From 3ec9c56bd4ac40cf11f00866639b37a955eabc8b Mon Sep 17 00:00:00 2001 From: Jing Ji Date: Tue, 25 Oct 2022 22:39:52 -0700 Subject: [PATCH] DO NOT MERGE: ActivityManager#killBackgroundProcesses can kill caller's own app only unless it's a system app. Bug: 239423414 Bug: 223376078 Test: atest CtsAppTestCases:ActivityManagerTest (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:d1c95670b248df945784b0f2830acf83b5682de3) Merged-In: Iac6baa889965b8ffecd9a43179a4c96632ad1d02 AOSP-Change-Id: Iac6baa889965b8ffecd9a43179a4c96632ad1d02 Change-Id: I3a39b5e2b2ff0c314972ddeccb012894de704de8 --- .../server/am/ActivityManagerService.java | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java index 41b1ddaf887bb..bcb7276b4014e 100644 --- a/services/core/java/com/android/server/am/ActivityManagerService.java +++ b/services/core/java/com/android/server/am/ActivityManagerService.java @@ -4268,6 +4268,22 @@ void killAllBackgroundProcessesExcept(int minTargetSdk, int maxProcState) { throw new SecurityException(msg); } + final int callingUid = Binder.getCallingUid(); + final int callingPid = Binder.getCallingPid(); + + ProcessRecord proc; + synchronized (mPidsSelfLocked) { + proc = mPidsSelfLocked.get(callingPid); + } + if (callingUid >= FIRST_APPLICATION_UID + && (proc == null || !proc.info.isSystemApp())) { + final String msg = "Permission Denial: killAllBackgroundProcesses() from pid=" + + callingPid + ", uid=" + callingUid + " is not allowed"; + Slog.w(TAG, msg); + // Silently return to avoid existing apps from crashing. + return; + } + final long callingId = Binder.clearCallingIdentity(); try { synchronized (this) {