High level conclusions

Fuzzers reach 99.20% of cyclomatic complexity.

Fuzzers reach 93.0% of all functions.

Fuzzers reach 90.0% code coverage.

Fuzzer libyaml_emitter_fuzzer is blocked:

The runtime code coverage of libyaml_emitter_fuzzer covers 16.66% of its statically reachable code. This means there is some place that blocks the fuzzer to continue exploring more code at run time.

Reachability and coverage overview

Functions statically reachable by fuzzers

186 / 200

Cyclomatic complexity statically reachable by fuzzers

3855 / 3886

Runtime code coverage of functions

180 / 200

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	Fuzzers runtime hit	Func lines hit %	I Count	BB Count	Cyclomatic complexity	Functions reached	Reached by functions	Accumulated cyclomatic complexity	Undiscovered complexity

Fuzzer: libyaml_emitter_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	791	90.9%
gold	[1:9]	4	0.45%
yellow	[10:29]	4	0.45%
greenyellow	[30:49]	1	0.11%
lawngreen	50+	70	8.04%
All colors	870	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
2	2	1 : View List ['yaml_parser_set_parser_error']	2	2	yaml_parser_parse_stream_start	call site: 00057	/src/libyaml/src/parser.c:320
0	2	1 : View List ['yaml_parser_set_reader_error']	0	2	yaml_parser_update_buffer	call site: 00079	/src/libyaml/src/reader.c:463
0	0	None	3838	3934	yaml_parser_fetch_next_token	call site: 00061	/src/libyaml/src/scanner.c:870
0	0	None	14	14	yaml_parser_fetch_stream_start	call site: 00082	/src/libyaml/src/scanner.c:1303
0	0	None	2	2	yaml_parser_stale_simple_keys	call site: 00058	/src/libyaml/src/scanner.c:1073
0	0	None	0	1742	yaml_parser_fetch_more_tokens	call site: 00058	/src/libyaml/src/scanner.c:827
0	0	None	0	1742	yaml_parser_fetch_more_tokens	call site: 00058	/src/libyaml/src/scanner.c:832
0	0	None	0	45	yaml_parser_initialize	call site: 00003	/src/libyaml/src/api.c:182
0	0	None	0	42	yaml_parser_initialize	call site: 00004	/src/libyaml/src/api.c:184
0	0	None	0	39	yaml_parser_initialize	call site: 00005	/src/libyaml/src/api.c:186
0	0	None	0	36	yaml_parser_initialize	call site: 00006	/src/libyaml/src/api.c:188
0	0	None	0	33	yaml_parser_initialize	call site: 00007	/src/libyaml/src/api.c:190

Runtime coverage analysis

Covered functions

26

Functions that are reachable but not covered

130

Reachable functions

156

Percentage of reachable functions covered

16.67%

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
libyaml_emitter_fuzzer.c	3
libyamlapi.c	27
yaml_write_handler.h	1
libyamlparser.c	21
libyamlscanner.c	40
libyamlreader.c	4
libyamlemitter.c	47
libyamlwriter.c	2

Fuzzer: libyaml_scanner_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	18	5.07%
gold	[1:9]	13	3.66%
yellow	[10:29]	9	2.53%
greenyellow	[30:49]	10	2.81%
lawngreen	50+	305	85.9%
All colors	355	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
0	2	1 : View List ['yaml_parser_set_reader_error']	0	2	yaml_parser_update_buffer	call site: 00049	/src/libyaml/src/reader.c:463
0	0	None	0	3744	yaml_parser_fetch_next_token	call site: 00064	/src/libyaml/src/scanner.c:885
0	0	None	0	511	yaml_parser_fetch_directive	call site: 00073	/src/libyaml/src/scanner.c:1374
0	0	None	0	505	yaml_parser_fetch_directive	call site: 00074	/src/libyaml/src/scanner.c:1379
0	0	None	0	392	yaml_parser_fetch_flow_scalar	call site: 00267	/src/libyaml/src/scanner.c:1864
0	0	None	0	348	yaml_parser_fetch_tag	call site: 00206	/src/libyaml/src/scanner.c:1802
0	0	None	0	344	yaml_parser_fetch_plain_scalar	call site: 00309	/src/libyaml/src/scanner.c:1895
0	0	None	0	253	yaml_parser_scan_tag_uri	call site: 00119	/src/libyaml/src/scanner.c:2632
0	0	None	0	193	yaml_parser_fetch_anchor	call site: 00194	/src/libyaml/src/scanner.c:1772
0	0	None	0	50	yaml_parser_fetch_value	call site: 00188	/src/libyaml/src/scanner.c:1699
0	0	None	0	45	yaml_parser_initialize	call site: 00003	/src/libyaml/src/api.c:182
0	0	None	0	42	yaml_parser_initialize	call site: 00004	/src/libyaml/src/api.c:184

