void)
468 | {
469 |     show_results();
470 | }


--------------------------------------------------------------------------------
/libfiowrapper.c:
--------------------------------------------------------------------------------
  1 | /*
  2 |  * File I/O Functions Info
  3 |  * This library provides the statistics what functions where used during the execution. 
  4 |  * 
  5 |  * Author: Marek Zmysłowski
  6 |  * Version: 0.3
  7 |  * 
  8 |  * Licensed under the Apache License, Version 2.0 (the "License");
  9 |  * you may not use this file except in compliance with the License.
 10 |  * You may obtain a copy of the License at:
 11 |  *      http://www.apache.org/licenses/LICENSE-2.0
 12 |  * This is the real deal: the program takes an instrumented binary and
 13 |  * attempts a variety of basic fuzzing tricks, paying close attention to
 14 |  * how they affect the execution path.
 15 |  * 
 16 |  */
 17 | 
 18 | #define _GNU_SOURCE
 19 | 
 20 | #include <dlfcn.h>
 21 | 
 22 | #include <stdlib.h>
 23 | #include <stdio.h>
 24 | #include <string.h>
 25 | 
 26 | #include "libfiodef.h"
 27 | 
 28 | #define AFL_FILE_NAME ".cur_input"
 29 | struct _AFL_MEMORY_FILE_
 30 | {
 31 |     // This definition is very limited for now
 32 |     FILE *stream;
 33 |     unsigned char *buffer;
 34 |     int read_pointer;
 35 |     ssize_t size;
 36 |     int memory;
 37 |     int fd;
 38 | } afl_input_file;
 39 | 
 40 | // This is used to speed up the process of allocating the FILE structure for the AFL input file/
 41 | // This needs to be done as valid pointer to the FILE struct needs to be returned
 42 | // QUESTION: does this structur needs to contain any real values or can be zeroed as it caputer all f* calls
 43 | FILE _fake_file;
 44 | 
 45 | /*
 46 |  * Function sets the pointer for the shared memory from the AFL.
 47 |  */
 48 | void set_memory_ptr(unsigned char *buffer)
 49 | {
 50 | #ifdef DEBUG
 51 |     printf("set_memory_ptr:%p\n", buffer);
 52 | #endif
 53 |     afl_input_file.size = 0;
 54 |     afl_input_file.buffer = buffer;
 55 |     afl_input_file.memory = 1;
 56 |     afl_input_file.read_pointer = 0;
 57 |     afl_input_file.stream = &_fake_file;
 58 | }
 59 | 
 60 | /*
 61 |  * Function sets the "size" of the shared memory.
 62 |  * The shared memory from AFL is fixed size. This is needed to understand where the input ends.
 63 |  */
 64 | void set_memory_size(ssize_t size)
 65 | {
 66 | #ifdef DEBUG
 67 |     printf("set_memory_size:%ld\n", size);
 68 | #endif
 69 |     afl_input_file.size = size;
 70 |     afl_input_file.read_pointer = 0;
 71 | }
 72 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 73 | 
 74 | /*
 75 |  * fopen wrapper
 76 |  * 
 77 |  * If the memory was not initialized, the function will open file, copy it to memory and return fake structure.
 78 |  * If the memory was initialized, it just return the fake structure.
 79 |  * 
 80 |  * TODO: Add fopen64 when requested. Investigate if requires.
