High level conclusions

Fuzzers reach 91.74% of cyclomatic complexity.

Fuzzers reach 91.76% of all functions.

Fuzzers reach 91.37% code coverage.

Reachability and coverage overview

Functions statically reachable by fuzzers

234 / 255

Cyclomatic complexity statically reachable by fuzzers

2513 / 2739

Runtime code coverage of functions

233 / 255

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_astc_physical_to_symbolic

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	0	0.0%
gold	[1:9]	16	17.7%
yellow	[10:29]	2	2.22%
greenyellow	[30:49]	5	5.55%
lawngreen	50+	67	74.4%
All colors	90	100

Runtime coverage analysis

Covered functions

37

Functions that are reachable but not covered

4

Reachable functions

75

Percentage of reachable functions covered

94.67%

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
/src/astc-encoder/Source/./Fuzzers/fuzz_astc_physical_to_symbolic.cpp	2
/src/astc-encoder/Source/./astcenc_block_sizes.cpp	9
/src/astc-encoder/Source/./astcenc_mathlib.h	2
/src/astc-encoder/Source/./astcenc_integer_sequence.cpp	3
/src/astc-encoder/Source/./astcenc_mathlib.cpp	3
/src/astc-encoder/Source/./astcenc_percentile_tables.cpp	2
/src/astc-encoder/Source/./astcenc_internal.h	5
/src/astc-encoder/Source/./astcenc_partition_tables.cpp	7
/src/astc-encoder/Source/./astcenc_symbolic_physical.cpp	3

Fuzzer: fuzz_astc_decompress

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	36	13.1%
gold	[1:9]	0	0.0%
yellow	[10:29]	1	0.36%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	236	86.4%
All colors	273	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
12	258	store_image_block(astcenc_image&, image_block const&, block_size_descriptor const&, unsigned int, unsigned int, unsigned int, astcenc_swizzle const&)	call site: 00258	__assert_fail
11	63	astcenc_context_alloc	call site: 00063	__assert_fail
6	142	physical_to_symbolic(block_size_descriptor const&, unsigned char const*, symbolic_compressed_block&)	call site: 00142
2	114	astcenc_context_alloc	call site: 00114
1	5	validate_block_size(unsigned int, unsigned int, unsigned int)	call site: 00005
1	27	astcenc_context_alloc	call site: 00027
1	29	ParallelManager::ParallelManager()	call site: 00029
1	56	validate_config(astcenc_config&)	call site: 00056
1	61	block_size_descriptor* aligned_malloc (unsigned long, unsigned long)	call site: 00061

Runtime coverage analysis

Covered functions

201

Functions that are reachable but not covered

35

Reachable functions

225

Percentage of reachable functions covered

84.44%

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
/src/astc-encoder/Source/./Fuzzers/fuzz_astc_decompress.cpp	1
/src/astc-encoder/Source/./astcenc_entry.cpp	12
/src/astc-encoder/Source/./astcenc_mathlib.h	16
/src/astc-encoder/Source/./astcenc_percentile_tables.cpp	4
/src/astc-encoder/Source/./astcenc_vecmathlib_common_4.h	1
/src/astc-encoder/Source/./astcenc_internal_entry.h	8
/src/astc-encoder/Source/./astcenc_internal.h	13
/src/astc-encoder/Source/./astcenc_block_sizes.cpp	9
/src/astc-encoder/Source/./astcenc_integer_sequence.cpp	3
/src/astc-encoder/Source/./astcenc_mathlib.cpp	3
/src/astc-encoder/Source/./astcenc_partition_tables.cpp	7
/src/astc-encoder/Source/./astcenc_weight_align.cpp	1
/src/astc-encoder/Source/./astcenc_symbolic_physical.cpp	3
/src/astc-encoder/Source/./astcenc_decompress_symbolic.cpp	5
/src/astc-encoder/Source/./astcenc_mathlib_softfloat.cpp	8
/src/astc-encoder/Source/./astcenc_color_unquantize.cpp	18
/src/astc-encoder/Source/./astcenc_image.cpp	1

