High level conclusions

Fuzzers reach 54.81% code coverage.

Fuzzers reach 1.997% of cyclomatic complexity.

Fuzzers reach 1.376% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

18 / 1308

Cyclomatic complexity statically reachable by fuzzers

45 / 2253

Runtime code coverage of functions

717 / 1308

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: fuzz-aat

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	396	95.6%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	3	0.72%
lawngreen	50+	15	3.62%
All colors	414	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
180	33	Stream::read_bytes	call site: 00033	DeltaSetIndexMap::map
129	218	Stream::read_bytes	call site: 00218	ItemVariationStore::parse_delta
38	375	Lookup::value	call site: 00375	Lookup::parse
25	349	Stream::read_bytes	call site: 00349	DeltaSetIndexMap::map
15	3	LazyArray16::len	call site: 00003	u16_to_u8_vec
8	22	u16_to_u8_vec	call site: 00022	Lookup::parse
1	0	EP	call site: 00000

Runtime coverage analysis

Covered functions

30

Functions that are reachable but not covered

13

Reachable functions

19

Percentage of reachable functions covered

31.58%

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
fuzz/fuzz_targets/fuzz-aat.rs	14
src/parser.rs	12
tests/tables/cff2.rs	2
src/aat.rs	24
tests/tables/glyf.rs	17
tests/tables/colr.rs	2
tests/tables/loca.rs	9
tests/tables/main.rs	2
tests/tables/cff1.rs	8
src/delta_set.rs	12
c-api/lib.rs	9
src/tables/hvar.rs	5
src/var_store.rs	16
src/lib.rs	4

Fuzzer: fuzz-cpal

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	349	90.8%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	35	9.11%
All colors	384	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
126	10	Stream::read_bytes	call site: 00010	diamond_font
64	198	Stream::read_bytes	call site: 00198	ItemVariationStore::parse_delta
63	264	Stream::new_at	call site: 00264	RegionAxisCoordinatesRecord::evaluate_axis
55	138	VecPainter::outline_glyph	call site: 00138	DeltaSetIndexMap::map
35	329	Stream::read_bytes	call site: 00329	Stream::read
4	3	LazyArray16::len	call site: 00003	Stream::read
1	0	EP	call site: 00000
1	382	VecPainter::paint	call site: 00382

Runtime coverage analysis

Covered functions

169

Functions that are reachable but not covered

2

Reachable functions

8

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.

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
fuzz/fuzz_targets/fuzz-cpal.rs	8
src/parser.rs	11
src/aat.rs	25
tests/tables/glyf.rs	17
tests/tables/cff2.rs	2
tests/tables/colr.rs	11
tests/tables/loca.rs	9
tests/tables/main.rs	2
tests/tables/cff1.rs	8
src/delta_set.rs	12
c-api/lib.rs	9
src/tables/hvar.rs	5
src/var_store.rs	16
src/lib.rs	4

Fuzzer: fuzz-table-with-builder

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	782	75.9%
gold	[1:9]	7	0.67%
yellow	[10:29]	2	0.19%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	239	23.2%
All colors	1030	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
113	916	Table::parse_inner	call site: 00916	shared_component_fan_out_is_bounded_by_the_visit_budget
107	11	Stream::read_bytes	call site: 00011	diamond_font
105	471	Face::parse_tables	call site: 00471	Table::parse_inner
67	119	LazyArray16::len	call site: 00119	DeltaSetIndexMap::map
64	200	Stream::read_bytes	call site: 00200	ItemVariationStore::parse_delta
63	266	Stream::new_at	call site: 00266	RegionAxisCoordinatesRecord::evaluate_axis
54	724	LazyArray16::get	call site: 00724	DeltaSetIndexMap::map
46	331	Stream::read_bytes	call site: 00331	Face::parse
28	684	parse_top_dict	call site: 00684	Cff2::build
19	881	parse_private_dict	call site: 00881	Stream::read_bytes
16	418	Face::parse_tables	call site: 00418	Stream::read
16	436	Face::parse_tables	call site: 00436	Stream::read

Runtime coverage analysis

Covered functions

210

Functions that are reachable but not covered

16

Reachable functions

36

Percentage of reachable functions covered

55.56%

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.