Runtime coverage analysis

Covered functions

58

Functions that are reachable but not covered

5

Reachable functions

63

Percentage of reachable functions covered

92.06%

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
libyaml_scanner_fuzzer.c	1
libyamlapi.c	12
libyamlscanner.c	41
libyamlreader.c	4

Fuzzer: libyaml_parser_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	21	4.08%
gold	[1:9]	13	2.52%
yellow	[10:29]	9	1.75%
greenyellow	[30:49]	15	2.91%
lawngreen	50+	456	88.7%
All colors	514	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
0	2	1 : View List ['yaml_parser_set_parser_error']	0	2	yaml_parser_parse_stream_start	call site: 00029	/src/libyaml/src/parser.c:320
0	2	1 : View List ['yaml_parser_set_reader_error']	0	2	yaml_parser_update_buffer	call site: 00051	/src/libyaml/src/reader.c:463
0	0	None	2	27	yaml_parser_parse_node	call site: 00395	/src/libyaml/src/parser.c:609
0	0	None	2	2	yaml_strdup	call site: 00356	/src/libyaml/src/api.c:63
0	0	None	0	8836	yaml_parser_parse_flow_mapping_key	call site: 00469	/src/libyaml/src/parser.c:1107
0	0	None	0	5293	yaml_parser_parse_block_sequence_entry	call site: 00415	/src/libyaml/src/parser.c:733
0	0	None	0	5293	yaml_parser_parse_block_mapping_key	call site: 00431	/src/libyaml/src/parser.c:841
0	0	None	0	5287	yaml_parser_parse_flow_sequence_entry	call site: 00447	/src/libyaml/src/parser.c:956
0	0	None	0	3744	yaml_parser_fetch_next_token	call site: 00066	/src/libyaml/src/scanner.c:885
0	0	None	0	3591	yaml_parser_process_directives	call site: 00348	/src/libyaml/src/parser.c:1248
0	0	None	0	1849	yaml_parser_process_directives	call site: 00352	/src/libyaml/src/parser.c:1273
0	0	None	0	1849	yaml_parser_process_directives	call site: 00362	/src/libyaml/src/parser.c:1289

Runtime coverage analysis

Covered functions

81

Functions that are reachable but not covered

6

Reachable functions

87

Percentage of reachable functions covered

93.1%

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
libyaml_parser_fuzzer.c	1
libyamlapi.c	14
libyamlparser.c	22
libyamlscanner.c	40
libyamlreader.c	4

Fuzzer: libyaml_loader_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	32	5.47%
gold	[1:9]	11	1.88%
yellow	[10:29]	14	2.39%
greenyellow	[30:49]	14	2.39%
lawngreen	50+	513	87.8%
All colors	584	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
0	2	1 : View List ['yaml_parser_set_parser_error']	0	2	yaml_parser_parse_stream_start	call site: 00033	/src/libyaml/src/parser.c:320
0	2	1 : View List ['yaml_parser_set_reader_error']	0	2	yaml_parser_update_buffer	call site: 00055	/src/libyaml/src/reader.c:463
0	0	None	2	27	yaml_parser_parse_node	call site: 00399	/src/libyaml/src/parser.c:609
0	0	None	2	2	yaml_strdup	call site: 00360	/src/libyaml/src/api.c:63
0	0	None	0	8836	yaml_parser_parse_flow_mapping_key	call site: 00473	/src/libyaml/src/parser.c:1107
0	0	None	0	6490	yaml_parser_load	call site: 00027	/src/libyaml/src/loader.c:95
0	0	None	0	5293	yaml_parser_parse_block_sequence_entry	call site: 00419	/src/libyaml/src/parser.c:733
0	0	None	0	5293	yaml_parser_parse_block_mapping_key	call site: 00435	/src/libyaml/src/parser.c:841
0	0	None	0	5287	yaml_parser_parse_flow_sequence_entry	call site: 00451	/src/libyaml/src/parser.c:956
0	0	None	0	3744	yaml_parser_fetch_next_token	call site: 00070	/src/libyaml/src/scanner.c:885
0	0	None	0	3591	yaml_parser_process_directives	call site: 00352	/src/libyaml/src/parser.c:1248
0	0	None	0	2391	yaml_parser_load_nodes	call site: 00535	/src/libyaml/src/loader.c:235

