High level conclusions

Fuzzer test_blkid_fuzz is blocked:

The runtime code coverage of test_blkid_fuzz covers 23.91% of its statically reachable code. This means there is some place that blocks the fuzzer to continue exploring more code at run time.

Fuzzer test_last_fuzz is blocked:

The runtime code coverage of test_last_fuzz covers 22.05% of its statically reachable code. This means there is some place that blocks the fuzzer to continue exploring more code at run time.

Fuzzers reach 25.15% of cyclomatic complexity.

Fuzzers reach 22.17% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

434 / 1957

Cyclomatic complexity statically reachable by fuzzers

3555 / 14133

Runtime code coverage of functions

608 / 1957

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

Fuzzer: test_last_fuzz

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	66	39.5%
gold	[1:9]	2	1.19%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	99	59.2%
All colors	167	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
14	14	1 : View List ['dns_lookup']	20	199	list	call site: 00095	/src/util-linux/login-utils/last.c:521
8	8	2 : View List ['strncmp', 'strcmp']	40	333	list	call site: 00044	/src/util-linux/login-utils/last.c:418
4	4	2 : View List ['warn', 'gettext']	4	4	uread	call site: 00024	/src/util-linux/login-utils/last.c:218
4	4	2 : View List ['warn', 'gettext']	4	4	uread	call site: 00030	/src/util-linux/login-utils/last.c:255
4	4	2 : View List ['errx', 'gettext']	4	4	list	call site: 00077	/src/util-linux/login-utils/last.c:455
2	2	1 : View List ['err']	4	4	process_wtmp_file	call site: 00034	/src/util-linux/login-utils/last.c:716
2	2	1 : View List ['errx']	4	4	process_wtmp_file	call site: 00158	/src/util-linux/login-utils/last.c:922
2	2	1 : View List ['putchar']	2	2	list	call site: 00107	/src/util-linux/login-utils/last.c:571
0	0	None	32	2487	process_wtmp_file	call site: 00038	/src/util-linux/login-utils/last.c:736
0	0	None	32	2487	process_wtmp_file	call site: 00038	/src/util-linux/login-utils/last.c:739
0	0	None	32	2487	process_wtmp_file	call site: 00038	/src/util-linux/login-utils/last.c:744
0	0	None	32	2487	process_wtmp_file	call site: 00127	/src/util-linux/login-utils/last.c:791

Runtime coverage analysis

Covered functions

15

Functions that are reachable but not covered

53

Reachable functions

68

Percentage of reachable functions covered

22.06%

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
login-utils/last.c	8
lib/fileutils.c	1
./include/all-io.h	1
./include/c.h	1
./include/strutils.h	2
lib/timeutils.c	3
./include/carefulputc.h	1
./include/cctype.h	1
./include/xalloc.h	2

Fuzzer: test_fdisk_script_fuzz

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	190	26.7%
gold	[1:9]	7	0.98%
yellow	[10:29]	1	0.14%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	511	72.0%
All colors	709	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
273	273	1 : View List ['write_file_json']	273	273	fdisk_script_write_file	call site: 00464	/src/util-linux/libfdisk/src/script.c:749
15	15	3 : View List ['ul_debug.4945', 'blkid_get_library_version', 'getpid']	15	15	blkid_init_debug	call site: 00000	/src/util-linux/libblkid/src/init.c:55
2	2	1 : View List ['close']	4	132	reset_context	call site: 00683	/src/util-linux/libfdisk/src/context.c:538
0	20	1 : View List ['fdisk_script_free_header']	0	20	fdisk_script_set_header	call site: 00185	/src/util-linux/libfdisk/src/script.c:320
0	0	None	79	213	parse_line_header	call site: 00087	/src/util-linux/libfdisk/src/script.c:777
0	0	None	77	211	parse_line_header	call site: 00088	/src/util-linux/libfdisk/src/script.c:782
0	0	None	58	1023	parse_line_nameval	call site: 00202	/src/util-linux/libfdisk/src/script.c:1141
0	0	None	42	106	fdisk_script_set_header	call site: 00167	/src/util-linux/libfdisk/src/script.c:291
0	0	None	32	643	fdisk_script_read_line	call site: 00052	/src/util-linux/libfdisk/src/script.c:1406
0	0	None	30	68	fdisk_script_set_header	call site: 00168	/src/util-linux/libfdisk/src/script.c:298
0	0	None	24	812	parse_line_valcommas	call site: 00435	/src/util-linux/libfdisk/src/script.c:1250
0	0	None	22	39	parttype_from_data	call site: 00336	/src/util-linux/libfdisk/src/parttype.c:336

