High level conclusions

Fuzzers reach 65.07% code coverage.

Fuzzers reach 57.61% of cyclomatic complexity.

Fuzzers reach 72.22% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

91 / 126

Cyclomatic complexity statically reachable by fuzzers

1355 / 2352

Runtime code coverage of functions

82 / 126

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: asn1_get_object_id_der_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	0	0.0%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	17	100.%
All colors	17	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	0	None	0	0	asn1_get_length_der	call site: 00002	/src/libtasn1/lib/decoding.c:118
0	0	None	0	0	asn1_get_object_id_der	call site: 00001	/src/libtasn1/lib/decoding.c:423
0	0	None	0	0	_asn1_str_cpy	call site: 00005	/src/libtasn1/lib/gstr.c:58

Runtime coverage analysis

Covered functions

6

Functions that are reachable but not covered

4

Reachable functions

10

Percentage of reachable functions covered

60.0%

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
/src/libtasn1/fuzz/asn1_get_object_id_der_fuzzer.c	1
decoding.c	2
parser_aux.c	1
gstr.c	2

Fuzzer: asn1_decode_simple_ber_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	4	17.3%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	19	82.6%
All colors	23	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
104	104	1 : View List ['_asn1_get_indefinite_length_string']	104	104	asn1_get_length_ber	call site: 00009	/src/libtasn1/lib/decoding.c:257
0	0	None	0	0	_asn1_decode_simple_der	call site: 00016	/src/libtasn1/lib/decoding.c:2133
0	0	None	0	0	_asn1_decode_simple_der	call site: 00016	/src/libtasn1/lib/decoding.c:2141
0	0	None	0	0	_asn1_decode_simple_der	call site: 00017	/src/libtasn1/lib/decoding.c:2149
0	0	None	0	0	_asn1_decode_simple_der	call site: 00017	/src/libtasn1/lib/decoding.c:2152
0	0	None	0	0	_asn1_decode_simple_ber	call site: 00002	/src/libtasn1/lib/decoding.c:2259
0	0	None	0	0	_asn1_decode_simple_ber	call site: 00002	/src/libtasn1/lib/decoding.c:2267
0	0	None	0	0	_asn1_decode_simple_ber	call site: 00004	/src/libtasn1/lib/decoding.c:2349
0	0	None	0	0	_asn1_decode_simple_ber	call site: 00004	/src/libtasn1/lib/decoding.c:2427
0	0	1 : View List ['free']	0	0	_asn1_decode_simple_ber	call site: 00004	/src/libtasn1/lib/decoding.c:2463
0	0	None	0	0	append	call site: 00006	/src/libtasn1/lib/decoding.c:2209
0	0	None	0	0	_asn1_realloc	call site: 00006	/src/libtasn1/lib/./int.h:205

Runtime coverage analysis

Covered functions

9

Functions that are reachable but not covered

3

Reachable functions

12

Percentage of reachable functions covered

75.0%

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
/src/libtasn1/fuzz/asn1_decode_simple_ber_fuzzer.c	1
decoding.c	8
./int.h	1

Fuzzer: libtasn1_array2tree_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	4	3.00%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	129	96.9%
All colors	133	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
3	3	1 : View List ['safe_memset']	3	3	_asn1_remove_node	call site: 00019	/src/libtasn1/lib/parser_aux.c:512
2	2	1 : View List ['strcpy']	2	2	_asn1_check_identifier	call site: 00040	/src/libtasn1/lib/parser_aux.c:1043
0	0	None	0	39	_asn1_delete_structure	call site: 00021	/src/libtasn1/lib/structure.c:350
0	0	None	0	0	asn1_length_der	call site: 00081	/src/libtasn1/lib/coding.c:81
0	0	None	0	0	asn1_octet_der	call site: 00080	/src/libtasn1/lib/coding.c:176
0	0	None	0	0	_asn1_convert_integer	call site: 00079	/src/libtasn1/lib/element.c:114
0	0	None	0	0	_asn1_str_cpy	call site: 00010	/src/libtasn1/lib/gstr.c:58
0	0	None	0	0	_asn1_add_static_node	call site: 00007	/src/libtasn1/lib/parser_aux.c:72
0	0	1 : View List ['free']	0	0	_asn1_add_static_node	call site: 00007	/src/libtasn1/lib/parser_aux.c:76
0	0	None	0	0	asn1_find_node	call site: 00040	/src/libtasn1/lib/parser_aux.c:131
0	0	None	0	0	asn1_find_node	call site: 00040	/src/libtasn1/lib/parser_aux.c:134
0	0	None	0	0	asn1_find_node	call site: 00042	/src/libtasn1/lib/parser_aux.c:152

