Fuzz introspector
For issues and ideas: https://github.com/ossf/fuzz-introspector/issues
Project coverage
Per-fuzzer coverage

Table of contents

Project overview: xnnpack
High level conclusions
Reachability and coverage overview
Fuzzers overview
Project functions overview
Fuzzer details
Fuzzer: fuzz_model
Call tree
Fuzz blockers
Runtime coverage analysis
Files reached
Analyses and suggestions
Optimal target analysis
Remaining optimal interesting functions
All functions overview
Runtime coverage analysis
Complex functions with low coverage
Files and Directories in report
Files in report
Directories in report
Metadata section
Function call coverage
Function in each files in report
Report generation date: 2023-06-07

Project overview: xnnpack

High level conclusions

Reachability and coverage overview

Functions statically reachable by fuzzers
10.0%
127 / 1295
Cyclomatic complexity statically reachable by fuzzers
10.0%
1309 / 12995
Runtime code coverage of functions
5.0%
71 / 1295

Fuzzers overview

Fuzzer Fuzzer filename Functions Reached Functions unreached Fuzzer depth Files reached Basic blocks reached Cyclomatic complexity Details
fuzz_model ../fuzz_model.cc 148 1181 10 41 2941 1352 fuzz_model.cc

Project functions overview

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 details

Fuzzer: fuzz_model

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

Full calltree

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 232 58.1%
gold [1:9] 129 32.3%
yellow [10:29] 3 0.75%
greenyellow [30:49] 17 4.26%
lawngreen 50+ 18 4.51%
All colors 399 100

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
17 17 2 :

['cpuinfo_log_error', 'calloc']

17 51 cpuinfo_x86_linux_init call site: 00240 /src/xnnpack/build/cpuinfo-source/src/x86/linux/init.c:333
10 30 7 :

['is_number', 'memcmp', 'is_zero_number', 'is_frequency', 'move_token', 'is_model_number', 'erase_matching']

10 30 transform_token call site: 00163 /src/xnnpack/build/cpuinfo-source/src/x86/name.c:314
8 53 7 :

['is_number', 'memcmp', 'is_zero_number', 'is_frequency', 'move_token', 'is_model_number', 'erase_matching']

8 53 transform_token call site: 00152 /src/xnnpack/build/cpuinfo-source/src/x86/name.c:233
6 8 2 :

['is_number', 'move_token']

6 18 transform_token call site: 00186 /src/xnnpack/build/cpuinfo-source/src/x86/name.c:494
4 4 1 :

['memcmp']

10 25 transform_token call site: 00174 /src/xnnpack/build/cpuinfo-source/src/x86/name.c:406
2 2 1 :

['memcmp']

8 23 transform_token call site: 00161 /src/xnnpack/build/cpuinfo-source/src/x86/name.c:299
2 2 1 :

['strncpy']

2 2 cpuinfo_x86_format_package_name call site: 00000 /src/xnnpack/build/cpuinfo-source/src/x86/name.c:699
0 134 2 :

['cpuid.4277', 'cpuinfo_x86_decode_cache_descriptor']

35 214 cpuinfo_x86_detect_cache call site: 00105 /src/xnnpack/build/cpuinfo-source/src/x86/cache/init.c:62
0 0 None 1893 1897 xnn_create_convolution2d_nhwc_qs8 call site: 00272 /src/xnnpack/src/operators/convolution-nhwc.c:901
0 0 None 1893 1893 xnn_create_convolution2d_nhwc_qs8 call site: 00273 /src/xnnpack/src/operators/convolution-nhwc.c:909
0 0 None 221 1004 cpuinfo_x86_linux_init call site: 00061 /src/xnnpack/build/cpuinfo-source/src/x86/linux/init.c:170
0 0 None 189 800 cpuinfo_x86_linux_init call site: 00074 /src/xnnpack/build/cpuinfo-source/src/x86/linux/init.c:204