Runtime coverage analysis

Covered functions

105

Functions that are reachable but not covered

75

Reachable functions

176

Percentage of reachable functions covered

57.39%

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.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
libfdisk/src/script.c	28
lib/fileutils.c	1
./include/all-io.h	1
./include/c.h	1
libfdisk/src/context.c	6
./include/debugobj.h	1
libfdisk/src/gpt.c	1
libfdisk/src/dos.c	1
libfdisk/src/bsd.c	1
libfdisk/src/sgi.c	1
libfdisk/src/sun.c	1
./include/strutils.h	5
libfdisk/src/table.c	8
./include/list.h	5
lib/strutils.c	4
libfdisk/src/ask.c	11
libfdisk/src/partition.c	22
./include/debug.h	1
./include/mangle.h	1
lib/mangle.c	1
libfdisk/src/parttype.c	15
lib/jsonwrt.c	10
./include/cctype.h	2
libfdisk/src/iter.c	1
libfdisk/src/utils.c	1
lib/canonicalize.c	2
libfdisk/src/label.c	2
./include/carefulputc.h	1
libfdisk/src/alignment.c	1
libfdisk/src/wipe.c	1

Fuzzer: test_blkid_fuzz

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	327	76.7%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	99	23.2%
All colors	426	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
550	564	24 : View List ['blkid_parttable_set_id', 'blkid_probe_get_sectorsize', 'blkid_partition_gen_uuid', 'dos_partition_get_size.5396', 'getpid', 'blkid_partlist_increment_partno', 'is_extended', 'blkid_partition_set_flags', 'blkid_partitions_do_subprobe', 'blkid_partition_is_extended', 'blkid_probe_is_tiny', 'ul_debug.5392', 'parse_dos_extended', 'blkid_partition_is_logical', 'dos_partition_get_start.5395', 'blkid_partition_get_type', 'blkid_partlist_set_partno', 'blkid_partition_set_type', 'blkid_partlist_numof_partitions', 'blkid_partlist_new_parttable', 'blkid_partition_get_size', 'blkid_partlist_add_partition', 'blkid_probe_get_partlist', 'blkid_partlist_get_partition']	550	564	probe_dos_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/dos.c:253
310	312	7 : View List ['blkid_partlist_new_parttable', 'parse_extended', 'memcmp', 'blkid_probe_get_partlist', 'is_id_common', 'parse_partition', 'blkid_partlist_increment_partno']	310	312	probe_atari_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/atari.c:253
126	244	2 : View List ['blkid_probe_get_buffer', 'sb_log_offset']	130	690	probe_btrfs	call site: 00000	/src/util-linux/libblkid/src/superblocks/btrfs.c:255
85	187	11 : View List ['__errno_location', '__bswap_32.5498', 'getpid', 'blkid_partlist_new_parttable', 'get_mac_block', 'blkid_partition_set_name', 'blkid_partlist_add_partition', 'blkid_partition_set_type_string', 'blkid_probe_get_partlist', 'has_part_signature', 'ul_debug.5497']	85	187	probe_mac_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/mac.c:113
84	232	17 : View List ['blkid_probe_verify_csum', '__errno_location', 'ul_debug.5341', 'getpid', 'blkid_partlist_get_parent', 'blkid_probe_get_partlist', 'bsd_checksum', 'blkid_partition_get_type', 'blkid_partition_set_type', 'blkid_partlist_new_parttable', 'blkid_partition_get_size', 'blkid_probe_get_sector', 'blkid_partlist_add_partition', '__uint16_identity.5342', '__uint32_identity.5340', 'blkid_is_nested_dimension', 'blkid_partition_get_start']	84	232	probe_bsd_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/bsd.c:54
52	54	10 : View List ['ul_debug.4188', 'blkid_partition_set_type', 'getpid', 'blkid_partlist_increment_partno', '__bswap_32.4186', 'blkid_partlist_new_parttable', 'blkid_partition_set_flags', 'blkid_partlist_add_partition', 'blkid_probe_get_partlist', '__bswap_16.4187']	52	54	probe_sun_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/sun.c:42
48	50	6 : View List ['blkid_partlist_add_partition', 'blkid_partition_set_type', '__bswap_32.4137', 'blkid_partlist_increment_partno', 'blkid_probe_get_partlist', 'blkid_partlist_new_parttable']	48	50	probe_sgi_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/sgi.c:40
46	48	4 : View List ['blkid_probe_get_partlist', 'blkid_partlist_increment_partno', 'blkid_partlist_add_partition', 'blkid_partlist_new_parttable']	46	48	probe_ultrix_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/ultrix.c:63
37	37	1 : View List ['partitions_init_data']	854	1090	partitions_probe	call site: 00000	/src/util-linux/libblkid/src/partitions/partitions.c:598
30	58	3 : View List ['blkid_probe_get_partlist', 'reset_partlist', 'blkid_probe_chain_reset_values']	34	114	idinfo_probe	call site: 00000	/src/util-linux/libblkid/src/partitions/partitions.c:561
20	22	2 : View List ['blkid_probe_get_partlist', 'blkid_partlist_new_parttable']	20	22	probe_aix_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/aix.c:23
15	15	3 : View List ['ul_debug.4945', 'blkid_get_library_version', 'getpid']	15	15	blkid_init_debug	call site: 00000	/src/util-linux/libblkid/src/init.c:55