Runtime coverage analysis

Covered functions

32

Functions that are reachable but not covered

10

Reachable functions

42

Percentage of reachable functions covered

76.19%

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
/src/libtasn1/fuzz/libtasn1_array2tree_fuzzer.c	1
structure.c	5
./int.h	2
parser_aux.c	16
gstr.c	2
./parser_aux.h	1
./gstr.h	1
gl/./c-ctype.h	1
./element.h	1
element.c	1
coding.c	2

Fuzzer: asn1_decode_simple_der_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	1	12.5%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	7	87.5%
All colors	8	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	0	None	0	0	asn1_get_length_der	call site: 00004	/src/libtasn1/lib/decoding.c:118
0	0	None	0	0	_asn1_decode_simple_der	call site: 00002	/src/libtasn1/lib/decoding.c:2133
0	0	None	0	0	_asn1_decode_simple_der	call site: 00002	/src/libtasn1/lib/decoding.c:2141

Runtime coverage analysis

Covered functions

5

Functions that are reachable but not covered

1

Reachable functions

6

Percentage of reachable functions covered

83.33%

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
/src/libtasn1/fuzz/asn1_decode_simple_der_fuzzer.c	1
decoding.c	4

Fuzzer: asn1_get_length_ber_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	0	0.0%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	6	100.%
All colors	6	100

Runtime coverage analysis

Covered functions

5

Functions that are reachable but not covered

0

Reachable functions

5

Percentage of reachable functions covered

100.0%

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
/src/libtasn1/fuzz/asn1_get_length_ber_fuzzer.c	1
decoding.c	4

Fuzzer: asn1_get_length_der_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	0	0.0%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	2	100.%
All colors	2	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	0	None	0	0	asn1_get_length_der	call site: 00001	/src/libtasn1/lib/decoding.c:118

Runtime coverage analysis

Covered functions

2

Functions that are reachable but not covered

0

Reachable functions

2

Percentage of reachable functions covered

100.0%

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
/src/libtasn1/fuzz/asn1_get_length_der_fuzzer.c	1
decoding.c	1

Fuzzer: libtasn1_gnutls_der_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	284	65.8%
gold	[1:9]	11	2.55%
yellow	[10:29]	8	1.85%
greenyellow	[30:49]	2	0.46%
lawngreen	50+	126	29.2%
All colors	431	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
839	1837	16 : View List ['extract_tag_der_recursive', '_asn1_append_sequence_set', 'asn1_get_length_der', '_asn1_find_up', '_asn1_get_time_der', '_asn1_delete_not_used', 'asn1_get_tag_der', '_asn1_decode_simple_ber', 'type_field', 'asn1_get_object_id_der', 'strlen', 'free', '_asn1_set_value', '_asn1_set_value_lv', '_asn1_get_indefinite_length_string', 'delete_unneeded_choice_fields']	866	2020	asn1_der_decoding2	call site: 00207	/src/libtasn1/lib/decoding.c:1101
113	151	3 : View List ['asn1_get_length_der', 'strtoul', 'asn1_get_length_ber']	113	318	_asn1_extract_tag_der	call site: 00178	/src/libtasn1/lib/decoding.c:568
27	27	1 : View List ['_asn1_error_description_tag_error']	27	66	asn1_der_decoding2	call site: 00208	/src/libtasn1/lib/decoding.c:1108
12	12	1 : View List ['_asn1_delete_list_and_nodes']	12	12	asn1_array2tree	call site: 00124	/src/libtasn1/lib/structure.c:275
4	23	3 : View List ['_asn1_ltostr', 'strtoul', '_asn1_set_name']	4	43	_asn1_insert_tag_der	call site: 00360	/src/libtasn1/lib/coding.c:676
3	3	1 : View List ['safe_memset']	3	3	_asn1_remove_node	call site: 00016	/src/libtasn1/lib/parser_aux.c:512
2	22	4 : View List ['strtol', 'type_field.275', 'asn1_length_der', '_asn1_set_name']	2	22	_asn1_complete_explicit_tag	call site: 00421	/src/libtasn1/lib/coding.c:547
2	2	2 : View List ['strcmp', 'type_field.63']	4	20	asn1_write_value	call site: 00329	/src/libtasn1/lib/element.c:568
0	28	2 : View List ['_asn1_str_cpy', '_asn1_str_cat']	12	43	asn1_array2tree	call site: 00081	/src/libtasn1/lib/structure.c:263
0	2	1 : View List ['_asn1_hash_name']	0	2	_asn1_cpy_name	call site: 00134	/src/libtasn1/lib/parser_aux.c:442
0	0	None	866	2020	asn1_der_decoding2	call site: 00174	/src/libtasn1/lib/decoding.c:936
0	0	None	866	2020	asn1_der_decoding2	call site: 00174	/src/libtasn1/lib/decoding.c:959

