High level conclusions

Fuzzers reach 84.88% code coverage.

Fuzzers reach 81.10% of cyclomatic complexity.

Fuzzers reach 66.95% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

310 / 463

Cyclomatic complexity statically reachable by fuzzers

2404 / 2964

Runtime code coverage of functions

393 / 463

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: ppmdenc_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	1	1.07%
gold	[1:9]	1	1.07%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	91	97.8%
All colors	93	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
0	0	None	0	121	Ppmd7_EncodeSymbol	call site: 00058	/src/lzma-fuzz/sdk/C/Ppmd7Enc.c:149
0	0	None	0	105	Ppmd7_DecodeSymbol	call site: 00087	/src/lzma-fuzz/sdk/C/Ppmd7Dec.c:150
0	0	None	0	0	LzmaAlloc(ISzAllocconst*,unsignedlong)	call site: 00000	/src/lzma-fuzz/./common-alloc.h:36
0	0	None	0	0	InputByteBuffer::Read()	call site: 00000	/src/lzma-fuzz/./common-buffer.h:232
0	0	None	0	0	SzAlloc	call site: 00000	/src/lzma-fuzz/sdk/C/7zAlloc.c:28
0	0	None	0	0	Ppmd7_Alloc	call site: 00003	/src/lzma-fuzz/sdk/C/Ppmd7.c:115
0	0	None	0	0	Ppmd7z_RangeDec_Init	call site: 00079	/src/lzma-fuzz/sdk/C/Ppmd7Dec.c:16
0	0	None	0	0	Ppmd7_DecodeSymbol	call site: 00083	/src/lzma-fuzz/sdk/C/Ppmd7Dec.c:115
0	0	None	0	0	Ppmd7_DecodeSymbol	call site: 00089	/src/lzma-fuzz/sdk/C/Ppmd7Dec.c:185

Runtime coverage analysis

Covered functions

53

Functions that are reachable but not covered

1

Reachable functions

48

Percentage of reachable functions covered

97.92%

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
ppmdenc_fuzzer.cc	1
sdk/C/Ppmd7.c	23
./common-buffer.h	6
sdk/C/Ppmd7Enc.c	7
sdk/C/Ppmd7Dec.c	3

Fuzzer: filters_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	1	2.63%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	37	97.3%
All colors	38	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
0	0	None	0	20	DeltaFuzzer::RunFilter(unsignedchar*,unsignedlong)	call site: 00000	/src/lzma-fuzz/filters_fuzzer.cc:190
0	0	None	0	5	CPU_Is_InOrder	call site: 00029	/src/lzma-fuzz/sdk/C/CpuArch.c:152
0	0	None	0	0	CPU_Is_Aes_Supported	call site: 00006	/src/lzma-fuzz/sdk/C/CpuArch.c:195
0	0	None	0	0	Sha256_Update	call site: 00000	/src/lzma-fuzz/sdk/C/Sha256.c:180

Runtime coverage analysis

Covered functions

62

Functions that are reachable but not covered

2

Reachable functions

39

Percentage of reachable functions covered

94.87%

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
filters_fuzzer.cc	16
sdk/C/Aes.c	1
sdk/C/CpuArch.c	5
sdk/C/7zCrc.c	1
sdk/C/XzCrc64.c	1

Fuzzer: lzmadec_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	2	9.09%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	20	90.9%
All colors	22	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
0	388	2 : View List ['LzmaDec_DecodeReal2', 'LzmaDec_TryDummy']	0	388	LzmaDec_DecodeToDic	call site: 00012	/src/lzma-fuzz/sdk/C/LzmaDec.c:929
0	388	2 : View List ['LzmaDec_DecodeReal2', 'LzmaDec_TryDummy']	0	388	LzmaDec_DecodeToDic	call site: 00017	/src/lzma-fuzz/sdk/C/LzmaDec.c:983
0	0	None	0	388	LzmaDec_DecodeToDic	call site: 00014	/src/lzma-fuzz/sdk/C/LzmaDec.c:980
0	0	None	0	4	LzmaDec_Allocate	call site: 00004	/src/lzma-fuzz/sdk/C/LzmaDec.c:1143
0	0	None	0	0	LzmaAlloc(ISzAllocconst*,unsignedlong)	call site: 00000	/src/lzma-fuzz/./common-alloc.h:36
0	0	None	0	0	SzAlloc	call site: 00000	/src/lzma-fuzz/sdk/C/7zAlloc.c:28
0	0	None	0	0	LzmaDec_DecodeToDic	call site: 00013	/src/lzma-fuzz/sdk/C/LzmaDec.c:957
0	0	None	0	0	LzmaProps_Decode	call site: 00001	/src/lzma-fuzz/sdk/C/LzmaDec.c:1085
0	0	None	0	0	LzmaDec_Allocate	call site: 00006	/src/lzma-fuzz/sdk/C/LzmaDec.c:1151
0	0	None	0	0	LzmaDec_DecodeReal_3	call site: 00015	/src/lzma-fuzz/sdk/C/LzmaDec.c:533
0	0	None	0	0	LzmaDec_AllocateProbs2	call site: 00005	/src/lzma-fuzz/sdk/C/LzmaDec.c:1113