 81 |  */
 82 | FILE *_fopen(const char *path, const char *mode)
 83 | {
 84 | #ifdef DEBUG
 85 |     printf("fopen - path:%s, mode:%s\n", path, mode);
 86 | #endif
 87 |     if (strstr(path, AFL_FILE_NAME) != NULL)
 88 |     {
 89 |         // AFL input file
 90 |         if (!afl_input_file.memory)
 91 |         {
 92 | #ifdef DEBUG
 93 |             printf("fopen - loading file into memory\n");
 94 | #endif    
 95 |             afl_input_file.stream = _libc_fopen(path, mode);
 96 |             /* Get the number of bytes */
 97 |             _libc_fseek(afl_input_file.stream, 0L, SEEK_END);
 98 |             afl_input_file.size = _libc_ftell(afl_input_file.stream);
 99 |             _libc_fseek(afl_input_file.stream, 0L, SEEK_SET);
100 | 
101 | 
102 | #ifdef DEBUG
103 |             printf("fopen - size:%ld\n", afl_input_file.size);
104 | #endif
105 |             afl_input_file.buffer = malloc(afl_input_file.size + 1);
106 |             _libc_fread(afl_input_file.buffer, 1, afl_input_file.size, afl_input_file.stream);
107 |             afl_input_file.read_pointer = 0;
108 |         }
109 |         return afl_input_file.stream;
110 |     }
111 |     // The other file is requested to be opened
112 |     return _libc_fopen(path, mode);
113 | }
114 | 
115 | FILE *fopen(const char *path, const char *mode)
116 | {
117 |     return _fopen(path, mode);
118 | }
119 | 
120 | #if defined(_LARGEFILE64_SOURCE) && !defined(__APPLE__)
121 | FILE *fopen64(const char *path, const char *mode)
122 | {
123 |     return _fopen(path, mode);
124 | }
125 | #endif
126 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
127 | /*
128 |  * fwrite wrapper
129 |  * 
130 |  * Currently the assumption is, that the data stored by the application are not used at all so 
131 |  * it just fakes the data were written.
132 |  * 
133 |  * Note: The other functionality is not implemented. I assume that the fuzzed application is not writing to the input
134 |  */
135 | 
136 | size_t _fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
137 | {
138 |     return size * nmemb;
139 | }
140 | 
141 | size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
142 | {
143 | #ifdef DEBUG
144 |     printf("fwrite - stream:%p, buffer:%p, size:%ld, nmemb:%ld\n", stream, ptr, size, nmemb);
145 | #endif
146 |     return _fwrite(ptr, size, nmemb, stream);
147 | }
148 | 
149 | //
150 | // fwrite_unlocked in optimized version is a preprocessor declaration that uses fputc_unlocked
151 | //
152 | #ifndef __OPTIMIZE__
153 | size_t fwrite_unlocked(const void *ptr, size_t size, size_t nmemb, FILE *stream)
154 | {
155 | #ifdef DEBUG
156 |     printf("fwrite - stream:%p, buffer:%p, size:%ld, nmemb:%ld\n", stream, ptr, size, nmemb);
157 | #endif
158 |     return _fwrite(ptr, size, nmemb, stream);
159 | }
160 | #endif
161 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
162 | /*
163 |  *  fputc wrapper
164 |  * 
165 |  *  The function fakes that the write operation was performed.
166 |  * 
167 |  *  Note: The other functionality is not implemented. I assume that the fuzzed application is not writing to the input.
168 |  */
169 | int _fputc(int character, FILE *stream)
170 | {
171 |     return character;
172 | }
173 | 
174 | int fputc(int character, FILE *stream)
175 | {
176 | #ifdef DEBUG
177 |     printf("fputc - stream:%p, character:0x%.2X\n", stream, character);
178 | #endif
179 |     return _fputc(character, stream);
180 | }
181 | 
182 | int fputc_unlocked(int character, FILE *stream)
183 | {
184 | #ifdef DEBUG
185 |     printf("fputc_unlocked - stream:%p, character:0x%.2X\n", stream, character);
186 | #endif
187 |     return _fputc(character, stream);
188 | }
189 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
190 | /*
191 |  *  fputs wrapper
192 |  * 
193 |  *  The function fakes that the write operation was performed.
194 |  *  TODO: verify what exact value is returned on success.
195 |  * 
196 |  *  Note: The other functionality is not implemented. I assume that the fuzzed application is not writing to the input.
