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: fuzz_encryption

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 1893 98.0%
gold [1:9] 0 0.0%
yellow [10:29] 0 0.0%
greenyellow [30:49] 0 0.0%
lawngreen 50+ 37 1.91%
All colors 1930 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
586 1340 ...fuzz_encryption.TestInputOne call site: 01340 pypdf._writer.PdfWriter.generate_file_identifiers
536 539 pypdf.generic._utils.create_string_object call site: 00539 pypdf.generic._data_structures.ArrayObject.read_from_stream
261 3 ...fuzz_encryption.TestInputOne call site: 00003 pypdf._reader.PdfReader.__init__
146 391 pypdf._crypt_providers._fallback.CryptRC4.encrypt call site: 00391 pypdf._reader.PdfReader.read
140 1101 pypdf._writer.PdfWriter.__init__ call site: 01101 pypdf._writer.PdfWriter.clone_document_from_reader
123 266 pypdf._writer.PdfWriter.get_object call site: 00266 pypdf._utils.read_non_whitespace
64 1271 ...fuzz_encryption.TestInputOne call site: 01271 pypdf._writer.PdfWriter._add_object
11 1089 pypdf._writer.PdfWriter.__init__._get_clone_from call site: 01089 .isinstance
6 1245 pypdf._writer.PdfWriter.__init__ call site: 01245 pypdf.generic._base.TextStringObject.get_original_bytes
5 1079 pypdf._writer.PdfWriter._add_object call site: 01079 pypdf._writer.PdfWriter._add_object
4 1252 pypdf.generic._base.encode_pdfdocencoding call site: 01252 pypdf.generic._base.TextStringObject.get_original_bytes
2 1258 pypdf._writer.PdfWriter.add_metadata call site: 01258 typing.cast.get_object

Runtime coverage analysis

Covered functions
178
Functions that are reachable but not covered
368
Reachable functions
410
Percentage of reachable functions covered
10.24%
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.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
/ 1
...fuzz_encryption 11
pypdf._writer 124
pypdf._reader 86
pypdf._utils 21
pypdf.generic._data_structures 88
pypdf.generic._base 38
pypdf._encryption 88
pypdf._crypt_providers._cryptography 17
pypdf._crypt_providers._fallback 7
pypdf._crypt_providers._pycryptodome 7
pypdf.generic._utils 26
pypdf._doc_common 9
pypdf._page 9
pypdf.generic 1
pypdf.filters 58

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
pypdf._writer.PdfWriter.append pypdf._writer 6 ['N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A'] 50 0 3 4 5 296 0 1045 243
pypdf._writer.PdfWriter.update_page_form_field_values pypdf._writer 6 ['N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A'] 8 0 8 21 11 152 1 532 220
pypdf._page.VirtualListImages.__getitem__ pypdf._page 2 ['N/A', 'N/A'] 9 0 0 5 5 149 0 516 220
pypdf._text_extraction._layout_mode._fixed_width_page.text_show_operations pypdf._text_extraction._layout_mode._fixed_width_page 4 ['N/A', 'N/A', 'N/A', 'N/A'] 5 0 10 6 5 49 0 163 115
pypdf._page.PageObject.extract_text pypdf._page 9 ['N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A'] 11 0 2 13 8 145 0 498 83
pypdf._page.PageObject._merge_page pypdf._page 6 ['N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A'] 7 0 12 9 7 123 5 417 77
pypdf._doc_common.PdfDocCommon.get_form_text_fields pypdf._doc_common 2 ['N/A', 'N/A'] 5 0 1 3 4 36 0 122 76
pypdf.generic._data_structures.ContentStream._parse_content_stream pypdf.generic._data_structures 2 ['N/A', 'N/A'] 50 0 5 4 5 179 1 641 64
pypdf._writer.PdfWriter.remove_text pypdf._writer 2 ['N/A', 'N/A'] 7 0 3 4 5 112 0 385 54
pypdf.generic._data_structures.DictionaryObject._clone pypdf.generic._data_structures 6 ['N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A'] 1 0 4 11 7 18 0 61 37

