High level conclusions

Fuzzers reach 52.0% code coverage.

Fuzzers reach 0.647% of cyclomatic complexity.

Fuzzers reach 0.780% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

16 / 2050

Cyclomatic complexity statically reachable by fuzzers

29 / 4479

Runtime code coverage of functions

1066 / 2050

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: fuzzfuzz_http

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	2366	96.8%
gold	[1:9]	6	0.24%
yellow	[10:29]	7	0.28%
greenyellow	[30:49]	3	0.12%
lawngreen	50+	61	2.49%
All colors	2443	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
889	975	StatusCode::from_bytes	call site: 00975	Name::into_entry
355	368	PathAndQuery::empty	call site: 00368	recv_invalid_push_promise_headers_is_stream_protocol_error
316	2126	Prioritize::new	call site: 02126	srv_window_update_on_lower_stream_id
258	1866	Table::new	call site: 01866	single_stream_send_extra_large_body_multi_frames_one_buffer
226	126	std::str::from_utf8	call site: 00126	srv_window_update_on_lower_stream_id
73	2	Request::builder	call site: 00002	single_stream_send_extra_large_body_multi_frames_one_buffer
59	889	Method::from_bytes	call site: 00889	StatusCode::from_bytes
34	88	Table::new	call site: 00088	Handle::assert_client_handshake
32	754	parse_hdr	call site: 00754	recv_end_stream_survives_eof
27	860	HeaderValue::from_bytes	call site: 00860	Name::into_entry
16	827	HeaderName::from_bytes	call site: 00827	HeaderMap::try_with_capacity
11	76	FramedWrite::new	call site: 00076	Encoder::new

Runtime coverage analysis

Covered functions

182

Functions that are reachable but not covered

21

Reachable functions

32

Percentage of reachable functions covered

34.38%

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
http/fuzzfuzz_http.rs	7
httprequest.rs	11
h2/tests/h2-tests/tests/flow_control.rs	122
h2/tests/h2-tests/tests/server.rs	61
h2/tests/h2-supportmock.rs	35
httpconvert.rs	6
h2/tests/h2-tests/tests/stream_states.rs	81
h2/tests/h2-tests/tests/prioritization.rs	25
h2server.rs	19
h2client.rs	13
h2codec/framed_read.rs	7
h2codec/mod.rs	13
h2proto/error.rs	2
h2/tests/h2-supportassert.rs	5
h2/tests/h2-supportutil.rs	15
h2ext.rs	8
httpbyte_str.rs	2
httpheader/value.rs	6
httperror.rs	4
h2frame/mod.rs	3
h2/tests/h2-supportframes.rs	21
h2/tests/h2-tests/tests/codec_read.rs	3
h2/tests/h2-supportraw.rs	4
h2/tests/h2-tests/tests/push_promise.rs	41
h2hpack/decoder.rs	8
h2proto/streams/store.rs	12
h2frame/headers.rs	7
httpheader/map.rs	23
h2hpack/header.rs	17
httpuri/builder.rs	2
h2/tests/h2-tests/tests/client_request.rs	36
h2proto/streams/streams.rs	5
h2share.rs	12
h2/tests/h2-supportfuture_ext.rs	13
h2/tests/h2-fuzzmain.rs	20
h2proto/connection.rs	9
h2proto/settings.rs	3
h2lib.rs	1
h2hpack/encoder.rs	1
h2proto/streams/prioritize.rs	2
h2frame/settings.rs	2
http/tests/header_map_fuzz.rs	14
h2hpack/test/fuzz.rs	13
http/tests/status_code.rs	26
httpheader/name.rs	16
h2hpack/table.rs	2
httpmethod.rs	4
httpextensions.rs	8
h2frame/stream_id.rs	3
h2/tests/h2-tests/tests/ping_pong.rs	31
h2proto/ping_pong.rs	6
h2proto/streams/flow_control.rs	8
h2proto/streams/counts.rs	3

