High level conclusions

Fuzzers reach 5.547% of cyclomatic complexity.

Fuzzers reach 2.888% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

26 / 900

Cyclomatic complexity statically reachable by fuzzers

323 / 5822

Runtime code coverage of functions

22 / 900

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_edp

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	42	43.2%
gold	[1:9]	2	2.06%
yellow	[10:29]	7	7.21%
greenyellow	[30:49]	4	4.12%
lawngreen	50+	42	43.2%
All colors	97	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
13	8	vlog	call site: 00008	translate
13	22	edp_decode	call site: 00022	log_warn
3	81	edp_decode	call site: 00081	lldpd_vlan_cleanup
2	73	lldpd_alloc_mgmt	call site: 00073	__errno_location
2	76	lldpd_alloc_mgmt	call site: 00076	log_warn
1	5	log_debug	call site: 00005	strcmp
1	36	edp_decode	call site: 00036	log_warn
1	49	edp_decode	call site: 00049	log_warn
1	58	edp_decode	call site: 00058	log_warn
1	60	edp_decode	call site: 00060	log_warn
1	62	edp_decode	call site: 00062	log_warn
1	64	edp_decode	call site: 00064	log_warn

Runtime coverage analysis

Covered functions

16

Functions that are reachable but not covered

21

Reachable functions

37

Percentage of reachable functions covered

43.24%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
tests/fuzz_edp.c	2
src/log.c	10
src/daemon/protocols/edp.c	1
src/daemon/lldpd.c	1
src/lldpd-structs.c	7

Fuzzer: fuzz_lldp

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	42	26.9%
gold	[1:9]	3	1.92%
yellow	[10:29]	13	8.33%
greenyellow	[30:49]	5	3.20%
lawngreen	50+	93	59.6%
All colors	156	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
13	8	vlog	call site: 00008	translate
5	22	lldp_decode	call site: 00022	log_warn
4	30	log_warn	call site: 00030	logit
4	58	lldp_decode	call site: 00058	log_warn
2	139	lldp_decode	call site: 00139	log_warn
1	5	log_debug	call site: 00005	strcmp
1	36	lldp_decode	call site: 00036	log_warn
1	66	lldp_decode	call site: 00066	log_warn
1	78	lldpd_alloc_mgmt	call site: 00078	__errno_location
1	81	lldpd_alloc_mgmt	call site: 00081	__errno_location
1	83	lldp_decode	call site: 00083	log_warn
1	89	lldp_decode	call site: 00089	log_warn

Runtime coverage analysis

Covered functions

18

Functions that are reachable but not covered

21

Reachable functions

39

Percentage of reachable functions covered

46.15%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
tests/fuzz_lldp.c	2
src/log.c	10
src/daemon/protocols/lldp.c	2
src/daemon/lldpd.c	1
src/lldpd-structs.c	7

Fuzzer: fuzz_sonmp

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	42	53.1%
gold	[1:9]	1	1.26%
yellow	[10:29]	5	6.32%
greenyellow	[30:49]	10	12.6%
lawngreen	50+	21	26.5%
All colors	79	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
13	8	vlog	call site: 00008	translate
13	22	sonmp_decode	call site: 00022	log_warn
4	55	lldpd_alloc_mgmt	call site: 00055	log_warn
2	52	lldpd_alloc_mgmt	call site: 00052	__errno_location
1	5	log_debug	call site: 00005	strcmp
1	36	sonmp_decode	call site: 00036	log_warn
1	43	sonmp_decode	call site: 00043	log_warn
1	45	sonmp_decode	call site: 00045	log_warnx
1	47	sonmp_decode	call site: 00047	log_warnx
1	49	sonmp_decode	call site: 00049	log_warnx
1	60	sonmp_decode	call site: 00060	log_warn
1	62	sonmp_decode	call site: 00062	log_warnx

Runtime coverage analysis

Covered functions

15

Functions that are reachable but not covered

22

Reachable functions

37

Percentage of reachable functions covered

40.54%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
tests/fuzz_sonmp.c	2
src/log.c	9
src/daemon/protocols/sonmp.c	1
src/daemon/lldpd.c	1
src/lldpd-structs.c	7

