High level conclusions

Fuzzers reach 56.52% code coverage.

Fuzzers reach 0.725% of cyclomatic complexity.

Fuzzers reach 0.832% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

16 / 1923

Cyclomatic complexity statically reachable by fuzzers

29 / 4000

Runtime code coverage of functions

1087 / 1923

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	1960	98.5%
gold	[1:9]	5	0.25%
yellow	[10:29]	5	0.25%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	19	0.95%
All colors	1989	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
880	431	PathAndQuery::empty	call site: 00431	single_stream_send_extra_large_body_multi_frames_one_buffer
458	1352	Prioritize::new	call site: 01352	srv_window_update_on_lower_stream_id
292	123	std::str::from_utf8	call site: 00123	srv_window_update_on_lower_stream_id
149	1814	Table::new	call site: 01814	rst_stream_max
95	24	Table::new	call site: 00024	single_stream_send_extra_large_body_multi_frames_one_buffer
37	1313	Recv::new	call site: 01313	FlowControl::inc_window
15	2	Request::builder	call site: 00002	Codec::with_max_recv_frame_size
11	416	Pos::is_some	call site: 00416	if_downcast_into
10	1977	StatusCode::from_bytes	call site: 01977	Frame::map
5	18	FramedWrite::new	call site: 00018	Encoder::new
3	1964	StatusCode::from_bytes	call site: 01964	HeaderName::as_ref
2	1811	Table::new	call site: 01811

Runtime coverage analysis

Covered functions

180

Functions that are reachable but not covered

23

Reachable functions

34

Percentage of reachable functions covered

32.35%

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.

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	13
h2/tests/h2-supportmock.rs	91
h2/tests/h2-tests/tests/server.rs	61
h2client.rs	13
h2codec/mod.rs	13
h2/tests/h2-tests/tests/stream_states.rs	71
httpconvert.rs	6
h2/tests/h2-tests/tests/prioritization.rs	25
h2server.rs	19
h2codec/framed_read.rs	7
h2proto/error.rs	2
h2/tests/h2-supportassert.rs	5
h2/tests/h2-supportutil.rs	14
h2ext.rs	7
httpbyte_str.rs	2
httpheader/value.rs	1
h2/tests/h2-tests/tests/flow_control.rs	60
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	37
h2hpack/decoder.rs	8
h2proto/streams/store.rs	6
h2frame/headers.rs	7
httpheader/map.rs	15
h2hpack/header.rs	2
h2/tests/h2-fuzzmain.rs	31
h2proto/streams/streams.rs	6
h2/tests/h2-supportfuture_ext.rs	13
h2/tests/h2-tests/tests/client_request.rs	25
httpuri/builder.rs	2
h2share.rs	12
h2proto/connection.rs	9
h2proto/settings.rs	3
h2/tests/h2-supportclient_ext.rs	7
h2lib.rs	1
h2hpack/encoder.rs	1
h2proto/streams/prioritize.rs	2
h2frame/settings.rs	2
h2proto/streams/flow_control.rs	11
h2proto/streams/recv.rs	10
h2/tests/h2-tests/tests/ping_pong.rs	31
h2proto/ping_pong.rs	8
h2hpack/table.rs	2
http/tests/status_code.rs	7

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	2108	90.3%
gold	[1:9]	2	0.08%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	2	0.08%
lawngreen	50+	222	9.51%
All colors	2334	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
1144	805	take	call site: 00805	single_stream_send_extra_large_body_multi_frames_one_buffer
528	269	HeaderName::as_str	call site: 00269	srv_window_update_on_lower_stream_id
180	83	h2::frame::BytesStr::try_from	call site: 00083	srv_window_update_on_lower_stream_id
56	18	Encoder::new	call site: 00018	single_stream_send_extra_large_body_multi_frames_one_buffer
17	2205	Header::new	call site: 02205	HeaderValue::from_bytes
16	2256	Name::into_entry	call site: 02256	Decoder::decode_literal
14	3	h2::fuzz_bridge::fuzz_logic::fuzz_hpack	call site: 00003	Codec::with_max_recv_frame_size
13	1970	Decoder::decode_indexed	call site: 01970
12	2009	Decoder::try_decode_string	call site: 02009	Frame::map
10	2111	StatusCode::from_bytes	call site: 02111	Frame::map
9	2147	parse_hdr	call site: 02147	Store::try_for_each
9	2276	Table::set_max_size	call site: 02276	Deque::push_back