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
fuzz/fuzz_targets/fuzz-table-with-builder.rs	9
src/parser.rs	14
src/aat.rs	36
tests/tables/glyf.rs	20
tests/tables/cff2.rs	28
tests/tables/colr.rs	2
tests/tables/loca.rs	9
tests/tables/main.rs	2
tests/tables/cff1.rs	8
src/delta_set.rs	12
c-api/lib.rs	9
src/tables/hvar.rs	5
src/var_store.rs	16
src/lib.rs	25
src/tables/cff/cff1.rs	35
src/tables/cff/cff2.rs	14
src/tables/cff/dict.rs	29
src/tables/cff/charset.rs	14
src/tables/cff/encoding.rs	8
src/tables/math.rs	5

Fuzzer: fuzz-glyph-index

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	721	70.2%
gold	[1:9]	10	0.97%
yellow	[10:29]	8	0.77%
greenyellow	[30:49]	5	0.48%
lawngreen	50+	283	27.5%
All colors	1027	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
81	38	LazyArray16::len	call site: 00038
64	201	Stream::read_bytes	call site: 00201	ItemVariationStore::parse_delta
63	267	Stream::new_at	call site: 00267	RegionAxisCoordinatesRecord::evaluate_axis
57	120	LazyArray16::len	call site: 00120	DeltaSetIndexMap::map
53	702	LazyArray16::last	call site: 00702	DeltaSetIndexMap::map
50	635	parse_top_dict	call site: 00635	Cff2::build
39	987	Face::parse_tables	call site: 00987	DeltaSetIndexMap::map
26	11	RawFace::parse	call site: 00011	diamond_font
19	858	parse_private_dict	call site: 00858	Stream::read_bytes
17	423	Face::parse_tables	call site: 00423	Stream::read
17	444	Face::parse_tables	call site: 00444	Stream::read
17	507	Face::parse_tables	call site: 00507	Stream::read

Runtime coverage analysis

Covered functions

367

Functions that are reachable but not covered

13

Reachable functions

28

Percentage of reachable functions covered

53.57%

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
fuzz/fuzz_targets/fuzz-glyph-index.rs	3
src/aat.rs	36
tests/tables/glyf.rs	20
tests/tables/cff2.rs	28
src/parser.rs	14
tests/tables/loca.rs	9
tests/tables/main.rs	2
tests/tables/cff1.rs	8
src/delta_set.rs	12
tests/tables/colr.rs	2
c-api/lib.rs	19
src/tables/hvar.rs	5
src/var_store.rs	16
src/lib.rs	25
src/tables/cff/cff1.rs	35
src/tables/cff/cff2.rs	14
src/tables/cff/dict.rs	29
src/tables/cff/charset.rs	14
src/tables/cff/encoding.rs	8
src/tables/math.rs	5
src/tables/name.rs	1

Fuzzer: fuzz-variable-outline

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	718	66.9%
gold	[1:9]	19	1.77%
yellow	[10:29]	10	0.93%
greenyellow	[30:49]	12	1.11%
lawngreen	50+	313	29.1%
All colors	1072	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
81	38	LazyArray16::len	call site: 00038
57	120	LazyArray16::len	call site: 00120	DeltaSetIndexMap::map
53	702	LazyArray16::last	call site: 00702	DeltaSetIndexMap::map
50	635	parse_top_dict	call site: 00635	Cff2::build
36	201	Stream::read_bytes	call site: 00201	Table::parse
27	238	Face::is_variable	call site: 00238	ItemVariationStore::parse_delta
26	11	RawFace::parse	call site: 00011	diamond_font
22	267	Stream::new_at	call site: 00267	diamond_font
22	308	VarCoords::as_slice	call site: 00308	Face::glyph_phantom_points
21	987	Face::parse_tables	call site: 00987	shared_component_fan_out_is_bounded_by_the_visit_budget
19	858	parse_private_dict	call site: 00858	Stream::read_bytes
17	423	Face::parse_tables	call site: 00423	Stream::read

