High level conclusions

Fuzzers reach 88.11% of cyclomatic complexity.

Fuzzers reach 83.84% of all functions.

Fuzzer augeas_api_fuzzer is blocked:

The runtime code coverage of augeas_api_fuzzer covers 21.76% of its statically reachable code. This means there is some place that blocks the fuzzer to continue exploring more code at run time.

Fuzzer augeas_escape_name_fuzzer is blocked:

The runtime code coverage of augeas_escape_name_fuzzer covers 17.56% 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

815 / 972

Cyclomatic complexity statically reachable by fuzzers

6227 / 7067

Runtime code coverage of functions

477 / 972

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: augeas_escape_name_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	3618	87.0%
gold	[1:9]	0	0.0%
yellow	[10:29]	9	0.21%
greenyellow	[30:49]	10	0.24%
lawngreen	50+	521	12.5%
All colors	4158	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
782	1478	make_closure	call site: 01478	compile_exp
608	2549	builtin_init	call site: 02549	lns_get
374	1050	check_exp	call site: 01050	check_decl
280	3182	builtin_init	call site: 03182	lns_put
272	353	pop_value	call site: 00353	eval_concat_regexp
198	3553	builtin_init	call site: 03553	lns_check_rec
197	3882	tree_mark_files	call site: 03882	transform_load
127	791	free_value	call site: 00791	free_transform
112	2262	bind	call site: 02262	check_exp
85	2462	builtin_init	call site: 02462	lns_make_square
39	2398	builtin_init	call site: 02398	lns_make_prim
38	981	check_exp	call site: 00981	check_binop

Runtime coverage analysis

Covered functions

149

Functions that are reachable but not covered

704

Reachable functions

854

Percentage of reachable functions covered

17.56%

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
augeas_escape_name_fuzzer.cc	2
src/augeas.c	53
src/memory.c	2
src/ref.c	1
src/info.c	10
src/errcode.c	4
src/./internal.h	2
src/pathx.c	105
src/regexp.c	24
src/internal.c	22
src/fa.c	137
src/syntax.c	79
src/builtin.c	40
src/lens.c	68
src/jmt.c	77
src/transform.c	31
src/parser.y	20
src/lexer.l	5
src/lexer.c	25
src/parser.c	11
src/hash.c	13
src/get.c	56
src/ast.c	6
src/put.c	35

Fuzzer: augeas_api_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	3506	83.3%
gold	[1:9]	42	0.99%
yellow	[10:29]	29	0.68%
greenyellow	[30:49]	158	3.75%
lawngreen	50+	471	11.1%
All colors	4206	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
743	1477	make_closure	call site: 01477	compile_exp
601	2548	builtin_init	call site: 02548	lns_get
280	3181	builtin_init	call site: 03181	lns_put
259	1164	unescape	call site: 01164	check_decl
245	366	push_boolean_value	call site: 00366	eval_concat_regexp
198	3552	builtin_init	call site: 03552	lns_check_rec
112	2261	bind	call site: 02261	check_exp
96	3952	tree_fpath_int	call site: 03952	lens_from_name
85	2461	builtin_init	call site: 02461	lns_make_square
78	1079	lookup_internal	call site: 01079	load_module
74	843	escape	call site: 00843	free_transform
43	790	free_value	call site: 00790	free_lens

Runtime coverage analysis

Covered functions

193

Functions that are reachable but not covered

672

Reachable functions

859

Percentage of reachable functions covered

21.77%

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
augeas_api_fuzzer.cc	1
src/augeas.c	56
src/memory.c	2
src/ref.c	1
src/info.c	10
src/errcode.c	4
src/./internal.h	2
src/pathx.c	105
src/regexp.c	24
src/internal.c	22
src/fa.c	137
src/syntax.c	79
src/builtin.c	40
src/lens.c	68
src/jmt.c	77
src/transform.c	32
src/parser.y	20
src/lexer.l	5
src/lexer.c	25
src/parser.c	11
src/hash.c	13
src/get.c	56
src/ast.c	6
src/put.c	35

Fuzzer: augeas_lens_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	2664	64.2%
gold	[1:9]	40	0.96%
yellow	[10:29]	19	0.45%
greenyellow	[30:49]	4	0.09%
lawngreen	50+	1417	34.1%
All colors	4144	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
631	2553	builtin_init	call site: 02553	lns_get
296	3831	free_module	call site: 03831	aug_load
280	3186	builtin_init	call site: 03186	lns_put
192	3563	lns_check_rec	call site: 03563	typecheck
85	2466	builtin_init	call site: 02466	lns_make_square
60	1294	make_app_ident	call site: 01294	make_put_test
49	1169	unescape	call site: 01169	regexp_literal
48	357	pop_value	call site: 00357	eval_concat_regexp
41	617	make_regexp	call site: 00617	eval_else
39	2313	compile_decl	call site: 02313	compile_test
38	1892	regexp_escape	call site: 01892	lns_format_atype
34	804	debugging	call site: 00804	dump_lens_tree

Runtime coverage analysis

Covered functions

410

Functions that are reachable but not covered

446

Reachable functions

854

Percentage of reachable functions covered

47.78%

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
augeas_lens_fuzzer.cc	1
src/augeas.c	52
src/memory.c	2
src/ref.c	1
src/info.c	10
src/errcode.c	4
src/./internal.h	2
src/pathx.c	105
src/regexp.c	24
src/internal.c	22
src/fa.c	137
src/syntax.c	79
src/builtin.c	40
src/lens.c	68
src/jmt.c	77
src/transform.c	31
src/parser.y	20
src/lexer.l	5
src/lexer.c	25
src/parser.c	11
src/hash.c	13
src/get.c	56
src/ast.c	6
src/put.c	35