Runtime coverage analysis

Covered functions

207

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	12
h2/tests/h2-supportmock.rs	106
h2client.rs	13
h2codec/mod.rs	13
h2/tests/h2-tests/tests/server.rs	56
h2/tests/h2-tests/tests/stream_states.rs	71
httpconvert.rs	6
h2/tests/h2-tests/tests/prioritization.rs	25
h2/tests/h2-supportassert.rs	5
h2/tests/h2-supportutil.rs	14
h2ext.rs	8
httpbyte_str.rs	2
httpheader/value.rs	6
h2/tests/h2-tests/tests/flow_control.rs	60
httprequest.rs	13
h2codec/framed_read.rs	7
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	37
h2hpack/decoder.rs	35
h2proto/streams/store.rs	12
h2frame/headers.rs	7
httpheader/map.rs	16
h2hpack/header.rs	17
h2server.rs	19
h2proto/connection.rs	9
h2proto/settings.rs	3
h2/tests/h2-supportclient_ext.rs	7
h2proto/streams/streams.rs	6
h2/tests/h2-supportfuture_ext.rs	13
h2share.rs	12
h2/tests/h2-fuzzmain.rs	31
h2/tests/h2-tests/tests/client_request.rs	25
httpuri/builder.rs	2
h2lib.rs	1
h2hpack/encoder.rs	18
h2proto/streams/prioritize.rs	3
h2frame/settings.rs	2
h2proto/streams/flow_control.rs	11
h2proto/streams/recv.rs	10
h2/tests/h2-tests/tests/ping_pong.rs	31
h2proto/ping_pong.rs	8
h2hpack/table.rs	2
httpextensions.rs	2
http/tests/status_code.rs	14
httpmethod.rs	4
httpheader/name.rs	22
httpuri/path.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	1876	95.2%
gold	[1:9]	5	0.25%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	88	4.46%
All colors	1969	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
310	659	PathAndQuery::empty	call site: 00659	single_stream_send_extra_large_body_multi_frames_one_buffer
308	1523	frame::Headers::new	call site: 01523	recv_invalid_push_promise_headers_is_stream_protocol_error
289	1232	Window::add	call site: 01232	recv_invalid_push_promise_headers_is_stream_protocol_error
173	470	Codec::framed_write	call site: 00470	srv_window_update_on_lower_stream_id
155	90	Request::builder	call site: 00090	srv_window_update_on_lower_stream_id
123	1033	C::o::n::n::e::c::t::i::o::n::::::::n::e::w::streams_config	call site: 01033	srv_window_update_on_lower_stream_id
88	275	calculate_headermap_size	call site: 00275	errors_if_recv_frame_exceeds_max_frame_size
80	1888	calc_max_continuation_frames	call site: 01888	rst_stream_max
65	1164	Settings::new	call site: 01164	srv_window_update_on_lower_stream_id
61	408	SendRequest::send_request	call site: 00408	srv_window_update_on_lower_stream_id
52	21	mock::new	call site: 00021	single_stream_send_extra_large_body_multi_frames_one_buffer
52	1835	Table::new	call site: 01835	Handle::assert_client_handshake

Runtime coverage analysis

Covered functions

1363

Functions that are reachable but not covered

22

Reachable functions

35

Percentage of reachable functions covered

37.14%

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_client.rs	12
h2/tests/h2-supportmock.rs	91
h2client.rs	13
h2codec/mod.rs	13
h2/tests/h2-tests/tests/server.rs	61
h2/tests/h2-tests/tests/stream_states.rs	71
httpconvert.rs	6
h2/tests/h2-tests/tests/prioritization.rs	25
h2/tests/h2-supportassert.rs	5
h2/tests/h2-supportutil.rs	14
h2ext.rs	7
httpbyte_str.rs	2
httpheader/value.rs	1
h2/tests/h2-tests/tests/flow_control.rs	60
httprequest.rs	13
h2codec/framed_read.rs	7
h2proto/error.rs	2
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	37
h2hpack/decoder.rs	8
h2proto/streams/store.rs	6
h2frame/headers.rs	7
httpheader/map.rs	15
h2hpack/header.rs	2
h2server.rs	19
h2proto/connection.rs	9
h2proto/settings.rs	3
h2/tests/h2-supportclient_ext.rs	7
h2proto/streams/streams.rs	6
h2/tests/h2-supportfuture_ext.rs	13
h2share.rs	12
h2/tests/h2-fuzzmain.rs	31
h2/tests/h2-tests/tests/client_request.rs	25
httpuri/builder.rs	2
h2lib.rs	1
h2hpack/encoder.rs	1
h2proto/streams/prioritize.rs	2
h2frame/settings.rs	2
h2proto/streams/flow_control.rs	11
h2proto/streams/recv.rs	10
h2/tests/h2-tests/tests/ping_pong.rs	31
h2proto/ping_pong.rs	8
h2hpack/table.rs	2