Runtime coverage analysis

Covered functions

533

Functions that are reachable but not covered

15

Reachable functions

35

Percentage of reachable functions covered

57.14%

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
fuzz/fuzz_targets/fuzz-variable-outline.rs	9
src/aat.rs	36
tests/tables/glyf.rs	20
tests/tables/cff2.rs	28
src/parser.rs	16
tests/tables/loca.rs	9
tests/tables/main.rs	2
tests/tables/cff1.rs	8
src/delta_set.rs	12
tests/tables/colr.rs	2
c-api/lib.rs	21
src/tables/hvar.rs	5
src/var_store.rs	16
src/lib.rs	28
src/tables/cff/cff1.rs	35
src/tables/cff/cff2.rs	14
src/tables/cff/dict.rs	29
src/tables/cff/charset.rs	14
src/tables/cff/encoding.rs	8
src/tables/math.rs	5
src/tables/fvar.rs	2
src/tables/avar.rs	13

Fuzzer: fuzz-table

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	813	77.5%
gold	[1:9]	140	13.3%
yellow	[10:29]	57	5.43%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	39	3.71%
All colors	1049	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
107	13	Stream::read_bytes	call site: 00013	diamond_font
70	602	LazyArray16::is_empty	call site: 00602	gen_cff
60	121	LazyArray16::len	call site: 00121	DeltaSetIndexMap::map
51	422	Stream::read_bytes	call site: 00422	Stream::read
45	674	Subtable0::glyphs_kerning	call site: 00674	Table::glyph_range
42	858	Table::glyph_class	call site: 00858	Stream::read
38	768	Constants::read_i16	call site: 00768	shared_component_fan_out_is_bounded_by_the_visit_budget
37	994	vhea::Table::parse	call site: 00994	Stream::read
35	363	DeltaSetIndexMap::map	call site: 00363	DeltaSetIndexMap::map
35	822	avar::Table::parse	call site: 00822	Stream::read
31	204	DeltaSetIndexMap::map	call site: 00204	Table::advance_offset
31	570	Subtable0::glyphs_kerning	call site: 00570	gen_cff

Runtime coverage analysis

Covered functions

365

Functions that are reachable but not covered

4

Reachable functions

54

Percentage of reachable functions covered

92.59%

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
fuzz/fuzz_targets/fuzz-table.rs	52
src/parser.rs	15
src/aat.rs	31
tests/tables/glyf.rs	20
tests/tables/cff2.rs	3
tests/tables/colr.rs	2
tests/tables/loca.rs	9
tests/tables/main.rs	2
tests/tables/cff1.rs	22
src/delta_set.rs	12
c-api/lib.rs	19
src/tables/hvar.rs	5
src/var_store.rs	16
src/lib.rs	5
src/tables/name.rs	8
tests/tables/cmap.rs	9
src/tables/kerx.rs	4
src/tables/loca.rs	4
src/tables/math.rs	8
src/tables/gdef.rs	2
src/tables/mvar.rs	3
src/tables/stat.rs	1
src/tables/vvar.rs	3