Runtime coverage analysis

Covered functions
74
Functions that are reachable but not covered
76
Reachable functions
148
Percentage of reachable functions covered
48.65%
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
../fuzz_model.cc 1
src/init.c 3
src/hardware-config.c 2
build/cpuinfo-source/src/init.c 1
build/cpuinfo-source/src/x86/linux/init.c 7
build/cpuinfo-source/src/linux/processors.c 10
build/cpuinfo-source/src/linux/smallfile.c 1
build/cpuinfo-source/src/cpuinfo/log.h 4
build/cpuinfo-source/src/log.c 2
build/cpuinfo-source/src/linux/cpulist.c 4
build/cpuinfo-source/src/x86/linux/cpuinfo.c 4
build/cpuinfo-source/src/linux/multiline.c 1
build/cpuinfo-source/src/x86/init.c 1
build/cpuinfo-source/src/x86/cpuid.h 3
build/cpuinfo-source/src/x86/vendor.c 1
build/cpuinfo-source/src/x86/info.c 1
build/cpuinfo-source/src/x86/uarch.c 1
build/cpuinfo-source/src/x86/cache/init.c 1
build/cpuinfo-source/src/x86/cache/descriptor.c 1
build/cpuinfo-source/src/x86/cache/deterministic.c 2
build/cpuinfo-source/src/cpuinfo/utils.h 1
build/cpuinfo-source/src/x86/topology.c 1
build/cpuinfo-source/src/x86/isa.c 1
build/cpuinfo-source/src/x86/name.c 12
build/cpuinfo-source/src/cache.c 1
build/cpuinfo-source/include/cpuinfo.h 10
src/operators/convolution-nhwc.c 6
src/enums/operator-type.c 1
src/gemm-config.c 2
src/xnnpack/config.h 1
src/dwconv-config.c 2
src/xnnpack/allocator.h 5
src/operator-utils.c 1
src/xnnpack/operator-utils.h 1
src/cache.c 14
src/mutex.c 2
src/memory.c 3
src/xnnpack/log.h 3
src/microkernel-utils.c 2
src/operator-delete.c 1
src/packing.c 2

Analyses and suggestions

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
xnn_create_convolution2d_nhwc_f32 /src/xnnpack/src/operators/convolution-nhwc.c 23 ['int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'N/A', 'N/A', 'N/A', 'N/A', 'int ', 'struct.xnn_code_cache *', 'struct.xnn_weights_cache *', 'struct.xnn_operator **'] 7 0 207 35 14 176 0 1697 655
xnn_run_operator /src/xnnpack/src/operator-run.c 2 ['struct.xnn_operator *', 'struct.pthreadpool *'] 6 0 14 3 2 73 0 541 531
xnn_create_convolution2d_nhwc_qu8 /src/xnnpack/src/operators/convolution-nhwc.c 29 ['int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'char ', 'N/A', 'char ', 'N/A', 'char *', 'int *', 'char ', 'N/A', 'char ', 'char ', 'int ', 'struct.xnn_code_cache *', 'struct.xnn_weights_cache *', 'struct.xnn_operator **'] 7 0 195 33 12 143 0 1336 294
xnn_reshape_convolution2d_nhwc_f32 /src/xnnpack/src/operators/convolution-nhwc.c 7 ['struct.xnn_operator *', 'size_t ', 'size_t ', 'size_t ', 'size_t *', 'size_t *', 'struct.pthreadpool *'] 5 0 20 3 2 28 0 175 150
xnn_pack_f16_dwconv_hwg_w /src/xnnpack/src/packing.c 15 ['size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'N/A', 'N/A', 'N/A', 'size_t ', 'size_t ', 'char *'] 0 0 3086 416 144 1 0 146 144
xnn_x8_transposec_ukernel__16x16_reuse_mov_sse2 /src/xnnpack/src/amalgam/gen/sse2.c 7 ['char *', 'char *', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'union.xnn_x8_transpose_params *'] 0 0 3047 288 100 1 0 102 100
xnn_create_convolution2d_nhwc_f16 /src/xnnpack/src/operators/convolution-nhwc.c 23 ['int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'char *', 'char *', 'N/A', 'N/A', 'int ', 'struct.xnn_code_cache *', 'struct.xnn_weights_cache *', 'struct.xnn_operator **'] 7 0 202 30 12 150 0 1137 97
xnn_pack_f16_dwconv_ghw_w /src/xnnpack/src/packing.c 15 ['size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'N/A', 'N/A', 'N/A', 'size_t ', 'size_t ', 'char *'] 0 0 1914 266 90 2 0 94 90
xnn_create_convolution2d_nhwc_qc8 /src/xnnpack/src/operators/convolution-nhwc.c 28 ['int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'int ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'char ', 'N/A', 'N/A', 'char *', 'int *', 'char ', 'N/A', 'char ', 'char ', 'int ', 'struct.xnn_code_cache *', 'struct.xnn_weights_cache *', 'struct.xnn_operator **'] 7 0 258 47 17 144 0 1376 68
xnn_pack_f32_to_f16_dwconv_hwg_w /src/xnnpack/src/packing.c 15 ['size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'size_t ', 'N/A', 'N/A', 'N/A', 'size_t ', 'size_t ', 'char *'] 1 0 1220 200 64 4 0 74 64