Runtime coverage analysis

Covered functions

19

Functions that are reachable but not covered

0

Reachable functions

15

Percentage of reachable functions covered

100.0%

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
lzmadec_fuzzer.cc	1
sdk/C/LzmaDec.c	14

Fuzzer: lzma2dec_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	2	6.66%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	28	93.3%
All colors	30	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
0	388	2 : View List ['LzmaDec_DecodeReal2', 'LzmaDec_TryDummy']	0	388	LzmaDec_DecodeToDic	call site: 00025	/src/lzma-fuzz/sdk/C/LzmaDec.c:983
0	0	None	0	388	LzmaDec_DecodeToDic	call site: 00022	/src/lzma-fuzz/sdk/C/LzmaDec.c:980
0	0	None	0	4	LzmaDec_Allocate	call site: 00006	/src/lzma-fuzz/sdk/C/LzmaDec.c:1143
0	0	None	0	0	LzmaAlloc(ISzAllocconst*,unsignedlong)	call site: 00000	/src/lzma-fuzz/./common-alloc.h:36
0	0	None	0	0	SzAlloc	call site: 00000	/src/lzma-fuzz/sdk/C/7zAlloc.c:28
0	0	None	0	0	Lzma2Dec_DecodeToDic	call site: 00015	/src/lzma-fuzz/sdk/C/Lzma2Dec.c:209
0	0	None	0	0	Lzma2Dec_DecodeToDic	call site: 00016	/src/lzma-fuzz/sdk/C/Lzma2Dec.c:241
0	0	None	0	0	Lzma2Dec_GetOldProps	call site: 00003	/src/lzma-fuzz/sdk/C/Lzma2Dec.c:60
0	0	None	0	0	LzmaProps_Decode	call site: 00005	/src/lzma-fuzz/sdk/C/LzmaDec.c:1085
0	0	None	0	0	LzmaProps_Decode	call site: 00005	/src/lzma-fuzz/sdk/C/LzmaDec.c:1090
0	0	None	0	0	LzmaProps_Decode	call site: 00005	/src/lzma-fuzz/sdk/C/LzmaDec.c:1095
0	0	None	0	0	LzmaDec_Allocate	call site: 00008	/src/lzma-fuzz/sdk/C/LzmaDec.c:1151

Runtime coverage analysis

Covered functions

26

Functions that are reachable but not covered

0

Reachable functions

23

Percentage of reachable functions covered

100.0%

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
lzma2dec_fuzzer.cc	2
sdk/C/Lzma2Dec.c	7
sdk/C/LzmaDec.c	13

