diff --git a/media/libmediaplayerservice/tests/DrmSessionManager_test.cpp b/media/libmediaplayerservice/tests/DrmSessionManager_test.cpp
index c81a659..2beb47f 100644
--- a/media/libmediaplayerservice/tests/DrmSessionManager_test.cpp
+++ b/media/libmediaplayerservice/tests/DrmSessionManager_test.cpp
@@ -61,7 +61,11 @@
         return true;
     }
 
-    virtual bool isValidPid(int /* pid */) {
+    virtual bool isPidTrusted(int /* pid */) {
+        return true;
+    }
+
+    virtual bool isPidUidTrusted(int /* pid */, int /* uid */) {
         return true;
     }
 
diff --git a/media/libstagefright/MediaCodec.cpp b/media/libstagefright/MediaCodec.cpp
index 1ea3f99..fffe850 100644
--- a/media/libstagefright/MediaCodec.cpp
+++ b/media/libstagefright/MediaCodec.cpp
@@ -247,7 +247,7 @@
             const std::shared_ptr<IResourceManagerClient> &client);
     virtual ~ResourceManagerServiceProxy();
 
-    void init();
+    status_t init();
 
     // implements DeathRecipient
     static void BinderDiedCallback(void* cookie);
@@ -276,6 +276,9 @@
         pid_t pid, uid_t uid, const std::shared_ptr<IResourceManagerClient> &client)
         : mPid(pid), mUid(uid), mClient(client),
           mDeathRecipient(AIBinder_DeathRecipient_new(BinderDiedCallback)) {
+    if (mUid == MediaCodec::kNoUid) {
+        mUid = AIBinder_getCallingUid();
+    }
     if (mPid == MediaCodec::kNoPid) {
         mPid = AIBinder_getCallingPid();
     }
@@ -294,12 +297,26 @@
     }
 }
 
-void MediaCodec::ResourceManagerServiceProxy::init() {
+status_t MediaCodec::ResourceManagerServiceProxy::init() {
     ::ndk::SpAIBinder binder(AServiceManager_getService("media.resource_manager"));
     mService = IResourceManagerService::fromBinder(binder);
     if (mService == nullptr) {
         ALOGE("Failed to get ResourceManagerService");
-        return;
+        return UNKNOWN_ERROR;
+    }
+
+    int callerPid = AIBinder_getCallingPid();
+    int callerUid = AIBinder_getCallingUid();
+    if (mPid != callerPid || mUid != callerUid) {
+        // Media processes don't need special permissions to act on behalf of other processes.
+        if (callerUid != AID_MEDIA) {
+            char const * permission = "android.permission.MEDIA_RESOURCE_OVERRIDE_PID";
+            if (!checkCallingPermission(String16(permission))) {
+                ALOGW("%s is required to override the caller's PID for media resource management.",
+                        permission);
+                return PERMISSION_DENIED;
+            }
+        }
     }
 
     // Kill clients pending removal.
@@ -310,6 +327,7 @@
 
     // after this, require mLock whenever using mService
     AIBinder_linkToDeath(mService->asBinder().get(), mDeathRecipient.get(), this);
+    return OK;
 }
 
 //static
@@ -773,12 +791,7 @@
       mInputBufferCounter(0),
       mGetCodecBase(getCodecBase),
       mGetCodecInfo(getCodecInfo) {
-    if (uid == kNoUid) {
-        mUid = AIBinder_getCallingUid();
-    } else {
-        mUid = uid;
-    }
-    mResourceManagerProxy = new ResourceManagerServiceProxy(pid, mUid,
+    mResourceManagerProxy = new ResourceManagerServiceProxy(pid, uid,
             ::ndk::SharedRefBase::make<ResourceManagerClient>(this));
     if (!mGetCodecBase) {
         mGetCodecBase = [](const AString &name, const char *owner) {
@@ -807,7 +820,6 @@
             return NAME_NOT_FOUND;
         };
     }
-
     initMediametrics();
 }
 
@@ -1363,7 +1375,11 @@
 }
 
 status_t MediaCodec::init(const AString &name) {
-    mResourceManagerProxy->init();
+    status_t err = mResourceManagerProxy->init();
+    if (err != OK) {
+        mCodec = NULL; // remove the codec
+        return err;
+    }
 
     // save init parameters for reset
     mInitName = name;
@@ -1378,7 +1394,7 @@
     bool secureCodec = false;
     const char *owner = "";
     if (!name.startsWith("android.filter.")) {
-        status_t err = mGetCodecInfo(name, &mCodecInfo);
+        err = mGetCodecInfo(name, &mCodecInfo);
         if (err != OK) {
             mCodec = NULL;  // remove the codec.
             return err;
@@ -1446,7 +1462,6 @@
         mBatteryChecker = new BatteryChecker(new AMessage(kWhatCheckBatteryStats, this));
     }
 
