High level conclusions

Fuzzers reach 43.18% of cyclomatic complexity.

Fuzzers reach 41.90% of all functions.

Fuzzer pe_fuzzer is blocked:

The runtime code coverage of pe_fuzzer covers 18.49% of its statically reachable code. This means there is some place that blocks the fuzzer to continue exploring more code at run time.

Fuzzer dex_fuzzer is blocked:

The runtime code coverage of dex_fuzzer covers 17.12% 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

334 / 797

Cyclomatic complexity statically reachable by fuzzers

3301 / 7644

Runtime code coverage of functions

373 / 797

Warning: The number of runtime covered functions are larger than the number of reachable functions. This means that Fuzz Introspector found there are more functions covered at runtime than what is considered reachable based on the static analysis. This is a limitation in the analysis as anything covered at runtime is by definition reachable by the fuzzers.
This is likely due to a limitation in the static analysis. In this case, the count of functions covered at runtime is the true value, which means this is what should be considered "achieved" by the fuzzer.

Use the project functions table below to query all functions that were not covered at runtime.

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: dex_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	527	91.0%
gold	[1:9]	26	4.49%
yellow	[10:29]	5	0.86%
greenyellow	[30:49]	2	0.34%
lawngreen	50+	19	3.28%
All colors	579	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
8	8	1 : View List ['strlcpy']	8	142	yr_parser_reduce_import	call site: 00000	/src/yara/libyara/parser.c:1357
0	47	1 : View List ['yr_compiler_destroy']	0	47	yr_compiler_create	call site: 00000	/src/yara/libyara/compiler.c:276
0	15	1 : View List ['yr_object_destroy']	0	21	yr_object_destroy	call site: 00025	/src/yara/libyara/object.c:355
0	6	1 : View List ['yr_free']	0	6	yr_arena_release	call site: 00224	/src/yara/libyara/arena.c:275
0	4	1 : View List ['yr_free']	0	4	yr_ac_automaton_create	call site: 00000	/src/yara/libyara/ahocorasick.c:739
0	4	1 : View List ['yr_free']	0	4	yr_hash_table_add_raw_key	call site: 00126	/src/yara/libyara/hash.c:318
0	2	1 : View List ['yr_free']	0	2	yr_rules_from_arena	call site: 00000	/src/yara/libyara/rules.c:342
0	0	None	33161	34737	yara_yyparse	call site: 00000	/src/yara/libyara/grammar.c:1964
0	0	None	33161	34737	yara_yyparse	call site: 00000	/src/yara/libyara/grammar.c:2061
0	0	None	33161	34737	yara_yyparse	call site: 00000	/src/yara/libyara/grammar.c:2080
0	0	None	33161	34737	yara_yyparse	call site: 00000	/src/yara/libyara/grammar.c:2083
0	0	None	33161	34737	yara_yyparse	call site: 00000	/src/yara/libyara/grammar.c:2093

Runtime coverage analysis

Covered functions

93

Functions that are reachable but not covered

121

Reachable functions

146

Percentage of reachable functions covered

17.12%

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
tests/oss-fuzz/dex_fuzzer.cc	2
libyara/rules.c	1
libyara/scanner.c	10
libyara/mem.c	5
libyara/hash.c	12
libyara/object.c	15
libyara/sizedstr.c	10
libyara/libyara.c	2
libyara/notebook.c	3
libyara/stopwatch.c	2
libyara/threading.c	2
libyara/exefiles.c	7
libyara/scan.c	14
libyara/strutils.c	1
libyara/exec.c	14
libyara/arena.c	6
./libyara/include/yara/unaligned.h	5
libyara/modules.c	3
libyara/re.c	11