Fuzzer: fuzz-outline

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	703	69.6%
gold	[1:9]	15	1.48%
yellow	[10:29]	4	0.39%
greenyellow	[30:49]	2	0.19%
lawngreen	50+	286	28.3%
All colors	1010	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
81	38	LazyArray16::len	call site: 00038
64	201	Stream::read_bytes	call site: 00201	ItemVariationStore::parse_delta
57	120	LazyArray16::len	call site: 00120	DeltaSetIndexMap::map
53	702	LazyArray16::last	call site: 00702	DeltaSetIndexMap::map
50	635	parse_top_dict	call site: 00635	Cff2::build
26	11	RawFace::parse	call site: 00011	diamond_font
22	267	Stream::new_at	call site: 00267	diamond_font
22	308	VarCoords::as_slice	call site: 00308	Face::glyph_phantom_points
22	987	Face::parse_tables	call site: 00987	shared_component_fan_out_is_bounded_by_the_visit_budget
19	858	parse_private_dict	call site: 00858	Stream::read_bytes
17	423	Face::parse_tables	call site: 00423	Stream::read
17	444	Face::parse_tables	call site: 00444	Stream::read

Runtime coverage analysis

Covered functions

518

Functions that are reachable but not covered

14

Reachable functions

31

Percentage of reachable functions covered

54.84%

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
fuzz/fuzz_targets/fuzz-outline.rs	6
src/aat.rs	36
tests/tables/glyf.rs	20
tests/tables/cff2.rs	28
src/parser.rs	14
tests/tables/loca.rs	9
tests/tables/main.rs	2
tests/tables/cff1.rs	8
src/delta_set.rs	12
tests/tables/colr.rs	2
c-api/lib.rs	10
src/tables/hvar.rs	5
src/var_store.rs	16
src/lib.rs	25
src/tables/cff/cff1.rs	35
src/tables/cff/cff2.rs	14
src/tables/cff/dict.rs	29
src/tables/cff/charset.rs	14
src/tables/cff/encoding.rs	8
src/tables/math.rs	5

Fuzzer: fuzz-base

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	875	64.2%
gold	[1:9]	15	1.10%
yellow	[10:29]	1	0.07%
greenyellow	[30:49]	7	0.51%
lawngreen	50+	463	34.0%
All colors	1361	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
107	15	RawFace::parse	call site: 00015	diamond_font
60	1200	Name::is_unicode	call site: 01200	DeltaSetIndexMap::map
53	704	LazyArray16::last	call site: 00704	DeltaSetIndexMap::map
50	123	LazyArray16::len	call site: 00123	DeltaSetIndexMap::map
50	638	parse_top_dict	call site: 00638	Cff2::build
37	1101	Table::windows_descender	call site: 01101	DeltaSetIndexMap::map
31	1302	Face::permissions	call site: 01302	Table::advance_offset
29	211	DeltaSetIndexMap::map	call site: 00211	Table::parse
23	1144	Face::style	call site: 01144	DeltaSetIndexMap::map
18	989	Face::parse_tables	call site: 00989	shared_component_fan_out_is_bounded_by_the_visit_budget
17	316	Face::glyph_phantom_points	call site: 00316	u16::try_num_from
17	426	Face::parse_tables	call site: 00426	Stream::read

Runtime coverage analysis

Covered functions

642

Functions that are reachable but not covered

22

Reachable functions

77

Percentage of reachable functions covered

71.43%

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
fuzz/fuzz_targets/fuzz-base.rs	43
src/parser.rs	15
src/aat.rs	36
tests/tables/glyf.rs	22
tests/tables/cff2.rs	28
tests/tables/loca.rs	9
tests/tables/main.rs	5
tests/tables/cff1.rs	8
src/delta_set.rs	12
tests/tables/colr.rs	6
c-api/lib.rs	52
src/tables/hvar.rs	6
src/var_store.rs	16
src/lib.rs	32
src/tables/cff/cff1.rs	35
src/tables/cff/cff2.rs	14
src/tables/cff/dict.rs	29
src/tables/cff/charset.rs	14
src/tables/cff/encoding.rs	8
src/tables/math.rs	5
src/tables/name.rs	8
src/language.rs	2
src/tables/os2/mod.rs	6
src/tables/svg.rs	5
src/tables/sbix.rs	3
src/tables/vvar.rs	3

Optimal target analysis

Remaining optimal interesting functions

The following table shows a list of functions that are optimal targets. Optimal targets are identified by finding the functions that in combination, yield a high code coverage.