Fuzzer: xzdec_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	0	0.0%
gold	[1:9]	1	1.23%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	80	98.7%
All colors	81	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
21	21	1 : View List ['Lzma2Dec_AllocateProbs']	21	21	Lzma2State_SetProps	call site: 00000	/src/lzma-fuzz/sdk/C/XzDec.c:364
8	8	1 : View List ['Delta_Encode']	8	8	BraState_Filter	call site: 00000	/src/lzma-fuzz/sdk/C/XzDec.c:155
0	269	1 : View List ['Lzma2Dec_DecodeToDic']	0	269	Lzma2State_Code2	call site: 00000	/src/lzma-fuzz/sdk/C/XzDec.c:392
0	2	1 : View List ['LzmaDec_FreeProbs']	0	2	Lzma2State_Free	call site: 00000	/src/lzma-fuzz/sdk/C/XzDec.c:351
0	0	None	0	298	XzDecMt_Decode	call site: 00020	/src/lzma-fuzz/sdk/C/XzDec.c:2545
0	0	None	0	253	XzDecMt_Decode_ST	call site: 00022	/src/lzma-fuzz/sdk/C/XzDec.c:2326
0	0	None	0	253	XzDecMt_Decode_ST	call site: 00022	/src/lzma-fuzz/sdk/C/XzDec.c:2336
0	0	None	0	251	XzDecMt_Decode_ST	call site: 00023	/src/lzma-fuzz/sdk/C/XzDec.c:2397
0	0	None	0	251	XzDecMt_Decode_ST	call site: 00024	/src/lzma-fuzz/sdk/C/XzDec.c:2439
0	0	None	0	10	XzDecMt_Create	call site: 00011	/src/lzma-fuzz/sdk/C/XzDec.c:1514
0	0	None	0	5	CPU_Is_InOrder	call site: 00003	/src/lzma-fuzz/sdk/C/CpuArch.c:152
0	0	None	0	4	LzmaDec_Allocate	call site: 00000	/src/lzma-fuzz/sdk/C/LzmaDec.c:1143

Runtime coverage analysis

Covered functions

106

Functions that are reachable but not covered

1

Reachable functions

62

Percentage of reachable functions covered

98.39%

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.

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
xzdec_fuzzer.cc	1
sdk/C/7zCrc.c	3
sdk/C/CpuArch.c	4
sdk/C/XzCrc64.c	2
sdk/C/XzDec.c	31
./common-buffer.h	5
sdk/C/Alloc.c	1
sdk/C/Xz.c	5
sdk/C/Sha256.c	4

Fuzzer: lzmaenc_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	7	4.57%
gold	[1:9]	2	1.30%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	144	94.1%
All colors	153	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
9	9	1 : View List ['MatchFinder_Normalize']	9	33	MatchFinder_CheckLimits	call site: 00000	/src/lzma-fuzz/sdk/C/LzFind.c:375
0	0	None	0	407	LzmaEnc_CodeOneBlock	call site: 00117	/src/lzma-fuzz/sdk/C/LzmaEnc.c:2537
0	0	None	0	388	LzmaDec_DecodeToDic	call site: 00135	/src/lzma-fuzz/sdk/C/LzmaDec.c:942
0	0	None	0	121	LzmaDec_DecodeReal2	call site: 00137	/src/lzma-fuzz/sdk/C/LzmaDec.c:632
0	0	None	0	44	LzmaEnc_CodeOneBlock	call site: 00051	/src/lzma-fuzz/sdk/C/LzmaEnc.c:2282
0	0	None	0	41	LzmaEnc_Alloc	call site: 00025	/src/lzma-fuzz/sdk/C/LzmaEnc.c:2562
0	0	None	0	37	LzmaEnc_Alloc	call site: 00026	/src/lzma-fuzz/sdk/C/LzmaEnc.c:2576
0	0	None	0	37	LzmaEnc_Alloc	call site: 00027	/src/lzma-fuzz/sdk/C/LzmaEnc.c:2587
0	0	None	0	7	MatchFinder_Create	call site: 00028	/src/lzma-fuzz/sdk/C/LzFind.c:184
0	0	None	0	7	MatchFinder_Create	call site: 00032	/src/lzma-fuzz/sdk/C/LzFind.c:201
0	0	None	0	4	LzmaEnc_Alloc	call site: 00028	/src/lzma-fuzz/sdk/C/LzmaEnc.c:2605
0	0	None	0	0	LzmaAlloc(ISzAllocconst*,unsignedlong)	call site: 00000	/src/lzma-fuzz/./common-alloc.h:36

Runtime coverage analysis

Covered functions

108

Functions that are reachable but not covered

2

Reachable functions

85

Percentage of reachable functions covered

97.65%

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.

