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Commit 63da1c7c authored by Rubin Xu's avatar Rubin Xu
Browse files

Force a garbage collection after lockscreen verification 

This is to attempt erasing any lockscreen password remnants from memory,
which is a NIAP certification requirement.

Bug: 142861621
Test: reboot device, enter lockscreen password, then use pmdump to dump
process memory for SystemUi, verify password does not exist in the dump.

Merged-In: Ifbec81a64e4c592b566f5653bd93fd7326693ec7
Change-Id: Ifbec81a64e4c592b566f5653bd93fd7326693ec7
(cherry picked from commit 20aa6cd4)
parent 903cd4ce

packages/SystemUI/src/com/android/keyguard/KeyguardSecurityContainer.java

+10 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ import com.android.internal.logging.MetricsLogger; 
import com.android.internal.logging.nano.MetricsProto.MetricsEvent;

import com.android.internal.widget.LockPatternUtils;

import com.android.keyguard.KeyguardSecurityModel.SecurityMode;

import com.android.settingslib.utils.ThreadUtils;

import com.android.systemui.Dependency;

import com.android.systemui.R;

import com.android.systemui.SystemUIFactory;
@@ -615,6 +616,15 @@ public class KeyguardSecurityContainer extends FrameLayout implements KeyguardSe 
                StatsLog.write(StatsLog.KEYGUARD_BOUNCER_PASSWORD_ENTERED,

                    StatsLog.KEYGUARD_BOUNCER_PASSWORD_ENTERED__RESULT__SUCCESS);

                mLockPatternUtils.reportSuccessfulPasswordAttempt(userId);

                // Force a garbage collection in an attempt to erase any lockscreen password left in

                // memory. Do it asynchronously with a 5-sec delay to avoid making the keyguard

                // dismiss animation janky.

                ThreadUtils.postOnBackgroundThread(() -> {

                    try {

                        Thread.sleep(5000);

                    } catch (InterruptedException ignored) { }

                    Runtime.getRuntime().gc();

                });

            } else {

                StatsLog.write(StatsLog.KEYGUARD_BOUNCER_PASSWORD_ENTERED,

                    StatsLog.KEYGUARD_BOUNCER_PASSWORD_ENTERED__RESULT__FAILURE);