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

Fuzzer details

Fuzzer: fuzz_guesser

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 13 30.9%
gold [1:9] 0 0.0%
yellow [10:29] 0 0.0%
greenyellow [30:49] 0 0.0%
lawngreen 50+ 29 69.0%
All colors 42 100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked Calltree index Parent function Callsite Largest blocked function
8 4 pygments.lexers.guess_lexer call site: 00004 pygments.util.guess_decode
2 34 pygments.plugin.iter_entry_points call site: 00034 pkg_resources.iter_entry_points.load
1 23 pygments.lexers.get_lexer_by_name call site: 00023 pygments.lexers._load_lexers
1 28 pygments.plugin.find_plugin_lexers call site: 00028 pkg_resources.iter_entry_points
1 32 pygments.plugin.iter_entry_points call site: 00032 importlib_metadata.entry_points.select

Runtime coverage analysis

Covered functions
663
Functions that are reachable but not covered
27
Reachable functions
34
Percentage of reachable functions covered
20.59%
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
/ 1
...fuzz_guesser 3
pygments.lexers 15
pygments.util 2
pygments.modeline 6
pygments.plugin 8

Fuzzer: fuzz_lexers

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 0 285 89.6%
gold [1:9] 0 0.0%
yellow [10:29] 0 0.0%
greenyellow [30:49] 0 0.0%
lawngreen 50+ 33 10.3%
All colors 318 100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked Calltree index Parent function Callsite Largest blocked function
197 26 ...fuzz_lexers.TestOneInput call site: 00026 pygments.lex
73 244 pygments.util.get_list_opt call site: 00244 pygments.lexers.erlang.ElixirLexer.get_tokens_unprocessed
5 226 pygments.util.get_bool_opt call site: 00226 .isinstance
2 2 ...fuzz_lexers.TestOneInput call site: 00002 pygments.lexers.get_lexer_by_name
2 17 pygments.plugin.iter_entry_points call site: 00017 pkg_resources.iter_entry_points.load
1 0 EP call site: 00000 .len
1 6 pygments.lexers.get_lexer_by_name call site: 00006 pygments.lexers._load_lexers
1 11 pygments.plugin.find_plugin_lexers call site: 00011 pkg_resources.iter_entry_points
1 15 pygments.plugin.iter_entry_points call site: 00015 importlib_metadata.entry_points.select
1 24 ...fuzz_lexers.TestOneInput call site: 00024 fdp.ConsumeUnicode
1 241 pygments.util.get_list_opt call site: 00241 val.split

Runtime coverage analysis

Covered functions
663
Functions that are reachable but not covered
106
Reachable functions
123
Percentage of reachable functions covered
13.82%
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
/ 1
...fuzz_lexers 9
pygments.lexers 6
pygments.plugin 8
pygments 11
pygments.lexer 40
pygments.util 9
pygments.lexers.scripting 9
pygments.lexers.haskell 7
pygments.lexers.dylan 8
pygments.lexers.php 8
pygments.lexers.lilypond 1
pygments.lexers.erlang 7
pygments.lexers.pascal 12
pygments.scanner 7
pygments.formatters.latex 10
pygments.lexers.data 3
pygments.lexers.templates 8
pygments.filters 2
pygments.filter 2
pygments.formatters.terminal 10
pygments.formatter 3
pygments.console 1
pygments.formatters.terminal256 7

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
pygments.cmdline.main_inner pygments.cmdline 2 ['N/A', 'N/A'] 6 0 37 53 24 234 3 860 393
pygments.lexers.robotframework.RowTokenizer.tokenize pygments.lexers.robotframework 2 ['N/A', 'N/A'] 6 0 2 2 4 66 1 212 197
pygments.formatters.html.HtmlFormatter.format_unencoded pygments.formatters.html 3 ['N/A', 'N/A', 'N/A'] 2 0 2 7 6 56 0 192 162
pygments.lexers.templates.JspLexer.analyse_text pygments.lexers.templates 1 ['N/A'] 3 0 0 2 4 44 0 144 126
pygments.formatters.img.ImageFormatter.__init__ pygments.formatters.img 2 ['N/A', 'N/A'] 3 0 3 3 4 58 0 189 97
pygments.sphinxext.PygmentsDoc.run pygments.sphinxext 1 ['N/A'] 2 0 2 4 5 42 0 134 80
pygments.formatters.img.ImageFormatter.format pygments.formatters.img 3 ['N/A', 'N/A', 'N/A'] 3 0 8 2 4 35 0 113 77