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
lzmaenc_fuzzer.cc	1
sdk/C/LzmaEnc.c	48
sdk/C/LzFind.c	9
./common-buffer.h	6
sdk/C/LzmaDec.c	12

Fuzzer: 7z_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	43	16.6%
gold	[1:9]	15	5.79%
yellow	[10:29]	5	1.93%
greenyellow	[30:49]	1	0.38%
lawngreen	50+	195	75.2%
All colors	259	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
25	25	1 : View List ['AllocUnitsRare']	25	25	AllocUnits	call site: 00165	/src/lzma-fuzz/sdk/C/Ppmd7.c:251
5	5	1 : View List ['SplitBlock']	5	5	ShrinkUnits	call site: 00137	/src/lzma-fuzz/sdk/C/Ppmd7.c:270
0	958	3 : View List ['SzAr_Init', 'SzAr_Free', 'SzReadAndDecodePackedStreams']	0	1408	SzReadHeader2	call site: 00211	/src/lzma-fuzz/sdk/C/7zArcIn.c:1130
0	388	2 : View List ['LzmaDec_DecodeReal2', 'LzmaDec_TryDummy']	0	388	LzmaDec_DecodeToDic	call site: 00108	/src/lzma-fuzz/sdk/C/LzmaDec.c:983
0	232	12 : View List ['SzAr_GetFolderUnpackSize', 'ReadBitVector', 'RememberBitVector', 'ReadNumber', 'SzBitUi32s_Free', 'SzReadNumber32', 'SkipData', 'SzBitUi32s_Alloc', 'SzReadFileNames', 'CountDefinedBits', 'ReadUi32s', 'ReadTime']	0	232	SzReadHeader2	call site: 00221	/src/lzma-fuzz/sdk/C/7zArcIn.c:1205
0	183	5 : View List ['SkipData', 'ReadBitUi32s', 'WaitId', 'SzReadNumber32', 'ReadNumber']	0	183	ReadUnpackInfo	call site: 00044	/src/lzma-fuzz/sdk/C/7zArcIn.c:660
0	24	1 : View List ['Rescale']	0	111	Ppmd7_Update1	call site: 00173	/src/lzma-fuzz/sdk/C/Ppmd7.c:681
0	16	1 : View List ['SzReadNumber32']	0	16	SzReadHeader2	call site: 00240	/src/lzma-fuzz/sdk/C/7zArcIn.c:1445
0	16	1 : View List ['SzReadNumber32']	0	16	ReadTime	call site: 00231	/src/lzma-fuzz/sdk/C/7zArcIn.c:1057
0	13	1 : View List ['SkipData']	0	72	SzReadHeader2	call site: 00234	/src/lzma-fuzz/sdk/C/7zArcIn.c:1284
0	11	1 : View List ['RestartModel']	0	11	UpdateModel	call site: 00146	/src/lzma-fuzz/sdk/C/Ppmd7.c:464
0	3	1 : View List ['CountDefinedBits']	0	52	ReadSubStreamsInfo	call site: 00064	/src/lzma-fuzz/sdk/C/7zArcIn.c:899

Runtime coverage analysis

Covered functions

124

Functions that are reachable but not covered

6

Reachable functions

114

Percentage of reachable functions covered

94.74%

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
7z_fuzzer.cc	1
sdk/C/7zCrc.c	2
sdk/C/CpuArch.c	4
sdk/C/7zArcIn.c	34
./common-buffer.h	2
sdk/C/7zStream.c	3
sdk/C/7zBuf.c	3
sdk/C/7zDec.c	9
sdk/C/LzmaDec.c	11
sdk/C/Lzma2Dec.c	6
sdk/C/Ppmd7.c	23
sdk/C/Ppmd7Dec.c	3
sdk/C/Bcj2.c	2
sdk/C/Delta.c	3
sdk/C/Bra86.c	1
sdk/C/Bra.c	4
sdk/C/BraIA64.c	1

