Fuzz introspector
For issues and ideas: https://github.com/ossf/fuzz-introspector/issues

Project functions overview

The following table shows data about each function in the project. The functions included in this table correspond to all functions that exist in the executables of the fuzzers. As such, there may be functions that are from third-party libraries.

For further technical details on the meaning of columns in the below table, please see the Glossary .

Func name Functions filename Args Function call depth Reached by Fuzzers Runtime reached by Fuzzers Combined reached by Fuzzers Fuzzers runtime hit Func lines hit % I Count BB Count Cyclomatic complexity Functions reached Reached by functions Accumulated cyclomatic complexity Undiscovered complexity

Fuzzer details

Fuzzer: tiff_read_rgba_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 1083 52.7%
gold [1:9] 114 5.55%
yellow [10:29] 82 3.99%
greenyellow [30:49] 47 2.28%
lawngreen 50+ 727 35.4%
All colors 2053 100

Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity Unique Reachable Complexities Unique Reachable Functions All non-covered Complexity All Reachable Complexity Function Name Function Callsite Blocked Branch
1442 1442 1 :

['TIFFFlush']

1442 1585 TIFFCleanup call site: 01192 /src/libtiff/libtiff/tif_close.c:49
629 629 1 :

['TIFFFillStripPartial']

629 629 TIFFSeek call site: 01956 /src/libtiff/libtiff/tif_read.c:426
252 474 6 :

['adler32', 'inflate_table', 'fixedtables', 'crc32', 'inflate_fast', 'updatewindow']

252 474 inflate call site: 00000 /src/zlib/inflate.c:817
97 97 1 :

['TIFFSetupStrips']

97 4755 TIFFReadDirectory call site: 01011 /src/libtiff/libtiff/tif_dirread.c:4920
60 60 1 :

['do_sarray_io']

60 62 access_virt_sarray call site: 00000 /src/libjpeg-turbo/src/jmemmgr.c:941
48 66 2 :

['TIFFHashSetLookup', 'TIFFHashSetRemove']

48 138 _TIFFCheckDirNumberAndOffset call site: 00104 /src/libtiff/libtiff/tif_dirread.c:5728
39 39 1 :

['setDoubleArrayOneValue']

39 63 _TIFFVSetField call site: 00000 /src/libtiff/libtiff/tif_dir.c:384
39 39 1 :

['setDoubleArrayOneValue']

39 63 _TIFFVSetField call site: 00000 /src/libtiff/libtiff/tif_dir.c:394
36 36 2 :

['getenv', 'TIFFjpeg_create_compress']

36 36 JPEGInitializeLibJPEG call site: 00000 /src/libtiff/libtiff/tif_jpeg.c:2755
28 28 1 :

['do_barray_io']

28 30 access_virt_barray call site: 00000 /src/libjpeg-turbo/src/jmemmgr.c:1025
21 21 1 :

['deflateEnd']

21 67 ZIPSetupDecode call site: 00000 /src/libtiff/libtiff/tif_zip.c:109
21 21 1 :

['deflateEnd']

21 41 PixarLogCleanup call site: 00000 /src/libtiff/libtiff/tif_pixarlog.c:1500

Runtime coverage analysis

Covered functions
699
Functions that are reachable but not covered
159
Reachable functions
394
Percentage of reachable functions covered
59.64%
NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.
Warning: The number of covered functions are larger than the number of reachable functions. This means that there are more functions covered at runtime than are extracted using static analysis. This is likely a result of the static analysis component failing to extract the right call graph or the coverage runtime being compiled with sanitizers in code that the static analysis has not analysed. This can happen if lto/gold is not used in all places that coverage instrumentation is used.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
/src/libtiff/contrib/oss-fuzz/tiff_read_rgba_fuzzer.cc 2
/src/libtiff/libtiff/tif_error.c 4
/src/libtiff/libtiff/tif_warning.c 2
/src/libtiff/libtiff/tif_stream.cxx 16
/src/libtiff/libtiff/tif_open.c 11
/src/libtiff/libtiff/tif_unix.c 7
/src/libtiff/libtiff/tif_compress.c 2
/src/libtiff/libtiff/tif_swab.c 9
/src/libtiff/libtiff/tif_dir.c 12
/src/libtiff/libtiff/tif_dirinfo.c 12
/src/libtiff/libtiff/tif_aux.c 12
/src/libtiff/libtiff/tif_dirread.c 114
/src/libtiff/libtiff/tif_hash_set.c 13
/src/libtiff/libtiff/tif_codec.c 1
/src/libtiff/libtiff/tif_strip.c 6
/src/libtiff/libtiff/tif_tile.c 5
/src/libtiff/libtiff/tif_write.c 3
/src/libtiff/libtiff/tif_close.c 3
/src/libtiff/libtiff/tif_flush.c 3
/src/libtiff/libtiff/tif_dirwrite.c 69
/src/libtiff/libtiff/tif_getimage.c 20
/src/libtiff/libtiff/tif_color.c 3
/src/libtiff/libtiff/tif_read.c 11
/src/libtiff/libtiff/tif_jpeg.c 6
/src/libjpeg-turbo/src/jerror.c 1
/src/libjpeg-turbo/src/jdapimin.c 5
/src/libjpeg-turbo/src/jmemmgr.c 1
/src/libjpeg-turbo/src/jmemnobs.c 3
/src/libjpeg-turbo/src/jdmarker.c 2
/src/libjpeg-turbo/src/jdinput.c 1
/src/libjpeg-turbo/src/jcomapi.c 2