Runtime coverage analysis

Covered functions

262

Functions that are reachable but not covered

105

Reachable functions

138

Percentage of reachable functions covered

23.91%

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
libblkid/src/fuzz.c	2
libblkid/src/probe.c	26
./include/debug.h	1
./include/list.h	5
lib/blkdev.c	3
./include/all-io.h	1
./include/c.h	2
lib/sysfs.c	15
lib/path.c	19
./include/debugobj.h	1
./include/sysfs.h	2
lib/fileutils.c	3
libblkid/src/devno.c	1
./include/fileutils.h	1
./include/strutils.h	2
libblkid/src/tag.c	1
libblkid/src/partitions/partitions.c	2
libblkid/src/superblocks/superblocks.c	2

Fuzzer: test_mount_fuzz

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	673	40.7%
gold	[1:9]	241	14.5%
yellow	[10:29]	64	3.87%
greenyellow	[30:49]	150	9.07%
lawngreen	50+	525	31.7%
All colors	1653	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
837	951	29 : View List ['blkid_parttable_set_id', 'blkid_probe_get_sectorsize', 'blkid_partition_gen_uuid', 'dos_partition_get_size.5396', 'blkid_partlist_increment_partno', 'blkid_partitions_need_typeonly', 'is_extended', 'blkid_partition_set_flags', 'blkid_probe_use_wiper', 'blkid_partitions_do_subprobe', 'blkid_partition_is_extended', 'blkid_probe_is_tiny', 'mbr_get_id.5399', 'parse_dos_extended', 'blkid_partitions_strcpy_ptuuid', 'blkid_partition_is_logical', 'dos_partition_get_start.5395', 'is_empty_mbr', 'blkid_partition_get_type', 'blkid_partlist_set_partno', 'blkid_partition_set_type', 'blkid_partlist_numof_partitions', 'blkid_partlist_new_parttable', 'blkid_probe_is_ntfs', 'blkid_partition_get_size', 'blkid_partlist_add_partition', 'blkid_probe_get_partlist', 'blkid_partlist_get_partition', 'is_lvm']	843	957	probe_dos_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/dos.c:223
310	394	12 : View List ['blkid_probe_set_magic', 'memcmp', 'blkid_partitions_need_typeonly', 'is_id_common', 'blkid_partlist_increment_partno', 'parse_partition', 'blkid_partlist_new_parttable', 'parse_extended', 'is_valid_partition', '__bswap_32.5321', 'is_valid_dimension', 'blkid_probe_get_partlist']	310	394	probe_atari_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/atari.c:226
195	195	1 : View List ['sync_opts_from_optlist']	195	379	mnt_fs_strdup_options	call site: 00314	/src/util-linux/libmount/src/fs.c:900
192	352	7 : View List ['blkid_probe_set_magic', 'blkid_probe_set_label', 'raid1_verify_csum', '__uint64_identity.6223', '__uint32_identity.6222', 'blkid_probe_set_uuid_as', 'blkid_probe_set_uuid']	192	352	probe_raid1	call site: 00000	/src/util-linux/libblkid/src/superblocks/linux_raid.c:220