Fuzzer: lzma2enc_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	20	10.4%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	171	89.5%
All colors	191	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
9	9	1 : View List ['MatchFinder_Normalize']	9	33	MatchFinder_CheckLimits	call site: 00000	/src/lzma-fuzz/sdk/C/LzFind.c:375
0	388	2 : View List ['LzmaDec_DecodeReal2', 'LzmaDec_TryDummy']	0	388	LzmaDec_DecodeToDic	call site: 00172	/src/lzma-fuzz/sdk/C/LzmaDec.c:924
0	0	None	101	638	Lzma2Enc_EncodeMt1	call site: 00022	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:512
0	0	None	101	587	Lzma2Enc_EncodeMt1	call site: 00023	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:522
0	0	None	101	587	Lzma2Enc_EncodeMt1	call site: 00023	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:538
0	0	None	101	545	Lzma2Enc_EncodeMt1	call site: 00037	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:555
0	0	None	101	545	Lzma2Enc_EncodeMt1	call site: 00037	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:562
0	0	None	101	545	Lzma2Enc_EncodeMt1	call site: 00066	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:593
0	0	None	101	545	Lzma2Enc_EncodeMt1	call site: 00070	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:600
0	0	None	101	545	Lzma2Enc_EncodeMt1	call site: 00070	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:604
0	0	None	101	545	Lzma2Enc_EncodeMt1	call site: 00148	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:608
0	0	None	0	407	LzmaEnc_CodeOneBlock	call site: 00143	/src/lzma-fuzz/sdk/C/LzmaEnc.c:2537

Runtime coverage analysis

Covered functions

132

Functions that are reachable but not covered

5

Reachable functions

111

Percentage of reachable functions covered

95.5%

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
lzma2enc_fuzzer.cc	1
sdk/C/Lzma2Enc.c	14
sdk/C/LzmaEnc.c	53
./common-buffer.h	7
sdk/C/LzFind.c	9
sdk/C/Lzma2Dec.c	7
sdk/C/LzmaDec.c	11

Fuzzer: xzenc_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	33	10.9%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	268	89.0%
All colors	301	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
61	61	1 : View List ['XzEncProps_Normalize_Fixed']	61	61	XzProps_Normalize	call site: 00020	/src/lzma-fuzz/sdk/C/XzEnc.c:586
21	21	1 : View List ['Lzma2Dec_AllocateProbs']	21	21	Lzma2State_SetProps	call site: 00000	/src/lzma-fuzz/sdk/C/XzDec.c:364
13	13	1 : View List ['MixCoder_ResetFromMethod']	13	17	XzDecMix_Init	call site: 00259	/src/lzma-fuzz/sdk/C/XzDec.c:890
9	9	1 : View List ['MatchFinder_Normalize']	9	33	MatchFinder_CheckLimits	call site: 00000	/src/lzma-fuzz/sdk/C/LzFind.c:375
4	4	1 : View List ['XzEnc_FreeOutBufs']	4	712	XzEnc_Encode	call site: 00037	/src/lzma-fuzz/sdk/C/XzEnc.c:1219
0	388	2 : View List ['LzmaDec_DecodeReal2', 'LzmaDec_TryDummy']	0	388	LzmaDec_DecodeToDic	call site: 00000	/src/lzma-fuzz/sdk/C/LzmaDec.c:929
0	269	1 : View List ['Lzma2Dec_DecodeToDic']	0	269	Lzma2State_Code2	call site: 00000	/src/lzma-fuzz/sdk/C/XzDec.c:392
0	5	1 : View List ['XzEncIndex_ReAlloc']	0	5	XzEncIndex_AddIndexRecord	call site: 00208	/src/lzma-fuzz/sdk/C/XzEnc.c:180
0	2	1 : View List ['LzmaDec_FreeProbs']	0	2	Lzma2State_Free	call site: 00000	/src/lzma-fuzz/sdk/C/XzDec.c:351
0	0	None	101	638	Lzma2Enc_EncodeMt1	call site: 00070	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:512
0	0	None	101	587	Lzma2Enc_EncodeMt1	call site: 00071	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:522
0	0	None	101	587	Lzma2Enc_EncodeMt1	call site: 00071	/src/lzma-fuzz/sdk/C/Lzma2Enc.c:538

Runtime coverage analysis

Covered functions

229

Functions that are reachable but not covered

10

Reachable functions

174

Percentage of reachable functions covered

94.25%

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
xzenc_fuzzer.cc	1
sdk/C/7zCrc.c	3
sdk/C/CpuArch.c	4
sdk/C/XzCrc64.c	2
sdk/C/XzEnc.c	32
sdk/C/Lzma2Enc.c	12
sdk/C/LzmaEnc.c	52
./common-buffer.h	7
sdk/C/Xz.c	5
sdk/C/Sha256.c	4
sdk/C/XzDec.c	31
sdk/C/LzFind.c	9
sdk/C/Alloc.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
Bt4_MatchFinder_GetMatches	/src/lzma-fuzz/sdk/C/LzFind.c	2	['N/A', 'N/A']	4	0	477	39	15	13	0	80	80