Runtime coverage analysis

Covered functions

96

Functions that are reachable but not covered

6

Reachable functions

102

Percentage of reachable functions covered

94.12%

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
libyaml_loader_fuzzer.c	1
libyamlapi.c	15
libyamlloader.c	14
libyamlparser.c	22
libyamlscanner.c	40
libyamlreader.c	4

Fuzzer: libyaml_reformatter_alt_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	71	7.72%
gold	[1:9]	22	2.39%
yellow	[10:29]	19	2.06%
greenyellow	[30:49]	13	1.41%
lawngreen	50+	794	86.3%
All colors	919	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
24	24	1 : View List ['yaml_emitter_write_bom']	24	24	yaml_emitter_emit_stream_start	call site: 00633	/src/libyaml/src/emitter.c:533
0	75	2 : View List ['yaml_emitter_write_indent', 'yaml_emitter_write_indicator']	0	95	yaml_emitter_emit_document_start	call site: 00686	/src/libyaml/src/emitter.c:666
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_emit_stream_start	call site: 00633	/src/libyaml/src/emitter.c:499
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_analyze_version_directive	call site: 00643	/src/libyaml/src/emitter.c:1355
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_append_tag_directive	call site: 00654	/src/libyaml/src/emitter.c:373
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_emit_document_end	call site: 00786	/src/libyaml/src/emitter.c:708
0	2	1 : View List ['yaml_parser_set_parser_error']	0	2	yaml_parser_parse_stream_start	call site: 00057	/src/libyaml/src/parser.c:320
0	2	1 : View List ['yaml_parser_set_reader_error']	0	2	yaml_parser_update_buffer	call site: 00079	/src/libyaml/src/reader.c:463
0	0	None	24	24	yaml_emitter_emit_stream_start	call site: 00633	/src/libyaml/src/emitter.c:518
0	0	None	4	618	yaml_emitter_emit_document_start	call site: 00643	/src/libyaml/src/emitter.c:566
0	0	None	4	618	yaml_emitter_emit_document_start	call site: 00653	/src/libyaml/src/emitter.c:576
0	0	None	4	562	yaml_emitter_emit_document_start	call site: 00658	/src/libyaml/src/emitter.c:582

Runtime coverage analysis

Covered functions

162

Functions that are reachable but not covered

9

Reachable functions

171

Percentage of reachable functions covered

94.74%

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
libyaml_reformatter_alt_fuzzer.c	1
libyamlapi.c	21
yaml_write_handler.h	1
libyamlloader.c	14
libyamlparser.c	22
libyamlscanner.c	40
libyamlreader.c	4
libyamldumper.c	11
libyamlemitter.c	47
libyamlwriter.c	2

Fuzzer: libyaml_reformatter_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	56	7.05%
gold	[1:9]	24	3.02%
yellow	[10:29]	12	1.51%
greenyellow	[30:49]	13	1.63%
lawngreen	50+	689	86.7%
All colors	794	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
0	75	2 : View List ['yaml_emitter_write_indent', 'yaml_emitter_write_indicator']	0	95	yaml_emitter_emit_document_start	call site: 00600	/src/libyaml/src/emitter.c:666
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_emit_stream_start	call site: 00546	/src/libyaml/src/emitter.c:499
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_analyze_version_directive	call site: 00556	/src/libyaml/src/emitter.c:1355
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_append_tag_directive	call site: 00567	/src/libyaml/src/emitter.c:373
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_emit_document_end	call site: 00701	/src/libyaml/src/emitter.c:708
0	2	1 : View List ['yaml_parser_set_parser_error']	0	2	yaml_parser_parse_stream_start	call site: 00053	/src/libyaml/src/parser.c:320
0	2	1 : View List ['yaml_parser_set_reader_error']	0	2	yaml_parser_update_buffer	call site: 00075	/src/libyaml/src/reader.c:463
0	0	None	4	618	yaml_emitter_emit_document_start	call site: 00556	/src/libyaml/src/emitter.c:566
0	0	None	4	618	yaml_emitter_emit_document_start	call site: 00566	/src/libyaml/src/emitter.c:576
0	0	None	4	562	yaml_emitter_emit_document_start	call site: 00572	/src/libyaml/src/emitter.c:582
0	0	None	4	415	yaml_emitter_emit_document_start	call site: 00580	/src/libyaml/src/emitter.c:605
0	0	None	4	339	yaml_emitter_emit_document_start	call site: 00581	/src/libyaml/src/emitter.c:608