Func name	Functions filename	Arg count	Args	Function depth	hitcount	instr count	bb count	cyclomatic complexity	Reachable functions	Incoming references	total cyclomatic complexity	Unreached complexity

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

Functions statically reachable by fuzzers

18 / 1308

Cyclomatic complexity statically reachable by fuzzers

45 / 2253

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.

fuzz/fuzz_targets/fuzz-aat.rs

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=['Stream::read_bytes', 'Lookup::value', 'LazyArray16::len', 'u16_to_u8_vec']

fuzz/fuzz_targets/fuzz-cpal.rs

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=['Stream::read_bytes', 'Stream::new_at', 'VecPainter::outline_glyph', 'LazyArray16::len', 'VecPainter::paint']

fuzz/fuzz_targets/fuzz-table-with-builder.rs

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=['Table::parse_inner', 'Stream::read_bytes', 'Face::parse_tables', 'LazyArray16::len', 'Stream::new_at', 'LazyArray16::get', 'parse_top_dict', 'parse_private_dict']

fuzz/fuzz_targets/fuzz-glyph-index.rs

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=['LazyArray16::len', 'Stream::read_bytes', 'Stream::new_at', 'LazyArray16::last', 'parse_top_dict', 'Face::parse_tables', 'RawFace::parse', 'parse_private_dict']

fuzz/fuzz_targets/fuzz-variable-outline.rs

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=['LazyArray16::len', 'LazyArray16::last', 'parse_top_dict', 'Stream::read_bytes', 'Face::is_variable', 'RawFace::parse', 'Stream::new_at', 'VarCoords::as_slice', 'Face::parse_tables']

fuzz/fuzz_targets/fuzz-table.rs

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=['Stream::read_bytes', 'LazyArray16::is_empty', 'LazyArray16::len', 'Subtable0::glyphs_kerning', 'Table::glyph_class', 'Constants::read_i16', 'vhea::Table::parse', 'DeltaSetIndexMap::map', 'avar::Table::parse']

fuzz/fuzz_targets/fuzz-outline.rs

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=['LazyArray16::len', 'Stream::read_bytes', 'LazyArray16::last', 'parse_top_dict', 'RawFace::parse', 'Stream::new_at', 'VarCoords::as_slice', 'Face::parse_tables', 'parse_private_dict']

fuzz/fuzz_targets/fuzz-base.rs

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=['RawFace::parse', 'Name::is_unicode', 'LazyArray16::last', 'LazyArray16::len', 'parse_top_dict', 'Table::windows_descender', 'Face::permissions', 'DeltaSetIndexMap::map', 'Face::style', 'Face::parse_tables']

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
ttf_parser::aat::LookupInner::value	33	16	48.48%
ttf_parser::tables::cbdt::Table::get	81	23	28.39%

New fuzzers

The below fuzzers are templates and suggestions for how to target the set of optimal functions above