Analyses and suggestions

Optimal target analysis

Remaining optimal interesting functions

The following table shows a list of functions that are optimal targets. Optimal targets are identified by finding the functions that in combination, yield a high code coverage.

Func name Functions filename Arg count Args Function depth hitcount instr count bb count cyclomatic complexity Reachable functions Incoming references total cyclomatic complexity Unreached complexity
OJPEGPreDecode /src/libtiff/libtiff/tif_ojpeg.c 2 ['N/A', 'short'] 16 0 373 52 20 164 0 1426 1031
JPEGPreEncode /src/libtiff/libtiff/tif_jpeg.c 2 ['N/A', 'short'] 8 0 625 84 30 95 0 864 677
encode_mcu_huff /src/libjpeg-turbo/src/jchuff.c 2 ['N/A', 'N/A'] 3 0 232 33 14 7 0 595 595
PixarLogEncode /src/libtiff/libtiff/tif_pixarlog.c 4 ['N/A', 'N/A', 'size_t', 'short'] 6 0 354 41 8 51 0 566 492
PixarLogDecode /src/libtiff/libtiff/tif_pixarlog.c 4 ['N/A', 'N/A', 'size_t', 'short'] 4 0 537 58 12 23 0 421 365
read_markers /src/libjpeg-turbo/src/jdmarker.c 1 ['N/A'] 2 0 829 187 34 12 0 245 241
Fax3Decode2D /src/libtiff/libtiff/tif_fax3.c 4 ['N/A', 'N/A', 'size_t', 'short'] 2 0 5533 854 210 7 0 243 227
_TIFFVSetField /src/libtiff/libtiff/tif_dir.c 3 ['N/A', 'int', 'N/A'] 6 0 4347 600 179 37 0 393 215
decode_mcu /src/libjpeg-turbo/src/jdhuff.c 2 ['N/A', 'N/A'] 3 0 143 30 13 5 0 183 183
gtTileSeparate /src/libtiff/libtiff/tif_getimage.c 4 ['N/A', 'N/A', 'int', 'int'] 16 0 891 117 40 82 0 659 175

Implementing fuzzers that target the above functions will improve reachability such that it becomes:

Functions statically reachable by fuzzers
41.0%
620 / 1495
Cyclomatic complexity statically reachable by fuzzers
52.0%
7329 / 14025

All functions overview

If you implement fuzzers for these functions, the status of all functions in the project will be:

Func name Functions filename Args Function call depth Reached by Fuzzers Runtime reached by Fuzzers Combined reached by Fuzzers Fuzzers runtime hit Func lines hit % I Count BB Count Cyclomatic complexity Functions reached Reached by functions Accumulated cyclomatic complexity Undiscovered complexity

Runtime coverage analysis

This section shows analysis of runtime coverage data.

For futher technical details on how this section is generated, please see the Glossary .