Fuzzer: fuzz_hpack

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	2409	90.4%
gold	[1:9]	2	0.07%
yellow	[10:29]	6	0.22%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	246	9.23%
All colors	2663	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
966	1459	take	call site: 01459	single_stream_send_extra_large_body_multi_frames_one_buffer
677	775	Name::into_entry	call site: 00775	Name::into_entry
217	327	Encoder::new	call site: 00327	rst_stream_max
182	94	h2::frame::BytesStr::try_from	call site: 00094	srv_window_update_on_lower_stream_id
82	3	hpack::Decoder::new	call site: 00003	single_stream_send_extra_large_body_multi_frames_one_buffer
48	618	parse_hdr	call site: 00618	Name::into_entry
47	277	Protocol::as_str	call site: 00277	Handle::assert_client_handshake
32	567	parse_hdr	call site: 00567	recv_end_stream_survives_eof
16	2583	Name::into_entry	call site: 02583	Decoder::decode_literal
13	2448	Decoder::decode_indexed	call site: 02448
12	2486	Decoder::try_decode_string	call site: 02486	Frame::map
11	555	parse_hdr	call site: 00555	Frame::map

Runtime coverage analysis

Covered functions

210

Functions that are reachable but not covered

1

Reachable functions

2

Percentage of reachable functions covered

50.0%

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
h2/fuzz/fuzz_targets/fuzz_hpack.rs	2
h2fuzz_bridge.rs	11
h2/tests/h2-tests/tests/flow_control.rs	137
h2/tests/h2-tests/tests/stream_states.rs	81
h2/tests/h2-supportmock.rs	35
httpconvert.rs	6
h2/tests/h2-tests/tests/prioritization.rs	25
h2/tests/h2-tests/tests/server.rs	56
h2/tests/h2-supportassert.rs	5
h2/tests/h2-supportutil.rs	15
h2ext.rs	8
httpbyte_str.rs	2
httpheader/value.rs	6
httprequest.rs	11
httperror.rs	4
h2codec/framed_read.rs	7
h2codec/mod.rs	13
h2proto/error.rs	2
h2frame/mod.rs	3
h2/tests/h2-supportframes.rs	21
h2/tests/h2-tests/tests/codec_read.rs	5
h2/tests/h2-supportraw.rs	4
h2/tests/h2-tests/tests/push_promise.rs	41
h2hpack/decoder.rs	35
h2proto/streams/store.rs	12
h2frame/headers.rs	7
httpheader/map.rs	22
h2hpack/header.rs	18
h2server.rs	19
h2client.rs	13
h2proto/streams/streams.rs	5
h2/tests/h2-supportfuture_ext.rs	13
h2hpack/table.rs	2
http/tests/header_map_fuzz.rs	14
h2hpack/test/fuzz.rs	13
http/tests/status_code.rs	26
httpheader/name.rs	22
httpmethod.rs	4
httpextensions.rs	10
h2frame/settings.rs	2
h2frame/stream_id.rs	3
h2/tests/h2-tests/tests/client_request.rs	36
h2share.rs	12
h2/tests/h2-tests/tests/ping_pong.rs	31
h2lib.rs	1
h2proto/streams/prioritize.rs	3
httpuri/builder.rs	2
h2/tests/h2-fuzzmain.rs	20
h2proto/connection.rs	9
h2proto/settings.rs	3
h2hpack/encoder.rs	18
h2proto/ping_pong.rs	6
h2proto/streams/flow_control.rs	8
h2proto/streams/counts.rs	3
h2proto/streams/buffer.rs	2

Fuzzer: fuzz_client

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	2326	94.8%
gold	[1:9]	8	0.32%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	119	4.85%
All colors	2453	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
516	985	StatusCode::from_bytes	call site: 00985	Name::into_entry
371	1503	frame::Headers::new	call site: 01503	recv_invalid_push_promise_headers_is_stream_protocol_error
323	410	StreamRef::clone_to_opaque	call site: 00410	recv_invalid_push_promise_headers_is_stream_protocol_error
154	2298	Settings::new	call site: 02298	run
145	136	std::str::from_utf8	call site: 00136	srv_window_update_on_lower_stream_id
123	2167	C::o::n::n::e::c::t::i::o::n::::::::n::e::w::streams_config	call site: 02167	srv_window_update_on_lower_stream_id
100	1985	Codec::framed_write	call site: 01985	single_stream_send_extra_large_body_multi_frames_one_buffer
67	899	Method::from_bytes	call site: 00899	StatusCode::from_bytes
60	314	calculate_headermap_size	call site: 00314	Handle::assert_client_handshake
54	30	Request::builder	call site: 00030	single_stream_send_extra_large_body_multi_frames_one_buffer
53	1904	calc_max_continuation_frames	call site: 01904	many_small_final_data_frames_do_not_exhaust_budget
39	858	HeaderName::from_bytes	call site: 00858	Name::into_entry