Runtime coverage analysis

Covered functions

47

Functions that are reachable but not covered

42

Reachable functions

89

Percentage of reachable functions covered

52.81%

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
/src/libtasn1/fuzz/libtasn1_gnutls_der_fuzzer.c	1
structure.c	10
./int.h	3
parser_aux.c	20
gstr.c	2
./parser_aux.h	1
./gstr.h	1
gl/./c-ctype.h	1
./element.h	1
element.c	5
coding.c	14
decoding.c	16

Fuzzer: libtasn1_pkix_der_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	97	32.2%
gold	[1:9]	11	3.65%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	1	0.33%
lawngreen	50+	192	63.7%
All colors	301	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
27	27	1 : View List ['_asn1_error_description_tag_error']	27	66	asn1_der_decoding2	call site: 00208	/src/libtasn1/lib/decoding.c:1108
12	12	1 : View List ['_asn1_delete_list_and_nodes']	12	12	asn1_array2tree	call site: 00124	/src/libtasn1/lib/structure.c:275
3	3	1 : View List ['safe_memset']	3	3	_asn1_remove_node	call site: 00016	/src/libtasn1/lib/parser_aux.c:512
0	717	2 : View List ['asn1_der_decoding', 'asn1_find_node']	0	717	asn1_der_decoding_startEnd	call site: 00297	/src/libtasn1/lib/decoding.c:1709
0	155	1 : View List ['_asn1_extract_tag_der']	0	155	extract_tag_der_recursive	call site: 00178	/src/libtasn1/lib/decoding.c:749
0	28	2 : View List ['_asn1_str_cpy', '_asn1_str_cat']	12	43	asn1_array2tree	call site: 00081	/src/libtasn1/lib/structure.c:263
0	2	1 : View List ['_asn1_hash_name']	0	2	_asn1_cpy_name	call site: 00134	/src/libtasn1/lib/parser_aux.c:442
0	0	None	31	2020	asn1_der_decoding2	call site: 00174	/src/libtasn1/lib/decoding.c:936
0	0	None	31	2020	asn1_der_decoding2	call site: 00174	/src/libtasn1/lib/decoding.c:959
0	0	None	31	2020	asn1_der_decoding2	call site: 00267	/src/libtasn1/lib/decoding.c:1342
0	0	None	31	2020	asn1_der_decoding2	call site: 00288	/src/libtasn1/lib/decoding.c:1527
0	0	None	31	2020	asn1_der_decoding2	call site: 00288	/src/libtasn1/lib/decoding.c:1560

Runtime coverage analysis

Covered functions

54

Functions that are reachable but not covered

21

Reachable functions

75

Percentage of reachable functions covered

72.0%

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
/src/libtasn1/fuzz/libtasn1_pkix_der_fuzzer.c	1
structure.c	10
./int.h	3
parser_aux.c	20
gstr.c	2
./parser_aux.h	1
./gstr.h	1
gl/./c-ctype.h	1
./element.h	1
element.c	4
coding.c	2
decoding.c	17

