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47 lines
1.7 KiB
47 lines
1.7 KiB
4 months ago
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# Fuzzer for libresourcemanagerservice
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## Plugin Design Considerations
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The fuzzer plugin for libresourcemanagerservice is designed based on the
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understanding of the service and tries to achieve the following:
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##### Maximize code coverage
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The configuration parameters are not hardcoded, but instead selected based on
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incoming data. This ensures more code paths are reached by the fuzzer.
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Media Resource Manager supports the following parameters:
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1. Media Resource Type (parameter name: `mediaResourceType`)
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2. Media Resource SubType (parameter name: `mediaResourceSubType`)
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| Parameter| Valid Values| Configured Value|
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|------------- |-------------| ----- |
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| `mediaResourceType` | 0.`MediaResource::kSecureCodec` 1.`MediaResource::kNonSecureCodecC` 2.`MediaResource::kGraphicMemory` 3.`MediaResource::kCpuBoost` 4.`MediaResource::kBattery` 5.`MediaResource::kDrmSession`| Value obtained from FuzzedDataProvider |
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| `mediaResourceSubType` | 0.`MediaResource::kAudioCodec` 1.`MediaResource::kVideoCodec` 2.`MediaResource::kUnspecifiedSubType` | Value obtained from FuzzedDataProvider |
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This also ensures that the plugin is always deterministic for any given input.
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## Build
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This describes steps to build mediaresourcemanager_fuzzer binary.
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### Android
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#### Steps to build
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Build the fuzzer
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```
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$ mm -j$(nproc) mediaresourcemanager_fuzzer
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```
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#### Steps to run
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Create a directory CORPUS_DIR and copy some files to that folder
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Push this directory to device.
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To run on device
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```
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$ adb sync data
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$ adb shell /data/fuzz/arm64/mediaresourcemanager_fuzzer/mediaresourcemanager_fuzzer CORPUS_DIR
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```
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## References:
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* http://llvm.org/docs/LibFuzzer.html
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* https://github.com/google/oss-fuzz
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