2.1 KiB
Fuzzer for libmedia_codecserviceregistrant
Plugin Design Considerations
The fuzzer plugin for libmedia_codecserviceregistrant is designed based on the understanding of the library and tries to achieve the following:
Maximize code coverage
The configuration parameters are not hardcoded, but instead selected based on incoming data. This ensures more code paths are reached by the fuzzer.
libmedia_codecserviceregistrant supports the following parameters:
- C2String (parameter name:
c2String) - Width (parameter name:
width) - Height (parameter name:
height) - SamplingRate (parameter name:
samplingRate) - Channels (parameter name:
channels) - Stream (parameter name:
stream)
| Parameter | Valid Values | Configured Value |
|---|---|---|
c2String |
String |
Value obtained from FuzzedDataProvider |
width |
UINT32_MIN to UINT32_MAX |
Value obtained from FuzzedDataProvider |
height |
UINT32_MIN to UINT32_MAX |
Value obtained from FuzzedDataProvider |
samplingRate |
UINT32_MIN to UINT32_MAX |
Value obtained from FuzzedDataProvider |
channels |
UINT32_MIN to UINT32_MAX |
Value obtained from FuzzedDataProvider |
stream |
UINT32_MIN to UINT32_MAX |
Value obtained from FuzzedDataProvider |
This also ensures that the plugin is always deterministic for any given input.
Maximize utilization of input data
The plugin feeds the entire input data to the libmedia_codecserviceregistrant module.
This ensures that the plugin tolerates any kind of input (empty, huge,
malformed, etc) and doesnt exit() on any input and thereby increasing the
chance of identifying vulnerabilities.
Build
This describes steps to build codecServiceRegistrant_fuzzer binary.
Android
Steps to build
Build the fuzzer
$ mm -j$(nproc) codecServiceRegistrant_fuzzer
Steps to run
To run on device
$ adb sync data
$ adb shell /data/fuzz/${TARGET_ARCH}/codecServiceRegistrant_fuzzer/codecServiceRegistrant_fuzzer