High level conclusions

Fuzzers reach 88.14% of cyclomatic complexity.

Fuzzers reach 83.74% of all functions.

Fuzzer augeas_api_fuzzer is blocked:

The runtime code coverage of augeas_api_fuzzer covers 22.35% 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_fa_fuzzer is blocked:

The runtime code coverage of augeas_fa_fuzzer covers 3.680% 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

814 / 972

Cyclomatic complexity statically reachable by fuzzers

6225 / 7062

Runtime code coverage of functions

207 / 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_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	644	98.7%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	8	1.22%
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
323	328	LLVMFuzzerTestOneInput	call site: 00328	fa_minimize
157	18	mem_alloc_n	call site: 00018	parse_regexp
130	196	LLVMFuzzerTestOneInput	call site: 00196	fa_from_re
19	176	mem_realloc_n	call site: 00176	free_re
10	7	ref_make_ref	call site: 00007	parse_concat_exp
5	1	LLVMFuzzerTestOneInput	call site: 00001	parse_regexp

Runtime coverage analysis

Covered functions

209

Functions that are reachable but not covered

157

Reachable functions

163

Percentage of reachable functions covered

3.68%

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

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	3468	82.4%
gold	[1:9]	50	1.18%
yellow	[10:29]	13	0.30%
greenyellow	[30:49]	5	0.11%
lawngreen	50+	670	15.9%
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
244	367	eval_binary	call site: 00367	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
74	843	escape	call site: 00843	free_transform
69	1088	module_filename	call site: 01088	load_module_file
43	790	free_value	call site: 00790	free_lens

Runtime coverage analysis

Covered functions

198

Functions that are reachable but not covered

667

Reachable functions

859

Percentage of reachable functions covered

22.35%

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

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	199
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
aug_preview	/src/augeas/src/augeas.c	3	['N/A', 'N/A', 'N/A']	19	0	220	32	12	680	0	4625	39

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

Functions statically reachable by fuzzers

846 / 972

Cyclomatic complexity statically reachable by fuzzers

6516 / 7062

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_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=['LLVMFuzzerTestOneInput', 'mem_alloc_n', 'mem_realloc_n', 'ref_make_ref']

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', 'eval_binary', 'bind', 'tree_fpath_int', 'escape']

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_fa_fuzzer', 'augeas_escape_name_fuzzer']
eval_binary	59	30	50.84%	['augeas_api_fuzzer', 'augeas_fa_fuzzer', 'augeas_escape_name_fuzzer']
free_term	52	19	36.53%	['augeas_api_fuzzer', 'augeas_fa_fuzzer', 'augeas_escape_name_fuzzer']
free_value	43	20	46.51%	['augeas_api_fuzzer', 'augeas_fa_fuzzer', 'augeas_escape_name_fuzzer']
interpreter_init	49	23	46.93%	['augeas_api_fuzzer', 'augeas_fa_fuzzer', 'augeas_escape_name_fuzzer']
check_exp	118	23	19.49%	['augeas_api_fuzzer', 'augeas_fa_fuzzer', 'augeas_escape_name_fuzzer']
func_int	31	12	38.70%	['augeas_api_fuzzer', 'augeas_fa_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/jmt.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/get.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_api_fuzzer']
/src/augeas/src/regexp.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_api_fuzzer']
/src/augeas/src/parser.y	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	[]
/src/augeas/src/put.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	[]
/src/augeas/src/memory.c	['augeas_escape_name_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/lens.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	[]
/src/augeas/src/pathx.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/fa.c	['augeas_escape_name_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/ast.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	[]
/src/augeas/src/hash.c	['augeas_escape_name_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']	[]
/src/augeas/augeas_escape_name_fuzzer.cc	['augeas_escape_name_fuzzer']	['augeas_escape_name_fuzzer']
/src/augeas/src/./internal.h	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	[]
/src/augeas/augeas_fa_fuzzer.cc	['augeas_fa_fuzzer']	['augeas_fa_fuzzer']
/src/augeas/src/info.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/lexer.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	[]
/src/augeas/src/internal.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/errcode.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/ref.c	['augeas_escape_name_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_fa_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/parser.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	[]
/src/augeas/augeas_api_fuzzer.cc	['augeas_api_fuzzer']	['augeas_api_fuzzer']
/src/augeas/src/transform.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/lexer.l	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	[]
/src/augeas/src/builtin.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']
/src/augeas/src/augeas.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']
/src/augeas/gnulib/lib/./selinux/selinux.h	[]	[]
/src/augeas/src/syntax.c	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']	['augeas_escape_name_fuzzer', 'augeas_api_fuzzer']

Directories in report

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