Fuzzer: pe_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	522	90.1%
gold	[1:9]	25	4.31%
yellow	[10:29]	8	1.38%
greenyellow	[30:49]	3	0.51%
lawngreen	50+	21	3.62%
All colors	579	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
19	19	1 : View List ['yara_yywarning']	35	80	yr_parser_reduce_rule_declaration_phase_2	call site: 00000	/src/yara/libyara/parser.c:1108
8	8	1 : View List ['strlcpy']	8	238	yr_parser_reduce_rule_declaration_phase_1	call site: 00000	/src/yara/libyara/parser.c:1014
8	8	1 : View List ['strlcpy']	8	142	yr_parser_reduce_import	call site: 00000	/src/yara/libyara/parser.c:1357
4	4	2 : View List ['strcmp', 'memcmp']	4	10	_yr_hash_table_lookup	call site: 00328	/src/yara/libyara/hash.c:149
0	47	1 : View List ['yr_compiler_destroy']	0	47	yr_compiler_create	call site: 00000	/src/yara/libyara/compiler.c:276
0	29	1 : View List ['yr_parser_emit_with_arg']	0	75	yr_parser_reduce_operation	call site: 00000	/src/yara/libyara/parser.c:1456
0	15	1 : View List ['yr_object_destroy']	0	23	yr_object_destroy	call site: 00025	/src/yara/libyara/object.c:371
0	15	1 : View List ['yr_object_destroy']	0	21	yr_object_destroy	call site: 00025	/src/yara/libyara/object.c:355
0	6	1 : View List ['yr_free']	0	6	yr_arena_release	call site: 00224	/src/yara/libyara/arena.c:275
0	6	1 : View List ['yr_free']	0	6	_yr_hash_table_lookup	call site: 00328	/src/yara/libyara/hash.c:153
0	4	1 : View List ['yr_free']	0	4	yr_ac_automaton_create	call site: 00000	/src/yara/libyara/ahocorasick.c:739
0	4	1 : View List ['yr_free']	0	4	yr_hash_table_add_raw_key	call site: 00126	/src/yara/libyara/hash.c:318

Runtime coverage analysis

Covered functions

109

Functions that are reachable but not covered

119

Reachable functions

146

Percentage of reachable functions covered

18.49%

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
tests/oss-fuzz/pe_fuzzer.cc	2
libyara/rules.c	1
libyara/scanner.c	10
libyara/mem.c	5
libyara/hash.c	12
libyara/object.c	15
libyara/sizedstr.c	10
libyara/libyara.c	2
libyara/notebook.c	3
libyara/stopwatch.c	2
libyara/threading.c	2
libyara/exefiles.c	7
libyara/scan.c	14
libyara/strutils.c	1
libyara/exec.c	14
libyara/arena.c	6
./libyara/include/yara/unaligned.h	5
libyara/modules.c	3
libyara/re.c	11

Fuzzer: dotnet_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	382	65.9%
gold	[1:9]	6	1.03%
yellow	[10:29]	3	0.51%
greenyellow	[30:49]	1	0.17%
lawngreen	50+	187	32.2%
All colors	579	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
192	192	1 : View List ['yr_scan_verify_match']	192	192	_yr_scanner_scan_mem_block	call site: 00172	/src/yara/libyara/scanner.c:154
19	19	1 : View List ['yara_yywarning']	35	80	yr_parser_reduce_rule_declaration_phase_2	call site: 00000	/src/yara/libyara/parser.c:1108
8	8	1 : View List ['strlcpy']	8	238	yr_parser_reduce_rule_declaration_phase_1	call site: 00000	/src/yara/libyara/parser.c:1014
8	8	1 : View List ['strlcpy']	8	142	yr_parser_reduce_import	call site: 00000	/src/yara/libyara/parser.c:1357
8	8	1 : View List ['strlcpy']	8	8	yr_parser_reduce_operation	call site: 00000	/src/yara/libyara/parser.c:1481
5	5	1 : View List ['ss_dup']	5	5	yr_object_copy	call site: 00074	/src/yara/libyara/object.c:562
4	4	2 : View List ['strcmp', 'memcmp']	4	10	_yr_hash_table_lookup	call site: 00328	/src/yara/libyara/hash.c:149
2	6	3 : View List ['strlen', 'yr_free', 'yr_malloc']	2	6	sstr_new	call site: 00000	/src/yara/libyara/simple_str.c:72
0	47	1 : View List ['yr_compiler_destroy']	0	47	yr_compiler_create	call site: 00000	/src/yara/libyara/compiler.c:276
0	5	1 : View List ['sstr_free']	0	5	sstr_newf	call site: 00000	/src/yara/libyara/simple_str.c:100
0	4	1 : View List ['yr_free']	0	4	yr_ac_automaton_create	call site: 00000	/src/yara/libyara/ahocorasick.c:739
0	4	1 : View List ['yr_free']	0	4	yr_hash_table_add_raw_key	call site: 00126	/src/yara/libyara/hash.c:318