-    status_t err;
     std::vector<MediaResourceParcel> resources;
     resources.push_back(MediaResource::CodecResource(secureCodec, mIsVideo));
     for (int i = 0; i <= kMaxRetry; ++i) {
@@ -4599,7 +4614,6 @@
     mCSD.erase(mCSD.begin());
     std::shared_ptr<C2Buffer> c2Buffer;
     sp<hardware::HidlMemory> memory;
-    size_t offset = 0;
 
     if (mFlags & kFlagUseBlockModel) {
         if (hasCryptoOrDescrambler()) {
@@ -4620,7 +4634,6 @@
             memcpy(mem->unsecurePointer(), csd->data(), csd->size());
             ssize_t heapOffset;
             memory = hardware::fromHeap(mem->getMemory(&heapOffset, nullptr));
-            offset += heapOffset;
         } else {
             std::shared_ptr<C2LinearBlock> block =
                 FetchLinearBlock(csd->size(), {std::string{mComponentName.c_str()}});
diff --git a/media/libstagefright/include/media/stagefright/MediaCodec.h b/media/libstagefright/include/media/stagefright/MediaCodec.h
index d372140..34fb0d8 100644
--- a/media/libstagefright/include/media/stagefright/MediaCodec.h
+++ b/media/libstagefright/include/media/stagefright/MediaCodec.h
@@ -401,7 +401,6 @@
     struct ResourceManagerServiceProxy;
 
     State mState;
-    uid_t mUid;
     bool mReleasedByResourceManager;
     sp<ALooper> mLooper;
     sp<ALooper> mCodecLooper;
diff --git a/media/libstagefright/include/media/stagefright/ProcessInfo.h b/media/libstagefright/include/media/stagefright/ProcessInfo.h
index b8a3c10..06b9c92 100644
--- a/media/libstagefright/include/media/stagefright/ProcessInfo.h
+++ b/media/libstagefright/include/media/stagefright/ProcessInfo.h
@@ -30,7 +30,8 @@
     ProcessInfo();
 
     virtual bool getPriority(int pid, int* priority);
-    virtual bool isValidPid(int pid);
+    virtual bool isPidTrusted(int pid);
+    virtual bool isPidUidTrusted(int pid, int uid);
     virtual bool overrideProcessInfo(int pid, int procState, int oomScore);
     virtual void removeProcessInfoOverride(int pid);
 
diff --git a/media/libstagefright/include/media/stagefright/ProcessInfoInterface.h b/media/libstagefright/include/media/stagefright/ProcessInfoInterface.h
index 9260181..b7fc858 100644
--- a/media/libstagefright/include/media/stagefright/ProcessInfoInterface.h
+++ b/media/libstagefright/include/media/stagefright/ProcessInfoInterface.h
@@ -23,7 +23,8 @@
 
 struct ProcessInfoInterface : public RefBase {
     virtual bool getPriority(int pid, int* priority) = 0;
-    virtual bool isValidPid(int pid) = 0;
+    virtual bool isPidTrusted(int pid) = 0;
+    virtual bool isPidUidTrusted(int pid, int uid) = 0;
     virtual bool overrideProcessInfo(int pid, int procState, int oomScore);
     virtual void removeProcessInfoOverride(int pid);
 
diff --git a/media/utils/ProcessInfo.cpp b/media/utils/ProcessInfo.cpp
index e212794..da199c4 100644
--- a/media/utils/ProcessInfo.cpp
+++ b/media/utils/ProcessInfo.cpp
@@ -64,11 +64,27 @@
     return true;
 }
 
-bool ProcessInfo::isValidPid(int pid) {
+bool ProcessInfo::isPidTrusted(int pid) {
+    return isPidUidTrusted(pid, -1);
+}
+
+bool ProcessInfo::isPidUidTrusted(int pid, int uid) {
     int callingPid = IPCThreadState::self()->getCallingPid();
     int callingUid = IPCThreadState::self()->getCallingUid();
-    // Trust it if this is called from the same process otherwise pid has to match the calling pid.
-    return (callingPid == getpid()) || (callingPid == pid) || (callingUid == AID_MEDIA);
+    // Always trust when the caller is acting on their own behalf.
+    if (pid == callingPid && (uid == callingUid || uid == -1)) { // UID can be optional
+        return true;
+    }
+    // Implicitly trust when the caller is our own process.
+    if (callingPid == getpid()) {
+        return true;
+    }
+    // Implicitly trust when a media process is calling.
+    if (callingUid == AID_MEDIA) {
+        return true;
+    }
+    // Otherwise, allow the caller to act as another process when the caller has permissions.
+    return checkCallingPermission(String16("android.permission.MEDIA_RESOURCE_OVERRIDE_PID"));
 }
 
 bool ProcessInfo::overrideProcessInfo(int pid, int procState, int oomScore) {
diff --git a/services/mediaresourcemanager/ResourceManagerService.cpp b/services/mediaresourcemanager/ResourceManagerService.cpp
index 953686b..d31baa3 100644
--- a/services/mediaresourcemanager/ResourceManagerService.cpp
+++ b/services/mediaresourcemanager/ResourceManagerService.cpp
@@ -422,11 +422,11 @@
     mServiceLog->add(log);
 