197 |  */
198 | int _fputs(const char *str, FILE *stream)
199 | {
200 |     return 1;
201 | }
202 | 
203 | int fputs(const char *str, FILE *stream)
204 | {
205 | #ifdef DEBUG
206 |     printf("fputs - stream:%p, buffer:%s\n", stream, str);
207 | #endif
208 |     return _fputs(str, stream);
209 | }
210 | 
211 | //
212 | // fputs_unlocked in optimized version is a preprocessor declaration that uses fputc_unlocked
213 | //
214 | #ifndef __OPTIMIZE__
215 | int fputs_unlocked(const char *str, FILE *stream)
216 | {
217 | #ifdef DEBUG
218 |     printf("fputs_unlocked - stream:%p, buffer:%s\n", stream, str);
219 | #endif
220 |     return _fputs(str, stream);
221 | }
222 | #endif
223 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
224 | /*
225 |  * fread wrapper
226 |  */
227 | size_t _fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
228 | {
229 |     if (stream == afl_input_file.stream)
230 |     {
231 |         size_t bytes_to_copy_left = size * nmemb;
232 |         size_t bytes_copied = 0;
233 |         while (bytes_to_copy_left)
234 |         {
235 |             if (afl_input_file.read_pointer == afl_input_file.size)
236 |                 break;
237 |             ((char *)ptr)[bytes_copied] = afl_input_file.buffer[afl_input_file.read_pointer];
238 |             afl_input_file.read_pointer++;
239 |             bytes_to_copy_left--;
240 |             bytes_copied++;
241 |         }
242 |         return bytes_copied;
243 |     }
244 |     else
245 |     {
246 |         return _libc_fread(ptr, size, nmemb, stream);
247 |     }
248 | }
249 | 
250 | size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
251 | {
252 | #ifdef DEBUG
253 |     printf("fread - stream:%p, buffer:%p, size:%ld, nmemb:%ld\n", stream, ptr, size, nmemb);
254 | #endif
255 |     return _fread(ptr, size, nmemb, stream);
256 | }
257 | 
258 | //
259 | // fread_unlocked in optimized version is a preprocessor declaration that uses fgetc_unlocked
260 | //
261 | #ifndef __OPTIMIZE__
262 | size_t fread_unlocked(void *ptr, size_t size, size_t nmemb, FILE *stream)
263 | {
264 | #ifdef DEBUG
265 |     printf("fread_unlocked - stream:%p, buffer:%p, size:%ld, nmemb:%ld\n", stream, ptr, size, nmemb);
266 | #endif
267 |     return _fread(ptr, size, nmemb, stream);
268 | }
269 | #endif
270 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
271 | /*
272 |  *  fgetc wrapper
273 |  */
274 | int _fgetc(FILE *stream)
275 | {
276 |     char c;
277 |     if (stream == afl_input_file.stream)
278 |     {
279 |         if (afl_input_file.read_pointer == afl_input_file.size)
280 |         {
281 |             // This is the end of the file
282 |             return EOF;
283 |         }
284 |         c = afl_input_file.buffer[afl_input_file.read_pointer];
285 |         afl_input_file.read_pointer++;
286 |         return (unsigned char)c;
287 |     }
288 |     else
289 |     {
290 |         return _libc_fgetc(stream);
291 |     }
292 | }
293 | 
294 | int fgetc(FILE *stream)
295 | {
296 | #ifdef DEBUG
297 |     char c = _fgetc(stream);
298 |     printf("fgetc - stream:%p, returned:0x%.2X\n", stream, c);
299 |     return c;
300 | #else
301 |     return _fgetc(stream);
302 | #endif
303 | }
304 | 
305 | int fgetc_unlocked(FILE *stream)
306 | {
307 | #ifdef DEBUG
308 |     char c = _fgetc(stream);
309 |     printf("fgetc_unlocked - stream:%p, returned:0x%.2X\n", stream, c);
310 |     return c;
311 | #else
312 |     return _fgetc(stream);
313 | #endif
314 | }
315 | 
316 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
317 | /*
318 |  *  fgets wrapper
319 |  * 
320 |  *  TODO: Fix the function.
321 |  */
322 | char *_fgets(char *str, int num, FILE *stream)
323 | {
324 |     return NULL;
325 | }
326 | 
327 | char *fgets(char *str, int num, FILE *stream)
328 | {
329 | #ifdef DEBUG
330 |     printf("fgets - stream:%p, str:%s, num:%d\n", stream, str, num);
331 | #endif
332 |     return _fgets(str, num, stream);
333 | }
334 | 
335 | char *fgets_unlocked(char *str, int num, FILE *stream)
336 | {
337 | #ifdef DEBUG
338 |     printf("fgets_unlocked - stream:%p, str:%s, num:%d\n", stream, str, num);
339 | #endif
340 |     return _fgets(str, num, stream);
341 | }
342 | 
343 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
344 | /*
345 |  * fseek wrapper
346 |  * 
347 |  * TODO: Make sure that the offsets are correct.