Fuzzer: augeas_fa_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	229	35.1%
gold	[1:9]	4	0.61%
yellow	[10:29]	1	0.15%
greenyellow	[30:49]	5	0.76%
lawngreen	50+	413	63.3%
All colors	652	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
153	498	fa_example	call site: 00498	fa_minimize
10	386	determinize	call site: 00386	hash_delete
4	58	make_re_binop	call site: 00058	free_re
4	212	state_set_init	call site: 00212	state_set_init_data
3	118	re_case_expand	call site: 00118	free_re
3	291	repeat	call site: 00291	fa_free
3	304	fa_iter	call site: 00304	fa_free
3	320	fa_make_char	call site: 00320	fa_free
2	78	make_re_rep	call site: 00078	free_re
2	87	parse_int	call site: 00087	strndup
2	168	re_as_string	call site: 00168	release_re_str
2	246	fa_from_re	call site: 00246	case_expand

Runtime coverage analysis

Covered functions

479

Functions that are reachable but not covered

37

Reachable functions

163

Percentage of reachable functions covered

77.3%

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
augeas_fa_fuzzer.cc	1
src/fa.c	128
src/ref.c	1
src/memory.c	2
src/hash.c	13

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
aug_save	/src/augeas/src/augeas.c	1	['N/A']	26	0	162	30	11	732	0	4919	195
func_regexp_flag	/src/augeas/src/pathx.c	2	['N/A', 'int']	14	0	83	16	5	80	0	505	45
det_target	/src/augeas/src/jmt.c	4	['N/A', 'N/A', 'N/A', 'int']	5	0	186	26	10	21	0	89	40

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

Functions statically reachable by fuzzers

843 / 972

Cyclomatic complexity statically reachable by fuzzers

6479 / 7067

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.

augeas_escape_name_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=['make_closure', 'builtin_init', 'check_exp', 'pop_value', 'tree_mark_files', 'free_value', 'bind']

augeas_api_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=['make_closure', 'builtin_init', 'unescape', 'push_boolean_value', 'bind', 'tree_fpath_int', 'lookup_internal']

augeas_lens_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=['builtin_init', 'free_module', 'lns_check_rec', 'make_app_ident', 'unescape', 'pop_value', 'make_regexp', 'compile_decl']

augeas_fa_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=['fa_example', 'determinize', 'make_re_binop', 'state_set_init', 're_case_expand', 'repeat', 'fa_iter', 'fa_make_char', 'make_re_rep', 'parse_int']

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
aug_match	48	25	52.08%	['augeas_escape_name_fuzzer', 'augeas_fa_fuzzer']
parse_path_expr	52	18	34.61%	['augeas_escape_name_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
eval_binary	59	23	38.98%	['augeas_escape_name_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
interpreter_init	49	24	48.97%	['augeas_escape_name_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
func_int	31	12	38.70%	['augeas_fa_fuzzer', 'augeas_api_fuzzer']
enc_format_indent	50	11	22.0%	['augeas_escape_name_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
lns_check_rec	53	10	18.86%	['augeas_escape_name_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
str_to_fa	31	11	35.48%	['augeas_escape_name_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
check_decl	35	15	42.85%	['augeas_fa_fuzzer', 'augeas_lens_fuzzer']
compile_rep	38	20	52.63%	['augeas_escape_name_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
print_value	60	15	25.0%	['augeas_escape_name_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_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/augeas/src/./internal.h	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	[]
/src/augeas/src/info.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']
/src/augeas/src/builtin.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']
/src/augeas/src/memory.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer']
/src/augeas/augeas_escape_name_fuzzer.cc	['augeas_escape_name_fuzzer']	['augeas_escape_name_fuzzer']
/src/augeas/augeas_fa_fuzzer.cc	['augeas_fa_fuzzer']	['augeas_fa_fuzzer']
/src/augeas/src/transform.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']
/src/augeas/src/jmt.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']
/src/augeas/src/augeas.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']
/src/augeas/src/lexer.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_lens_fuzzer']
/src/augeas/src/regexp.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_api_fuzzer', 'augeas_lens_fuzzer']
/src/augeas/src/put.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	[]
/src/augeas/src/get.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_api_fuzzer']
/src/augeas/src/lexer.l	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_lens_fuzzer']
/src/augeas/augeas_lens_fuzzer.cc	['augeas_lens_fuzzer']	['augeas_lens_fuzzer']
/src/augeas/src/internal.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']
/src/augeas/src/lens.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_lens_fuzzer']
/src/augeas/src/syntax.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']
/src/augeas/src/ref.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer']
/src/augeas/src/parser.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_lens_fuzzer']
/src/augeas/src/hash.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer']	['augeas_lens_fuzzer', 'augeas_fa_fuzzer']
/src/augeas/src/fa.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer', 'augeas_fa_fuzzer']
/src/augeas/src/ast.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	[]
/src/augeas/src/parser.y	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_lens_fuzzer']
/src/augeas/gnulib/lib/./selinux/selinux.h	[]	[]
/src/augeas/augeas_api_fuzzer.cc	['augeas_api_fuzzer']	['augeas_api_fuzzer']
/src/augeas/src/errcode.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']
/src/augeas/src/pathx.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer', 'augeas_lens_fuzzer']

Directories in report

Directory
/src/augeas/src/
/src/augeas/gnulib/lib/./selinux/
/src/augeas/
/src/augeas/src/./