167	167	1 : View List ['mnt_optlist_set_optstr']	167	167	mnt_fs_set_options	call site: 00145	/src/util-linux/libmount/src/fs.c:963
94	108	3 : View List ['blkid_probe_get_hint', 'cdrom_size_correction', 'blkid_probe_set_hint']	102	476	blkid_probe_set_device	call site: 01138	/src/util-linux/libblkid/src/probe.c:1213
90	583	6 : View List ['__bswap_32.6224', 'blkid_probe_set_magic', 'blkid_probe_is_covered_by_pt', 'blkid_probe_sprintf_version', 'blkid_probe_is_wholedisk', 'blkid_probe_set_uuid']	90	583	probe_raid0	call site: 00000	/src/util-linux/libblkid/src/superblocks/linux_raid.c:135
59	984	11 : View List ['free', 'ul_debug.5085', 'readdir', 'opendir', 'getpid', 'closedir', 'lvm_get_devno', 'probe_one', 'malloc', 'strlen', 'strcmp']	59	984	lvm_probe_all	call site: 01337	/src/util-linux/libblkid/src/devname.c:302
55	55	1 : View List ['blkid_probe_set_label']	55	389	ext_get_info	call site: 00000	/src/util-linux/libblkid/src/superblocks/ext.c:204
55	55	1 : View List ['blkid_probe_set_label']	55	259	probe_vfat	call site: 00000	/src/util-linux/libblkid/src/superblocks/vfat.c:426
43	43	1 : View List ['blkid_partitions_set_ptuuid']	43	43	probe_gpt_pt	call site: 00000	/src/util-linux/libblkid/src/partitions/gpt.c:348
38	38	4 : View List ['fstat', 'ioctl', '__errno_location', 'blkdev_find_size']	38	38	blkdev_get_size	call site: 01001	/src/util-linux/lib/blkdev.c:103

Runtime coverage analysis

Covered functions

363

Functions that are reachable but not covered

166

Reachable functions

390

Percentage of reachable functions covered

57.44%

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
libmount/src/fuzz.c	1
libmount/src/tab.c	12
./include/debugobj.h	1
./include/c.h	3
libmount/src/tab_parse.c	19
libmount/src/fs.c	22
./include/strutils.h	5
lib/strutils.c	5
./include/debug.h	1
lib/mangle.c	3
libblkid/src/tag.c	10
libmount/src/utils.c	6
libmount/src/optlist.c	16
./include/list.h	7
libmount/src/optmap.c	2
libmount/src/optstr.c	8
lib/buffer.c	7
lib/mbsalign.c	2
libmount/src/iter.c	1
libmount/src/fs_statmount.c	3
libmount/src/cache.c	10
lib/canonicalize.c	4
lib/sysfs.c	19
lib/path.c	26
./include/sysfs.h	2
libblkid/src/evaluate.c	4
libblkid/src/config.c	4
lib/env.c	1
libblkid/src/encode.c	7
./include/closestream.h	1
libblkid/src/cache.c	4
libblkid/src/read.c	10
libblkid/src/devname.c	10
libblkid/src/dev.c	2
libblkid/src/verify.c	2
./include/all-io.h	1
libblkid/src/probe.c	30
lib/blkdev.c	3
lib/fileutils.c	4
libblkid/src/devno.c	7
./include/fileutils.h	1
libblkid/src/superblocks/superblocks.c	3
libblkid/src/partitions/partitions.c	2
libblkid/src/resolve.c	1
libblkid/src/save.c	3
libmount/src/tab_listmount.c	1

