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DivestOS/Patches/LineageOS-15.1/android_frameworks_base/347049-backport.patch
Tad b143ffcd8b
15.1 January ASB work 
+ a missing patch from 2019-08

Signed-off-by: Tad <tad@spotco.us>
2023-01-08 16:31:54 -05:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Songchun Fan <schfan@google.com>
Date: Tue, 11 Oct 2022 18:08:11 -0700
Subject: [PATCH] key size limit for mutating settings
Prior to targetSdk 22, apps could add random system settings keys which
opens an opportunity for OOM attacks. This CL adds a key size limit.
BUG: 239415997
Test: manual; will add cts test
Merged-In: Ic9e88c0cc3d7206c64ba5b5c7d15b50d1ffc9adc
Change-Id: Ic9e88c0cc3d7206c64ba5b5c7d15b50d1ffc9adc
(cherry picked from commit 783bcba343c480f6ccedaaff41ba7171a1082e0c)
(cherry picked from commit f1831c87122e56951c04e1f62f647ab156ca71e3)
Merged-In: Ic9e88c0cc3d7206c64ba5b5c7d15b50d1ffc9adc
---
.../providers/settings/SettingsState.java | 40 ++++---
.../providers/settings/SettingsStateTest.java | 102 +++++++++++++++++-
2 files changed, 126 insertions(+), 16 deletions(-)
diff --git a/packages/SettingsProvider/src/com/android/providers/settings/SettingsState.java b/packages/SettingsProvider/src/com/android/providers/settings/SettingsState.java
index 0e94ea85919b..11b4c9eb1c1d 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/SettingsState.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/SettingsState.java
@@ -46,6 +46,7 @@ import android.util.Xml;
import android.util.proto.ProtoOutputStream;
import com.android.internal.annotations.GuardedBy;
+import com.android.internal.annotations.VisibleForTesting;
import com.android.server.LocalServices;
import libcore.io.IoUtils;
@@ -306,8 +307,8 @@ final class SettingsState {
Setting newSetting = new Setting(name, oldSetting.getValue(), null,
oldSetting.getPackageName(), oldSetting.getTag(), false,
oldSetting.getId());
- int newSize = getNewMemoryUsagePerPackageLocked(newSetting.getPackageName(), oldValue,
- newSetting.getValue(), oldDefaultValue, newSetting.getDefaultValue());
+ int newSize = getNewMemoryUsagePerPackageLocked(newSetting.getPackageName(), 0,
+ oldValue, newSetting.getValue(), oldDefaultValue, newSetting.getDefaultValue());
checkNewMemoryUsagePerPackageLocked(newSetting.getPackageName(), newSize);
mSettings.put(name, newSetting);
updateMemoryUsagePerPackageLocked(newSetting.getPackageName(), newSize);
@@ -327,8 +328,9 @@ final class SettingsState {
String oldDefaultValue = (oldState != null) ? oldState.defaultValue : null;
String newDefaultValue = makeDefault ? value : oldDefaultValue;
- int newSize = getNewMemoryUsagePerPackageLocked(packageName, oldValue, value,
- oldDefaultValue, newDefaultValue);
+ int newSize = getNewMemoryUsagePerPackageLocked(packageName,
+ oldValue == null ? name.length() : 0 /* deltaKeySize */,
+ oldValue, value, oldDefaultValue, newDefaultValue);
checkNewMemoryUsagePerPackageLocked(packageName, newSize);
Setting newState;
@@ -365,8 +367,12 @@ final class SettingsState {
}
Setting oldState = mSettings.remove(name);
- int newSize = getNewMemoryUsagePerPackageLocked(oldState.packageName, oldState.value,
- null, oldState.defaultValue, null);
+ if (oldState == null) {
+ return false;
+ }
+ int newSize = getNewMemoryUsagePerPackageLocked(oldState.packageName,
+ -name.length() /* deltaKeySize */,
+ oldState.value, null, oldState.defaultValue, null);
updateMemoryUsagePerPackageLocked(oldState.packageName, newSize);
@@ -384,15 +390,16 @@ final class SettingsState {
}
Setting setting = mSettings.get(name);
+ if (setting == null) {
+ return false;
+ }
Setting oldSetting = new Setting(setting);
String oldValue = setting.getValue();
String oldDefaultValue = setting.getDefaultValue();
- String newValue = oldDefaultValue;
- String newDefaultValue = oldDefaultValue;
- int newSize = getNewMemoryUsagePerPackageLocked(setting.packageName, oldValue,
- newValue, oldDefaultValue, newDefaultValue);
+ int newSize = getNewMemoryUsagePerPackageLocked(setting.packageName, 0, oldValue,
+ oldDefaultValue, oldDefaultValue, oldDefaultValue);
checkNewMemoryUsagePerPackageLocked(setting.packageName, newSize);
if (!setting.reset()) {
@@ -521,8 +528,8 @@ final class SettingsState {
}
@GuardedBy("mLock")
- private int getNewMemoryUsagePerPackageLocked(String packageName, String oldValue,
- String newValue, String oldDefaultValue, String newDefaultValue) {
+ private int getNewMemoryUsagePerPackageLocked(String packageName, int deltaKeySize,
+ String oldValue, String newValue, String oldDefaultValue, String newDefaultValue) {
if (isExemptFromMemoryUsageCap(packageName)) {
return 0;
}
@@ -531,7 +538,7 @@ final class SettingsState {
final int newValueSize = (newValue != null) ? newValue.length() : 0;