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	1799	92.2%
gold	[1:9]	7	0.35%
yellow	[10:29]	5	0.25%
greenyellow	[30:49]	1	0.05%
lawngreen	50+	139	7.12%
All colors	1951	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
187	1644	MockIo::poll_flush	call site: 01644	srv_window_update_on_lower_stream_id
172	797	position	call site: 00797	single_stream_send_extra_large_body_multi_frames_one_buffer
164	1242	FlowControl::unclaimed_capacity	call site: 01242	run
130	666	Result::map_err	call site: 00666	run
123	1033	C::o::n::n::e::c::t::i::o::n::::::::n::e::w::streams_config	call site: 01033	srv_window_update_on_lower_stream_id
110	471	Codec::set_max_send_frame_size	call site: 00471	srv_window_update_on_lower_stream_id
110	1411	Poll::map_err	call site: 01411	recv_invalid_push_promise_headers_is_stream_protocol_error
88	275	calculate_headermap_size	call site: 00275	errors_if_recv_frame_exceeds_max_frame_size
72	155	frame::Settings::ack	call site: 00155	srv_window_update_on_lower_stream_id
66	1523	frame::Headers::new	call site: 01523	recv_invalid_push_promise_headers_is_stream_protocol_error
65	1164	Settings::new	call site: 01164	srv_window_update_on_lower_stream_id
62	1888	calc_max_continuation_frames	call site: 01888	rst_stream_max

Runtime coverage analysis

Covered functions

2122

Functions that are reachable but not covered

19

Reachable functions

48

Percentage of reachable functions covered

60.42%

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	4
h2/tests/h2-supportmock.rs	91
h2client.rs	13
h2codec/mod.rs	13
h2/tests/h2-tests/tests/server.rs	56
h2/tests/h2-tests/tests/stream_states.rs	71
httpconvert.rs	6
h2/tests/h2-tests/tests/prioritization.rs	25
h2/tests/h2-supportassert.rs	5
h2/tests/h2-supportutil.rs	14
h2ext.rs	7
httpbyte_str.rs	2
httpheader/value.rs	1
h2/tests/h2-tests/tests/flow_control.rs	60
httprequest.rs	13
h2codec/framed_read.rs	7
h2proto/error.rs	2
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	37
h2hpack/decoder.rs	8
h2proto/streams/store.rs	6
h2frame/headers.rs	7
httpheader/map.rs	14
h2hpack/header.rs	2
h2server.rs	19
h2proto/connection.rs	9
h2proto/settings.rs	3
h2/tests/h2-supportclient_ext.rs	7
h2proto/streams/streams.rs	6
h2/tests/h2-supportfuture_ext.rs	13
h2share.rs	12
h2/tests/h2-fuzzmain.rs	31
h2/tests/h2-tests/tests/client_request.rs	25
httpuri/builder.rs	2
h2lib.rs	1
h2hpack/encoder.rs	1
h2proto/streams/prioritize.rs	2
h2frame/settings.rs	2
h2proto/streams/flow_control.rs	11
h2proto/streams/recv.rs	10
h2/tests/h2-tests/tests/ping_pong.rs	31
h2proto/ping_pong.rs	8
h2hpack/table.rs	2

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 / 1923

Cyclomatic complexity statically reachable by fuzzers

29 / 4000

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=['PathAndQuery::empty', 'Prioritize::new', 'std::str::from_utf8', 'fuzz_target', 'Table::new', 'Recv::new', 'Request::builder', 'Pos::is_some', 'StatusCode::from_bytes', 'FramedWrite::new']

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', 'HeaderName::as_str', 'h2::frame::BytesStr::try_from', 'Encoder::new', 'Header::new', 'Name::into_entry', 'h2::fuzz_bridge::fuzz_logic::fuzz_hpack', 'Decoder::decode_indexed', 'Decoder::try_decode_string', 'StatusCode::from_bytes']

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=['PathAndQuery::empty', 'frame::Headers::new', 'Window::add', 'Codec::framed_write', 'Request::builder', 'C::o::n::n::e::c::t::i::o::n::::::::n::e::w::streams_config', 'calculate_headermap_size', 'calc_max_continuation_frames', 'Settings::new', 'SendRequest::send_request']

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=['MockIo::poll_flush', 'position', 'FlowControl::unclaimed_capacity', 'Result::map_err', 'C::o::n::n::e::c::t::i::o::n::::::::n::e::w::streams_config', 'Codec::set_max_send_frame_size', 'Poll::map_err', 'calculate_headermap_size', 'frame::Settings::ack', 'frame::Headers::new']

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	45	20	44.44%
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	12	31.57%

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

Directories in report

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

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