Runtime coverage analysis

Covered functions

136

Functions that are reachable but not covered

7

Reachable functions

143

Percentage of reachable functions covered

95.1%

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
libyaml_reformatter_fuzzer.c	1
libyamlapi.c	19
yaml_write_handler.h	1
libyamlparser.c	22
libyamlscanner.c	40
libyamlreader.c	4
libyamlemitter.c	47
libyamlwriter.c	2

Fuzzer: libyaml_dumper_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	85	8.48%
gold	[1:9]	32	3.19%
yellow	[10:29]	22	2.19%
greenyellow	[30:49]	20	1.99%
lawngreen	50+	843	84.1%
All colors	1002	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
24	24	1 : View List ['yaml_emitter_write_bom']	24	24	yaml_emitter_emit_stream_start	call site: 00088	/src/libyaml/src/emitter.c:533
2	2	1 : View List ['strlen']	2	42	yaml_document_add_scalar	call site: 00881	/src/libyaml/src/api.c:1218
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_emit_stream_start	call site: 00088	/src/libyaml/src/emitter.c:499
0	2	1 : View List ['yaml_emitter_set_emitter_error']	0	2	yaml_emitter_analyze_version_directive	call site: 00098	/src/libyaml/src/emitter.c:1355
0	2	1 : View List ['yaml_parser_set_parser_error']	0	2	yaml_parser_parse_stream_start	call site: 00322	/src/libyaml/src/parser.c:320
0	2	1 : View List ['yaml_parser_set_reader_error']	0	2	yaml_parser_update_buffer	call site: 00344	/src/libyaml/src/reader.c:463
0	0	None	24	24	yaml_emitter_emit_stream_start	call site: 00088	/src/libyaml/src/emitter.c:518
0	0	None	4	618	yaml_emitter_emit_document_start	call site: 00098	/src/libyaml/src/emitter.c:566
0	0	None	4	562	yaml_emitter_emit_document_start	call site: 00115	/src/libyaml/src/emitter.c:582
0	0	None	4	415	yaml_emitter_emit_document_start	call site: 00123	/src/libyaml/src/emitter.c:605
0	0	None	4	339	yaml_emitter_emit_document_start	call site: 00124	/src/libyaml/src/emitter.c:608
0	0	None	4	302	yaml_emitter_emit_document_start	call site: 00126	/src/libyaml/src/emitter.c:615

Runtime coverage analysis

Covered functions

170

Functions that are reachable but not covered

12

Reachable functions

182

Percentage of reachable functions covered

93.41%

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
libyaml_dumper_fuzzer.c	4
libyamlapi.c	29
yaml_write_handler.h	1
libyamldumper.c	11
libyamlemitter.c	47
libyamlwriter.c	2
libyamlloader.c	14
libyamlparser.c	22
libyamlscanner.c	40
libyamlreader.c	4