Runtime coverage analysis

Covered functions

201

Functions that are reachable but not covered

76

Reachable functions

146

Percentage of reachable functions covered

47.95%

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
tests/oss-fuzz/dotnet_fuzzer.cc	2
libyara/rules.c	1
libyara/scanner.c	10
libyara/mem.c	5
libyara/hash.c	12
libyara/object.c	15
libyara/sizedstr.c	10
libyara/libyara.c	2
libyara/notebook.c	3
libyara/stopwatch.c	2
libyara/threading.c	2
libyara/exefiles.c	7
libyara/scan.c	14
libyara/strutils.c	1
libyara/exec.c	14
libyara/arena.c	6
./libyara/include/yara/unaligned.h	5
libyara/modules.c	3
libyara/re.c	11

Fuzzer: rules_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	900	53.0%
gold	[1:9]	9	0.53%
yellow	[10:29]	11	0.64%
greenyellow	[30:49]	13	0.76%
lawngreen	50+	764	45.0%
All colors	1697	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	521	7 : View List ['yr_arena_get_ptr', '_yr_parser_write_string', 'yr_re_ast_has_unbounded_quantifier_for_dot', 'yr_arena_ref_to_ptr', 'memcmp', 'yr_re_ast_split_at_chaining_point', 'yara_yywarning']	2	556	yr_parser_reduce_string_declaration	call site: 00830	/src/yara/libyara/parser.c:794
2	2	1 : View List ['strlen']	2	2	strlcat	call site: 01182	/src/yara/libyara/strutils.c:138
0	47	1 : View List ['yr_compiler_destroy']	0	47	yr_compiler_create	call site: 00013	/src/yara/libyara/compiler.c:276
0	15	1 : View List ['yr_object_destroy']	0	23	yr_object_destroy	call site: 00040	/src/yara/libyara/object.c:371
0	15	1 : View List ['yr_object_destroy']	0	21	yr_object_destroy	call site: 00040	/src/yara/libyara/object.c:355
0	6	1 : View List ['yr_free']	0	6	_yr_hash_table_lookup	call site: 00086	/src/yara/libyara/hash.c:153
0	4	1 : View List ['yr_free']	0	4	yr_ac_automaton_create	call site: 00015	/src/yara/libyara/ahocorasick.c:739
0	4	1 : View List ['yr_free']	0	4	yr_hash_table_add_raw_key	call site: 00097	/src/yara/libyara/hash.c:318
0	2	1 : View List ['yr_free']	0	2	yr_rules_from_arena	call site: 01681	/src/yara/libyara/rules.c:342
0	2	1 : View List ['yr_free']	0	2	yr_stack_create	call site: 00996	/src/yara/libyara/stack.c:50
0	0	None	20	34737	yara_yyparse	call site: 01374	/src/yara/libyara/grammar.c:2004
0	0	None	20	34737	yara_yyparse	call site: 01395	/src/yara/libyara/grammar.c:2061

Runtime coverage analysis

Covered functions

250

Functions that are reachable but not covered

52

Reachable functions

273

Percentage of reachable functions covered

80.95%

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
tests/oss-fuzz/rules_fuzzer.cc	1
libyara/compiler.c	14
libyara/mem.c	5
libyara/hash.c	15
libyara/arena.c	14
libyara/ahocorasick.c	15
libyara/object.c	4
libyara/lexer.l	5
libyara/lexer.c	27
libyara/strutils.c	3
libyara/libyara.c	2
libyara/grammar.c	6
libyara/parser.c	23
libyara/modules.c	1
libyara/re.c	21
libyara/hex_lexer.l	3
libyara/threading.c	2
libyara/hex_lexer.c	24
hex_grammar.c	2
libyara/re_lexer.l	6
libyara/re_lexer.c	25
re_grammar.c	2
libyara/base64.c	7
libyara/sizedstr.c	3
libyara/atoms.c	17
libyara/stack.c	4
libyara/bitmask.c	1
libyara/rules.c	2

