add per-app setting for hiding carrier/network information

core/java/android/app/ActivityThreadHooks.java

@@ -4,6 +4,7 @@
 import android.content.Context;
 import android.content.pm.GosPackageState;
 import android.content.pm.SrtPermissions;
+import android.ext.carrierinfo.HideCarrierInfo;
 import android.ext.dcl.DynCodeLoading;
 import android.location.HookedLocationManager;
 import android.os.Bundle;
@@ -42,6 +43,8 @@ static Bundle onBind(Context appContext, ActivityThread.AppBindData appBindData)
 
         DynCodeLoading.handleAppBindFlags(flags[AppBindArgs.FLAGS_IDX_DYN_CODE_LOADING]);
 
+        HideCarrierInfo.handleAppBindFlags(flags[AppBindArgs.FLAGS_IDX_HIDE_CARRIER_INFO]);
+
         return args;
     }
 
@@ -59,6 +62,7 @@ static void onGosPackageStateChanged(Context ctx, GosPackageState state, boolean
         if (!Process.isIsolated()) {
             StorageScopesAppHooks.maybeEnable(state);
             ContactScopes.maybeEnable(ctx, state);
+            HideCarrierInfo.onGosPackageStateChanged(ctx, state);
         }
     }
 

core/java/android/app/AppBindArgs.java

@@ -8,6 +8,7 @@ public interface AppBindArgs {
     int FLAGS_IDX_SPECIAL_RUNTIME_PERMISSIONS = 0;
     int FLAGS_IDX_HOOKED_LOCATION_MANAGER = 1;
     int FLAGS_IDX_DYN_CODE_LOADING = 2;
+    int FLAGS_IDX_HIDE_CARRIER_INFO = 3;
 
     int FLAGS_ARRAY_LEN = 10;
 }

core/java/android/app/IActivityManager.aidl

@@ -1061,4 +1061,7 @@ interface IActivityManager {
      */
     oneway void reportOptimizationInfo(in IBinder app, in String compilerFilter,
             in String compilationReason);
+
+
+    boolean shouldHideCarrierInfoForUid(int targetUid, String apiName);
 }

core/java/android/content/pm/GosPackageStateFlag.java

@@ -36,6 +36,9 @@ public interface GosPackageStateFlag {
     /** @hide */ int PLAY_INTEGRITY_API_USED_AT_LEAST_ONCE = 26;
     /** @hide */ int SUPPRESS_PLAY_INTEGRITY_API_NOTIF = 27;
     /** @hide */ int BLOCK_PLAY_INTEGRITY_API = 28;
+    // flag 29 was used mic spoofing feature (not merged yet)
+    /** @hide */ int HIDE_CARRIER_INFO_NON_DEFAULT = 30;
+    /** @hide */ int HIDE_CARRIER_INFO = 31;
 
     /** @hide */
     @IntDef(value = {
@@ -64,6 +67,8 @@ public interface GosPackageStateFlag {
             PLAY_INTEGRITY_API_USED_AT_LEAST_ONCE,
             SUPPRESS_PLAY_INTEGRITY_API_NOTIF,
             BLOCK_PLAY_INTEGRITY_API,
+            HIDE_CARRIER_INFO_NON_DEFAULT,
+            HIDE_CARRIER_INFO,
     })
     @Retention(RetentionPolicy.SOURCE)
     @interface Enum {}

core/java/android/ext/SettingsIntents.java

@@ -13,6 +13,7 @@ public class SettingsIntents {
     public static final String APP_MEMORY_DYN_CODE_LOADING = "android.settings.OPEN_APP_MEMORY_DYN_CODE_LOADING_SETTINGS";
     public static final String APP_STORAGE_DYN_CODE_LOADING = "android.settings.OPEN_APP_STORAGE_DYN_CODE_LOADING_SETTINGS";
     public static final String APP_MANAGE_PLAY_INTEGRITY_API = "android.settings.OPEN_APP_MANAGE_PLAY_INTEGRITY_API_SETTINGS";
+    public static final String APP_HIDE_CARRIER_INFO = "android.settings.OPEN_APP_HIDE_CARRIER_INFO_SETTINGS";
 
     public static Intent getAppIntent(Context ctx, String action, String pkgName) {
         var i = new Intent(action);

core/java/android/ext/carrierinfo/HideCarrierInfo.java

@@ -0,0 +1,47 @@
+package android.ext.carrierinfo;
+
+import android.app.AppGlobals;
+import android.app.Application;
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.GosPackageState;
+import android.ext.settings.app.AswHideCarrierInfo;
+import android.os.UserHandle;
+
+/** @hide */
+public class HideCarrierInfo {
+    /** @hide */
+    public static final int FLAG_HIDE_CARRIER_INFO = 1;
+
+    private static volatile int flags;
+
+    /** @hide */
+    public static int getAppBindFlags(Context ctx, int userId, ApplicationInfo appInfo,
+                                      GosPackageState gosPs) {
+        if (AswHideCarrierInfo.I.get(ctx, userId, appInfo, gosPs)) {
+            return FLAG_HIDE_CARRIER_INFO;
+        }
+        return 0;
+    }
+
+    /** @hide */
+    public static void handleAppBindFlags(int v) {
+        flags = v;
+    }
+
+    /** @hide */
+    public static void onGosPackageStateChanged(Context ctx, GosPackageState gosPs) {
+        Application app = AppGlobals.getInitialApplication();
+        if (app == null) {
+            return;
+        }
+        flags = getAppBindFlags(ctx, UserHandle.myUserId(), app.getApplicationInfo(), gosPs);
+    }
+
+    /** @hide */
+    public static boolean isEnabled() {
+        return (flags & FLAG_HIDE_CARRIER_INFO) != 0;
+    }
+
+    private HideCarrierInfo() {}
+}

