android新的版本，packagemanager对app安装有一定的限制，就是除了shell和root用户外，其他用户的进程不允许安装除了系统用户（system ui）以外的app。也就是例如system用户不允许安装uid为7000的app。
所以，如果你想通过一个appupgrade（一个system用户的进程）专门去进行多个不用用户的应用进行差分升级，那么需要去掉此限制。
修改如下：
diff --git a/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerService.java b/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerService.java
index 94f7577..53eea02 100644
--- a/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerService.java
+++ b/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerService.java
@@ -438,7 +438,7 @@ public class PackageInstallerService extends IPackageInstaller.Stub {
throw new SecurityException("User restriction prevents installing");
}
- if ((callingUid == Process.SHELL_UID) || (callingUid == Process.ROOT_UID)) {
-
if ((callingUid == Process.SHELL_UID) || (callingUid == Process.ROOT_UID) || (callingUid == Process.SYSTEM_UID)) {
params.installFlags |= PackageManager.INSTALL_FROM_ADB;} else {@@ -737,7 +737,7 @@ public class PackageInstallerService extends IPackageInstaller.Stub {
IntentSender statusReceiver, int userId) throws RemoteException {
final int callingUid = Binder.getCallingUid();
mPm.enforceCrossUserPermission(callingUid, userId, true, true, "uninstall"); - if ((callingUid != Process.SHELL_UID) && (callingUid != Process.ROOT_UID)) {
- if ((callingUid != Process.SHELL_UID) && (callingUid != Process.ROOT_UID) && (callingUid != Process.SYSTEM_UID)) {
mAppOps.checkPackage(callingUid, callerPackageName);
}
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