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

Functions statically reachable by fuzzers
23.0%
293 / 1295
Cyclomatic complexity statically reachable by fuzzers
27.0%
3500 / 12995

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

Runtime coverage analysis

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
parse_entry 48 25 52.08% ['fuzz_model']
cpuinfo_x86_decode_cache_descriptor 1031 52 5.043% ['fuzz_model']
transform_token 215 55 25.58% ['fuzz_model']
cpuinfo_x86_decode_uarch 178 13 7.303% ['fuzz_model']
xnn_create_convolution2d_nhwc_qs8 83 30 36.14% ['fuzz_model']

Files and Directories in report

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/xnnpack/build/cpuinfo-source/src/cache.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/xnnpack/config.h ['fuzz_model'] []
/src/xnnpack/src/indirection.c [] []
/src/xnnpack/src/memory.c ['fuzz_model'] []
/src/xnnpack/build/cpuinfo-source/src/x86/name.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/cpuinfo-source/src/x86/cache/descriptor.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/operator-utils.c ['fuzz_model'] []
/src/xnnpack/src/operators/convolution-nhwc.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/gemm-config.c ['fuzz_model'] []
/src/xnnpack/src/unary-elementwise-config.c [] []
/src/xnnpack/build/cpuinfo-source/src/x86/cache/init.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/amalgam/gen/avx2.c [] []
/src/xnnpack/src/mutex.c ['fuzz_model'] []
/src/xnnpack/../fuzz_model.cc ['fuzz_model'] []
/src/xnnpack/src/allocator.c [] []
/src/xnnpack/build/cpuinfo-source/src/api.c [] []
/src/xnnpack/src/amalgam/gen/ssse3.c [] []
/src/xnnpack/src/amalgam/gen/fma3.c [] []
/src/xnnpack/src/amalgam/gen/avx512f.c [] []
/src/xnnpack/build/cpuinfo-source/src/cpuinfo/log.h ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/pthreadpool-source/src/threadpool-atomics.h [] []
/src/xnnpack/build/cpuinfo-source/src/x86/init.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/pthreadpool-source/src/portable-api.c [] []
/src/xnnpack/build/cpuinfo-source/include/cpuinfo.h ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/operator-delete.c ['fuzz_model'] []
/src/xnnpack/build/cpuinfo-source/src/x86/isa.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/cpuinfo-source/src/linux/processors.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/FP16-source/include/fp16/bitcasts.h [] []
/src/xnnpack/src/operator-run.c [] []
/src/xnnpack/src/amalgam/gen/sse41.c [] []
/src/xnnpack/build/cpuinfo-source/src/x86/linux/init.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/cpuinfo-source/src/x86/topology.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/microkernel-utils.c ['fuzz_model'] []
/src/xnnpack/build/pthreadpool-source/src/memory.c [] []
/src/xnnpack/src/init.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/cpuinfo-source/src/init.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/cpuinfo-source/src/x86/info.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/microparams-init.c [] []
