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Commit abebfc7e authored by Ayushi Khopkar's avatar Ayushi Khopkar Committed by Kris Alder
Browse files

Added clearkeyV1.4_fuzzer 

Test: ./clearkeyV1.4_fuzzer
Bug: 187131533

Change-Id: I657c07dd2f9eafc8544311567e8e44ca3aca66f2
parent 8f54fbda

drm/mediadrm/plugins/clearkey/hidl/Android.bp

+39 −0
Original line number Diff line number Diff line
@@ -93,6 +93,11 @@ cc_library_static { 
    srcs: ["protos/DeviceFiles.proto"],

}



cc_library {

    name: "libclearkeyhidl",

    defaults: ["clearkey_service_defaults"],

}



cc_binary {

    name: "android.hardware.drm@1.2-service.clearkey",

    defaults: ["clearkey_service_defaults"],
@@ -126,3 +131,37 @@ cc_binary { 
    init_rc: ["android.hardware.drm@1.4-service-lazy.clearkey.rc"],

    vintf_fragments: ["manifest_android.hardware.drm@1.4-service.clearkey.xml"],

}



cc_fuzz {

    name: "clearkeyV1.4_fuzzer",

    vendor: true,

    srcs: [

        "fuzzer/clearkeyV1.4_fuzzer.cpp",

    ],

    static_libs: [

        "libclearkeyhidl",

        "libclearkeycommon",

        "libclearkeydevicefiles-protos",

        "libjsmn",

        "libprotobuf-cpp-lite",

        "libutils",

    ],

    shared_libs: [

        "android.hidl.allocator@1.0",

        "android.hardware.drm@1.0",

        "android.hardware.drm@1.1",

        "android.hardware.drm@1.2",

        "android.hardware.drm@1.3",

        "android.hardware.drm@1.4",

        "libcrypto",

        "libhidlbase",

        "libhidlmemory",

        "liblog",

    ],

    fuzz_config: {

        cc: [

            "android-media-fuzzing-reports@google.com",

        ],

        componentid: 155276,

    },

}

drm/mediadrm/plugins/clearkey/hidl/fuzzer/README.md

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# Fuzzer for android.hardware.drm@1.4-service.clearkey



## Plugin Design Considerations

The fuzzer plugin for android.hardware.drm@1.4-service.clearkey is designed based on the understanding of the

source code 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.



android.hardware.drm@1.4-service.clearkey supports the following parameters:

1. Security Level (parameter name: `securityLevel`)

2. Mime Type (parameter name: `mimeType`)

3. Key Type (parameter name: `keyType`)

4. Crypto Mode (parameter name: `cryptoMode`)



| Parameter| Valid Values| Configured Value|

|------------- |-------------| ----- |

| `securityLevel` | 0.`SecurityLevel::UNKNOWN` 1.`SecurityLevel::SW_SECURE_CRYPTO` 2.`SecurityLevel::SW_SECURE_DECODE` 3.`SecurityLevel::HW_SECURE_CRYPTO`  4.`SecurityLevel::HW_SECURE_DECODE` 5.`SecurityLevel::HW_SECURE_ALL`| Value obtained from FuzzedDataProvider in the range 0 to 5|

| `mimeType` | 0.`video/mp4` 1.`video/mpeg` 2.`video/x-flv` 3.`video/mj2` 4.`video/3gp2` 5.`video/3gpp` 6.`video/3gpp2` 7.`audio/mp4` 8.`audio/mpeg` 9.`audio/aac` 10.`audio/3gp2` 11.`audio/3gpp` 12.`audio/3gpp2` 13.`audio/webm` 14.`video/webm` 15.`webm` 16.`cenc` 17.`video/unknown` 18.`audio/unknown`| Value obtained from FuzzedDataProvider in the range 0 to 18|

| `keyType` | 0.`KeyType::OFFLINE` 1.`KeyType::STREAMING` 2.`KeyType::RELEASE` | Value obtained from FuzzedDataProvider in the range 0 to 2|

| `cryptoMode` | 0.`Mode::UNENCRYPTED` 1.`Mode::AES_CTR` 2.`Mode::AES_CBC_CTS` 3.`Mode::AES_CBC` | Value obtained from FuzzedDataProvider in the range 0 to 3|



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 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 clearkeyV1.4_fuzzer binary.



### Android



#### Steps to build

Build the fuzzer

```

  $ mm -j$(nproc) clearkeyV1.4_fuzzer

```

#### Steps to run

To run on device

```

  $ adb sync data

  $ adb shell /data/fuzz/${TARGET_ARCH}/clearkeyV1.4_fuzzer/vendor/hw/clearkeyV1.4_fuzzer

```



## References:

 * http://llvm.org/docs/LibFuzzer.html

 * https://github.com/google/oss-fuzz

drm/mediadrm/plugins/clearkey/hidl/fuzzer/clearkeyV1.4_fuzzer.cpp

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