348 |  */
349 | int _fseek(FILE *fp, off64_t offset, int whence) {
350 |     switch (whence)
351 |     {
352 |         case SEEK_CUR:
353 |         case SEEK_END:
354 |             if (afl_input_file.read_pointer + offset >= afl_input_file.size || afl_input_file.read_pointer + offset < 0)
355 |             {
356 |                 afl_input_file.read_pointer = afl_input_file.size;
357 |                 return EOF;
358 |             }
359 |             else
360 |             {
361 |                 afl_input_file.read_pointer += offset;
362 |                 return 0;
363 |             }
364 |             break;
365 |         case SEEK_SET:
366 |             if (offset >= afl_input_file.size)
367 |                 return EOF;
368 |             else
369 |                 afl_input_file.read_pointer = offset;
370 |             return 0;
371 |             break;
372 |         default:
373 |             return EOF;
374 |     }
375 | }
376 | 
377 | int fseek(FILE *stream, long offset, int whence)
378 | {
379 | #ifdef DEBUG
380 |     printf("fseek - stream:%p, offset:%ld, whence:%d\n", stream, offset, whence);
381 | #endif
382 |     if (stream == afl_input_file.stream)
383 |         return _fseek(stream, offset, whence);
384 |     return _libc_fseek(stream, offset, whence);
385 | }
386 | 
387 | int fseeko(FILE *stream, off_t offset, int whence)
388 | {
389 | #ifdef DEBUG
390 |     printf("fseeko - stream:%p, offset:%ld, whence:%d\n", stream, offset, whence);
391 | #endif
392 |     if (stream == afl_input_file.stream)
393 |         return _fseek(stream, offset, whence);
394 |     return _libc_fseeko(stream, offset, whence);
395 | }
396 | 
397 | int fseeko64(FILE *stream, off64_t offset, int whence)
398 | {
399 | #ifdef DEBUG
400 |     printf("fseeko64 - stream:%p, offset:%ld, whence:%d\n", stream, offset, whence);
401 | #endif
402 |     if (stream == afl_input_file.stream)
403 |         return _fseek(stream, offset, whence);
404 |     return _libc_fseeko64(stream, offset, whence);
405 | }
406 | 
407 | long ftell(FILE *stream)
408 | {
409 | #ifdef DEBUG
410 |     printf("ftell - stream:%p\n", stream);
411 | #endif
412 |     if (stream == afl_input_file.stream)
413 |     {
414 |         return afl_input_file.read_pointer;
415 |     }
416 |     else
417 |     {
418 |         return _libc_ftell(stream);
419 |     }
420 | }
421 | #if defined(_LARGEFILE64_SOURCE) && !defined(__APPLE__)
422 | off_t ftello64(FILE *stream)
423 | {
424 | #ifdef DEBUG
425 |     printf("ftello64 - stream:%p\n", stream);
426 | #endif
427 |     if (stream == afl_input_file.stream)
428 |     {
429 |         return (off_t)afl_input_file.read_pointer;
430 |     }
431 |     else
432 |     {
433 |         return _libc_ftello64(stream);
434 |     }
435 | }
436 | #endif
437 | 
438 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
439 | /*
440 |  * fclose wrapper
441 |  */
442 | int fclose(FILE *stream)
443 | {
444 | #ifdef DEBUG
445 |     printf("fclose - stream:%p\n", stream);
446 | #endif
447 |     if (stream == afl_input_file.stream)
448 |     {
449 |         if (!afl_input_file.memory)
450 |             return _libc_fclose(stream);
451 |         else
452 |             return 0;
453 |     }
454 |     else
455 |         return _libc_fclose(stream);
456 | }
457 | 
458 | // TODO Fix argument passing
459 | int open(const char *pathname, int flags, ...)