Fuzzer: elf_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	404	69.7%
gold	[1:9]	8	1.38%
yellow	[10:29]	2	0.34%
greenyellow	[30:49]	1	0.17%
lawngreen	50+	164	28.3%
All colors	579	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
192	192	1 : View List ['yr_scan_verify_match']	192	192	_yr_scanner_scan_mem_block	call site: 00172	/src/yara/libyara/scanner.c:154
8	8	1 : View List ['strlcpy']	8	142	yr_parser_reduce_import	call site: 00000	/src/yara/libyara/parser.c:1357
5	5	1 : View List ['ss_dup']	5	5	yr_object_copy	call site: 00074	/src/yara/libyara/object.c:562
4	4	2 : View List ['strcmp', 'memcmp']	4	10	_yr_hash_table_lookup	call site: 00328	/src/yara/libyara/hash.c:149
0	47	1 : View List ['yr_compiler_destroy']	0	47	yr_compiler_create	call site: 00000	/src/yara/libyara/compiler.c:276
0	4	1 : View List ['yr_free']	0	4	yr_ac_automaton_create	call site: 00000	/src/yara/libyara/ahocorasick.c:739
0	4	1 : View List ['yr_free']	0	4	yr_hash_table_add_raw_key	call site: 00126	/src/yara/libyara/hash.c:318
0	2	1 : View List ['yr_free']	0	4	yr_object_set_string	call site: 00115	/src/yara/libyara/object.c:1036
0	2	1 : View List ['yr_free']	0	2	yr_notebook_create	call site: 00146	/src/yara/libyara/notebook.c:95
0	2	1 : View List ['yr_free']	0	2	yr_rules_from_arena	call site: 00000	/src/yara/libyara/rules.c:342
0	0	None	33155	34737	yara_yyparse	call site: 00000	/src/yara/libyara/grammar.c:1964
0	0	None	33155	34737	yara_yyparse	call site: 00000	/src/yara/libyara/grammar.c:2061

Runtime coverage analysis

Covered functions

149

Functions that are reachable but not covered

81

Reachable functions

146

Percentage of reachable functions covered

44.52%

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
tests/oss-fuzz/elf_fuzzer.cc	2
libyara/rules.c	1
libyara/scanner.c	10
libyara/mem.c	5
libyara/hash.c	12
libyara/object.c	15
libyara/sizedstr.c	10
libyara/libyara.c	2
libyara/notebook.c	3
libyara/stopwatch.c	2
libyara/threading.c	2
libyara/exefiles.c	7
libyara/scan.c	14
libyara/strutils.c	1
libyara/exec.c	14
libyara/arena.c	6
./libyara/include/yara/unaligned.h	5
libyara/modules.c	3
libyara/re.c	11

Fuzzer: macho_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	378	65.2%
gold	[1:9]	6	1.03%
yellow	[10:29]	3	0.51%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	192	33.1%
All colors	579	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
192	192	1 : View List ['yr_scan_verify_match']	192	192	_yr_scanner_scan_mem_block	call site: 00172	/src/yara/libyara/scanner.c:154
131	131	1 : View List ['macho_offset_to_rva']	131	377	macho_handle_main	call site: 00000	/src/yara/libyara/modules/macho/macho.c:351
19	19	1 : View List ['yara_yywarning']	35	80	yr_parser_reduce_rule_declaration_phase_2	call site: 00000	/src/yara/libyara/parser.c:1108
8	8	1 : View List ['strlcpy']	8	238	yr_parser_reduce_rule_declaration_phase_1	call site: 00000	/src/yara/libyara/parser.c:1014
8	8	1 : View List ['strlcpy']	8	142	yr_parser_reduce_import	call site: 00000	/src/yara/libyara/parser.c:1357
8	8	1 : View List ['strlcpy']	8	8	yr_parser_reduce_operation	call site: 00000	/src/yara/libyara/parser.c:1481
5	5	1 : View List ['ss_dup']	5	5	yr_object_copy	call site: 00074	/src/yara/libyara/object.c:562
4	4	2 : View List ['strcmp', 'memcmp']	4	10	_yr_hash_table_lookup	call site: 00328	/src/yara/libyara/hash.c:149
0	47	1 : View List ['yr_compiler_destroy']	0	47	yr_compiler_create	call site: 00000	/src/yara/libyara/compiler.c:276
0	4	1 : View List ['yr_free']	0	4	yr_ac_automaton_create	call site: 00000	/src/yara/libyara/ahocorasick.c:739
0	4	1 : View List ['yr_free']	0	4	yr_hash_table_add_raw_key	call site: 00126	/src/yara/libyara/hash.c:318
0	2	1 : View List ['yr_free']	0	4	yr_object_set_string	call site: 00115	/src/yara/libyara/object.c:1036