Complex functions with low coverage

Func name Function total lines Lines covered at runtime percentage covered Reached by fuzzers
jsimd_ycc_rgb_convert 44 13 29.54% ['tiff_read_rgba_fuzzer']
output_pass_setup 45 10 22.22% ['tiff_read_rgba_fuzzer']
start_pass 173 39 22.54% ['tiff_read_rgba_fuzzer']
jinit_color_deconverter 160 58 36.25% ['tiff_read_rgba_fuzzer']
null_convert 49 21 42.85% ['tiff_read_rgba_fuzzer']
j12init_color_deconverter 151 34 22.51% ['tiff_read_rgba_fuzzer']
j16init_color_deconverter 151 30 19.86% ['tiff_read_rgba_fuzzer']
jpeg_core_output_dimensions 130 32 24.61% ['tiff_read_rgba_fuzzer']
use_merged_upsample 38 6 15.78% ['tiff_read_rgba_fuzzer']
jinit_d_post_controller 39 20 51.28% ['tiff_read_rgba_fuzzer']
j12init_d_post_controller 40 20 50.0% ['tiff_read_rgba_fuzzer']
j16init_upsampler 81 40 49.38% ['tiff_read_rgba_fuzzer']
access_virt_sarray 59 31 52.54% ['tiff_read_rgba_fuzzer']
TIFFVGetFieldDefaulted 147 44 29.93% ['tiff_read_rgba_fuzzer']
_TIFFVGetField 327 103 31.49% ['tiff_read_rgba_fuzzer']
_TIFFCheckDirNumberAndOffset 126 34 26.98% ['tiff_read_rgba_fuzzer']
CalcFinalIFDdatasizeReading 51 3 5.882% ['tiff_read_rgba_fuzzer']
TIFFFetchDirectory 268 105 39.17% ['tiff_read_rgba_fuzzer']
TIFFReadDirEntryDouble 86 24 27.90% ['tiff_read_rgba_fuzzer']
TIFFReadDirEntrySbyteArray 177 28 15.81% ['tiff_read_rgba_fuzzer']
TIFFReadDirEntrySshortArray 165 28 16.96% ['tiff_read_rgba_fuzzer']
TIFFReadDirEntrySlongArray 159 26 16.35% ['tiff_read_rgba_fuzzer']
TIFFReadDirEntrySlong8Array 148 24 16.21% ['tiff_read_rgba_fuzzer']
_TIFFGetStrileOffsetOrByteCountValue 34 14 41.17% ['tiff_read_rgba_fuzzer']
_TIFFFillStrilesInternal 34 6 17.64% ['tiff_read_rgba_fuzzer']
TIFFRGBAImageGet 33 10 30.30% ['tiff_read_rgba_fuzzer']
TIFFHashSetInsert 37 16 43.24% ['tiff_read_rgba_fuzzer']
TIFFInitJPEG 44 18 40.90% ['tiff_read_rgba_fuzzer']
JPEGInitializeLibJPEG 38 10 26.31% ['tiff_read_rgba_fuzzer']
LogLuvVSetField 54 24 44.44% ['tiff_read_rgba_fuzzer']
LZMAStrerror 31 9 29.03% ['tiff_read_rgba_fuzzer']
OJPEGVGetField 40 15 37.5% ['tiff_read_rgba_fuzzer']
_TIFFcallocExt 31 6 19.35% ['tiff_read_rgba_fuzzer']
_TIFFreallocExt 37 6 16.21% ['tiff_read_rgba_fuzzer']
TIFFClientOpenExt 333 155 46.54% ['tiff_read_rgba_fuzzer']
horizontalAccumulate12 71 19 26.76% ['tiff_read_rgba_fuzzer']
horizontalAccumulate11 58 15 25.86% ['tiff_read_rgba_fuzzer']
PixarLogVSetField 56 11 19.64% ['tiff_read_rgba_fuzzer']
TIFFFillStrip 119 58 48.73% ['tiff_read_rgba_fuzzer']
TIFFFillTile 111 58 52.25% ['tiff_read_rgba_fuzzer']
TIFFReadRawStrip1 57 25 43.85% ['tiff_read_rgba_fuzzer']
_tiffisSeekProc(void*,unsignedlong,int) 33 16 48.48% ['tiff_read_rgba_fuzzer']
TIFFCheckTile 31 15 48.38% ['tiff_read_rgba_fuzzer']
ZIPVSetField 51 9 17.64% ['tiff_read_rgba_fuzzer']

Files and Directories in report

This section shows which files and directories are considered in this report. The main reason for showing this is fuzz introspector may include more code in the reasoning than is desired. This section helps identify if too many files/directories are included, e.g. third party code, which may be irrelevant for the threat model. In the event too much is included, fuzz introspector supports a configuration file that can exclude data from the report. See the following link for more information on how to create a config file: link