460 | {
461 | #ifdef DEBUG
462 |     printf("open - path:%s\n", pathname);
463 | #endif
464 |     if (strstr(pathname, AFL_FILE_NAME) != NULL)
465 |     {
466 |         if (!afl_input_file.memory)
467 |         {
468 |             // TODO Fix later
469 |         }
470 |         return afl_input_file.fd;
471 |     }
472 |     return _posix_open(pathname, flags);
473 | }
474 | 
475 | ssize_t read(int fd, void *buf, size_t count)
476 | {
477 | #ifdef DEBUG
478 |     printf("read - fd %d, buf:%p, count:%ld\n", fd, buf, count);
479 | #endif
480 |     if (fd == afl_input_file.fd)
481 |     {
482 |         size_t bytes_to_copy_left = count;
483 |         size_t bytes_copied = 0;
484 |         while (bytes_to_copy_left)
485 |         {
486 |             if (afl_input_file.read_pointer == afl_input_file.size)
487 |                 break;
488 |             ((char *)buf)[bytes_copied] = afl_input_file.buffer[afl_input_file.read_pointer];
489 |             afl_input_file.read_pointer++;
490 |             bytes_to_copy_left--;
491 |             bytes_copied++;
492 |         }
493 |         return bytes_copied;
494 |     }
495 |     else
496 |     {
497 |         return _posix_read(fd, buf, count);
498 |     }
499 | }
500 | 
501 | ssize_t write(int fd, const void *buf, size_t count)
502 | {
503 | #ifdef DEBUG
504 |     printf("write - fd %d, buf:%p, count:%ld\n", fd, buf, count);
505 | #endif
506 |     return _posix_write(fd, buf, count);
507 | }
508 | 
509 | off_t lseek(int fd, off_t offset, int whence)
510 | {
511 | #ifdef DEBUG
512 |     printf("lseek - fd %d, offset:%ld, whence:%d\n", fd, offset, whence);
513 | #endif
514 |     if (fd == afl_input_file.fd)
515 |     {
516 |         switch (whence)
517 |         {
518 |         case SEEK_CUR:
519 |         case SEEK_END:
520 |             if (afl_input_file.read_pointer + offset >= afl_input_file.size || afl_input_file.read_pointer + offset < 0)
521 |             {
522 |                 afl_input_file.read_pointer = afl_input_file.size;
523 |                 return EOF;
524 |             }
525 |             else
526 |             {
527 |                 afl_input_file.read_pointer += offset;
528 |                 return 0;
529 |             }
530 |             break;
531 |         case SEEK_SET:
532 |             if (offset >= afl_input_file.size)
533 |                 return EOF;
534 |             else
535 |                 afl_input_file.read_pointer = offset;
536 |             return 0;
537 |             break;
538 |         default:
539 |             return EOF;
540 |         }
541 |     }
542 |     else
543 |     {
544 |         return _posix_lseek(fd, offset, whence);
545 |     } 
546 | }
547 | 
548 | int close(int fd)
549 | {
550 | #ifdef DEBUG
551 |     printf("close - fd %d\n", fd);
552 | #endif
553 |     if (fd == afl_input_file.fd)
554 |     {
555 |         // TODO Fix this
556 |         return 0;
557 |     }
558 |     else
559 |         return _posix_close(fd);
560 | }
561 | ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
562 | /*
563 |  * fileno wrapper
564 |  */
565 | int fileno(FILE *stream)
566 | {
567 | #ifdef DEBUG
568 |     printf("fileno - stream:%p\n", stream);
569 | #endif
570 |     if (stream == afl_input_file.stream)
571 |         return afl_input_file.fd;
572 |     return _libc_fileno(stream);
573 | }
574 | 
575 | #ifndef __OPTIMIZE__
576 | int fileno_unlocked(FILE *stream)
577 | {
578 | #ifdef DEBUG
579 |     printf("fileno_unlocked - stream:%p\n", stream);
