High level conclusions

Fuzzers reach 96.21% of cyclomatic complexity.

Fuzzers reach 92.11% of all functions.

Fuzzers reach 85.17% code coverage.

Reachability and coverage overview

Functions statically reachable by fuzzers

292 / 317

Cyclomatic complexity statically reachable by fuzzers

3021 / 3140

Runtime code coverage of functions

270 / 317

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	Fuzzers runtime hit	Func lines hit %	I Count	BB Count	Cyclomatic complexity	Functions reached	Reached by functions	Accumulated cyclomatic complexity	Undiscovered complexity

Fuzzer: magic_fuzzer_loaddb

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	147	30.6%
gold	[1:9]	1	0.20%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	331	69.1%
All colors	479	100

Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity	Unique Reachable Complexities	Unique Reachable Functions	All non-covered Complexity	All Reachable Complexity	Function Name	Function Callsite	Blocked Branch
188	188	1 : View List ['apprentice_list']	188	188	apprentice_1	call site: 00457	/src/file/src/apprentice.c:517
103	331	7 : View List ['__errno_location', 'fstat', 'maxoff_t', 'mmap', 'mprotect', 'file_error', 'check_buffer']	107	348	apprentice_map	call site: 00417	/src/file/src/apprentice.c:3293
57	57	1 : View List ['file_oomem']	59	72	apprentice_map	call site: 00414	/src/file/src/apprentice.c:3283
57	57	1 : View List ['file_oomem']	57	57	parse	call site: 00132	/src/file/src/apprentice.c:2063
57	57	1 : View List ['file_oomem']	57	57	parse	call site: 00133	/src/file/src/apprentice.c:2078
57	57	1 : View List ['file_oomem']	57	57	addentry	call site: 00359	/src/file/src/apprentice.c:1291
57	57	1 : View List ['file_oomem']	57	57	coalesce_entries	call site: 00391	/src/file/src/apprentice.c:1477
57	57	1 : View List ['file_oomem']	57	57	file_check_mem	call site: 00121	/src/file/src/funcs.c:627
22	22	2 : View List ['get_default_magic', 'getenv']	22	22	magic_getpath	call site: 00057	/src/file/src/magic.c:256
4	4	1 : View List ['__errno_location']	4	61	load_1	call site: 00112	/src/file/src/apprentice.c:1321
4	4	2 : View List ['close', 'abort']	4	4	fuzzer_get_tmpfile(unsignedcharconst*,unsignedlong)	call site: 00000	/src/fuzzer_temp_file.h:47
2	425	4 : View List ['getvalue', '__ctype_b_loc', 'check_format', 'file_mdump']	2	437	parse	call site: 00193	/src/file/src/apprentice.c:2346

Runtime coverage analysis

Covered functions

93

Functions that are reachable but not covered

79

Reachable functions

171

Percentage of reachable functions covered

53.8%

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
magic_fuzzer_loaddb.cc	1
fuzzer_temp_file.h	5
filemagic.c	7
fileapprentice.c	53
filefuncs.c	17
fileprint.c	7
filecdf_time.c	4
filestrlcpy.c	1
fileencoding.c	1
/usr/include/x86_64-linux-gnu/bits/byteswap.h	3

Fuzzer: magic_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color	Runtime hitcount	Callsite count	Percentage
red	0	471	44.1%
gold	[1:9]	10	0.93%
yellow	[10:29]	23	2.15%
greenyellow	[30:49]	12	1.12%
lawngreen	50+	550	51.5%
All colors	1066	100

Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity	Unique Reachable Complexities	Unique Reachable Functions	All non-covered Complexity	All Reachable Complexity	Function Name	Function Callsite	Blocked Branch
744	744	2 : View List ['apprentice_load', 'file_magwarn']	1031	1039	apprentice_1	call site: 00000	/src/file/src/apprentice.c:497
197	197	3 : View List ['cdf_file_catalog_info', 'cdf_app_to_mime', 'cdf_tole2']	197	197	cdf_check_summary_info	call site: 00333	/src/file/src/readcdf.c:405
188	188	1 : View List ['apprentice_list']	188	188	apprentice_1	call site: 00000	/src/file/src/apprentice.c:517
136	136	2 : View List ['file_mdump', 'mdebug']	138	2567	mget	call site: 00736	/src/file/src/softmagic.c:1808
103	103	1 : View List ['apprentice_compile']	835	835	apprentice_1	call site: 00000	/src/file/src/apprentice.c:488
79	79	1 : View List ['file_magic_strength']	79	79	magiccheck	call site: 00832	/src/file/src/softmagic.c:2471
61	71	4 : View List ['strlen', 'file_magerror', 'file_printable', 'regerror']	61	71	file_regcomp	call site: 00789	/src/file/src/funcs.c:741
57	64	2 : View List ['buffer_init', 'file_magerror']	57	64	msetoffset	call site: 00619	/src/file/src/softmagic.c:1528
57	57	1 : View List ['file_oomem']	72	72	apprentice_map	call site: 00000	/src/file/src/apprentice.c:3283
57	57	1 : View List ['file_oomem']	57	57	file_ascmagic_with_encoding	call site: 01013	/src/file/src/ascmagic.c:146
57	57	1 : View List ['file_oomem']	57	57	file_encoding	call site: 00047	/src/file/src/encoding.c:153
57	57	1 : View List ['file_oomem']	57	57	file_getbuffer	call site: 01062	/src/file/src/funcs.c:561

Runtime coverage analysis

Covered functions

192

Functions that are reachable but not covered

141

Reachable functions

314

Percentage of reachable functions covered

55.1%

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
magic_fuzzer.cc	1
filemagic.c	1
filefuncs.c	33
filebuffer.c	3
fileencoding.c	10
filecompress.c	21
fileis_tar.c	3
fileis_json.c	11
fileis_csv.c	3
fileis_simh.c	4
filereadcdf.c	9
filecdf.c	40
/usr/include/x86_64-linux-gnu/bits/byteswap.h	3
filecdf_time.c	5
filereadelf.c	9
filestrlcpy.c	1
filesoftmagic.c	29
fileapprentice.c	10
fileprint.c	7
fileder.c	6
filefmtcheck.c	4
fileascmagic.c	4

Fuzzer: magic_fuzzer_fd

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	438	38.2%
gold	[1:9]	23	2.00%
yellow	[10:29]	37	3.22%
greenyellow	[30:49]	16	1.39%
lawngreen	50+	632	55.1%
All colors	1146	100

Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity	Unique Reachable Complexities	Unique Reachable Functions	All non-covered Complexity	All Reachable Complexity	Function Name	Function Callsite	Blocked Branch
3269	3440	11 : View List ['__errno_location', 'magic_file', 'readlink', 'bad_link', 'strerror', 'gnu_dev_major', 'gnu_dev_minor', 'handle_mime', 'stat', 'lstat', 'file_error']	3269	3440	file_fsmagic	call site: 00051	/src/file/src/fsmagic.c:117
744	744	2 : View List ['apprentice_load', 'file_magwarn']	1031	1039	apprentice_1	call site: 00000	/src/file/src/apprentice.c:497
197	197	3 : View List ['cdf_file_catalog_info', 'cdf_app_to_mime', 'cdf_tole2']	197	197	cdf_check_summary_info	call site: 00407	/src/file/src/readcdf.c:405
188	188	1 : View List ['apprentice_list']	188	188	apprentice_1	call site: 00000	/src/file/src/apprentice.c:517
136	136	2 : View List ['file_mdump', 'mdebug']	138	2567	mget	call site: 00808	/src/file/src/softmagic.c:1808
109	109	1 : View List ['file_pipe2file']	111	3051	file_tryelf	call site: 00682	/src/file/src/readelf.c:1851
103	103	1 : View List ['apprentice_compile']	835	835	apprentice_1	call site: 00000	/src/file/src/apprentice.c:488
79	79	1 : View List ['file_magic_strength']	79	79	magiccheck	call site: 00903	/src/file/src/softmagic.c:2471
67	89	2 : View List ['unreadable_info', 'sread']	69	2738	file_or_fd	call site: 00051	/src/file/src/magic.c:496
61	71	4 : View List ['strlen', 'file_magerror', 'file_printable', 'regerror']	61	71	file_regcomp	call site: 00860	/src/file/src/funcs.c:741
57	57	1 : View List ['file_oomem']	72	72	apprentice_map	call site: 00000	/src/file/src/apprentice.c:3283
57	57	1 : View List ['file_oomem']	57	57	file_ascmagic_with_encoding	call site: 01083	/src/file/src/ascmagic.c:146