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/ttf-parser/src/tables/gsub.rs	[]	[]
/src/ttf-parser/src/tables/trak.rs	[]	[]
/src/ttf-parser/src/tables/cblc.rs	[]	[]
/src/ttf-parser/fuzz/fuzz_targets/fuzz-base.rs	['fuzz-base']	['fuzz-base']
/src/ttf-parser/src/tables/cmap/format12.rs	[]	[]
/src/ttf-parser/src/tables/kerx.rs	['fuzz-table']	['fuzz-table']
/src/ttf-parser/src/tables/cmap/format4.rs	[]	[]
/src/ttf-parser/src/tables/morx.rs	[]	[]
/src/ttf-parser/src/tables/avar.rs	['fuzz-variable-outline']	['fuzz-variable-outline']
/src/ttf-parser/src/tables/sbix.rs	['fuzz-base']	['fuzz-base']
/src/ttf-parser/fuzz/fuzz_targets/fuzz-table.rs	['fuzz-table']	[]
/src/ttf-parser/src/tables/cff/mod.rs	[]	[]
/src/ttf-parser/tests/tables/colr.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/src/ggg/mod.rs	[]	[]
/src/ttf-parser/src/lib.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/src/tables/os2/panose.rs	[]	[]
/src/ttf-parser/tests/tables/hmtx.rs	[]	[]
/src/ttf-parser/tests/tables/cff2.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/tests/tables/gvar.rs	[]	[]
/src/ttf-parser/src/tables/cff/argstack.rs	[]	[]
/src/ttf-parser/tests/tables/ankr.rs	[]	[]
/src/ttf-parser/src/tables/cmap/format14.rs	[]	[]
/src/ttf-parser/fuzz/fuzz_targets/fuzz-outline.rs	['fuzz-outline']	[]
/src/ttf-parser/c-api/lib.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	[]
/src/ttf-parser/src/tables/cff/index.rs	[]	[]
/src/ttf-parser/fuzz/fuzz_targets/fuzz-glyph-index.rs	['fuzz-glyph-index']	[]
/src/ttf-parser/tests/tables/sbix.rs	[]	[]
/src/ttf-parser/fuzz/fuzz_targets/fuzz-table-with-builder.rs	['fuzz-table-with-builder']	[]
/src/ttf-parser/tests/tables/avar.rs	[]	[]
/src/ttf-parser/benches/methods_perf.rs	[]	[]
/src/ttf-parser/src/tables/gdef.rs	['fuzz-table']	['fuzz-table']
/src/ttf-parser/src/ggg/context.rs	[]	[]
/src/ttf-parser/examples/font2svg.rs	[]	[]
/src/ttf-parser/src/tables/gpos.rs	[]	[]
/src/ttf-parser/tests/tables/fvar.rs	[]	[]
/src/ttf-parser/src/tables/cmap/mod.rs	[]	[]
/src/ttf-parser/tests/tables/main.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	[]
/src/ttf-parser/src/tables/math.rs	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/src/tables/vorg.rs	[]	[]
/src/ttf-parser/tests/tables/cmap.rs	['fuzz-table']	[]
/src/ttf-parser/tests/tables/trak.rs	[]	[]
/src/ttf-parser/src/tables/gvar.rs	[]	[]
/src/ttf-parser/tests/tables/panose.rs	[]	[]
/src/ttf-parser/src/tables/cff/charstring.rs	[]	[]
/src/ttf-parser/src/tables/cmap/format0.rs	[]	[]
/src/ttf-parser/src/tables/hvar.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-base']
/src/ttf-parser/src/tables/cff/cff2.rs	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/fuzz/fuzz_targets/fuzz-cpal.rs	['fuzz-cpal']	['fuzz-cpal']
/src/ttf-parser/src/ggg/feature_variations.rs	[]	[]
/src/ttf-parser/src/ggg/lookup.rs	[]	[]
/src/ttf-parser/src/tables/post.rs	[]	[]
/src/ttf-parser/benches/methods_perf_x1000.rs	[]	[]
/src/ttf-parser/src/ggg/layout_table.rs	[]	[]
/src/ttf-parser/src/var_store.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/src/tables/mvar.rs	['fuzz-table']	['fuzz-table']
/src/ttf-parser/tests/tables/aat.rs	[]	[]
/src/ttf-parser/src/tables/fvar.rs	['fuzz-variable-outline']	['fuzz-variable-outline']
/src/ttf-parser/src/ggg/chained_context.rs	[]	[]
/src/ttf-parser/src/tables/vvar.rs	['fuzz-table', 'fuzz-base']	['fuzz-table', 'fuzz-base']
/src/ttf-parser/src/tables/loca.rs	['fuzz-table']	['fuzz-table']
/src/ttf-parser/src/tables/glyf.rs	[]	[]