Fuzzer: libtasn1_parser2tree_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	217	63.2%
gold	[1:9]	0	0.0%
yellow	[10:29]	3	0.87%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	123	35.8%
All colors	343	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
3	3	1 : View List ['safe_memset']	3	3	_asn1_remove_node	call site: 00298	/src/libtasn1/lib/parser_aux.c:512
2	2	1 : View List ['strcpy']	2	2	_asn1_check_identifier	call site: 00237	/src/libtasn1/lib/parser_aux.c:1043
0	0	None	28	1016	_asn1_yyparse	call site: 00203	/src/libtasn1/lib/ASN1.c:1534
0	0	None	28	1016	_asn1_yyparse	call site: 00203	/src/libtasn1/lib/ASN1.c:1542
0	0	None	28	1016	_asn1_yyparse	call site: 00203	/src/libtasn1/lib/ASN1.c:1619
0	0	None	28	1016	_asn1_yyparse	call site: 00204	/src/libtasn1/lib/ASN1.c:2602
0	0	None	28	1016	_asn1_yyparse	call site: 00212	/src/libtasn1/lib/ASN1.c:2631
0	0	None	4	343	_asn1_expand_object_id	call site: 00293	/src/libtasn1/lib/parser_aux.c:780
0	0	None	4	343	_asn1_expand_object_id	call site: 00318	/src/libtasn1/lib/parser_aux.c:844
0	0	None	2	126	_asn1_expand_object_id	call site: 00331	/src/libtasn1/lib/parser_aux.c:919
0	0	None	0	40	_asn1_change_integer_value	call site: 00279	/src/libtasn1/lib/parser_aux.c:702
0	0	None	0	39	_asn1_delete_structure	call site: 00296	/src/libtasn1/lib/structure.c:342

Runtime coverage analysis

Covered functions

45

Functions that are reachable but not covered

16

Reachable functions

61

Percentage of reachable functions covered

73.77%

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
/src/libtasn1/fuzz/libtasn1_parser2tree_fuzzer.c	2
ASN1.y	4
ASN1.c	4
gl/./c-ctype.h	1
parser_aux.c	19
./parser_aux.h	4
gstr.c	2
./int.h	1
./element.h	1
element.c	1
coding.c	2
structure.c	4
./gstr.h	1

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
asn1_expand_any_defined_by	/src/libtasn1/lib/decoding.c	2	['N/A', 'N/A']	7	0	596	107	39	66	0	879	118
asn1_print_structure	/src/libtasn1/lib/structure.c	4	['N/A', 'N/A', 'N/A', 'int']	3	0	1601	320	74	14	0	184	76

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

Functions statically reachable by fuzzers

97 / 126

Cyclomatic complexity statically reachable by fuzzers

1547 / 2352

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

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.

/src/libtasn1/fuzz/asn1_get_object_id_der_fuzzer.c

Dictionary

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

/src/libtasn1/fuzz/asn1_decode_simple_ber_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=['asn1_get_length_ber', '_asn1_decode_simple_ber']

/src/libtasn1/fuzz/libtasn1_array2tree_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=['_asn1_delete_structure', 'asn1_array2tree', '_asn1_check_identifier']

/src/libtasn1/fuzz/asn1_decode_simple_der_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=['_asn1_decode_simple_der']

/src/libtasn1/fuzz/asn1_get_length_ber_fuzzer.c

Dictionary

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

/src/libtasn1/fuzz/asn1_get_length_der_fuzzer.c

Dictionary

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

/src/libtasn1/fuzz/libtasn1_gnutls_der_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=['asn1_der_decoding2', 'asn1_write_value', 'extract_tag_der_recursive', 'asn1_der_coding', '_asn1_expand_object_id']

/src/libtasn1/fuzz/libtasn1_pkix_der_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=['_asn1_expand_object_id', '_asn1_type_choice_config', 'asn1_der_decoding2', '_asn1_check_identifier', '_asn1_add_single_node', '_asn1_change_integer_value', 'asn1_find_node']

/src/libtasn1/fuzz/libtasn1_parser2tree_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=['_asn1_set_name', '_asn1_yyparse', '_asn1_delete_list_and_nodes', '_asn1_delete_structure', '_asn1_add_static_node', '_asn1_expand_object_id', 'LLVMFuzzerTestOneInput', 'fopen']