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
probe_dos_pt	/src/util-linux/libblkid/src/partitions/dos.c	2	['N/A', 'N/A']	9	0	668	127	43	134	0	706	580
dos_add_partition	/src/util-linux/libfdisk/src/dos.c	3	['N/A', 'N/A', 'N/A']	10	0	1410	279	91	110	0	631	488
mnt_table_is_fs_mounted	/src/util-linux/libmount/src/tab.c	2	['N/A', 'N/A']	24	0	20	3	2	363	0	2382	482
fdisk_set_partition	/src/util-linux/libfdisk/src/partition.c	3	['N/A', 'size_t', 'N/A']	9	0	315	53	20	87	0	548	349
fdisk_apply_script	/src/util-linux/libfdisk/src/script.c	2	['N/A', 'N/A']	15	0	126	24	6	249	0	1220	314
gpt_add_partition	/src/util-linux/libfdisk/src/gpt.c	3	['N/A', 'N/A', 'N/A']	9	0	1270	217	66	129	0	587	234
probe_befs	/src/util-linux/libblkid/src/superblocks/befs.c	2	['N/A', 'N/A']	9	0	362	61	24	58	0	345	189

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

Functions statically reachable by fuzzers

767 / 1957

Cyclomatic complexity statically reachable by fuzzers

6165 / 14133

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 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.

login-utils/last.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=['rtrim_whitespace', 'list', 'process_wtmp_file', 'write_all', 'fputs_careful', 'uread']

libfdisk/src/script.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=['fdisk_script_write_file', 'ul_strtou64', 'fdisk_parttype_get_code', 'fdisk_partname', '__canonicalize_dm_name', 'script_get_header', 'fdisk_parttype_get_string', 'fdisk_deinit_label', 'fdisk_free_wipe_areas', 'write_all']

libblkid/src/fuzz.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=['blkid_probe_is_wholedisk', 'blkid_probe_set_device', 'get_hint', 'blkid_probe_reset_hints', 'list_add_tail', 'blkid_new_probe', 'blkid_probe_reset_buffers']

libmount/src/fuzz.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=['mnt_parse_mountinfo_line', 'lvm_probe_all', 'blkdev_get_size', 'blkid_read_config', 'is_dm_devname', 'probe_one', 'next_u64', 'get_hint', 'ul_path_read', 'blkid_probe_set_device']

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
probe_atari_pt	81	40	49.38%	[]
probe_bsd_pt	93	13	13.97%	[]
probe_dos_pt	113	44	38.93%	[]
probe_mac_pt	77	27	35.06%	[]
probe_minix_pt	52	14	26.92%	[]
probe_sgi_pt	45	20	44.44%	[]
probe_solaris_pt	58	23	39.65%	[]
probe_sun_pt	65	22	33.84%	[]
probe_ultrix_pt	43	21	48.83%	[]
read_buffer	40	21	52.5%	[]
blkdev_get_size	37	4	10.81%	['test_blkid_fuzz', 'test_mount_fuzz']
blkid_get_dev	80	42	52.5%	['test_mount_fuzz']
lvm_probe_all	53	7	13.20%	['test_mount_fuzz']
evaluate_by_udev	39	18	46.15%	['test_mount_fuzz']
blkid_partlist_devno_to_partition	59	26	44.06%	[]
blkid_flush_cache	108	53	49.07%	['test_mount_fuzz']
probe_ddf	43	18	41.86%	[]
probe_raid0	61	18	29.50%	[]
probe_pdcraid	31	8	25.80%	[]
probe_zfs	37	20	54.05%	[]

