Project overview
High level conclusions
Reachability and coverage overview
Fuzzers overview
| Fuzzer | Fuzzer filename | Functions Reached | Functions unreached | Fuzzer depth | Files reached | Basic blocks reached | Cyclomatic complexity | Details |
|---|---|---|---|---|---|---|---|---|
| fuzzer-decoder | oss-fuzz-fuzzers/xvid/fuzzer.cpp | 106 | 354 | 8 | 20 | 3615 | 1512 | fuzzer.cpp |
Project functions overview
The following table shows data about each function in the project. The functions included in this table corresponds 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: fuzzer-decoder
Call tree overview
The following is the call tree with color coding for which functions are hit/not hit. This info is based on the coverage achieved of all fuzzers together and not just this specific fuzzer. This should change in the future to be per-fuzzer-basis.
For further technical details on what the call tree overview is, please see the Glossary .
Full calltree
The following link provides a visualisation of the full calltree overlayed with coverage information: full calltree
For futher technical details on how the call tree is made, please see the Glossary .
Fuzz blockers
The followings nodes represent call sites where fuzz blockers occur
| Amount of callsites blocked | Calltree index | Parent function | Callsite | Largest blocked function |
|---|---|---|---|---|
| 19 | 79 | xvid_decore | call site | decoder_output |
| 8 | 102 | image_output | call site | safe_packed_conv |
| 7 | 59 | decoder_resize | call site | image_destroy |
| 3 | 623 | decoder_decode | call site | decoder_output |
| 2 | 49 | image_create | call site | xvid_free |
| 2 | 99 | decoder_output | call site | safe_packed_conv |
| 2 | 554 | decoder_pframe | call site | output_slice |
| 1 | 5 | decoder_create | call site | xvid_free |
| 1 | 47 | image_create | call site | xvid_free |
| 1 | 113 | decoder_decode | call site | image_output |
Functions hit (dynamic analysis based)
| Function name | source code lines | source lines hit | percentage hit |
|---|
Files hit
| filename | functions hit |
|---|---|
| oss-fuzz-fuzzers/xvid/fuzzer.cpp | 1 |
| / | 11 |
| trunk/xvidcore/build/generic/../..xvid.c | 1 |
| trunk/xvidcore/build/generic/../..decoder.c | 21 |
| trunk/xvidcore/build/generic/../..utils/mem_align.c | 2 |
| trunk/xvidcore/build/generic/../..image/image.h | 1 |
| trunk/xvidcore/build/generic/../..image/postprocessing.c | 9 |
| trunk/xvidcore/build/generic/../..quant/quant_matrix.c | 6 |
| trunk/xvidcore/build/generic/../..image/image.c | 9 |
| trunk/xvidcore/build/generic/../..motion/../global.h | 2 |
| trunk/xvidcore/build/generic/../..bitstream/bitstream.h | 8 |
| trunk/xvidcore/build/generic/../..bitstream/bitstream.c | 6 |
| trunk/xvidcore/build/generic/../..bitstream/mbcoding.c | 11 |
| trunk/xvidcore/build/generic/../..bitstream/../utils/../bitstream/bitstream.h | 6 |
| trunk/xvidcore/build/generic/../..prediction/mbprediction.c | 5 |
| trunk/xvidcore/build/generic/../..motion/gmc.c | 3 |
| trunk/xvidcore/build/generic/../..motion/gmc.h | 1 |
| trunk/xvidcore/build/generic/../..image/qpel.h | 4 |
| trunk/xvidcore/build/generic/../..image/interpolate8x8.h | 4 |
| trunk/xvidcore/build/generic/../..image/font.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 reaches a high amount of 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
xvid_encore
|
/src/trunk/xvidcore/build/generic/../../src/xvid.c | 4 | ['char *', 'int ', 'char *', 'char *'] | 9 | 0 | 39 | 8 | 9 | 200 | 0 | 2309 | 2060 |
LLVMFuzzerInitialize
|
/src/oss-fuzz-fuzzers/xvid/fuzzer.cpp | 2 | ['int *', 'char ***'] | 4 | 0 | 25 | 5 | 2 | 113 | 0 | 1630 | 1600 |
Implementing fuzzers that target the above functions will improve reachability such that it becomes:
All functions overview
The status of all functions in the project will be as follows if you implement fuzzers for these functions
| 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 gives analysis based on data about the runtime coverage information
For futher technical details on how this section is made, please see the Glossary .
Complex functions with low coverage
| Func name | Function total lines | Lines covered at runtime | percentage covered |
|---|---|---|---|
| image_output | 137 | 13 | 9.489 |