Fuzzer: libyaml_deconstructor_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	166	16.7%
gold	[1:9]	16	1.61%
yellow	[10:29]	8	0.80%
greenyellow	[30:49]	19	1.91%
lawngreen	50+	784	78.9%
All colors	993	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
24	24	1 : View List ['yaml_emitter_write_bom']	24	24	yaml_emitter_emit_stream_start	call site: 00108	/src/libyaml/src/emitter.c:533
19	19	1 : View List ['yaml_emitter_analyze_anchor']	19	252	yaml_emitter_analyze_event	call site: 00091	/src/libyaml/src/emitter.c:1722
19	19	1 : View List ['yaml_emitter_analyze_anchor']	19	31	yaml_emitter_analyze_event	call site: 00102	/src/libyaml/src/emitter.c:1739
19	19	1 : View List ['yaml_emitter_analyze_anchor']	19	31	yaml_emitter_analyze_event	call site: 00104	/src/libyaml/src/emitter.c:1753
7	7	1 : View List ['yaml_emitter_analyze_version_directive']	33	625	yaml_emitter_emit_document_start	call site: 00117	/src/libyaml/src/emitter.c:565
4	113	3 : View List ['strlen', 'yaml_emitter_write_tag_handle', 'yaml_emitter_write_tag_content']	4	302	yaml_emitter_emit_document_start	call site: 00146	/src/libyaml/src/emitter.c:619
4	86	6 : View List ['yaml_malloc', 'strlen', 'yaml_free', 'yaml_check_utf8', 'yaml_strdup', 'yaml_stack_extend']	4	86	yaml_document_start_event_initialize	call site: 00336	/src/libyaml/src/api.c:732
2	22	2 : View List ['yaml_emitter_set_emitter_error', 'yaml_emitter_flush']	2	97	yaml_emitter_emit_document_start	call site: 00117	/src/libyaml/src/emitter.c:555
2	2	1 : View List ['yaml_emitter_set_emitter_error']	2	2	yaml_emitter_emit_stream_start	call site: 00108	/src/libyaml/src/emitter.c:499
2	2	1 : View List ['yaml_emitter_set_emitter_error']	2	2	yaml_emitter_emit_document_end	call site: 00264	/src/libyaml/src/emitter.c:708
2	2	1 : View List ['yaml_emitter_set_emitter_error']	2	2	yaml_emitter_analyze_tag	call site: 00097	/src/libyaml/src/emitter.c:1468
0	76	1 : View List ['yaml_emitter_write_indicator']	0	151	yaml_emitter_process_tag	call site: 00182	/src/libyaml/src/emitter.c:1283

Runtime coverage analysis

Covered functions

134

Functions that are reachable but not covered

20

Reachable functions

154

Percentage of reachable functions covered

87.01%

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
libyaml_deconstructor_fuzzer.c	1
libyamlapi.c	29
yaml_write_handler.h	1
libyamlemitter.c	47
libyamlwriter.c	2
libyamlparser.c	22
libyamlscanner.c	40
libyamlreader.c	4

Fuzzer: libyaml_deconstructor_alt_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	173	17.1%
gold	[1:9]	11	1.09%
yellow	[10:29]	13	1.28%
greenyellow	[30:49]	12	1.18%
lawngreen	50+	800	79.2%
All colors	1009	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
1238	1238	1 : View List ['yaml_emitter_dump_alias']	1238	1238	yaml_emitter_dump_node	call site: 00970	/src/libyaml/src/dumper.c:275
24	24	1 : View List ['yaml_emitter_write_bom']	24	24	yaml_emitter_emit_stream_start	call site: 00109	/src/libyaml/src/emitter.c:533
19	19	1 : View List ['yaml_emitter_analyze_anchor']	19	252	yaml_emitter_analyze_event	call site: 00092	/src/libyaml/src/emitter.c:1722
19	19	1 : View List ['yaml_emitter_analyze_anchor']	19	31	yaml_emitter_analyze_event	call site: 00103	/src/libyaml/src/emitter.c:1739
19	19	1 : View List ['yaml_emitter_analyze_anchor']	19	31	yaml_emitter_analyze_event	call site: 00105	/src/libyaml/src/emitter.c:1753
8	8	1 : View List ['yaml_emitter_generate_anchor']	1246	5025	yaml_emitter_dump_node	call site: 00969	/src/libyaml/src/dumper.c:270
7	7	1 : View List ['yaml_emitter_analyze_version_directive']	33	625	yaml_emitter_emit_document_start	call site: 00118	/src/libyaml/src/emitter.c:565
4	113	3 : View List ['strlen', 'yaml_emitter_write_tag_handle', 'yaml_emitter_write_tag_content']	4	302	yaml_emitter_emit_document_start	call site: 00147	/src/libyaml/src/emitter.c:619
4	89	6 : View List ['yaml_malloc', 'strlen', 'yaml_free', 'yaml_check_utf8', 'yaml_strdup', 'yaml_stack_extend']	4	89	yaml_document_initialize	call site: 00338	/src/libyaml/src/api.c:1073
2	22	2 : View List ['yaml_emitter_set_emitter_error', 'yaml_emitter_flush']	2	97	yaml_emitter_emit_document_start	call site: 00118	/src/libyaml/src/emitter.c:555
2	2	1 : View List ['yaml_emitter_set_emitter_error']	2	2	yaml_emitter_emit_stream_start	call site: 00109	/src/libyaml/src/emitter.c:499
2	2	1 : View List ['yaml_emitter_set_emitter_error']	2	2	yaml_emitter_emit_document_end	call site: 00265	/src/libyaml/src/emitter.c:708