580 | #endif
581 |     if (stream == afl_input_file.stream)
582 |         return afl_input_file.fd;
583 |     return _libc_fileno_unlocked(stream);
584 | }
585 | #endif
586 | 
587 | 
588 | /*
589 |  * Library constructor
590 |  */
591 | __attribute__((constructor)) static void init(void)
592 | {
593 |     // TODO Remove unused functions
594 |     _libc_fopen = (FILE * (*)(const char *path, const char *mode)) dlsym(RTLD_NEXT, "fopen");
595 | 
596 |     _libc_fwrite = (size_t(*)(const void *ptr, size_t size, size_t nmemb, FILE *stream))dlsym(RTLD_NEXT, "fwrite");
597 |     _libc_fputc = (int (*)(int character, FILE *fp))dlsym(RTLD_NEXT, "fputc");
598 |     _libc_fputs = (int (*)(const char *str, FILE *fp))dlsym(RTLD_NEXT, "fputs");
599 |     _libc_fread = (size_t(*)(void *ptr, size_t size, size_t nmemb, FILE *stream))dlsym(RTLD_NEXT, "fread");
600 |     _libc_fseek = (int (*)(FILE * stream, long offset, int whence)) dlsym(RTLD_NEXT, "fseek");
601 |     _libc_fseeko = (int (*)(FILE * stream, off_t offset, int whence)) dlsym(RTLD_NEXT, "fseeko");
602 |     _libc_fseeko64 = (int (*)(FILE * stream, off64_t offset, int whence)) dlsym(RTLD_NEXT, "fseeko64");
603 |     _libc_ftell = (long (*)(FILE * stream)) dlsym(RTLD_NEXT, "ftell");
604 |     _libc_fgetc = (int (*)(FILE * fp)) dlsym(RTLD_NEXT, "fgetc");
605 |     _libc_fgets = (char *(*)(char *str, int num, FILE *fp))dlsym(RTLD_NEXT, "fgets");
606 |     _libc_fclose = (int (*)(FILE * fp)) dlsym(RTLD_NEXT, "fclose");
607 | 
608 | #if defined(_LARGEFILE64_SOURCE) && !defined(__APPLE__)
609 |     _libc_fopen64 = (FILE * (*)(const char *path, const char *mode)) dlsym(RTLD_NEXT, "fopen64");
610 |     _libc_ftello64 = (off_t (*)(FILE * stream)) dlsym(RTLD_NEXT, "ftello64");
611 | #endif
612 |     _libc_fileno = (int (*)(FILE *stream))dlsym(RTLD_NEXT, "fileno");
613 | 
614 |     _libc_fwrite_unlocked = (size_t(*)(const void *ptr, size_t size, size_t nmemb, FILE *stream))dlsym(RTLD_NEXT, "fwrite_unlocked");
615 |     _libc_fputc_unlocked = (int (*)(int character, FILE *fp))dlsym(RTLD_NEXT, "fputc_unlocked");
616 |     _libc_fputs_unlocked = (int (*)(const char *str, FILE *fp))dlsym(RTLD_NEXT, "fputs_unlocked");
617 |     _libc_fread_unlocked = (size_t(*)(void *ptr, size_t size, size_t nmemb, FILE *stream))dlsym(RTLD_NEXT, "fread_unlocked");
618 |     _libc_fgetc_unlocked = (int (*)(FILE * fp)) dlsym(RTLD_NEXT, "fgetc_unlocked");
619 |     _libc_fgets_unlocked = (char *(*)(char *str, int num, FILE *fp))dlsym(RTLD_NEXT, "fgets_unlocked");
620 |     _libc_fileno_unlocked = (int (*)(FILE *stream))dlsym(RTLD_NEXT, "fileno_unlocked");
621 | 
622 |     _posix_open = (int (*)(const char *pathname, int flags, ...))dlsym(RTLD_NEXT, "open");
623 |     _posix_read = (ssize_t (*)(int fd, void *buf, size_t count))dlsym(RTLD_NEXT, "read");
624 |     _posix_write = (ssize_t (*)(int fd, const void *buf, size_t count))dlsym(RTLD_NEXT, "write");
625 |     _posix_lseek = (off_t (*)(int fd, off_t offset, int whence))dlsym(RTLD_NEXT, "lseek");
626 |     _posix_close = (int (*)(int fd))dlsym(RTLD_NEXT, "close");
627 | 
628 |     // get ourselves an fd
629 |     int fd = _posix_open("/dev/null", 2 /* O_RDWR */);
630 |     afl_input_file.memory = 0;
631 |     afl_input_file.fd = fd;
632 | }
633 | 
634 | /*
635 |  * Library destructor
636 |  */
637 | __attribute__((destructor)) static void unload(void)
638 | {
639 | }
640 | 


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