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/util-linux/lib/crc32c.c	[]	[]
/src/util-linux/libblkid/src/topology/topology.c	[]	[]
/src/util-linux/libblkid/src/superblocks/jfs.c	[]	[]
/src/util-linux/libblkid/src/dev.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libmount/src/optstr.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/./include/canonicalize.h	[]	[]
/src/util-linux/lib/mangle.c	['test_fdisk_script_fuzz', 'test_mount_fuzz']	['test_fdisk_script_fuzz', 'test_mount_fuzz']
/src/util-linux/libblkid/src/partitions/bsd.c	[]	[]
/src/util-linux/libblkid/src/topology/evms.c	[]	[]
/src/util-linux/libmount/src/version.c	[]	[]
/src/util-linux/libmount/src/fs.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/highpoint_raid.c	[]	[]
/src/util-linux/./include/closestream.h	['test_mount_fuzz']	[]
/src/util-linux/libuuid/src/parse.c	[]	[]
/src/util-linux/libblkid/src/superblocks/drbd.c	[]	[]
/src/util-linux/./include/pt-mbr.h	[]	[]
/src/util-linux/libblkid/src/superblocks/erofs.c	[]	[]
/src/util-linux/libblkid/src/superblocks/isw_raid.c	[]	[]
/src/util-linux/libblkid/src/superblocks/bcache.c	[]	[]
/src/util-linux/libfdisk/src/gpt.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/libblkid/src/superblocks/superblocks.c	['test_blkid_fuzz', 'test_mount_fuzz']	['test_blkid_fuzz', 'test_mount_fuzz']
/src/util-linux/lib/linux_version.c	[]	[]
/src/util-linux/libmount/src/optmap.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/cramfs.c	[]	[]
/src/util-linux/libblkid/src/superblocks/linux_raid.c	[]	[]
/src/util-linux/libblkid/src/config.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/partitions/sun.c	[]	[]
/src/util-linux/libblkid/src/partitions/mac.c	[]	[]
/src/util-linux/libmount/src/cache.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/probe.c	['test_blkid_fuzz', 'test_mount_fuzz']	['test_blkid_fuzz', 'test_mount_fuzz']
/src/util-linux/lib/blkdev.c	['test_blkid_fuzz', 'test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/ufs.c	[]	[]
/src/util-linux/libblkid/src/superblocks/ddf_raid.c	[]	[]
/src/util-linux/libblkid/src/resolve.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/zonefs.c	[]	[]
/src/util-linux/libblkid/src/devname.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/ocfs.c	[]	[]
/src/util-linux/libmount/src/fs_statmount.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/cache.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/hfs.c	[]	[]
/src/util-linux/libblkid/src/topology/md.c	[]	[]
/src/util-linux/libblkid/src/superblocks/mpool.c	[]	[]
/src/util-linux/libblkid/src/evaluate.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/init.c	[]	[]
/src/util-linux/libblkid/src/superblocks/bitlocker.c	[]	[]
/src/util-linux/libblkid/src/superblocks/cs_fvault2.c	[]	[]
/src/util-linux/lib/match.c	[]	[]
/src/util-linux/lib/randutils.c	[]	[]
/src/util-linux/libblkid/src/superblocks/iso9660.c	[]	[]
/src/util-linux/libmount/src/optlist.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/./include/pt-sun.h	[]	[]
/src/util-linux/lib/sysfs.c	['test_blkid_fuzz', 'test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libmount/src/utils.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/lib/timeutils.c	['test_last_fuzz']	[]
/src/util-linux/libblkid/src/partitions/solaris_x86.c	[]	[]
/src/util-linux/./include/xxhash.h	[]	[]
/src/util-linux/./include/mangle.h	['test_fdisk_script_fuzz']	[]
/src/util-linux/libuuid/src/pack.c	[]	[]
/src/util-linux/lib/loopdev.c	[]	[]
/src/util-linux/libblkid/src/superblocks/udf.c	[]	[]
/src/util-linux/libblkid/src/superblocks/nilfs.c	[]	[]
/src/util-linux/./include/partx.h	[]	[]
/src/util-linux/libblkid/src/superblocks/swap.c	[]	[]
/src/util-linux/libblkid/src/superblocks/adaptec_raid.c	[]	[]
/src/util-linux/libmount/src/init.c	[]	[]
/src/util-linux/lib/fileutils.c	['test_last_fuzz', 'test_fdisk_script_fuzz', 'test_blkid_fuzz', 'test_mount_fuzz']	['test_last_fuzz', 'test_fdisk_script_fuzz', 'test_mount_fuzz']