/src/ttf-parser/tests/tables/maxp.rs	[]	[]
/src/ttf-parser/src/delta_set.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/tests/tables/head.rs	[]	[]
/src/ttf-parser/src/tables/ankr.rs	[]	[]
/src/ttf-parser/src/aat.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/fuzz/fuzz_targets/fuzz-aat.rs	['fuzz-aat']	['fuzz-aat']
/src/ttf-parser/src/language.rs	['fuzz-base']	['fuzz-base']
/src/ttf-parser/src/tables/cpal.rs	[]	[]
/src/ttf-parser/src/tables/stat.rs	['fuzz-table']	['fuzz-table']
/src/ttf-parser/src/tables/svg.rs	['fuzz-base']	['fuzz-base']
/src/ttf-parser/tests/tables/glyf.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-table-with-builder', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/src/tables/os2/mod.rs	['fuzz-base']	['fuzz-base']
/src/ttf-parser/src/tables/cmap/format13.rs	[]	[]
/src/ttf-parser/src/tables/cmap/format2.rs	[]	[]
/src/ttf-parser/tests/tables/loca.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	[]
/src/ttf-parser/tests/tables/cff1.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/src/tables/cff/encoding.rs	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/src/tables/cff/cff1.rs	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/tests/bitmap.rs	[]	[]
/src/ttf-parser/src/parser.rs	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']	['fuzz-aat', 'fuzz-cpal', 'fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-table', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/src/tables/kern.rs	[]	[]
/src/ttf-parser/src/tables/feat.rs	[]	[]
/src/ttf-parser/examples/font-info.rs	[]	[]
/src/ttf-parser/src/tables/name.rs	['fuzz-glyph-index', 'fuzz-table', 'fuzz-base']	['fuzz-glyph-index', 'fuzz-table', 'fuzz-base']
/src/ttf-parser/src/tables/cff/dict.rs	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']
/src/ttf-parser/src/tables/cmap/format10.rs	[]	[]
/src/ttf-parser/src/tables/cmap/format6.rs	[]	[]
/src/ttf-parser/src/tables/hmtx.rs	[]	[]
/src/ttf-parser/src/tables/colr.rs	[]	[]
/src/ttf-parser/fuzz/fuzz_targets/fuzz-variable-outline.rs	['fuzz-variable-outline']	['fuzz-variable-outline']
/src/ttf-parser/src/tables/cff/charset.rs	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']	['fuzz-table-with-builder', 'fuzz-glyph-index', 'fuzz-variable-outline', 'fuzz-outline', 'fuzz-base']

Directories in report

Directory
/src/ttf-parser/src/
/src/ttf-parser/tests/
/src/ttf-parser/examples/
/src/ttf-parser/src/tables/cff/
/src/ttf-parser/fuzz/fuzz_targets/
/src/ttf-parser/benches/
/src/ttf-parser/src/tables/cmap/
/src/ttf-parser/c-api/
/src/ttf-parser/src/ggg/
/src/ttf-parser/tests/tables/
/src/ttf-parser/src/tables/
/src/ttf-parser/src/tables/os2/

This section shows a list of 3rd party function calls and their relative coverage information. By static analysis of the target project code, all of the 3rd party function call and their caller information, including the source file and line number that initiate the call are captured. The caller source code file and line number are shown in column 2 while column 1 is the function name of the 3rd party function call. Each occurrent of the 3rd party function call will occuply a separate row. Column 3 of each row indicate if the 3rd party call in the source file line is unreachable. Column 4 lists all fuzzers that have covered that particular system call in that specific location (source file and line)during their dynamic fuzzing.

Function in each files in report

Target sink	Callsite location	Reached by fuzzer	Covered by Fuzzers