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Commit 9d08f19e authored by Edwin Wong's avatar Edwin Wong Committed by Automerger Merge Worker
Browse files

Merge "Fix UAF in clearkey service's MemoryFileSystem" into rvc-dev am: 00b96f0a 

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/13462731

Change-Id: Ibd2266df7dcca56ce17eaa79d774158ff48e3079
parents e203ab79 00b96f0a

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

+1 −1
Original line number Diff line number Diff line
@@ -37,7 +37,7 @@ cc_defaults { 


    relative_install_path: "hw",



    cflags: ["-Wall", "-Werror"],

    cflags: ["-Wall", "-Werror", "-Wthread-safety"],



    shared_libs: [

        "android.hardware.drm@1.0",

drm/mediadrm/plugins/clearkey/hidl/DrmPlugin.cpp

+10 −0
Original line number Diff line number Diff line
@@ -220,6 +220,7 @@ Status_V1_2 DrmPlugin::getKeyRequestCommon(const hidl_vec<uint8_t>& scope, 
        if (requestString.find(kOfflineLicense) != std::string::npos) {

            std::string emptyResponse;

            std::string keySetIdString(keySetId.begin(), keySetId.end());

            Mutex::Autolock lock(mFileHandleLock);

            if (!mFileHandle.StoreLicense(keySetIdString,

                    DeviceFiles::kLicenseStateReleasing,

                    emptyResponse)) {
@@ -335,6 +336,7 @@ bool DrmPlugin::makeKeySetId(std::string* keySetId) { 
        }

        *keySetId = kKeySetIdPrefix + ByteArrayToHexString(

                reinterpret_cast<const uint8_t*>(randomData.data()), randomData.size());

        Mutex::Autolock lock(mFileHandleLock);

        if (mFileHandle.LicenseExists(*keySetId)) {

            // collision, regenerate

            ALOGV("Retry generating KeySetId");
@@ -392,6 +394,7 @@ Return<void> DrmPlugin::provideKeyResponse( 
    if (status == Status::OK) {

        if (isOfflineLicense) {

            if (isRelease) {

                Mutex::Autolock lock(mFileHandleLock);

                mFileHandle.DeleteLicense(keySetId);

                mSessionLibrary->destroySession(session);

            } else {
@@ -400,6 +403,7 @@ Return<void> DrmPlugin::provideKeyResponse( 
                    return Void();

                }



                Mutex::Autolock lock(mFileHandleLock);

                bool ok = mFileHandle.StoreLicense(

                        keySetId,

                        DeviceFiles::kLicenseStateActive,
@@ -454,6 +458,7 @@ Return<Status> DrmPlugin::restoreKeys( 
        DeviceFiles::LicenseState licenseState;

        std::string offlineLicense;

        Status status = Status::OK;

        Mutex::Autolock lock(mFileHandleLock);

        if (!mFileHandle.RetrieveLicense(std::string(keySetId.begin(), keySetId.end()),

                &licenseState, &offlineLicense)) {

            ALOGE("Failed to restore offline license");
@@ -705,6 +710,8 @@ Return<void> DrmPlugin::getMetrics(getMetrics_cb _hidl_cb) { 
}



Return<void> DrmPlugin::getOfflineLicenseKeySetIds(getOfflineLicenseKeySetIds_cb _hidl_cb) {

    Mutex::Autolock lock(mFileHandleLock);



    std::vector<std::string> licenseNames = mFileHandle.ListLicenses();

    std::vector<KeySetId> keySetIds;

    if (mMockError != Status_V1_2::OK) {
@@ -725,6 +732,7 @@ Return<Status> DrmPlugin::removeOfflineLicense(const KeySetId& keySetId) { 
        return toStatus_1_0(mMockError);

    }

    std::string licenseName(keySetId.begin(), keySetId.end());

    Mutex::Autolock lock(mFileHandleLock);

    if (mFileHandle.DeleteLicense(licenseName)) {

        return Status::OK;

    }
@@ -733,6 +741,8 @@ Return<Status> DrmPlugin::removeOfflineLicense(const KeySetId& keySetId) { 


Return<void> DrmPlugin::getOfflineLicenseState(const KeySetId& keySetId,

        getOfflineLicenseState_cb _hidl_cb) {

    Mutex::Autolock lock(mFileHandleLock);



    std::string licenseName(keySetId.begin(), keySetId.end());