Runtime coverage analysis

Covered functions

178

Functions that are reachable but not covered

77

Reachable functions

146

Percentage of reachable functions covered

47.26%

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
tests/oss-fuzz/macho_fuzzer.cc	2
libyara/rules.c	1
libyara/scanner.c	10
libyara/mem.c	5
libyara/hash.c	12
libyara/object.c	15
libyara/sizedstr.c	10
libyara/libyara.c	2
libyara/notebook.c	3
libyara/stopwatch.c	2
libyara/threading.c	2
libyara/exefiles.c	7
libyara/scan.c	14
libyara/strutils.c	1
libyara/exec.c	14
libyara/arena.c	6
./libyara/include/yara/unaligned.h	5
libyara/modules.c	3
libyara/re.c	11

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
dotnet__load	/src/yara/libyara/modules/dotnet/dotnet.c	4	['N/A', 'N/A', 'N/A', 'size_t']	13	0	157	21	8	85	0	843	686
pe__declarations	/src/yara/libyara/modules/pe/pe.c	1	['N/A']	8	0	6899	772	330	86	0	892	587
pe__load	/src/yara/libyara/modules/pe/pe.c	4	['N/A', 'N/A', 'N/A', 'size_t']	10	0	551	23	9	67	0	626	440
elf__load	/src/yara/libyara/modules/elf/elf.c	4	['N/A', 'N/A', 'N/A', 'size_t']	8	0	537	56	21	42	0	447	302
elf__declarations	/src/yara/libyara/modules/elf/elf.c	1	['N/A']	8	0	2833	319	142	60	0	472	301
macho__declarations	/src/yara/libyara/modules/macho/macho.c	1	['N/A']	8	0	4641	520	239	34	0	408	262
math__declarations	/src/yara/libyara/modules/math/math.c	1	['N/A']	8	0	509	52	26	62	0	376	212
dex__declarations	/src/yara/libyara/modules/dex/dex.c	1	['N/A']	8	0	3528	401	155	52	0	496	195
dex__load	/src/yara/libyara/modules/dex/dex.c	4	['N/A', 'N/A', 'N/A', 'size_t']	10	0	224	15	6	41	0	282	129
macho__load	/src/yara/libyara/modules/macho/macho.c	4	['N/A', 'N/A', 'N/A', 'size_t']	9	0	123	17	7	55	0	263	114

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

Functions statically reachable by fuzzers

558 / 797

Cyclomatic complexity statically reachable by fuzzers

6507 / 7644

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.

tests/oss-fuzz/dex_fuzzer.cc

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=['yr_modules_do_declarations', 'yr_arena_create', 'yr_hash_table_add_raw_key', '_yr_arena_allocate_memory', 'yr_object_create', '_yr_hash_table_lookup', 'yr_realloc', 'yr_arena_get_ptr', 'yr_hash_table_create', 'yr_object_destroy']

tests/oss-fuzz/pe_fuzzer.cc

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=['yr_modules_do_declarations', 'yr_arena_create', '_yr_arena_allocate_memory', 'yr_get_configuration_uint32', 'yr_object_create', 'yr_realloc', '_yr_hash_table_lookup', 'yr_arena_get_ptr', 'yr_hash_table_create', 'yr_object_destroy']

tests/oss-fuzz/dotnet_fuzzer.cc

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=['yr_modules_load', '_yr_arena_allocate_memory', 'yr_execute_code', 'yr_scanner_scan_mem_blocks', 'yr_realloc', 'yr_object_destroy', 'yr_object_set_integer']

tests/oss-fuzz/rules_fuzzer.cc

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=['re_yyrestart', 'yara_yypop_buffer_state', 'yr_parser_reduce_string_identifier', 'yr_parser_emit_push_const', 'yara_yy_scan_bytes', 'yara_yylex', 'xtoi', 'yr_re_node_create', 'yr_parser_check_types', 'yr_parser_reduce_string_declaration']

tests/oss-fuzz/elf_fuzzer.cc

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=['yr_modules_load', 'yr_execute_code', '_yr_arena_allocate_memory', 'yr_scanner_scan_mem_blocks', '_yr_hash_table_lookup', 'yr_realloc', 'yr_object_copy', 'yr_object_set_integer', 'yr_object_destroy']

tests/oss-fuzz/macho_fuzzer.cc

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=['yr_modules_load', '_yr_arena_allocate_memory', 'yr_execute_code', 'yr_scanner_scan_mem_blocks', 'yr_realloc', 'yr_object_set_integer', 'yr_object_destroy']