Fuzzer: fuzz_astc_compress

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	50	5.70%
gold	[1:9]	2	0.22%
yellow	[10:29]	3	0.34%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	821	93.7%
All colors	876	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
11	63	astcenc_context_alloc	call site: 00063	__assert_fail
11	136	ParallelManager::get_task_assignment(unsigned int, unsigned int&)	call site: 00136
11	150	sf16_to_float(unsigned short)	call site: 00150	__assert_fail
3	132	astcenc_compress_reset	call site: 00132
3	176	float_to_sf16(float)	call site: 00176
2	114	astcenc_context_alloc	call site: 00114
2	166	compress_image(astcenc_context&, unsigned int, astcenc_image const&, astcenc_swizzle const&, unsigned char*)	call site: 00166
2	559	unpack_color_endpoints(astcenc_profile, int, unsigned char const*, bool&, bool&, vint4&, vint4&)	call site: 00559
1	5	validate_block_size(unsigned int, unsigned int, unsigned int)	call site: 00005
1	27	astcenc_context_alloc	call site: 00027
1	29	ParallelManager::ParallelManager()	call site: 00029
1	56	validate_config(astcenc_config&)	call site: 00056

Runtime coverage analysis

Covered functions

386

Functions that are reachable but not covered

36

Reachable functions

442

Percentage of reachable functions covered

91.86%

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
/src/astc-encoder/Source/./Fuzzers/fuzz_astc_compress.cpp	1
/src/astc-encoder/Source/./astcenc_entry.cpp	14
/src/astc-encoder/Source/./astcenc_mathlib.h	23
/src/astc-encoder/Source/./astcenc_percentile_tables.cpp	4
/src/astc-encoder/Source/./astcenc_vecmathlib_common_4.h	1
/src/astc-encoder/Source/./astcenc_internal_entry.h	11
/src/astc-encoder/Source/./astcenc_internal.h	24
/src/astc-encoder/Source/./astcenc_block_sizes.cpp	9
/src/astc-encoder/Source/./astcenc_integer_sequence.cpp	3
/src/astc-encoder/Source/./astcenc_mathlib.cpp	3
/src/astc-encoder/Source/./astcenc_partition_tables.cpp	7
/src/astc-encoder/Source/./astcenc_weight_align.cpp	6
/src/astc-encoder/Source/./astcenc_compute_variance.cpp	2
/src/astc-encoder/Source/./astcenc_mathlib_softfloat.cpp	8
/src/astc-encoder/Source/./astcenc_compress_symbolic.cpp	7
/src/astc-encoder/Source/./astcenc_symbolic_physical.cpp	3
/src/astc-encoder/Source/./astcenc_ideal_endpoints_and_weights.cpp	15
/src/astc-encoder/Source/./astcenc_averages_and_directions.cpp	8
/src/astc-encoder/Source/./astcenc_pick_best_endpoint_format.cpp	11
/src/astc-encoder/Source/./astcenc_color_quantize.cpp	29
/src/astc-encoder/Source/./astcenc_color_unquantize.cpp	18
/src/astc-encoder/Source/./astcenc_decompress_symbolic.cpp	3
/src/astc-encoder/Source/./astcenc_find_best_partitioning.cpp	11

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
astcenc_get_block_info	/src/astc-encoder/Source/./astcenc_entry.cpp	3	['N/A', 'N/A', 'N/A']	4	0	4502	133	44	83	0	298	44
compute_symbolic_block_difference_1plane_1partition(astcenc_configconst&,block_size_descriptorconst&,symbolic_compressed_blockconst&,image_blockconst&)	/src/astc-encoder/Source/./astcenc_decompress_symbolic.cpp	4	['N/A', 'N/A', 'N/A', 'N/A']	4	0	5966	126	40	59	0	195	40
load_image_block(astcenc_profile,astcenc_imageconst&,image_block&,block_size_descriptorconst&,unsignedint,unsignedint,unsignedint,astcenc_swizzleconst&)	/src/astc-encoder/Source/./astcenc_image.cpp	8	['int', 'N/A', 'N/A', 'N/A', 'int', 'int', 'int', 'N/A']	3	0	3361	115	39	12	0	54	39

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

Functions statically reachable by fuzzers

237 / 255

Cyclomatic complexity statically reachable by fuzzers

2636 / 2739

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.