core/java/android/ext/settings/ExtSettings.java

@@ -100,6 +100,10 @@ public class ExtSettings {
     public static final BoolSetting DISALLOW_DELAYED_LOCKING_ON_USER_STOP = new BoolSetting(
             Setting.Scope.PER_USER, Settings.Secure.DISALLOW_DELAYED_LOCKING_ON_USER_STOP, false);
 
+    public static final BoolSetting HIDE_CARRIER_INFO_BY_DEFAULT = new BoolSetting(
+            Setting.Scope.GLOBAL, Settings.Global.HIDE_CARRIER_INFO_BY_DEFAULT,
+            defaultBool(R.bool.setting_default_hide_carrier_info));
+
     private ExtSettings() {}
 
     public static Function<Context, Boolean> defaultBool(@BoolRes int res) {

core/java/android/ext/settings/app/AswHideCarrierInfo.java

@@ -0,0 +1,34 @@
+package android.ext.settings.app;
+
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.GosPackageState;
+import android.content.pm.GosPackageStateFlag;
+import android.ext.settings.ExtSettings;
+
+/** @hide */
+public class AswHideCarrierInfo extends AppSwitch {
+    public static final AswHideCarrierInfo I = new AswHideCarrierInfo();
+
+    private AswHideCarrierInfo() {
+        gosPsFlagNonDefault = GosPackageStateFlag.HIDE_CARRIER_INFO_NON_DEFAULT;
+        gosPsFlag = GosPackageStateFlag.HIDE_CARRIER_INFO;
+    }
+
+    @Override
+    public Boolean getImmutableValue(Context ctx, int userId, ApplicationInfo appInfo,
+                                     GosPackageState ps, StateInfo si) {
+        if (appInfo.isSystemApp()) {
+            si.immutabilityReason = IR_IS_SYSTEM_APP;
+            return false;
+        }
+        return null;
+    }
+
+    @Override
+    protected boolean getDefaultValueInner(Context ctx, int userId, ApplicationInfo appInfo,
+            GosPackageState ps, StateInfo si) {
+        si.defaultValueReason = DVR_DEFAULT_SETTING;
+        return ExtSettings.HIDE_CARRIER_INFO_BY_DEFAULT.get(ctx, userId);
+    }
+}

core/java/android/provider/Settings.java

@@ -14085,6 +14085,10 @@ public static final class Global extends NameValueTable {
                 KnownSystemPackage.SETUP_WIZARD})
         public static final String GEOCODER = "geocoder";
 
+        /** @hide */
+        @Protected(readWrite = KnownSystemPackage.SETTINGS)
+        public static final String HIDE_CARRIER_INFO_BY_DEFAULT = "hide_carrier_info";
+
         // ExtSettings END
 
         // NOTE: If you add new settings here, be sure to add them to

core/java/com/android/internal/os/ZygoteExtraArgs.java

@@ -4,6 +4,7 @@
 import android.content.Context;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.GosPackageState;
+import android.ext.settings.app.AswHideCarrierInfo;
 
 // Extra args for:
 // - children of main zygote{,64}, including AppZygotes, but excluding WebViewZygote
@@ -13,17 +14,20 @@
 // (see android.app.ZygotePreload).
 public class ZygoteExtraArgs {
     public final long selinuxFlags;
+    public final boolean bindMountExtendedSyspropOverrides;
 
     public static final String PREFIX = "--flat-extra-args=";
 
-    public static final ZygoteExtraArgs DEFAULT = new ZygoteExtraArgs(0L);
+    public static final ZygoteExtraArgs DEFAULT = new ZygoteExtraArgs(0L, false);
 
-    public ZygoteExtraArgs(long selinuxFlags) {
+    public ZygoteExtraArgs(long selinuxFlags, boolean bindMountExtendedSyspropOverrides) {
         this.selinuxFlags = selinuxFlags;
+        this.bindMountExtendedSyspropOverrides = bindMountExtendedSyspropOverrides;
     }
 
     private static final int IDX_SELINUX_FLAGS = 0;
-    private static final int ARR_LEN = 1;
+    private static final int IDX_BIND_MOUNT_EXTENDED_SYSPROP_OVERRIDES = 1;
+    private static final int ARR_LEN = 2;
     private static final String SEPARATOR = "\t";
 
     public static String createFlat(Context ctx, int userId, ApplicationInfo appInfo,
@@ -33,6 +37,8 @@ public static String createFlat(Context ctx, int userId, ApplicationInfo appInfo
         arr[IDX_SELINUX_FLAGS] = Long.toHexString(
             SELinuxFlags.get(ctx, userId, appInfo, ps, isIsolatedProcess)
         );
+        arr[IDX_BIND_MOUNT_EXTENDED_SYSPROP_OVERRIDES] =
+                AswHideCarrierInfo.I.get(ctx, userId, appInfo, ps) ? "1" : "0";
         return PREFIX + String.join(SEPARATOR, arr);
     }
 