/src/xnnpack/build/cpuinfo-source/src/x86/cache/deterministic.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/dwconv-config.c ['fuzz_model'] []
/src/xnnpack/build/cpuinfo-source/src/linux/smallfile.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/cpuinfo-source/src/log.c ['fuzz_model'] []
/src/xnnpack/build/FP16-source/include/fp16/fp16.h [] []
/src/xnnpack/src/packing.c ['fuzz_model'] []
/src/xnnpack/build/cpuinfo-source/src/x86/linux/cpuinfo.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/cpuinfo-source/src/linux/multiline.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/amalgam/gen/sse.c [] []
/src/xnnpack/src/xnnpack/log.h ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/cache.c ['fuzz_model'] []
/src/xnnpack/src/enums/microkernel-type.c [] []
/src/xnnpack/build/pthreadpool-source/src/pthreads.c [] []
/src/xnnpack/src/operators/post-operation.c [] []
/src/xnnpack/build/cpuinfo-source/src/x86/uarch.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/amalgam/gen/f16c.c [] []
/src/xnnpack/build/cpuinfo-source/src/x86/cpuid.h ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/amalgam/gen/scalar.c [] []
/src/xnnpack/src/amalgam/gen/xop.c [] []
/src/xnnpack/src/amalgam/gen/sse2.c [] []
/src/xnnpack/build/cpuinfo-source/src/x86/vendor.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/pthreadpool-source/src/threadpool-utils.h [] []
/src/xnnpack/build/cpuinfo-source/src/cpuinfo/utils.h ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/enums/operator-type.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/build/cpuinfo-source/src/linux/cpulist.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/hardware-config.c ['fuzz_model'] ['fuzz_model']
/src/xnnpack/src/xnnpack/allocator.h ['fuzz_model'] []
/src/xnnpack/build/FXdiv-source/include/fxdiv.h [] []
/src/xnnpack/src/amalgam/gen/avx.c [] []
/src/xnnpack/src/xnnpack/operator-utils.h ['fuzz_model'] []
/src/xnnpack/src/amalgam/gen/avx512skx.c [] []
/src/xnnpack/build/pthreadpool-source/src/fastpath.c [] []
/src/xnnpack/src/vmulcaddc-config.c [] []

Directories in report

Directory
/src/xnnpack/src/operators/
/src/xnnpack/build/cpuinfo-source/src/linux/
/src/xnnpack/build/cpuinfo-source/src/cpuinfo/
/src/xnnpack/build/cpuinfo-source/include/
/src/xnnpack/build/cpuinfo-source/src/x86/
/src/xnnpack/src/xnnpack/
/src/xnnpack/../
/src/xnnpack/src/enums/
/src/xnnpack/build/pthreadpool-source/src/
/src/xnnpack/build/FXdiv-source/include/
/src/xnnpack/build/FP16-source/include/fp16/
/src/xnnpack/src/amalgam/gen/
/src/xnnpack/build/cpuinfo-source/src/x86/linux/
/src/xnnpack/build/cpuinfo-source/src/
/src/xnnpack/build/cpuinfo-source/src/x86/cache/
/src/xnnpack/src/

Metadata section

This sections shows the raw data that is used to produce this report. This is mainly used for further processing and developer debugging.

Fuzzer Calltree file Program data file Coverage file
fuzz_model fuzzerLogFile-0-deAgQk5Y1m.data fuzzerLogFile-0-deAgQk5Y1m.data.yaml fuzz_model.covreport