Files in report

Source file Reached by Covered by
[] []
/src/libtiff/libtiff/tif_unix.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/wrapper/../jcapistd.c [] []
/src/libjpeg-turbo/src/jfdctflt.c [] []
/src/libjpeg-turbo/src/wrapper/../jidctred.c [] []
/src/libjpeg-turbo/src/wrapper/../jdsample.c [] []
/src/libtiff/libtiff/tif_error.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_packbits.c [] []
/src/zlib/adler32.c [] []
/src/libtiff/libtiff/tif_jbig.c [] []
/src/libjpeg-turbo/src/wrapper/../jclossls.c [] []
/src/libtiff/libtiff/tif_dirinfo.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_dumpmode.c [] []
/src/libtiff/libtiff/tif_dir.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/usr/local/bin/../include/c++/v1/stdexcept [] []
/src/libjpeg-turbo/src/jdmarker.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/jmemmgr.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_fax3.c [] []
/src/zlib/inflate.c [] []
/src/libtiff/libtiff/tif_read.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_thunder.c [] []
/src/libtiff/libtiff/tif_lzma.c [] []
/src/libjpeg-turbo/simd/x86_64/jsimd.c [] []
/src/libjpeg-turbo/src/jdapimin.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/zlib/inftrees.c [] []
/src/libjpeg-turbo/src/wrapper/../jcprepct.c [] []
/src/libjpeg-turbo/src/jdinput.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/wrapper/../jdpostct.c [] []
/src/libjpeg-turbo/src/wrapper/../jdcolor.c [] []
/src/libjpeg-turbo/src/jdarith.c [] []
/src/libtiff/libtiff/tif_stream.cxx ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_next.c [] []
/src/libjpeg-turbo/src/jdmaster.c [] []
/src/libtiff/libtiff/tif_flush.c ['tiff_read_rgba_fuzzer'] []
/src/libjpeg-turbo/src/wrapper/../jfdctfst.c [] []
/src/libjpeg-turbo/src/jcphuff.c [] []
/src/libjpeg-turbo/src/jdlhuff.c [] []
/src/libtiff/libtiff/tif_open.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/jcomapi.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_getimage.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/jchuff.c [] []
/src/libjpeg-turbo/src/jstdhuff.c [] []
/src/libtiff/libtiff/tif_aux.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/wrapper/../jccoefct.c [] []
/src/libtiff/libtiff/tif_warning.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_close.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_hash_set.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/jcmarker.c [] []
/src/libtiff/libtiff/tif_predict.c [] []
/src/libtiff/libtiff/tif_write.c ['tiff_read_rgba_fuzzer'] []
/src/libtiff/libtiff/tif_swab.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/jclhuff.c [] []
/src/libjpeg-turbo/src/jdphuff.c [] []
/src/libtiff/libtiff/tif_pixarlog.c [] []
/src/libtiff/contrib/oss-fuzz/tiff_read_rgba_fuzzer.cc ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/zlib/crc32.c [] []
/src/libjpeg-turbo/src/jdhuff.c [] []
/src/libjpeg-turbo/src/wrapper/../jcsample.c [] []
/src/libtiff/libtiff/tif_color.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_zip.c [] []
/src/zlib/deflate.c [] []
/src/libjpeg-turbo/src/wrapper/../jidctfst.c [] []
/src/libtiff/libtiff/tif_lzw.c [] []
/src/libjpeg-turbo/src/wrapper/../jidctflt.c [] []
/src/libjpeg-turbo/src/wrapper/../jcdctmgr.c [] []
/src/libjpeg-turbo/src/wrapper/../jdmainct.c [] []
/src/libjpeg-turbo/src/jcinit.c [] []
/src/libjpeg-turbo/src/wrapper/../jquant2.c [] []
/src/libjpeg-turbo/src/wrapper/../jdmainct.h [] []
/src/libtiff/libtiff/tif_luv.c [] []
/src/zlib/zutil.c [] []
/src/libjpeg-turbo/src/jcarith.c [] []
/src/libjpeg-turbo/src/wrapper/../jutils.c [] []
/src/libjpeg-turbo/src/wrapper/../jddiffct.c [] []
/src/libjpeg-turbo/src/wrapper/../jquant1.c [] []
/src/libjpeg-turbo/src/wrapper/../jccolor.c [] []
/src/libtiff/libtiff/tif_strip.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_jpeg.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/wrapper/../jcdiffct.c [] []
/src/libjpeg-turbo/src/jcmaster.c [] []
/src/libtiff/libtiff/tif_ojpeg.c [] []
/src/libjpeg-turbo/src/jerror.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_compress.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/wrapper/../jdmerge.c [] []
/src/libtiff/libtiff/tif_dirread.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/jcparam.c [] []
/src/libjpeg-turbo/src/wrapper/../jdcoefct.c [] []
/src/zlib/inffast.c [] []
/src/libjpeg-turbo/src/wrapper/../jcmainct.c [] []
/src/libtiff/libtiff/tif_dirwrite.c ['tiff_read_rgba_fuzzer'] []
/src/libjpeg-turbo/src/wrapper/../jdapistd.c [] []
/src/libtiff/libtiff/tif_tile.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/wrapper/../jfdctint.c [] []
/src/libjpeg-turbo/src/wrapper/../jidctint.c [] []
/src/libjpeg-turbo/src/wrapper/../jddctmgr.c [] []
/src/zlib/trees.c [] []
/src/libjpeg-turbo/src/jcapimin.c [] []
/src/libjpeg-turbo/src/jmemnobs.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libtiff/libtiff/tif_codec.c ['tiff_read_rgba_fuzzer'] ['tiff_read_rgba_fuzzer']
/src/libjpeg-turbo/src/wrapper/../jdlossls.c [] []

Directories in report

Directory
/src/libjpeg-turbo/src/
/src/zlib/
/src/libjpeg-turbo/simd/x86_64/
/src/libtiff/libtiff/
/src/libtiff/contrib/oss-fuzz/
/usr/local/bin/../include/c++/v1/
/src/libjpeg-turbo/src/wrapper/../