/src/util-linux/libblkid/src/partitions/dos.c	[]	[]
/src/util-linux/libblkid/src/superblocks/stratis.c	[]	[]
/src/util-linux/libblkid/src/superblocks/hpfs.c	[]	[]
/src/util-linux/libblkid/src/encode.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/ntfs.c	[]	[]
/src/util-linux/libblkid/src/superblocks/vfat.c	[]	[]
/src/util-linux/libmount/src/tab.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/reiserfs.c	[]	[]
/src/util-linux/libmount/src/btrfs.c	[]	[]
/src/util-linux/./include/sysfs.h	['test_blkid_fuzz', 'test_mount_fuzz']	[]
/src/util-linux/libblkid/src/partitions/sgi.c	[]	[]
/src/util-linux/libuuid/src/gen_uuid.c	[]	[]
/src/util-linux/libblkid/src/superblocks/apfs.c	[]	[]
/src/util-linux/libblkid/src/partitions/minix.c	[]	[]
/src/util-linux/./include/debug.h	['test_fdisk_script_fuzz', 'test_blkid_fuzz', 'test_mount_fuzz']	[]
/src/util-linux/libfdisk/src/script.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/libfdisk/src/item.c	[]	[]
/src/util-linux/libblkid/src/superblocks/bluestore.c	[]	[]
/src/util-linux/libfdisk/src/sgi.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/libblkid/src/fuzz.c	['test_blkid_fuzz']	['test_blkid_fuzz']
/src/util-linux/lib/md5.c	[]	[]
/src/util-linux/libblkid/src/topology/ioctl.c	[]	[]
/src/util-linux/libfdisk/src/label.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/libblkid/src/superblocks/via_raid.c	[]	[]
/src/util-linux/libblkid/src/save.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/./include/all-io.h	['test_last_fuzz', 'test_fdisk_script_fuzz', 'test_blkid_fuzz', 'test_mount_fuzz']	[]
/src/util-linux/libblkid/src/superblocks/squashfs.c	[]	[]
/src/util-linux/libblkid/src/superblocks/superblocks.h	[]	[]
/src/util-linux/libblkid/src/superblocks/silicon_raid.c	[]	[]
/src/util-linux/lib/crc32.c	[]	[]
/src/util-linux/libblkid/src/partitions/ultrix.c	[]	[]
/src/util-linux/lib/cpuset.c	[]	[]
/src/util-linux/libblkid/src/partitions/aix.c	[]	[]
/src/util-linux/libblkid/src/superblocks/luks.c	[]	[]
/src/util-linux/libblkid/src/superblocks/drbdmanage.c	[]	[]
/src/util-linux/lib/sha1.c	[]	[]
/src/util-linux/libblkid/src/superblocks/minix.c	[]	[]
/src/util-linux/libblkid/src/tag.c	['test_blkid_fuzz', 'test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libfdisk/src/version.c	[]	[]
/src/util-linux/libblkid/src/superblocks/lvm.c	[]	[]
/src/util-linux/libfdisk/src/parttype.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/./include/fileutils.h	['test_blkid_fuzz', 'test_mount_fuzz']	[]
/src/util-linux/libfdisk/src/sun.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/libblkid/src/superblocks/romfs.c	[]	[]
/src/util-linux/libblkid/src/partitions/unixware.c	[]	[]
/src/util-linux/libblkid/src/superblocks/vdo.c	[]	[]
/src/util-linux/libblkid/src/superblocks/btrfs.c	[]	[]
/src/util-linux/libfdisk/src/init.c	[]	[]
/src/util-linux/lib/canonicalize.c	['test_fdisk_script_fuzz', 'test_mount_fuzz']	['test_fdisk_script_fuzz', 'test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/netware.c	[]	[]
/src/util-linux/lib/sha256.c	[]	[]
/src/util-linux/lib/encode.c	[]	[]
/src/util-linux/lib/path.c	['test_blkid_fuzz', 'test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/befs.c	[]	[]
/src/util-linux/libfdisk/src/wipe.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/./include/list.h	['test_fdisk_script_fuzz', 'test_blkid_fuzz', 'test_mount_fuzz']	[]
/src/util-linux/lib/crc64.c	[]	[]
/src/util-linux/lib/jsonwrt.c	['test_fdisk_script_fuzz']	[]
/src/util-linux/lib/strutils.c	['test_fdisk_script_fuzz', 'test_mount_fuzz']	['test_fdisk_script_fuzz', 'test_mount_fuzz']
/src/util-linux/libfdisk/src/bsd.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/./include/carefulputc.h	['test_last_fuzz', 'test_fdisk_script_fuzz']	[]
/src/util-linux/./include/xalloc.h	['test_last_fuzz']	[]