Runtime coverage analysis

Covered functions

141

Functions that are reachable but not covered

22

Reachable functions

163

Percentage of reachable functions covered

86.5%

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
libyaml_deconstructor_alt_fuzzer.c	1
libyamlapi.c	27
yaml_write_handler.h	1
libyamldumper.c	11
libyamlemitter.c	47
libyamlwriter.c	2
libyamlparser.c	22
libyamlscanner.c	40
libyamlreader.c	4

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

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

Functions statically reachable by fuzzers

186 / 200

Cyclomatic complexity statically reachable by fuzzers

3855 / 3886

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

This sections provides heuristics that can be used as input to a fuzz engine when running a given fuzz target. The current focus is on providing input that is usable by libFuzzer.

libyaml_emitter_fuzzer.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['yaml_parser_fetch_stream_start', 'LLVMFuzzerTestOneInput', 'yaml_stream_start_event_initialize', 'yaml_event_delete', 'yaml_parser_initialize', 'yaml_emitter_initialize', 'yaml_parser_delete', 'yaml_parser_fetch_more_tokens']

libyaml_scanner_fuzzer.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['yaml_parser_initialize', 'yaml_parser_delete', 'yaml_parser_determine_encoding', 'yaml_parser_update_buffer', 'yaml_parser_fetch_directive', 'yaml_parser_fetch_anchor', 'yaml_parser_fetch_tag', 'yaml_parser_fetch_block_scalar', 'yaml_parser_fetch_flow_scalar', 'yaml_parser_fetch_plain_scalar']

libyaml_parser_fuzzer.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['yaml_parser_initialize', 'yaml_parser_append_tag_directive', 'yaml_parser_state_machine', 'yaml_parser_determine_encoding', 'yaml_parser_update_buffer', 'yaml_parser_fetch_directive', 'yaml_parser_fetch_anchor', 'yaml_parser_fetch_tag', 'yaml_parser_fetch_block_scalar', 'yaml_parser_fetch_flow_scalar']

libyaml_loader_fuzzer.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['yaml_parser_initialize', 'yaml_parser_load_scalar', 'yaml_parser_append_tag_directive', 'yaml_parser_state_machine', 'yaml_parser_load_sequence', 'yaml_parser_load_mapping', 'yaml_parser_determine_encoding', 'yaml_parser_update_buffer', 'yaml_parser_fetch_directive', 'yaml_parser_fetch_anchor']

libyaml_reformatter_alt_fuzzer.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['yaml_parser_initialize', 'yaml_emitter_initialize', 'yaml_emitter_analyze_tag_directive', 'yaml_parser_load_scalar', 'yaml_emitter_write_plain_scalar', 'yaml_emitter_emit_document_end', 'yaml_parser_append_tag_directive', 'yaml_parser_state_machine', 'yaml_parser_load_sequence', 'yaml_parser_load_mapping']

libyaml_reformatter_fuzzer.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['yaml_parser_initialize', 'yaml_emitter_initialize', 'yaml_emitter_analyze_tag_directive', 'yaml_emitter_write_plain_scalar', 'yaml_emitter_emit_document_end', 'yaml_parser_append_tag_directive', 'yaml_parser_state_machine', 'yaml_emitter_analyze_anchor', 'yaml_emitter_append_tag_directive', 'yaml_emitter_emit_document_start']

libyaml_dumper_fuzzer.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['LLVMFuzzerTestOneInput', 'yaml_parser_initialize', 'yaml_emitter_initialize', 'yaml_emitter_analyze_tag_directive', 'yaml_emitter_write_plain_scalar', 'yaml_emitter_analyze_anchor', 'yaml_emitter_state_machine', 'yaml_emitter_flush', 'yaml_stack_extend', 'yaml_parser_append_tag_directive']

libyaml_deconstructor_fuzzer.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['yaml_emitter_write_double_quoted_scalar', 'yaml_emitter_state_machine', 'yaml_emitter_write_plain_scalar', 'yaml_document_start_event_initialize', 'yaml_parser_initialize', 'yaml_strdup', 'yaml_emitter_initialize', 'yaml_emitter_write_indent', 'yaml_emitter_emit_document_content', 'yaml_emitter_emit']

libyaml_deconstructor_alt_fuzzer.c

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['yaml_emitter_write_double_quoted_scalar', 'yaml_emitter_state_machine', 'yaml_emitter_write_plain_scalar', 'yaml_document_initialize', 'yaml_strdup', 'yaml_parser_initialize', 'yaml_emitter_initialize', 'yaml_emitter_write_indent', 'yaml_emitter_dump', 'yaml_emitter_emit_document_content']