Runtime coverage analysis

Covered functions

221

Functions that are reachable but not covered

139

Reachable functions

346

Percentage of reachable functions covered

59.83%

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
magic_fuzzer_fd.cc	1
fuzzer_temp_file.h	5
filemagic.c	5
filefuncs.c	32
filefsmagic.c	3
filecompress.c	21
filebuffer.c	3
fileencoding.c	10
fileis_tar.c	3
fileis_json.c	11
fileis_csv.c	3
fileis_simh.c	4
filereadcdf.c	9
filecdf.c	40
/usr/include/x86_64-linux-gnu/bits/byteswap.h	3
filecdf_time.c	5
filereadelf.c	9
filestrlcpy.c	1
filesoftmagic.c	29
fileapprentice.c	10
fileprint.c	7
fileder.c	6
filefmtcheck.c	4
fileascmagic.c	4

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

292 / 317

Cyclomatic complexity statically reachable by fuzzers

3021 / 3140

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	Fuzzers runtime hit	Func lines hit %	I Count	BB Count	Cyclomatic complexity	Functions reached	Reached by functions	Accumulated cyclomatic complexity	Undiscovered complexity

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
apprentice_load	101	44	43.56%	['magic_fuzzer_loaddb']
check_buffer	52	28	53.84%	['magic_fuzzer_loaddb']
sread	52	27	51.92%	['magic_fuzzer', 'magic_fuzzer_fd']
get_next_format_from_precision	81	40	49.38%	['magic_fuzzer', 'magic_fuzzer_fd']
cdf_check_summary_info	38	12	31.57%	['magic_fuzzer', 'magic_fuzzer_fd']
file_fsmagic	183	11	6.010%	['magic_fuzzer_fd']
file_or_fd	82	42	51.21%	['magic_fuzzer_fd']

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/magic_fuzzer_loaddb.cc	['magic_fuzzer_loaddb']	['magic_fuzzer_loaddb']
/usr/include/x86_64-linux-gnu/bits/byteswap.h	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']	[]
/src/file/src/funcs.c	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/fmtcheck.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/cdf.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/strlcpy.c	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/is_csv.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/is_json.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/magic_fuzzer_fd.cc	['magic_fuzzer_fd']	['magic_fuzzer_fd']
/src/file/src/fsmagic.c	['magic_fuzzer_fd']	['magic_fuzzer_fd']
/src/file/src/print.c	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/der.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/ascmagic.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/apprentice.c	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/magic.c	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/compress.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/readcdf.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/is_simh.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/fuzzer_temp_file.h	['magic_fuzzer_loaddb', 'magic_fuzzer_fd']	['magic_fuzzer_loaddb', 'magic_fuzzer_fd']
/src/magic_fuzzer.cc	['magic_fuzzer']	['magic_fuzzer']
/src/file/src/softmagic.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/cdf_time.c	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/readelf.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer_fd']
/src/file/src/encoding.c	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer_loaddb', 'magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/buffer.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']
/src/file/src/is_tar.c	['magic_fuzzer', 'magic_fuzzer_fd']	['magic_fuzzer', 'magic_fuzzer_fd']

Directories in report

Directory
/src/file/src/
/src/
/usr/include/x86_64-linux-gnu/bits/