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

Functions statically reachable by fuzzers
39.0%
307 / 797
Cyclomatic complexity statically reachable by fuzzers
44.0%
1308 / 2950

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
pypdf._writer.PdfWriter.__init__._get_clone_from 37 17 45.94% ['fuzz_encryption']
pypdf._writer.PdfWriter._update_field_annotation 68 1 1.470% ['fuzz_encryption']
pypdf._writer.PdfWriter.update_page_form_field_values 56 0 0.0% []
pypdf._writer.PdfWriter._write_increment 34 0 0.0% ['fuzz_encryption']
pypdf._writer.PdfWriter.compress_identical_objects.replace_in_obj 39 0 0.0% []
pypdf._writer.PdfWriter.remove_objects_from_page.clean_forms 40 0 0.0% []
pypdf._writer.PdfWriter.merge._process_named_dests 53 0 0.0% []
pypdf._writer.PdfWriter._insert_filtered_annotations 36 0 0.0% []
pypdf._reader.PdfReader.get_object 75 0 0.0% ['fuzz_encryption']
pypdf._reader.PdfReader.read 41 0 0.0% ['fuzz_encryption']
pypdf._reader.PdfReader._read_standard_xref_table 75 0 0.0% ['fuzz_encryption']
pypdf._reader.PdfReader._rebuild_xref_table 39 0 0.0% ['fuzz_encryption']
pypdf.generic._data_structures.DictionaryObject._clone 50 0 0.0% []
pypdf.generic._data_structures.DictionaryObject.read_from_stream.read_unsized_from_stream 101 0 0.0% ['fuzz_encryption']
pypdf.generic._data_structures.TreeObject.insert_child 38 0 0.0% []
pypdf.generic._data_structures.ContentStream._read_inline_image 51 0 0.0% []
pypdf.generic._data_structures.read_object 40 2 5.0% ['fuzz_encryption']
pypdf.generic._data_structures.Destination.__init__ 32 0 0.0% ['fuzz_encryption']
pypdf._doc_common.PdfDocCommon._get_named_destinations 46 0 0.0% []
pypdf._doc_common.PdfDocCommon.get_pages_showing_field._get_inherited 39 2 5.128% ['fuzz_encryption']
pypdf._doc_common.PdfDocCommon._build_outline_item 46 0 0.0% []
pypdf._doc_common.PdfDocCommon._flatten 36 0 0.0% ['fuzz_encryption']
pypdf._page.PageObject._merge_resources.compute_unique_key 33 0 0.0% []
pypdf._page.PageObject._merge_page 51 0 0.0% []
pypdf._page.PageObject._merge_page_writer 70 0 0.0% []
pypdf._page.PageObject._extract_text 74 0 0.0% []
pypdf._page._VirtualList.__delitem__ 36 0 0.0% []
pypdf._cmap._parse_encoding 40 0 0.0% []
pypdf._cmap.parse_bfrange 35 0 0.0% []
pypdf._cmap.build_font_width_map 60 0 0.0% []
pypdf._encryption.Encryption.write_entry 36 0 0.0% ['fuzz_encryption']
pypdf._encryption.Encryption.read 40 0 0.0% ['fuzz_encryption']
Crypto.Util.Padding.pad.encode 36 4 11.11% ['fuzz_encryption']
Crypto.Cipher.ARC4.ARC4Cipher 36 10 27.77% ['fuzz_encryption']
Crypto.Cipher.AES.new 59 29 49.15% ['fuzz_encryption']
pypdf.filters.FlateDecode.decode 36 0 0.0% ['fuzz_encryption']
pypdf.filters.FlateDecode._decode_png_prediction 46 0 0.0% ['fuzz_encryption']
pypdf.filters.decode_stream_data 38 0 0.0% ['fuzz_encryption']
pypdf.filters._xobj_to_image._apply_alpha 76 0 0.0% []
pypdf._text_extraction.crlf_space_check 37 0 0.0% []