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
yaml_parser_initialize	31	13	41.93%	['libyaml_emitter_fuzzer', 'libyaml_scanner_fuzzer', 'libyaml_parser_fuzzer', 'libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']
copy_event	43	7	16.27%	['libyaml_emitter_fuzzer']
yaml_document_start_event_initialize	60	22	36.66%	['libyaml_emitter_fuzzer', 'libyaml_deconstructor_fuzzer']

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/libyaml/src/reader.c	['libyaml_emitter_fuzzer', 'libyaml_scanner_fuzzer', 'libyaml_parser_fuzzer', 'libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']	['libyaml_emitter_fuzzer', 'libyaml_scanner_fuzzer', 'libyaml_parser_fuzzer', 'libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']
/src/libyaml/src/emitter.c	['libyaml_emitter_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']	['libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']
/src/libyaml_scanner_fuzzer.c	['libyaml_scanner_fuzzer']	['libyaml_scanner_fuzzer']
/src/libyaml/src/scanner.c	['libyaml_emitter_fuzzer', 'libyaml_scanner_fuzzer', 'libyaml_parser_fuzzer', 'libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']	['libyaml_emitter_fuzzer', 'libyaml_scanner_fuzzer', 'libyaml_parser_fuzzer', 'libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']
/src/libyaml_reformatter_alt_fuzzer.c	['libyaml_reformatter_alt_fuzzer']	['libyaml_reformatter_alt_fuzzer']
/src/libyaml/src/dumper.c	['libyaml_reformatter_alt_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_alt_fuzzer']	['libyaml_reformatter_alt_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_alt_fuzzer']
/src/libyaml_emitter_fuzzer.c	['libyaml_emitter_fuzzer']	['libyaml_emitter_fuzzer']
/src/yaml_write_handler.h	['libyaml_emitter_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']	['libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']
/src/libyaml/src/api.c	['libyaml_emitter_fuzzer', 'libyaml_scanner_fuzzer', 'libyaml_parser_fuzzer', 'libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']	['libyaml_emitter_fuzzer', 'libyaml_scanner_fuzzer', 'libyaml_parser_fuzzer', 'libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']
/src/libyaml/src/writer.c	['libyaml_emitter_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']	['libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']
/src/libyaml_reformatter_fuzzer.c	['libyaml_reformatter_fuzzer']	['libyaml_reformatter_fuzzer']
/src/libyaml/src/parser.c	['libyaml_emitter_fuzzer', 'libyaml_parser_fuzzer', 'libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']	['libyaml_emitter_fuzzer', 'libyaml_parser_fuzzer', 'libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_reformatter_fuzzer', 'libyaml_dumper_fuzzer', 'libyaml_deconstructor_fuzzer', 'libyaml_deconstructor_alt_fuzzer']
/src/libyaml/src/loader.c	['libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_dumper_fuzzer']	['libyaml_loader_fuzzer', 'libyaml_reformatter_alt_fuzzer', 'libyaml_dumper_fuzzer']
/src/libyaml_parser_fuzzer.c	['libyaml_parser_fuzzer']	['libyaml_parser_fuzzer']
/src/libyaml_deconstructor_alt_fuzzer.c	['libyaml_deconstructor_alt_fuzzer']	['libyaml_deconstructor_alt_fuzzer']
/src/libyaml_loader_fuzzer.c	['libyaml_loader_fuzzer']	['libyaml_loader_fuzzer']
/src/libyaml_deconstructor_fuzzer.c	['libyaml_deconstructor_fuzzer']	['libyaml_deconstructor_fuzzer']
/src/libyaml_dumper_fuzzer.c	['libyaml_dumper_fuzzer']	['libyaml_dumper_fuzzer']

Directories in report

Directory
/src/
/src/libyaml/src/