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

Functions statically reachable by fuzzers
25.0%
220 / 876
Cyclomatic complexity statically reachable by fuzzers
27.0%
850 / 3149

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 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
x.startswith 444 20 4.504% []
pygments.lexer.Lexer.get_tokens 32 0 0.0% ['fuzz_lexers']
pygments.lexer.RegexLexer.get_tokens_unprocessed 43 2 4.651% ['fuzz_lexers']
pygments.lexer.ExtendedRegexLexer.get_tokens_unprocessed 48 0 0.0% []
pygments.lexer.do_insertions 41 2 4.878% ['fuzz_lexers']
pygments.lexers.dylan.DylanLexer.get_tokens_unprocessed 32 16 50.0% ['fuzz_lexers']
pygments.lexers.pascal.DelphiLexer.get_tokens_unprocessed 169 0 0.0% ['fuzz_lexers']
pygments.lexers.scripting.EasytrieveLexer.analyse_text.isEmptyLine 54 26 48.14% []
pygments.lexers.haskell.LiterateLexer.get_tokens_unprocessed 38 6 15.78% []
pygments.lexers.data.JsonLexer.get_tokens_unprocessed 154 14 9.090% ['fuzz_lexers']
pygments.lexers.templates.ErbLexer.get_tokens_unprocessed 49 0 0.0% []
pygments.lexers.ruby.RubyLexer.heredoc_callback 32 0 0.0% []
pygments.lexers.shell.ShellSessionBaseLexer.get_tokens_unprocessed 76 35 46.05% []
pygments.lexers.tnt.TNTLexer.get_tokens_unprocessed 66 0 0.0% []
pygments.lexers.sql.PostgresConsoleLexer.get_tokens_unprocessed 46 15 32.60% []
pygments.lexers.rebol.RedLexer.word_callback 33 1 3.030% []
pygments.lexers.lisp.CommonLispLexer.get_tokens_unprocessed 39 14 35.89% []
pygments.lexers.lisp.EmacsLispLexer.get_tokens_unprocessed 42 20 47.61% []
pygments.lexers.lisp.ShenLexer._process_declaration 32 0 0.0% []
pygments.lexers.markup.RstLexer._handle_sourcecode 33 4 12.12% []
pygments.lexers.markup.WikitextLexer.handle_score 35 16 45.71% []
pygments.lexers.perl.Perl6Lexer.brackets_callback.callback 34 1 2.941% []
pygments.lexers.matlab.MatlabSessionLexer.get_tokens_unprocessed 46 14 30.43% []
pygments.lexers.julia.JuliaConsoleLexer.get_tokens_unprocessed 32 0 0.0% []
pygments.lexers.crystal.CrystalLexer.heredoc_callback 32 0 0.0% []
pygments.lexers.modula2.Modula2Lexer.get_tokens_unprocessed 69 0 0.0% []
pygments.lexers.mime.MIMELexer.get_body_tokens 31 0 0.0% []