Runtime coverage analysis

Covered functions

1379

Functions that are reachable but not covered

20

Reachable functions

33

Percentage of reachable functions covered

39.39%

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
h2/fuzz/fuzz_targets/fuzz_client.rs	13
h2/tests/h2-tests/tests/flow_control.rs	122
httprequest.rs	11
h2/tests/h2-tests/tests/server.rs	61
h2/tests/h2-supportmock.rs	35
httpconvert.rs	6
h2/tests/h2-tests/tests/stream_states.rs	81
h2/tests/h2-tests/tests/prioritization.rs	25
h2server.rs	19
h2client.rs	13
h2codec/framed_read.rs	7
h2codec/mod.rs	13
h2proto/error.rs	2
h2/tests/h2-supportassert.rs	5
h2/tests/h2-supportutil.rs	15
h2ext.rs	8
httpbyte_str.rs	2
httpheader/value.rs	6
httperror.rs	4
h2frame/mod.rs	3
h2/tests/h2-supportframes.rs	21
h2/tests/h2-tests/tests/codec_read.rs	3
h2/tests/h2-supportraw.rs	4
h2/tests/h2-tests/tests/push_promise.rs	41
h2hpack/decoder.rs	8
h2proto/streams/store.rs	12
h2frame/headers.rs	7
httpheader/map.rs	23
h2hpack/header.rs	17
httpuri/builder.rs	2
h2/tests/h2-tests/tests/client_request.rs	36
h2proto/streams/streams.rs	5
h2share.rs	12
h2/tests/h2-supportfuture_ext.rs	13
h2/tests/h2-fuzzmain.rs	20
h2proto/connection.rs	9
h2proto/settings.rs	3
h2lib.rs	1
h2hpack/encoder.rs	1
h2proto/streams/prioritize.rs	2
h2frame/settings.rs	2
http/tests/header_map_fuzz.rs	14
h2hpack/test/fuzz.rs	13
http/tests/status_code.rs	26
httpheader/name.rs	16
h2hpack/table.rs	2
httpmethod.rs	4
httpextensions.rs	8
h2frame/stream_id.rs	3
h2/tests/h2-tests/tests/ping_pong.rs	31
h2proto/ping_pong.rs	6
h2proto/streams/flow_control.rs	8
h2proto/streams/counts.rs	3

Fuzzer: fuzz_e2e

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	2201	90.3%
gold	[1:9]	11	0.45%
yellow	[10:29]	6	0.24%
greenyellow	[30:49]	4	0.16%
lawngreen	50+	213	8.74%
All colors	2435	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
314	2120	frame::Headers::new	call site: 02120	recv_invalid_push_promise_headers_is_stream_protocol_error
275	1013	Poll::map_err	call site: 01013	recv_invalid_push_promise_headers_is_stream_protocol_error
219	1899	Settings::new	call site: 01899	recv_invalid_push_promise_headers_is_stream_protocol_error
210	798	StreamId::parse	call site: 00798	recv_invalid_push_promise_headers_is_stream_protocol_error
123	1768	C::o::n::n::e::c::t::i::o::n::::::::n::e::w::streams_config	call site: 01768	srv_window_update_on_lower_stream_id
101	1312	Result::map_err	call site: 01312	run
101	1585	Codec::set_max_send_frame_size	call site: 01585	single_stream_send_extra_large_body_multi_frames_one_buffer
100	0	EP	call site: 00000	single_stream_send_extra_large_body_multi_frames_one_buffer
96	330	Table::new	call site: 00330	recv_invalid_push_promise_headers_is_stream_protocol_error
67	576	parse_hdr	call site: 00576	Name::into_entry
60	437	StreamRef::clone_to_opaque	call site: 00437	AltMap::gen_append
56	181	frame::Settings::ack	call site: 00181	srv_window_update_on_lower_stream_id