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
asn1_der_coding	326	115	35.27%	['libtasn1_gnutls_der_fuzzer']
_asn1_insert_tag_der	88	29	32.95%	['libtasn1_gnutls_der_fuzzer']
_asn1_complete_explicit_tag	48	11	22.91%	['libtasn1_gnutls_der_fuzzer']
asn1_write_value	322	25	7.763%	['libtasn1_gnutls_der_fuzzer']
_asn1_type_choice_config	75	36	48.0%	['libtasn1_pkix_der_fuzzer', 'libtasn1_gnutls_der_fuzzer']
asn1_der_decoding_startEnd	31	14	45.16%	['libtasn1_pkix_der_fuzzer']
_asn1_get_time_der	53	23	43.39%	['libtasn1_pkix_der_fuzzer', 'libtasn1_gnutls_der_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/libtasn1/lib/./int.h	['asn1_decode_simple_ber_fuzzer', 'libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	[]
/src/libtasn1/lib/ASN1.c	['libtasn1_parser2tree_fuzzer']	['libtasn1_parser2tree_fuzzer']
/src/libtasn1/lib/./parser_aux.h	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	[]
/src/libtasn1/fuzz/asn1_get_object_id_der_fuzzer.c	['asn1_get_object_id_der_fuzzer']	['asn1_get_object_id_der_fuzzer']
/src/libtasn1/fuzz/asn1_get_length_der_fuzzer.c	['asn1_get_length_der_fuzzer']	['asn1_get_length_der_fuzzer']
/src/libtasn1/fuzz/asn1_decode_simple_ber_fuzzer.c	['asn1_decode_simple_ber_fuzzer']	['asn1_decode_simple_ber_fuzzer']
/src/libtasn1/lib/coding.c	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']
/src/libtasn1/lib/./element.h	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	[]
/src/libtasn1/lib/gl/./c-ctype.h	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	[]
/src/libtasn1/fuzz/libtasn1_array2tree_fuzzer.c	['libtasn1_array2tree_fuzzer']	['libtasn1_array2tree_fuzzer']
/src/libtasn1/lib/element.c	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']
/src/libtasn1/lib/decoding.c	['asn1_get_object_id_der_fuzzer', 'asn1_decode_simple_ber_fuzzer', 'asn1_decode_simple_der_fuzzer', 'asn1_get_length_ber_fuzzer', 'asn1_get_length_der_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer']	['asn1_get_object_id_der_fuzzer', 'asn1_decode_simple_ber_fuzzer', 'asn1_decode_simple_der_fuzzer', 'asn1_get_length_ber_fuzzer', 'asn1_get_length_der_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer']
/src/libtasn1/fuzz/libtasn1_pkix_der_fuzzer.c	['libtasn1_pkix_der_fuzzer']	['libtasn1_pkix_der_fuzzer']
/src/libtasn1/lib/ASN1.y	['libtasn1_parser2tree_fuzzer']	['libtasn1_parser2tree_fuzzer']
/src/libtasn1/lib/gstr.c	['asn1_get_object_id_der_fuzzer', 'libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	['asn1_get_object_id_der_fuzzer', 'libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']
/src/libtasn1/fuzz/asn1_decode_simple_der_fuzzer.c	['asn1_decode_simple_der_fuzzer']	['asn1_decode_simple_der_fuzzer']
/src/libtasn1/fuzz/libtasn1_gnutls_der_fuzzer.c	['libtasn1_gnutls_der_fuzzer']	['libtasn1_gnutls_der_fuzzer']
/src/libtasn1/fuzz/libtasn1_parser2tree_fuzzer.c	['libtasn1_parser2tree_fuzzer']	['libtasn1_parser2tree_fuzzer']
/src/libtasn1/lib/parser_aux.c	['asn1_get_object_id_der_fuzzer', 'libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	['asn1_get_object_id_der_fuzzer', 'libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']
/src/libtasn1/lib/structure.c	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']
/src/libtasn1/lib/./gstr.h	['libtasn1_array2tree_fuzzer', 'libtasn1_gnutls_der_fuzzer', 'libtasn1_pkix_der_fuzzer', 'libtasn1_parser2tree_fuzzer']	[]
/src/libtasn1/fuzz/asn1_get_length_ber_fuzzer.c	['asn1_get_length_ber_fuzzer']	['asn1_get_length_ber_fuzzer']

Directories in report

Directory
/src/libtasn1/fuzz/
/src/libtasn1/lib/
/src/libtasn1/lib/./
/src/libtasn1/lib/gl/./