Fuzzer: fuzz_cdp

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	47	40.5%
gold	[1:9]	1	0.86%
yellow	[10:29]	6	5.17%
greenyellow	[30:49]	1	0.86%
lawngreen	50+	61	52.5%
All colors	116	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
13	11	vlog	call site: 00011	translate
5	25	cdp_decode	call site: 00025	log_warn
4	33	log_warn	call site: 00033	logit
4	70	lldpd_alloc_mgmt	call site: 00070	log_warn
4	78	cdp_decode	call site: 00078	log_warn
3	42	cdp_decode	call site: 00042	log_info
2	39	cdp_decode	call site: 00039	log_warn
2	56	cdp_decode	call site: 00056	log_warn
2	67	lldpd_alloc_mgmt	call site: 00067	__errno_location
1	8	log_debug	call site: 00008	strcmp
1	50	cdp_decode	call site: 00050	log_warnx
1	76	cdp_decode	call site: 00076	log_warn

Runtime coverage analysis

Covered functions

18

Functions that are reachable but not covered

23

Reachable functions

41

Percentage of reachable functions covered

43.9%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
tests/fuzz_cdp.c	2
src/log.c	10
src/daemon/protocols/cdp.c	3
src/daemon/lldpd.c	1
src/lldpd-structs.c	7

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
levent_loop	/src/lldpd/src/daemon/event.c	1	['N/A']	25	0	74	16	6	448	0	2386	2263
_lldp_send	/src/lldpd/src/daemon/protocols/lldp.c	10	['N/A', 'N/A', 'char', 'N/A', 'int', 'char', 'N/A', 'int', 'int', 'int']	5	0	6103	885	358	27	3	805	725
bufferevent_socket_connect_hostname	/src/lldpd/libevent/bufferevent_sock.c	5	['N/A', 'N/A', 'int', 'N/A', 'int']	19	0	109	16	7	148	0	729	251
fdp_send	/src/lldpd/src/daemon/protocols/cdp.c	2	['N/A', 'N/A']	6	0	18	3	2	28	0	238	148
priv_init	/src/lldpd/src/daemon/priv.c	4	['N/A', 'int', 'int', 'int']	7	0	130	19	20	66	0	240	118
edp_send	/src/lldpd/src/daemon/protocols/edp.c	2	['N/A', 'N/A']	4	0	1836	277	115	29	0	215	117
evutil_secure_rng_get_bytes	/src/lldpd/libevent/evutil_rand.c	2	['N/A', 'size_t']	9	0	18	3	2	24	0	114	100
bufferevent_filter_new	/src/lldpd/libevent/bufferevent_filter.c	6	['N/A', 'N/A', 'N/A', 'int', 'N/A', 'N/A']	19	0	175	19	8	130	0	625	96
event_reinit	/src/lldpd/libevent/event.c	1	['N/A']	8	0	327	49	17	93	0	445	95
evbuffer_readline	/src/lldpd/libevent/buffer.c	1	['N/A']	12	0	15	3	2	70	0	342	87

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

Functions statically reachable by fuzzers

504 / 900

Cyclomatic complexity statically reachable by fuzzers

3801 / 5822

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.

tests/fuzz_edp.c

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=['vlog', 'edp_decode', 'lldpd_alloc_mgmt', 'log_debug']

tests/fuzz_lldp.c

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=['vlog', 'lldp_decode', 'log_warn', 'log_debug', 'lldpd_alloc_mgmt']

tests/fuzz_sonmp.c

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=['vlog', 'sonmp_decode', 'lldpd_alloc_mgmt', 'log_debug']

tests/fuzz_cdp.c

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=['vlog', 'cdp_decode', 'log_warn', 'lldpd_alloc_mgmt', 'log_debug']