    DeviceFiles::LicenseState state;

    std::string license;

drm/mediadrm/plugins/clearkey/hidl/MemoryFileSystem.cpp

+7 −0
Original line number Diff line number Diff line
@@ -24,11 +24,13 @@ std::string MemoryFileSystem::GetFileName(const std::string& path) { 
}



bool MemoryFileSystem::FileExists(const std::string& fileName) const {

    std::lock_guard<std::mutex> lock(mMemoryFileSystemLock);

    auto result = mMemoryFileSystem.find(fileName);

    return result != mMemoryFileSystem.end();

}



ssize_t MemoryFileSystem::GetFileSize(const std::string& fileName) const {

    std::lock_guard<std::mutex> lock(mMemoryFileSystemLock);

    auto result = mMemoryFileSystem.find(fileName);

    if (result != mMemoryFileSystem.end()) {

        return static_cast<ssize_t>(result->second.getFileSize());
@@ -40,6 +42,7 @@ ssize_t MemoryFileSystem::GetFileSize(const std::string& fileName) const { 


std::vector<std::string> MemoryFileSystem::ListFiles() const {

    std::vector<std::string> list;

    std::lock_guard<std::mutex> lock(mMemoryFileSystemLock);

    for (const auto& filename : mMemoryFileSystem) {

        list.push_back(filename.first);

    }
@@ -48,6 +51,7 @@ std::vector<std::string> MemoryFileSystem::ListFiles() const { 


size_t MemoryFileSystem::Read(const std::string& path, std::string* buffer) {

    std::string key = GetFileName(path);

    std::lock_guard<std::mutex> lock(mMemoryFileSystemLock);

    auto result = mMemoryFileSystem.find(key);

    if (result != mMemoryFileSystem.end()) {

        std::string serializedHashFile = result->second.getContent();
@@ -61,6 +65,7 @@ size_t MemoryFileSystem::Read(const std::string& path, std::string* buffer) { 


size_t MemoryFileSystem::Write(const std::string& path, const MemoryFile& memoryFile) {

    std::string key = GetFileName(path);

    std::lock_guard<std::mutex> lock(mMemoryFileSystemLock);

    auto result = mMemoryFileSystem.find(key);

    if (result != mMemoryFileSystem.end()) {

        mMemoryFileSystem.erase(key);
@@ -70,6 +75,7 @@ size_t MemoryFileSystem::Write(const std::string& path, const MemoryFile& memory 
}



bool MemoryFileSystem::RemoveFile(const std::string& fileName) {

    std::lock_guard<std::mutex> lock(mMemoryFileSystemLock);

    auto result = mMemoryFileSystem.find(fileName);

    if (result != mMemoryFileSystem.end()) {

        mMemoryFileSystem.erase(result);
@@ -81,6 +87,7 @@ bool MemoryFileSystem::RemoveFile(const std::string& fileName) { 
}



bool MemoryFileSystem::RemoveAllFiles() {

    std::lock_guard<std::mutex> lock(mMemoryFileSystemLock);

    mMemoryFileSystem.clear();

    return mMemoryFileSystem.empty();

}

drm/mediadrm/plugins/clearkey/hidl/include/DrmPlugin.h

+2 −1
Original line number Diff line number Diff line
@@ -416,7 +416,8 @@ private: 
        mMockError = Status_V1_2::OK;

    }



    DeviceFiles mFileHandle;

    DeviceFiles mFileHandle GUARDED_BY(mFileHandleLock);

    Mutex mFileHandleLock;

    Mutex mSecureStopLock;



    CLEARKEY_DISALLOW_COPY_AND_ASSIGN_AND_NEW(DrmPlugin);

drm/mediadrm/plugins/clearkey/hidl/include/MemoryFileSystem.h

+5 −1
Original line number Diff line number Diff line
@@ -5,7 +5,9 @@ 
#ifndef CLEARKEY_MEMORY_FILE_SYSTEM_H_

#define CLEARKEY_MEMORY_FILE_SYSTEM_H_



#include <android-base/thread_annotations.h>

#include <map>

#include <mutex>

#include <string>



#include "ClearKeyTypes.h"
@@ -49,10 +51,12 @@ class MemoryFileSystem { 
    size_t Write(const std::string& pathName, const MemoryFile& memoryFile);



 private:

    mutable std::mutex mMemoryFileSystemLock;



    // License file name is made up of a unique keySetId, therefore,

    // the filename can be used as the key to locate licenses in the

    // memory file system.

    std::map<std::string, MemoryFile> mMemoryFileSystem;

    std::map<std::string, MemoryFile> mMemoryFileSystem GUARDED_BY(mMemoryFileSystemLock);



    std::string GetFileName(const std::string& path);