/src/astc-encoder/Source/./Fuzzers/fuzz_astc_physical_to_symbolic.cpp

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

/src/astc-encoder/Source/./Fuzzers/fuzz_astc_decompress.cpp

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=['store_image_block(astcenc_image&, image_block const&, block_size_descriptor const&, unsigned int, unsigned int, unsigned int, astcenc_swizzle const&)', 'astcenc_context_alloc', 'physical_to_symbolic(block_size_descriptor const&, unsigned char const*, symbolic_compressed_block&)', 'validate_block_size(unsigned int, unsigned int, unsigned int)', 'ParallelManager::ParallelManager()', 'validate_config(astcenc_config&)', 'block_size_descriptor* aligned_malloc(unsigned long, unsigned long)']

/src/astc-encoder/Source/./Fuzzers/fuzz_astc_compress.cpp

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=['astcenc_context_alloc', 'ParallelManager::get_task_assignment(unsigned int, unsigned int&)', 'sf16_to_float(unsigned short)', 'astcenc_compress_reset', 'float_to_sf16(float)', 'compress_image(astcenc_context&, unsigned int, astcenc_image const&, astcenc_swizzle const&, unsigned char*)', 'unpack_color_endpoints(astcenc_profile, int, unsigned char const*, bool&, bool&, vint4&, vint4&)', 'validate_block_size(unsigned int, unsigned int, unsigned int)']

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
get_packed_table(int,int)	49	21	42.85%	['fuzz_astc_decompress', 'fuzz_astc_physical_to_symbolic', 'fuzz_astc_compress']
store_image_block(astcenc_image&,image_blockconst&,block_size_descriptorconst&,unsignedint,unsignedint,unsignedint,astcenc_swizzleconst&)	176	60	34.09%	['fuzz_astc_decompress']
ParallelManager::complete_task_assignment(unsignedint)	38	17	44.73%	['fuzz_astc_decompress', 'fuzz_astc_compress']

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/astc-encoder/Source/./astcenc_compute_variance.cpp	['fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_entry.cpp	['fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_block_sizes.cpp	['fuzz_astc_physical_to_symbolic', 'fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_mathlib.cpp	['fuzz_astc_physical_to_symbolic', 'fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_image.cpp	['fuzz_astc_decompress']	[]
/src/astc-encoder/Source/./astcenc_internal_entry.h	['fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_averages_and_directions.cpp	['fuzz_astc_compress']	[]
/src/astc-encoder/Source/./Fuzzers/fuzz_astc_decompress.cpp	['fuzz_astc_decompress']	[]
/src/astc-encoder/Source/./astcenc_vecmathlib_common_4.h	['fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/usr/local/bin/../include/c++/v1/stdexcept	[]	[]
/src/astc-encoder/Source/./astcenc_internal.h	['fuzz_astc_physical_to_symbolic', 'fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_color_quantize.cpp	['fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_symbolic_physical.cpp	['fuzz_astc_physical_to_symbolic', 'fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_partition_tables.cpp	['fuzz_astc_physical_to_symbolic', 'fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_pick_best_endpoint_format.cpp	['fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_mathlib.h	['fuzz_astc_physical_to_symbolic', 'fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_color_unquantize.cpp	['fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/usr/local/bin/../include/c++/v1/__exception/exception.h	[]	[]
/src/astc-encoder/Source/./Fuzzers/fuzz_astc_physical_to_symbolic.cpp	['fuzz_astc_physical_to_symbolic']	[]
/src/astc-encoder/Source/./astcenc_ideal_endpoints_and_weights.cpp	['fuzz_astc_compress']	[]
/src/astc-encoder/Source/./Fuzzers/fuzz_astc_compress.cpp	['fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_percentile_tables.cpp	['fuzz_astc_physical_to_symbolic', 'fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_weight_align.cpp	['fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_compress_symbolic.cpp	['fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_decompress_symbolic.cpp	['fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_find_best_partitioning.cpp	['fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_mathlib_softfloat.cpp	['fuzz_astc_decompress', 'fuzz_astc_compress']	[]
/src/astc-encoder/Source/./astcenc_integer_sequence.cpp	['fuzz_astc_physical_to_symbolic', 'fuzz_astc_decompress', 'fuzz_astc_compress']	[]

Directories in report

Directory
/src/astc-encoder/Source/./Fuzzers/
/usr/local/bin/../include/c++/v1/
/usr/local/bin/../include/c++/v1/__exception/
/src/astc-encoder/Source/./