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

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/lldpd/src/daemon/bitmap.c	[]	[]
/src/lldpd/libevent/bufferevent_ratelim.c	[]	[]
/src/lldpd/libevent/./bufferevent-internal.h	[]	[]
/src/lldpd/libevent/evutil_time.c	[]	[]
/src/lldpd/libevent/bufferevent_filter.c	[]	[]
/src/lldpd/src/daemon/pattern.c	[]	[]
/src/lldpd/src/daemon/protocols/lldp.c	['fuzz_lldp']	['fuzz_lldp']
/src/lldpd/src/daemon/netlink.c	[]	[]
/src/lldpd/src/daemon/privsep.c	[]	[]
/src/lldpd/src/daemon/dmi-linux.c	[]	[]
/src/lldpd/libevent/event.c	[]	[]
/src/lldpd/src/daemon/event.c	[]	[]
/src/lldpd/src/daemon/privsep_fd.c	[]	[]
/src/lldpd/src/lldpd-structs.c	['fuzz_edp', 'fuzz_lldp', 'fuzz_sonmp', 'fuzz_cdp']	['fuzz_edp', 'fuzz_lldp', 'fuzz_sonmp', 'fuzz_cdp']
/src/lldpd/libevent/bufferevent_sock.c	[]	[]
/src/lldpd/src/daemon/interfaces.c	[]	[]
/src/lldpd/src/compat/strtonum.c	[]	[]
/src/lldpd/libevent/select.c	[]	[]
/src/lldpd/tests/fuzz_edp.c	['fuzz_edp']	['fuzz_edp']
/src/lldpd/src/daemon/privsep_io.c	[]	[]
/src/lldpd/tests/fuzz_cdp.c	['fuzz_cdp']	['fuzz_cdp']
/src/lldpd/src/marshal.c	[]	[]
/src/lldpd/libevent/././arc4random.c	[]	[]
/src/lldpd/src/version.c	[]	[]
/src/lldpd/src/ctl.c	[]	[]
/src/lldpd/src/daemon/protocols/cdp.c	['fuzz_cdp']	['fuzz_cdp']
/src/lldpd/libevent/evmap.c	[]	[]
/src/lldpd/src/daemon/lldpd.c	['fuzz_edp', 'fuzz_lldp', 'fuzz_sonmp', 'fuzz_cdp']	['fuzz_edp', 'fuzz_lldp', 'fuzz_sonmp', 'fuzz_cdp']
/src/lldpd/tests/fuzz_sonmp.c	['fuzz_sonmp']	['fuzz_sonmp']
/src/lldpd/libevent/signal.c	[]	[]
/src/lldpd/src/daemon/protocols/sonmp.c	['fuzz_sonmp']	['fuzz_sonmp']
/src/lldpd/src/daemon/client.c	[]	[]
/src/lldpd/libevent/evutil.c	[]	[]
/src/lldpd/libevent/poll.c	[]	[]
/src/lldpd/src/daemon/frame.c	[]	[]
/src/lldpd/src/compat/strlcpy.c	[]	[]
/src/lldpd/src/daemon/priv-linux.c	[]	[]
/src/lldpd/src/log.c	['fuzz_edp', 'fuzz_lldp', 'fuzz_sonmp', 'fuzz_cdp']	['fuzz_edp', 'fuzz_lldp', 'fuzz_sonmp', 'fuzz_cdp']
/src/lldpd/libevent/evutil_rand.c	[]	[]
/src/lldpd/tests/fuzz_lldp.c	['fuzz_lldp']	['fuzz_lldp']
/src/lldpd/src/daemon/protocols/edp.c	['fuzz_edp']	['fuzz_edp']
/src/lldpd/libevent/epoll.c	[]	[]
/src/lldpd/libevent/log.c	[]	[]
/src/lldpd/libevent/buffer.c	[]	[]
/src/lldpd/src/daemon/priv.c	[]	[]
/src/lldpd/libevent/bufferevent.c	[]	[]
/src/lldpd/src/daemon/forward-linux.c	[]	[]
/src/lldpd/libevent/./minheap-internal.h	[]	[]
/src/lldpd/libevent/strlcpy.c	[]	[]
/src/lldpd/src/./lldpd-structs.h	[]	[]
/src/lldpd/src/daemon/interfaces-linux.c	[]	[]
/src/lldpd/libevent/bufferevent_pair.c	[]	[]
/src/lldpd/src/compat/setproctitle.c	[]	[]

Directories in report

Directory
/src/lldpd/src/daemon/protocols/
/src/lldpd/libevent/
/src/lldpd/src/daemon/
/src/lldpd/libevent/./
/src/lldpd/src/compat/
/src/lldpd/tests/
/src/lldpd/src/
/src/lldpd/src/./
/src/lldpd/libevent/././