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

Functions statically reachable by fuzzers

324 / 463

Cyclomatic complexity statically reachable by fuzzers

2484 / 2964

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.

ppmdenc_fuzzer.cc

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=['AllocUnitsRare']

filters_fuzzer.cc

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=['AesFuzzer::AesFuzzer(unsigned char const*, unsigned long)']

lzmadec_fuzzer.cc

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=['LzmaDec_Allocate', 'LzmaDec_DecodeToDic']

lzma2dec_fuzzer.cc

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=['LzmaDec_Allocate', 'LzmaDec_DecodeToDic']

xzdec_fuzzer.cc

Dictionary

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

lzmaenc_fuzzer.cc

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=['LzmaDec_DecodeReal2', 'LzmaEnc_Alloc', 'MatchFinder_Create', 'LzmaEnc_CodeOneBlock']

7z_fuzzer.cc

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=['CreateSuccessors', 'SzReadHeader2', 'SzFolder_Decode2', 'ShrinkUnits', 'ReadSubStreamsInfo', 'AllocUnits', 'ReadTime', 'ReadPackInfo', 'LzmaDec_DecodeToDic']

lzma2enc_fuzzer.cc

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=['LzmaEnc_CodeOneBlock', 'LzmaEnc_InitPrices', 'LenEnc_Encode', 'LzmaDec_DecodeReal2', 'LzmaEnc_Alloc', 'MatchFinder_Create']

xzenc_fuzzer.cc

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=['LzmaEnc_CodeOneBlock', 'LzmaEnc_InitPrices', 'Lzma2EncProps_Normalize', 'LenEnc_Encode', 'Xz_CompressBlock', 'MixCoder_SetFromMethod', 'Xz_WriteHeader', 'SeqInFilter_Init', 'LzmaEnc_Alloc']

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
Lzma2EncProps_Normalize	90	44	48.88%	['lzma2enc_fuzzer', 'xzenc_fuzzer']
XzProps_Normalize	59	28	47.45%	['xzenc_fuzzer']