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
[] []
pygments.styles.paraiso_light [] []
pygments.lexers.minecraft [] []
pygments.lexers.ul4 [] []
pygments.lexers.graphics [] []
pygments.styles.manni [] []
pygments.lexers._scheme_builtins [] []
pygments.lexers.hexdump [] []
pygments.lexers.tcl [] []
pygments.lexers._csound_builtins [] []
pygments.styles.arduino [] []
pygments.lexers.ooc [] []
pygments.lexers.dsls [] []
pygments.lexers.promql [] []
pygments.formatters.other [] []
pygments.lexers._tsql_builtins [] []
pygments.lexers.webassembly [] []
pygments.lexers.javascript [] []
pygments.lexers.r [] []
pygments.lexers.special [] []
pygments.lexers._vim_builtins [] []
pygments.formatters.latex ['fuzz_lexers'] []
pygments.styles.colorful [] []
pygments.lexers.rdf [] []
pygments.filters ['fuzz_lexers'] []
ctags [] []
pygments.lexers.functional [] []
pygments.lexers.ampl [] []
pygments.lexers.automation [] []
pygments.lexers.oberon [] []
pygments.styles.gruvbox [] []
pygments.lexers.teraterm [] []
pygments.lexers.other [] []
pygments.lexers.amdgpu [] []
pygments.lexers._sourcemod_builtins [] []
pygments.lexers.whiley [] []
pygments.lexers.stata [] []
pygments.lexers.savi [] []
pygments.lexers.praat [] []
string [] []
pygments.lexers.tlb [] []
pygments.lexers.procfile [] []
pygments.lexers.wowtoc [] []
pygments.lexers.spice [] []
pygments.lexers._lua_builtins [] []
pygments.styles.stata_light [] []
pygments.lexers.thingsdb [] []
pygments.lexers.yang [] []
pygments.lexers.graph [] []
pygments.lexers.pascal ['fuzz_lexers'] []
pygments.lexers.sas [] []
pygments.styles.lilypond [] []
pygments.lexers.chapel [] []
pygments.lexers.sieve [] []
pygments.lexers.supercollider [] []
tarfile [] []
pygments.lexers.ruby [] []
pygments.lexers.sgf [] []
pygments.formatters.groff [] []
pygments.lexers.c_like [] []
pygments.lexers.ride [] []
pygments.lexers.apdlexer [] []
operator [] []
shutil [] []
pygments.lexers.business [] []
pygments.lexers._mql_builtins [] []
pygments.lexers.slash [] []
pygments.lexers._lasso_builtins [] []
pygments.lexers.jslt [] []
pprint [] []
math [] []
pygments.lexers.algebra [] []
...fuzz_guesser ['fuzz_guesser'] []
pygments.lexers.webmisc [] []
pygments.styles.rrt [] []
pygments.lexers.fift [] []
pygments.formatter ['fuzz_lexers'] []
pygments.lexers.elm [] []
pygments.lexers.iolang [] []
pygments.lexers.rust [] []
pygments.lexers.dotnet [] []
pygments.cmdline [] []
pygments.lexers.graphql [] []
pygments.lexers.lisp [] []
pygments.lexers.smalltalk [] []
chardet [] []
pygments.lexers.html [] []
pygments.styles.friendly_grayscale [] []
pygments.lexers.nix [] []
pygments.lexers.archetype [] []
sphinx [] []
pygments.lexers.varnish [] []
pygments.lexers._vbscript_builtins [] []
pygments.lexers._julia_builtins [] []
pygments.lexers.elpi [] []
pygments.lexers._stata_builtins [] []
pygments.lexers.func [] []
pygments.styles.emacs [] []
pygments.token [] []
docutils [] []
pygments.util ['fuzz_guesser', 'fuzz_lexers'] []
pygments.lexers._ada_builtins [] []
pygments.styles.murphy [] []
pygments.lexers.capnproto [] []
pygments.lexers.esoteric [] []
pygments.formatters.terminal256 ['fuzz_lexers'] []
pygments.formatters.rtf [] []
pygments.styles.monokai [] []
pygments.styles.bw [] []
pygments.lexers.scripting ['fuzz_lexers'] []
pygments.lexers.wgsl [] []
pygments.lexers.inferno [] []