/src/util-linux/libblkid/src/superblocks/promise_raid.c	[]	[]
/src/util-linux/libblkid/src/topology/lvm.c	[]	[]
/src/util-linux/./include/c.h	['test_last_fuzz', 'test_fdisk_script_fuzz', 'test_blkid_fuzz', 'test_mount_fuzz']	[]
/src/util-linux/./include/debugobj.h	['test_fdisk_script_fuzz', 'test_blkid_fuzz', 'test_mount_fuzz']	[]
/src/util-linux/libfdisk/src/ask.c	['test_fdisk_script_fuzz']	[]
/src/util-linux/libmount/src/iter.c	['test_mount_fuzz']	[]
/src/util-linux/libblkid/src/topology/dm.c	[]	[]
/src/util-linux/login-utils/last.c	['test_last_fuzz']	['test_last_fuzz']
/src/util-linux/libfdisk/src/dos.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/libblkid/src/superblocks/vmfs.c	[]	[]
/usr/include/x86_64-linux-gnu/bits/uintn-identity.h	[]	[]
/src/util-linux/libblkid/src/partitions/partitions.c	['test_blkid_fuzz', 'test_mount_fuzz']	['test_blkid_fuzz', 'test_mount_fuzz']
/src/util-linux/libblkid/src/read.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/xfs.c	[]	[]
/src/util-linux/lib/strv.c	[]	[]
/src/util-linux/libblkid/src/superblocks/zfs.c	[]	[]
/src/util-linux/libblkid/src/superblocks/lsi_raid.c	[]	[]
/src/util-linux/libfdisk/src/iter.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/./include/pt-sgi.h	[]	[]
/src/util-linux/libblkid/src/superblocks/exfat.c	[]	[]
/src/util-linux/libblkid/src/partitions/gpt.c	[]	[]
/src/util-linux/libblkid/src/superblocks/nvidia_raid.c	[]	[]
/src/util-linux/./include/iso9660.h	[]	[]
/src/util-linux/libblkid/src/superblocks/drbdproxy_datalog.c	[]	[]
/src/util-linux/libuuid/src/unparse.c	[]	[]
/src/util-linux/libfdisk/src/partition.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/libmount/src/fuzz.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/jmicron_raid.c	[]	[]
/src/util-linux/libfdisk/src/table.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/lib/mbsalign.c	['test_mount_fuzz']	[]
/src/util-linux/libblkid/src/superblocks/exfs.c	[]	[]
/src/util-linux/libblkid/src/partitions/atari.c	[]	[]
/src/util-linux/libmount/src/tab_listmount.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/superblocks/vxfs.c	[]	[]
/src/util-linux/libblkid/src/devno.c	['test_blkid_fuzz', 'test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libfdisk/src/alignment.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/lib/env.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libblkid/src/verify.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/./include/env.h	[]	[]
/src/util-linux/libfdisk/src/context.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/libblkid/src/superblocks/ubi.c	[]	[]
/src/util-linux/./include/strutils.h	['test_last_fuzz', 'test_fdisk_script_fuzz', 'test_blkid_fuzz', 'test_mount_fuzz']	[]
/src/util-linux/./include/cctype.h	['test_last_fuzz', 'test_fdisk_script_fuzz']	[]
/src/util-linux/lib/buffer.c	['test_mount_fuzz']	['test_mount_fuzz']
/src/util-linux/libuuid/src/unpack.c	[]	[]
/src/util-linux/libblkid/src/superblocks/f2fs.c	[]	[]
/src/util-linux/libblkid/src/superblocks/sysv.c	[]	[]
/src/util-linux/libblkid/src/superblocks/ubifs.c	[]	[]
/src/util-linux/libblkid/src/topology/sysfs.c	[]	[]
/src/util-linux/libblkid/src/superblocks/ext.c	[]	[]
/src/util-linux/libfdisk/src/utils.c	['test_fdisk_script_fuzz']	['test_fdisk_script_fuzz']
/src/util-linux/libblkid/src/superblocks/gfs.c	[]	[]
/usr/include/x86_64-linux-gnu/bits/byteswap.h	[]	[]
/src/util-linux/libblkid/src/version.c	[]	[]
/src/util-linux/libmount/src/tab_parse.c	['test_mount_fuzz']	['test_mount_fuzz']

Directories in report

Directory
/src/util-linux/libblkid/src/superblocks/
/src/util-linux/login-utils/
/src/util-linux/./include/
/src/util-linux/libblkid/src/topology/
/src/util-linux/libfdisk/src/
/src/util-linux/lib/
/src/util-linux/libuuid/src/
/src/util-linux/libblkid/src/partitions/
/src/util-linux/libmount/src/
/src/util-linux/libblkid/src/
/usr/include/x86_64-linux-gnu/bits/