@@ -42,19 +48,24 @@ public static String createFlatForWebviewProcess(Context ctx, int userId,
         arr[IDX_SELINUX_FLAGS] = Long.toHexString(
             SELinuxFlags.getForWebViewProcess(ctx, userId, callerAppInfo, callerPs)
         );
+        arr[IDX_BIND_MOUNT_EXTENDED_SYSPROP_OVERRIDES] = "0";
         return PREFIX + String.join(SEPARATOR, arr);
     }
 
     static ZygoteExtraArgs parse(String flat) {
         String[] arr = flat.split(SEPARATOR);
         long selinuxFlags = Long.parseLong(arr[IDX_SELINUX_FLAGS], 16);
-        return new ZygoteExtraArgs(selinuxFlags);
+        boolean bindMountExtendedSyspropOverrides =
+                arr.length > IDX_BIND_MOUNT_EXTENDED_SYSPROP_OVERRIDES
+                && "1".equals(arr[IDX_BIND_MOUNT_EXTENDED_SYSPROP_OVERRIDES]);
+        return new ZygoteExtraArgs(selinuxFlags, bindMountExtendedSyspropOverrides);
     }
 
     // keep in sync with ExtraArgs struct in core/jni/com_android_internal_os_Zygote.cpp
     public long[] makeJniLongArray() {
         long[] res = new long[ARR_LEN];
         res[IDX_SELINUX_FLAGS] = selinuxFlags;
+        res[IDX_BIND_MOUNT_EXTENDED_SYSPROP_OVERRIDES] = bindMountExtendedSyspropOverrides ? 1L : 0L;
         return res;
     }
 }

core/jni/com_android_internal_os_Zygote.cpp

@@ -358,14 +358,16 @@ enum RuntimeFlags : uint32_t {
 
 struct ExtraArgs {
     uint64_t selinux_flags = 0;
+    bool bind_mount_extended_sysprop_overrides = false;
 
     ExtraArgs() {}
 
     ExtraArgs(JNIEnv* env, jlongArray jlongArgs) {
-        const size_t num_jlong_args = 1;
+        const size_t num_jlong_args = 2;
         jlong jlong_arr[num_jlong_args];
         env->GetLongArrayRegion(jlongArgs, 0, num_jlong_args, (jlong *) &jlong_arr);
         selinux_flags = (uint64_t) jlong_arr[0];
+        bind_mount_extended_sysprop_overrides = (jlong_arr[1] != 0);
     }
 };
 
@@ -1763,6 +1765,20 @@ static void BindMountSyspropOverride(fail_fn_t fail_fn, JNIEnv* env) {
   // ReloadBuildJavaConstants(env);
 }
 
+static void BindMountExtendedSyspropOverride(fail_fn_t fail_fn, JNIEnv* env) {
+    std::string source = "/dev/__properties__/extended_override";
+    std::string target = "/dev/__properties__";
+    if (access(source.c_str(), F_OK) != 0) {
+      return;
+    }
+    if (access(target.c_str(), F_OK) != 0) {
+        return;
+    }
+    BindMount(source, target, fail_fn);
+    __system_properties_zygote_reload();
+    // see the TODO above BindMountSyspropOverride
+}
+
 static void BindMountStorageToLowerFs(const userid_t user_id, const uid_t uid,
     const char* dir_name, const char* package, fail_fn_t fail_fn) {
     bool hasSdcardFs = IsSdcardfsUsed();
@@ -1987,7 +2003,9 @@ static void SpecializeCommon(JNIEnv* env, uid_t uid, gid_t gid, jintArray gids,
                              fail_fn);
     }
 
-    if (mount_sysprop_overrides) {
+    if (extra_args.bind_mount_extended_sysprop_overrides) {
+        BindMountExtendedSyspropOverride(fail_fn, env);
+    } else if (mount_sysprop_overrides) {
         BindMountSyspropOverride(fail_fn, env);
     }
 

core/res/res/values/config_ext.xml

@@ -51,4 +51,8 @@
     </string-array>
     <java-symbol type="array" name="read_additional_security_state_known_signers" />
 
+
+    <bool name="setting_default_hide_carrier_info">false</bool>
+    <java-symbol type="bool" name="setting_default_hide_carrier_info" />
+
 </resources>

core/res/res/values/string_ext.xml

@@ -49,6 +49,7 @@
     <string name="notif_storage_dcl_title">%1$s tried to perform DCL via storage</string>
     <java-symbol type="string" name="notif_storage_dcl_title" />
 
+
     <string name="usb_port_security_error_title">USB-C port security feature has malfunctioned</string>
     <java-symbol type="string" name="usb_port_security_error_title" />