pygments.lexers.monte [] []
pygments.lexers.dalvik [] []
pygments.lexers._usd_builtins [] []
json [] []
pygments.lexers.jsonnet [] []
importlib_metadata [] []
pygments.lexers.pony [] []
pygments.unistring [] []
pygments.lexers._mysql_builtins [] []
pygments.lexers.csound [] []
pygments.lexers.macaulay2 [] []
pygments.lexers.smv [] []
pygments.lexers.teal [] []
subprocess [] []
pygments.lexers ['fuzz_guesser', 'fuzz_lexers'] []
pygments.lexers.futhark [] []
pygments.lexers.floscript [] []
pygments.lexers.php ['fuzz_lexers'] []
pygments.lexers.gdscript [] []
pygments.styles [] []
pygments.lexers.make [] []
pygments.lexers.devicetree [] []
pygments.lexers.freefem [] []
[] []
pygments.lexers._scilab_builtins [] []
pygments.lexers.x10 [] []
pygments.lexers.bare [] []
pygments.lexers.webidl [] []
bz2 [] []
pygments.lexers.fortran [] []
pygments.lexers.textfmts [] []
pygments.lexers.rnc [] []
ast [] []
_winreg [] []
pygments.lexers.templates ['fuzz_lexers'] []
pygments.lexers.math [] []
pygments.lexers._qlik_builtins [] []
pygments ['fuzz_lexers'] []
pygments.lexers.lilypond ['fuzz_lexers'] []
pygments.styles.default [] []
pygments.lexers.hdl [] []
pygments.lexers.gsql [] []
pygments.lexers.int_fiction [] []
pygments.lexers.roboconf [] []
pygments.lexers.igor [] []
pygments.lexers.felix [] []
re [] []
pygments.lexers.srcinfo [] []
pygments.styles.nord [] []
pygments.lexers.typoscript [] []
pygments.lexers.crystal [] []
pygments.styles.pastie [] []
pygments.lexers.data ['fuzz_lexers'] []
pygments.styles.tango [] []
sys [] []
pygments.lexers.qlik [] []
pygments.lexers.modeling [] []
pygments.lexers.tal [] []
pygments.lexers.parasail [] []
pygments.lexers.ml [] []
atheris [] []
pygments.styles.onedark [] []
pygments.lexers.mosel [] []
pygments.lexers.nit [] []
...fuzz_lexers ['fuzz_lexers'] []
pygments.lexers.bibtex [] []
pygments.lexers.c_cpp [] []
pygments.lexers.nimrod [] []
pygments.styles.paraiso_dark [] []
pygments.lexers.haxe [] []
pygments.styles.algol [] []
pygments.lexers.prolog [] []
pygments.lexers._php_builtins [] []
pygments.styles.xcode [] []
pygments.lexers.perl [] []
pygments.styles.igor [] []
pygments.lexers.shell [] []
pygments.lexers.ada [] []
pygments.styles.stata_dark [] []
pygments.modeline ['fuzz_guesser'] []
pygments.style [] []
importlib [] []
pygments.lexers.jvm [] []
pygments.lexers._cocoa_builtins [] []
pygments.scanner ['fuzz_lexers'] []
pygments.lexers.trafficscript [] []
pygments.lexers.dylan ['fuzz_lexers'] []
pygments.lexers.ptx [] []
pygments.formatters._mapping [] []
pygments.lexers.bdd [] []
pygments.formatters.html [] []
pygments.styles.material [] []
gzip [] []
pygments.lexers.urbi [] []
pygments.lexers.arturo [] []
pygments.lexers._asy_builtins [] []
time [] []
pygments.lexers.resource [] []
unicodedata [] []
pygments.styles.lovelace [] []
pygments.styles.algol_nu [] []
pygments.lexers.comal [] []
pygments.lexers.theorem [] []
pygments.lexers.textedit [] []
pygments.styles.sas [] []
pygments.lexers.apl [] []
pygments.lexers.console [] []
pygments.lexers.cplint [] []
glob [] []
pygments.lexers.haskell ['fuzz_lexers'] []
pygments.lexers.foxpro [] []
pygments.lexers.css [] []
pygments.formatters [] []
pygments.lexers.qvt [] []
pygments.plugin ['fuzz_guesser', 'fuzz_lexers'] []
pygments.lexers.gcodelexer [] []
pygments.regexopt [] []
pygments.lexers.robotframework [] []