Runtime coverage analysis

Covered functions

2160

Functions that are reachable but not covered

18

Reachable functions

43

Percentage of reachable functions covered

58.14%

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
h2/fuzz/fuzz_targets/fuzz_e2e.rs	5
h2/tests/h2-tests/tests/flow_control.rs	122
h2/tests/h2-fuzzmain.rs	20
h2/tests/h2-tests/tests/server.rs	56
h2/tests/h2-supportmock.rs	35
httpconvert.rs	6
h2/tests/h2-tests/tests/stream_states.rs	81
h2/tests/h2-tests/tests/prioritization.rs	25
h2/tests/h2-supportframes.rs	21
h2/tests/h2-supportassert.rs	5
h2/tests/h2-supportutil.rs	15
h2ext.rs	8
httpbyte_str.rs	2
httpheader/value.rs	6
httprequest.rs	11
httperror.rs	4
h2codec/framed_read.rs	7
h2codec/mod.rs	13
h2proto/error.rs	2
h2frame/mod.rs	3
h2/tests/h2-tests/tests/codec_read.rs	3
h2/tests/h2-supportraw.rs	4
h2/tests/h2-tests/tests/push_promise.rs	41
h2hpack/decoder.rs	8
h2proto/streams/store.rs	12
h2frame/headers.rs	7
httpheader/map.rs	22
h2hpack/header.rs	17
h2server.rs	19
h2client.rs	13
h2proto/streams/streams.rs	5
h2/tests/h2-supportfuture_ext.rs	13
http/tests/header_map_fuzz.rs	14
h2hpack/test/fuzz.rs	13
http/tests/status_code.rs	26
httpheader/name.rs	16
h2hpack/table.rs	2
httpmethod.rs	4
httpextensions.rs	8
h2frame/settings.rs	2
h2frame/stream_id.rs	3
h2/tests/h2-tests/tests/client_request.rs	36
h2share.rs	12
h2/tests/h2-tests/tests/ping_pong.rs	31
h2lib.rs	1
h2proto/streams/prioritize.rs	2
httpuri/builder.rs	2
h2proto/ping_pong.rs	6
h2hpack/encoder.rs	1
h2proto/streams/flow_control.rs	8
h2proto/connection.rs	9
h2proto/streams/counts.rs	3
h2proto/settings.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

16 / 2050

Cyclomatic complexity statically reachable by fuzzers

29 / 4479

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.

http/fuzzfuzz_http.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=['StatusCode::from_bytes', 'PathAndQuery::empty', 'Prioritize::new', 'fuzz_target', 'std::str::from_utf8', 'Request::builder', 'Method::from_bytes', 'Table::new', 'parse_hdr', 'HeaderValue::from_bytes']

h2/fuzz/fuzz_targets/fuzz_hpack.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=['take', 'Name::into_entry', 'Encoder::new', 'h2::frame::BytesStr::try_from', 'hpack::Decoder::new', 'parse_hdr', 'Protocol::as_str', 'Decoder::decode_indexed']

h2/fuzz/fuzz_targets/fuzz_client.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=['StatusCode::from_bytes', 'frame::Headers::new', 'StreamRef::clone_to_opaque', 'Settings::new', 'std::str::from_utf8', 'C::o::n::n::e::c::t::i::o::n::::::::n::e::w::streams_config', 'Codec::framed_write', 'Method::from_bytes', 'calculate_headermap_size', 'Request::builder']

h2/fuzz/fuzz_targets/fuzz_e2e.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=['frame::Headers::new', 'Poll::map_err', 'Settings::new', 'StreamId::parse', 'C::o::n::n::e::c::t::i::o::n::::::::n::e::w::streams_config', 'Result::map_err', 'Codec::set_max_send_frame_size', 'Table::new', 'parse_hdr']