     Mutex::Autolock lock(mLock);
-    if (!mProcessInfo->isValidPid(pid)) {
+    if (!mProcessInfo->isPidUidTrusted(pid, uid)) {
         pid_t callingPid = IPCThreadState::self()->getCallingPid();
         uid_t callingUid = IPCThreadState::self()->getCallingUid();
-        ALOGW("%s called with untrusted pid %d, using calling pid %d, uid %d", __FUNCTION__,
-                pid, callingPid, callingUid);
+        ALOGW("%s called with untrusted pid %d or uid %d, using calling pid %d, uid %d",
+                __FUNCTION__, pid, uid, callingPid, callingUid);
         pid = callingPid;
         uid = callingUid;
     }
@@ -481,7 +481,7 @@
     mServiceLog->add(log);
 
     Mutex::Autolock lock(mLock);
-    if (!mProcessInfo->isValidPid(pid)) {
+    if (!mProcessInfo->isPidTrusted(pid)) {
         pid_t callingPid = IPCThreadState::self()->getCallingPid();
         ALOGW("%s called with untrusted pid %d, using calling pid %d", __FUNCTION__,
                 pid, callingPid);
@@ -549,7 +549,7 @@
     mServiceLog->add(log);
 
     Mutex::Autolock lock(mLock);
-    if (checkValid && !mProcessInfo->isValidPid(pid)) {
+    if (checkValid && !mProcessInfo->isPidTrusted(pid)) {
         pid_t callingPid = IPCThreadState::self()->getCallingPid();
         ALOGW("%s called with untrusted pid %d, using calling pid %d", __FUNCTION__,
                 pid, callingPid);
@@ -607,7 +607,7 @@
     Vector<std::shared_ptr<IResourceManagerClient>> clients;
     {
         Mutex::Autolock lock(mLock);
-        if (!mProcessInfo->isValidPid(callingPid)) {
+        if (!mProcessInfo->isPidTrusted(callingPid)) {
             pid_t actualCallingPid = IPCThreadState::self()->getCallingPid();
             ALOGW("%s called with untrusted pid %d, using actual calling pid %d", __FUNCTION__,
                     callingPid, actualCallingPid);
@@ -846,7 +846,7 @@
     mServiceLog->add(log);
 
     Mutex::Autolock lock(mLock);
-    if (!mProcessInfo->isValidPid(pid)) {
+    if (!mProcessInfo->isPidTrusted(pid)) {
         pid_t callingPid = IPCThreadState::self()->getCallingPid();
         ALOGW("%s called with untrusted pid %d, using calling pid %d", __FUNCTION__,
                 pid, callingPid);
@@ -878,7 +878,7 @@
     Vector<std::shared_ptr<IResourceManagerClient>> clients;
     {
         Mutex::Autolock lock(mLock);
-        if (!mProcessInfo->isValidPid(pid)) {
+        if (!mProcessInfo->isPidTrusted(pid)) {
             pid_t callingPid = IPCThreadState::self()->getCallingPid();
             ALOGW("%s called with untrusted pid %d, using calling pid %d", __FUNCTION__,
                     pid, callingPid);
diff --git a/services/mediaresourcemanager/fuzzer/mediaresourcemanager_fuzzer.cpp b/services/mediaresourcemanager/fuzzer/mediaresourcemanager_fuzzer.cpp
index 6690b16..8f25ee6 100644
--- a/services/mediaresourcemanager/fuzzer/mediaresourcemanager_fuzzer.cpp
+++ b/services/mediaresourcemanager/fuzzer/mediaresourcemanager_fuzzer.cpp
@@ -71,7 +71,8 @@
         return true;
     }
 
-    virtual bool isValidPid(int /* pid */) { return true; }
+    virtual bool isPidTrusted(int /* pid */) { return true; }
+    virtual bool isPidUidTrusted(int /* pid */, int /* uid */) { return true; }
     virtual bool overrideProcessInfo(int /* pid */, int /*procState*/, int /*oomScore*/) {
         return true;
     }
diff --git a/services/mediaresourcemanager/test/ResourceManagerServiceTestUtils.h b/services/mediaresourcemanager/test/ResourceManagerServiceTestUtils.h
index 8e29312..0aa55c9 100644
--- a/services/mediaresourcemanager/test/ResourceManagerServiceTestUtils.h
+++ b/services/mediaresourcemanager/test/ResourceManagerServiceTestUtils.h
@@ -46,7 +46,11 @@
         return true;
     }
 
-    virtual bool isValidPid(int /* pid */) {
+    virtual bool isPidTrusted(int /* pid */) {
+        return true;
+    }
+
+    virtual bool isPidUidTrusted(int /* pid */, int /* uid */) {
         return true;
     }