pygments.lexers._css_builtins [] []
locale [] []
pygments.lexers.basic [] []
pygments.lexers.asc [] []
pygments.lexers.tnt [] []
pygments.lexers.ambient [] []
pygments.lexers.berry [] []
pygments.lexers.ncl [] []
pygments.lexers.blueprint [] []
pygments.styles.fruity [] []
pygments.lexers.ecl [] []
pygments.lexers.grammar_notation [] []
pygments.lexers.xorg [] []
itertools [] []
pygments.lexers.forth [] []
pygments.lexers.cddl [] []
pygments.styles.staroffice [] []
pygments.lexers.julia [] []
PIL [] []
pygments.lexers.verifpal [] []
argparse [] []
pygments.styles.autumn [] []
pygments.lexers.unicon [] []
pygments.lexers.phix [] []
pygments.lexers._stan_builtins [] []
pygments.styles.rainbow_dash [] []
pygments.styles.trac [] []
pygments.lexers.wren [] []
pygments.lexers._cl_builtins [] []
pygments.lexers.usd [] []
pygments.lexers.configs [] []
functools [] []
pygments.styles.borland [] []
types [] []
pygments.styles.native [] []
pygments.styles.inkpot [] []
pygments.lexers.go [] []
pkg_resources [] []
fnmatch [] []
pygments.lexers.d [] []
pygments.lexers.web [] []
pygments.lexers._postgres_builtins [] []
pygments.lexers.zig [] []
pygments.lexers.maxima [] []
pygments.lexers.rita [] []
pygments.lexers.ezhil [] []
pygments.formatters.svg [] []
pygments.lexers.jmespath [] []
textwrap [] []
pygments.formatters.pangomarkup [] []
pygments.lexer ['fuzz_lexers'] []
pygments.styles.gh_dark [] []
pygments.lexers.carbon [] []
pygments.lexers.sql [] []
pygments.lexers.q [] []
pygments.sphinxext [] []
pygments.lexers._mapping [] []
pygments.lexers.installers [] []
pygments.lexers.scdoc [] []
pygments.lexers.fantom [] []
pygments.lexers.pointless [] []
pygments.lexers.idl [] []
pygments.lexers.diff [] []
pygments.lexers.markup [] []
pygments.lexers.kuin [] []
pygments.formatters.irc [] []
pygments.__main__ [] []
pygments.lexers.sophia [] []
io [] []
pygments.lexers._lilypond_builtins [] []
urllib [] []
pygments.lexers.modula2 [] []
pygments.lexers.text [] []
pygments.lexers.snobol [] []
pygments.styles.perldoc [] []
pygments.formatters.img [] []
pygments.lexers.eiffel [] []
pygments.styles.vs [] []
pygments.filter ['fuzz_lexers'] []
pygments.lexers.agile [] []
traceback [] []
pygments.lexers.dax [] []
os [] []
pygments.styles.solarized [] []
pygments.styles.abap [] []
pygments.styles.vim [] []
pygments.lexers.graphviz [] []
pygments.lexers.clean [] []
pygments.lexers.erlang ['fuzz_lexers'] []
codecs [] []
pygments.lexers.objective [] []
bisect [] []
pygments.styles.zenburn [] []
pygments.lexers.mips [] []
copy [] []
pygments.console ['fuzz_lexers'] []
winreg [] []
pygments.lexers.parsers [] []
pygments.lexers.boa [] []
pygments.lexers.matlab [] []
pygments.lexers.factor [] []
pygments.lexers.actionscript [] []
pygments.lexers.testing [] []
pygments.lexers.python [] []
pygments.lexers.meson [] []
pygments.lexers.pawn [] []
pygments.lexers._openedge_builtins [] []
pygments.lexers.asm [] []
pygments.lexers.smithy [] []
pygments.lexers.verification [] []
pygments.lexers.mime [] []
pygments.formatters.bbcode [] []
pygments.lexers.j [] []
pygments.lexers.compiled [] []
pygments.lexers.rebol [] []
pygments.lexers.email [] []
pygments.lexers.arrow [] []
pygments.lexers.solidity [] []
pygments.styles.friendly [] []
pygments.styles.dracula [] []
pygments.formatters.terminal ['fuzz_lexers'] []

Directories in report

Directory