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/lzma-fuzz/sdk/C/AesOpt.c	[]	[]
/src/lzma-fuzz/sdk/C/Bra.c	['7z_fuzzer']	['7z_fuzzer']
/src/lzma-fuzz/lzmadec_fuzzer.cc	['lzmadec_fuzzer']	['lzmadec_fuzzer']
/src/lzma-fuzz/sdk/C/XzEnc.c	['xzenc_fuzzer']	['xzenc_fuzzer']
/src/lzma-fuzz/sdk/C/Sha256.c	['xzdec_fuzzer', 'xzenc_fuzzer']	['xzdec_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/filters_fuzzer.cc	['filters_fuzzer']	['filters_fuzzer']
/src/lzma-fuzz/sdk/C/BraIA64.c	['7z_fuzzer']	['7z_fuzzer']
/src/lzma-fuzz/sdk/C/7zCrcOpt.c	[]	[]
/src/lzma-fuzz/sdk/C/LzFind.c	['lzmaenc_fuzzer', 'lzma2enc_fuzzer', 'xzenc_fuzzer']	['lzmaenc_fuzzer', 'lzma2enc_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/sdk/C/7zStream.c	['7z_fuzzer']	['7z_fuzzer']
/src/lzma-fuzz/sdk/C/Ppmd7.c	['ppmdenc_fuzzer', '7z_fuzzer']	['ppmdenc_fuzzer', '7z_fuzzer']
/src/lzma-fuzz/sdk/C/Bcj2.c	['7z_fuzzer']	['7z_fuzzer']
/src/lzma-fuzz/sdk/C/Lzma2Enc.c	['lzma2enc_fuzzer', 'xzenc_fuzzer']	['lzma2enc_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/sdk/C/LzmaEnc.c	['lzmaenc_fuzzer', 'lzma2enc_fuzzer', 'xzenc_fuzzer']	['lzmaenc_fuzzer', 'lzma2enc_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/lzmaenc_fuzzer.cc	['lzmaenc_fuzzer']	['lzmaenc_fuzzer']
/src/lzma-fuzz/lzma2dec_fuzzer.cc	['lzma2dec_fuzzer']	['lzma2dec_fuzzer']
/src/lzma-fuzz/xzenc_fuzzer.cc	['xzenc_fuzzer']	['xzenc_fuzzer']
/src/lzma-fuzz/sdk/C/7zCrc.c	['filters_fuzzer', 'xzdec_fuzzer', '7z_fuzzer', 'xzenc_fuzzer']	['filters_fuzzer', 'xzdec_fuzzer', '7z_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/sdk/C/Xz.c	['xzdec_fuzzer', 'xzenc_fuzzer']	['xzdec_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/xzdec_fuzzer.cc	['xzdec_fuzzer']	['xzdec_fuzzer']
/src/lzma-fuzz/sdk/C/XzCrc64.c	['filters_fuzzer', 'xzdec_fuzzer', 'xzenc_fuzzer']	['filters_fuzzer', 'xzdec_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/sdk/C/Ppmd7Dec.c	['ppmdenc_fuzzer', '7z_fuzzer']	['ppmdenc_fuzzer', '7z_fuzzer']
/src/lzma-fuzz/sdk/C/7zArcIn.c	['7z_fuzzer']	['7z_fuzzer']
/src/lzma-fuzz/./common-alloc.h	[]	[]
/src/lzma-fuzz/sdk/C/XzCrc64Opt.c	[]	[]
/src/lzma-fuzz/sdk/C/Alloc.c	['xzdec_fuzzer', 'xzenc_fuzzer']	['xzdec_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/7z_fuzzer.cc	['7z_fuzzer']	['7z_fuzzer']
/src/lzma-fuzz/sdk/C/Ppmd7Enc.c	['ppmdenc_fuzzer']	['ppmdenc_fuzzer']
/src/lzma-fuzz/sdk/C/CpuArch.c	['filters_fuzzer', 'xzdec_fuzzer', '7z_fuzzer', 'xzenc_fuzzer']	['filters_fuzzer', 'xzdec_fuzzer', '7z_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/sdk/C/Aes.c	['filters_fuzzer']	['filters_fuzzer']
/src/lzma-fuzz/sdk/C/7zBuf.c	['7z_fuzzer']	['7z_fuzzer']
/src/lzma-fuzz/lzma2enc_fuzzer.cc	['lzma2enc_fuzzer']	['lzma2enc_fuzzer']
/src/lzma-fuzz/./common-buffer.h	['ppmdenc_fuzzer', 'xzdec_fuzzer', 'lzmaenc_fuzzer', '7z_fuzzer', 'lzma2enc_fuzzer', 'xzenc_fuzzer']	[]
/src/lzma-fuzz/sdk/C/Lzma2Dec.c	['lzma2dec_fuzzer', '7z_fuzzer', 'lzma2enc_fuzzer']	['lzma2dec_fuzzer', '7z_fuzzer', 'lzma2enc_fuzzer']
/src/lzma-fuzz/sdk/C/XzDec.c	['xzdec_fuzzer', 'xzenc_fuzzer']	['xzdec_fuzzer', 'xzenc_fuzzer']
/src/lzma-fuzz/ppmdenc_fuzzer.cc	['ppmdenc_fuzzer']	['ppmdenc_fuzzer']
/src/lzma-fuzz/sdk/C/Bra86.c	['7z_fuzzer']	['7z_fuzzer']
/src/lzma-fuzz/sdk/C/Delta.c	['7z_fuzzer']	[]
/src/lzma-fuzz/sdk/C/7zAlloc.c	[]	[]
/src/lzma-fuzz/sdk/C/LzmaDec.c	['lzmadec_fuzzer', 'lzma2dec_fuzzer', 'lzmaenc_fuzzer', '7z_fuzzer', 'lzma2enc_fuzzer']	['lzmadec_fuzzer', 'lzma2dec_fuzzer', 'lzmaenc_fuzzer', '7z_fuzzer', 'lzma2enc_fuzzer']
/src/lzma-fuzz/sdk/C/7zDec.c	['7z_fuzzer']	['7z_fuzzer']

Directories in report

Directory
/src/lzma-fuzz/sdk/C/
/src/lzma-fuzz/
/src/lzma-fuzz/./