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
h2::hpack::encoder::Encoder::encode_header	31	16	51.61%
h2::hpack::table::index_static	79	13	16.45%
parking_lot_core::parking_lot::park::parking_lot::raw_mutex::RawMutex::lock_slow::{closure:#0}, parking_lot::raw_mutex::RawMutex::lock_slow::{closure:#1}, parking_lot::raw_mutex::RawMutex::lock_slow::{closure:#2}::{closure:#0}	62	26	41.93%
parking_lot_core::parking_lot::park::parking_lot::condvar::Condvar::wait_until_internal::{closure:#0}, parking_lot::condvar::Condvar::wait_until_internal::{closure:#1}, parking_lot::condvar::Condvar::wait_until_internal::{closure:#2}::{closure:#0}	62	25	40.32%
tokio::runtime::blocking::pool::Spawner::spawn_task	46	20	43.47%
tokio::runtime::scheduler::multi_thread::queue::Stealalloc::sync::Arctokio::runtime::scheduler::multi_thread::handle::Handle::steal_into2	46	11	23.91%
tokio::runtime::time::handle::Handle::process_at_time	32	13	40.62%
tokio::sync::notify::Notify::inner_notify_waiters	32	9	28.12%
futures_core::task::__internal::atomic_waker::AtomicWaker::register	39	18	46.15%
h2::hpack::table::Table::index_occupied	32	12	37.5%
h2::proto::ping_pong::PingPong::send_pending_ping::fuzz_e2e::MockIo, h2::proto::streams::prioritize::Prioritizedbytes::bytes::Bytes	34	13	38.23%
h2::proto::streams::state::State::recv_open	38	17	44.73%
h2::proto::streams::streams::Inner::recv_headers::bytes::bytes::Bytes::{closure:#0}	33	13	39.39%