pypdf._text_extraction._layout_mode._fixed_width_page.recurs_to_target_op 84 0 0.0% []
pypdf.generic._image_inline.extract_inline_AHx 31 0 0.0% []
pypdf.generic._image_inline.extract_inline_default 32 0 0.0% []
pypdf._text_extraction._layout_mode._font.Font.__post_init__ 34 0 0.0% []
pypdf.generic._utils.read_string_from_stream 43 0 0.0% ['fuzz_encryption']
pypdf.generic._utils.create_string_object 45 2 4.444% ['fuzz_encryption']
pypdf._codecs._codecs.LzwCodec.decode 34 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
[] []
warnings [] []
pypdf.generic._rectangle [] []
itertools [] []
pypdf._codecs.symbol [] []
zlib [] []
uuid [] []
pypdf._text_extraction._layout_mode._font_widths [] []
pypdf._codecs.adobe_glyphs [] []
pypdf.xmp [] []
_codecs [] []
pypdf._xobj_image_helpers [] []
pathlib [] []
pypdf.generic._files [] []
pypdf.generic._utils ['fuzz_encryption'] []
pypdf._protocols [] []
xml [] []
os [] []
pypdf._page_labels [] []
pypdf.generic._image_inline [] []
pypdf._text_extraction._text_extractor [] []
pypdf.papersizes [] []
pypdf.annotations._base [] []
pypdf._crypt_providers [] []
pypdf.generic._data_structures ['fuzz_encryption'] []
pypdf._codecs.pdfdoc [] []
re [] []
pypdf._utils ['fuzz_encryption'] []
pypdf._doc_common ['fuzz_encryption'] []
pypdf.annotations._markup_annotations [] []
pypdf._writer ['fuzz_encryption'] []
atheris [] []
logging [] []
crlf_space_check [] []
get_text_operands [] []
typing [] []
cryptography [] []
tempfile [] []
datetime [] []
pypdf.generic._fit [] []
json [] []
base64 [] []
...fuzz_encryption ['fuzz_encryption'] []
pypdf._text_extraction._layout_mode._text_state_params [] []
pypdf [] []
pypdf._codecs [] []
enum [] []
struct [] []
hashlib [] []
dataclasses [] []
pypdf._text_extraction._layout_mode._fixed_width_page [] []
pypdf.generic._viewerpref [] []
pypdf._codecs._codecs [] []
pypdf.types [] []
get_display_str [] []
pypdf._merger [] []
pypdf.pagerange [] []
pypdf._text_extraction [] []
pypdf._text_extraction._layout_mode [] []
pypdf._reader ['fuzz_encryption'] []
pypdf._text_extraction._layout_mode._font [] []
pypdf._crypt_providers._base [] []
[] []
pypdf._version [] []
pypdf._crypt_providers._pycryptodome ['fuzz_encryption'] []
pypdf._codecs.std [] []
pypdf.annotations._non_markup_annotations [] []
pypdf._cmap [] []
shutil [] []
pypdf._crypt_providers._fallback ['fuzz_encryption'] []
Crypto [] []
io [] []
pypdf.errors [] []
pypdf._page ['fuzz_encryption'] []
subprocess [] []
pypdf.constants [] []
pypdf.annotations [] []
pypdf.generic ['fuzz_encryption'] []
pypdf._encryption ['fuzz_encryption'] []
secrets [] []
PIL [] []
pypdf._codecs.zapfding [] []
math [] []
binascii [] []
decimal [] []
collections [] []
pypdf._text_extraction._layout_mode._text_state_manager [] []
pypdf.generic._outline [] []
pypdf.generic._base ['fuzz_encryption'] []
pypdf.filters ['fuzz_encryption'] []
pypdf._crypt_providers._cryptography ['fuzz_encryption'] []
mult [] []

Directories in report

Directory