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
yr_execute_code	1530	211	13.79%	['pe_fuzzer', 'elf_fuzzer', 'dex_fuzzer', 'macho_fuzzer', 'dotnet_fuzzer']
_yr_scanner_scan_mem_block	117	50	42.73%	['pe_fuzzer', 'elf_fuzzer', 'dex_fuzzer', 'macho_fuzzer', 'dotnet_fuzzer']
_yr_compiler_default_include_callback	41	17	41.46%	['rules_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/yara/libyara/modules/console/console.c	[]	[]
/src/yara/libyara/base64.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/libyara.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/object.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/modules/dotnet/dotnet.c	[]	[]
/src/yara/./libyara/include/yara/unaligned.h	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	[]
/src/yara/libyara/hash.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/sizedstr.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dotnet_fuzzer', 'rules_fuzzer', 'macho_fuzzer']
/src/yara/libyara/proc/linux.c	[]	[]
/src/yara/libyara/stack.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/tests/oss-fuzz/elf_fuzzer.cc	['elf_fuzzer']	['elf_fuzzer']
/src/yara/libyara/tlshc/tlsh.c	[]	[]
/src/yara/libyara/exception.h	[]	[]
/src/yara/libyara/tlshc/tlsh_util.c	[]	[]
/src/yara/libyara/tlshc/tlsh_impl.c	[]	[]
/src/yara/libyara/strutils.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['rules_fuzzer']
/src/yara/libyara/atoms.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/mem.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/ahocorasick.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/modules/time/time.c	[]	[]
/src/yara/libyara/stopwatch.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/grammar.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/proc.c	[]	[]
/src/yara/libyara/threading.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/lexer.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/bitmask.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/exefiles.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/tests/oss-fuzz/pe_fuzzer.cc	['pe_fuzzer']	['pe_fuzzer']
/src/yara/libyara/modules/macho/macho.c	[]	[]
/src/yara/libyara/arena.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/parser.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/hex_lexer.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/tests/oss-fuzz/macho_fuzzer.cc	['macho_fuzzer']	['macho_fuzzer']
/src/yara/libyara/filemap.c	[]	[]
/src/yara/libyara/notebook.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/modules/elf/elf.c	[]	[]
/src/yara/libyara/scan.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	[]
/src/yara/hex_grammar.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/modules/dex/dex.c	[]	[]
/src/yara/tests/oss-fuzz/dex_fuzzer.cc	['dex_fuzzer']	['dex_fuzzer']
/src/yara/libyara/re_lexer.l	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/rules.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/simple_str.c	[]	[]
/src/yara/libyara/re_lexer.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/modules/pe/pe.c	[]	[]
/src/yara/libyara/modules/string/string.c	[]	[]
/src/yara/libyara/modules.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/modules/math/math.c	[]	[]
/src/yara/libyara/compiler.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/lexer.l	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/re.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'rules_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['rules_fuzzer']
/src/yara/libyara/hex_lexer.l	['rules_fuzzer']	['rules_fuzzer']
/src/yara/tests/oss-fuzz/dotnet_fuzzer.cc	['dotnet_fuzzer']	['dotnet_fuzzer']
/src/yara/re_grammar.c	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/stream.c	[]	[]
/src/yara/tests/oss-fuzz/rules_fuzzer.cc	['rules_fuzzer']	['rules_fuzzer']
/src/yara/libyara/modules/tests/tests.c	[]	[]
/src/yara/libyara/exec.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/scanner.c	['dex_fuzzer', 'pe_fuzzer', 'dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']	['dotnet_fuzzer', 'elf_fuzzer', 'macho_fuzzer']
/src/yara/libyara/modules/pe/pe_utils.c	[]	[]

Directories in report

Directory
/src/yara/libyara/modules/elf/
/src/yara/libyara/modules/dex/
/src/yara/libyara/proc/
/src/yara/libyara/tlshc/
/src/yara/libyara/modules/math/
/src/yara/libyara/modules/console/
/src/yara/libyara/modules/dotnet/
/src/yara/libyara/
/src/yara/
/src/yara/libyara/modules/pe/
/src/yara/libyara/modules/string/
/src/yara/libyara/modules/tests/
/src/yara/tests/oss-fuzz/
/src/yara/libyara/modules/macho/
/src/yara/libyara/modules/time/
/src/yara/./libyara/include/yara/