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/h2/src/error.rs	[]	[]
/src/h2/src/frame/headers.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/hpack/encoder.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/benches/src/opt_paths.rs	[]	[]
/src/h2/src/proto/streams/stream.rs	[]	[]
/src/h2/src/proto/streams/state.rs	[]	[]
/src/h2/src/frame/reason.rs	[]	[]
/src/http/src/response.rs	[]	[]
/src/h2/src/share.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/benches/src/header_name2.rs	[]	[]
/src/http/benches/src/header_name.rs	[]	[]
/src/h2/tests/h2-tests/tests/server.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	[]
/src/http/benches/src/header_map/basic.rs	[]	[]
/src/h2/src/frame/data.rs	[]	[]
/src/h2/tests/h2-tests/tests/push_promise.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	[]
/src/h2/src/codec/mod.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/proto/streams/recv.rs	[]	[]
/src/http/src/uri/builder.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/src/extensions.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/fuzz_bridge.rs	['fuzz_hpack']	['fuzz_hpack']
/src/h2/tests/h2-support/src/client_ext.rs	[]	[]
/src/http/src/convert.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	[]
/src/http/benches/src/method.rs	[]	[]
/src/h2/src/ext.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/frame/go_away.rs	[]	[]
/src/h2/tests/h2-tests/tests/informational_responses.rs	[]	[]
/src/h2/src/frame/stream_id.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/benches/src/header_map/vec_map.rs	[]	[]
/src/h2/tests/h2-tests/tests/ping_pong.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	[]
/src/h2/tests/h2-tests/tests/prioritization.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzz_client', 'fuzz_e2e']
/src/h2/src/hpack/huffman/mod.rs	[]	[]
/src/http/src/byte_str.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/tests/header_map.rs	[]	[]
/src/http/src/status.rs	[]	[]
/src/h2/tests/h2-tests/tests/hammer.rs	[]	[]
/src/http/src/uri/scheme.rs	[]	[]
/src/h2/tests/h2-support/src/util.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzz_client', 'fuzz_e2e']
/src/h2/src/proto/streams/streams.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/util/genhuff/src/main.rs	[]	[]
/src/http/src/lib.rs	[]	[]
/src/http/src/uri/mod.rs	[]	[]
/src/http/src/error.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/fuzz/fuzz_targets/fuzz_client.rs	['fuzz_client']	['fuzz_client']
/src/h2/src/proto/streams/buffer.rs	['fuzz_hpack']	['fuzz_hpack']
/src/http/src/header/value.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/src/version.rs	[]	[]
/src/h2/src/proto/error.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzz_e2e']
/src/h2/src/proto/streams/prioritize.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/tests/h2-tests/tests/stream_states.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	[]
/src/h2/src/frame/window_update.rs	[]	[]
/src/h2/tests/h2-tests/tests/trailers.rs	[]	[]
/src/h2/src/server.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/hpack/test/fuzz.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/src/uri/port.rs	[]	[]
/src/http/src/uri/path.rs	[]	[]
/src/http/tests/patterns.rs	[]	[]
/src/h2/src/frame/reset.rs	[]	[]
/src/h2/src/hpack/header.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/tests/h2-support/src/future_ext.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzz_client', 'fuzz_e2e']
/src/h2/tests/h2-support/src/raw.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzz_client', 'fuzz_e2e']
/src/h2/fuzz/fuzz_targets/fuzz_hpack.rs	['fuzz_hpack']	[]
/src/h2/tests/h2-support/src/frames.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/tests/h2-support/src/trace.rs	[]	[]
/src/h2/tests/h2-support/src/assert.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	[]
/src/h2/tests/h2-tests/tests/flow_control.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/src/header/name.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/frame/priority.rs	[]	[]
/src/h2/src/proto/peer.rs	[]	[]
/src/http/util/src/main.rs	[]	[]
/src/http/src/header/map.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/tests/h2-support/src/prelude.rs	[]	[]
/src/h2/src/codec/error.rs	[]	[]
/src/http/fuzz/src/fuzz_http.rs	['fuzzfuzz_http']	[]
/src/h2/src/frame/util.rs	[]	[]
/src/http/tests/status_code.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/tests/h2-support/src/mock.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/tests/header_map_fuzz.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/client.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/benches/src/uri.rs	[]	[]
/src/h2/src/hpack/huffman/encode.rs	[]	[]
/src/h2/src/proto/go_away.rs	[]	[]
/src/h2/src/proto/connection.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/proto/ping_pong.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/proto/streams/counts.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/tests/h2-tests/tests/codec_read.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	[]
/src/h2/src/frame/mod.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzz_e2e']
/src/h2/src/codec/framed_read.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/hpack/huffman/decode.rs	[]	[]
/src/h2/src/hpack/decoder.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/codec/framed_write.rs	[]	[]
/src/h2/src/hpack/test/fixture.rs	[]	[]
/src/http/src/method.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/tests/h2-tests/tests/codec_write.rs	[]	[]
/src/h2/src/proto/streams/store.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/http/src/uri/authority.rs	[]	[]
/src/h2/src/hpack/table.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/tests/h2-support/src/lib.rs	[]	[]
/src/h2/src/lib.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzz_client', 'fuzz_e2e']
/src/http/benches/src/header_value.rs	[]	[]
/src/h2/src/proto/streams/send.rs	[]	[]
/src/h2/tests/h2-tests/tests/client_request.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzz_client', 'fuzz_e2e']
/src/h2/benches/main.rs	[]	[]
/src/h2/src/proto/streams/mod.rs	[]	[]
/src/http/src/request.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/fuzz/fuzz_targets/fuzz_e2e.rs	['fuzz_e2e']	['fuzz_e2e']
/src/http/src/uri/tests.rs	[]	[]
/src/h2/src/proto/streams/flow_control.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/frame/head.rs	[]	[]
/src/h2/src/frame/settings.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/proto/settings.rs	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']	['fuzzfuzz_http', 'fuzz_hpack', 'fuzz_client', 'fuzz_e2e']
/src/h2/src/frame/ping.rs	[]	[]

Directories in report

Directory
/src/h2/src/
/src/h2/src/hpack/test/
/src/http/benches/src/header_map/
/src/h2/src/hpack/huffman/
/src/http/src/
/src/h2/tests/h2-tests/tests/
/src/h2/src/codec/
/src/http/fuzz/src/
/src/h2/benches/
/src/http/src/header/
/src/h2/fuzz/fuzz_targets/
/src/http/tests/
/src/h2/tests/h2-support/src/
/src/h2/src/proto/
/src/h2/src/proto/streams/
/src/http/src/uri/
/src/h2/src/frame/
/src/http/util/src/
/src/h2/src/hpack/
/src/http/benches/src/
/src/h2/util/genhuff/src/

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