final int oldDefaultValueSize = (oldDefaultValue != null) ? oldDefaultValue.length() : 0;
final int newDefaultValueSize = (newDefaultValue != null) ? newDefaultValue.length() : 0;
- final int deltaSize = newValueSize + newDefaultValueSize
+ final int deltaSize = deltaKeySize + newValueSize + newDefaultValueSize
- oldValueSize - oldDefaultValueSize;
return Math.max((currentSize != null) ? currentSize + deltaSize : deltaSize, 0);
}
@@ -1140,4 +1147,11 @@ final class SettingsState {
return false;
}
}
+
+ @VisibleForTesting
+ public int getMemoryUsage(String packageName) {
+ synchronized (mLock) {
+ return mPackageToMemoryUsage.getOrDefault(packageName, 0);
+ }
+ }
}
diff --git a/packages/SettingsProvider/test/src/com/android/providers/settings/SettingsStateTest.java b/packages/SettingsProvider/test/src/com/android/providers/settings/SettingsStateTest.java
index 6f45adef91f7..adb356726eec 100644
--- a/packages/SettingsProvider/test/src/com/android/providers/settings/SettingsStateTest.java
+++ b/packages/SettingsProvider/test/src/com/android/providers/settings/SettingsStateTest.java
@@ -186,8 +186,8 @@ public class SettingsStateTest extends AndroidTestCase {
public void testInsertSetting_memoryUsage() {
final Object lock = new Object();
- final File file = new File(getContext().getCacheDir(), "setting.xml");
- final String settingName = "test_setting";
+ final File file = new File(getContext().getCacheDir(), "setting.xml");
+ final String settingName = "test_setting";
SettingsState settingsState = new SettingsState(getContext(), lock, file, 1,
SettingsState.MAX_BYTES_PER_APP_PACKAGE_UNLIMITED, Looper.getMainLooper());
@@ -204,7 +204,7 @@ public class SettingsStateTest extends AndroidTestCase {
settingsState.deleteSettingLocked(settingName);
// Should not throw if usage is under the cap
- settingsState.insertSettingLocked(settingName, Strings.repeat("A", 19999),
+ settingsState.insertSettingLocked(settingName, Strings.repeat("A", 19975),
null, false, "p1");
settingsState.deleteSettingLocked(settingName);
try {
@@ -222,5 +222,101 @@ public class SettingsStateTest extends AndroidTestCase {
assertTrue(ex.getMessage().contains("p1"));
}
assertTrue(settingsState.getSettingLocked(settingName).isNull());
+ try {
+ settingsState.insertSettingLocked(Strings.repeat("A", 20001), "",
+ null, false, "p1");
+ fail("Should throw because it exceeded per package memory usage");
+ } catch (IllegalStateException ex) {
+ assertTrue(ex.getMessage().contains("You are adding too many system settings"));
+ }
+ }
+
+ public void testMemoryUsagePerPackage() {
+ final Object lock = new Object();
+ final File file = new File(getContext().getCacheDir(), "setting.xml");
+ final String testPackage = "package";
+ SettingsState settingsState = new SettingsState(getContext(), lock, file, 1,
+ SettingsState.MAX_BYTES_PER_APP_PACKAGE_LIMITED, Looper.getMainLooper());
+
+ // Test inserting one key with default
+ final String settingName = "test_setting";
+ final String testKey1 = settingName;
+ final String testValue1 = Strings.repeat("A", 100);
+ settingsState.insertSettingLocked(testKey1, testValue1, null, true, testPackage);
+ int expectedMemUsage = testKey1.length() + testValue1.length()
+ + testValue1.length() /* size for default */;
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+
+ // Test inserting another key
+ final String testKey2 = settingName + "2";
+ settingsState.insertSettingLocked(testKey2, testValue1, null, false, testPackage);
+ expectedMemUsage += testKey2.length() + testValue1.length();
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+
+ // Test updating first key with new default
+ final String testValue2 = Strings.repeat("A", 300);
+ settingsState.insertSettingLocked(testKey1, testValue2, null, true, testPackage);
+ expectedMemUsage += (testValue2.length() - testValue1.length()) * 2;
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+
+ // Test updating first key without new default
+ final String testValue3 = Strings.repeat("A", 50);
+ settingsState.insertSettingLocked(testKey1, testValue3, null, false, testPackage);
+ expectedMemUsage -= testValue2.length() - testValue3.length();
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+
+ // Test updating second key
+ settingsState.insertSettingLocked(testKey2, testValue2, null, false, testPackage);
+ expectedMemUsage -= testValue1.length() - testValue2.length();
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+
+ // Test resetting key
+ settingsState.resetSettingLocked(testKey1);
+ expectedMemUsage += testValue2.length() - testValue3.length();
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+
+ // Test resetting default value
+ settingsState.resetSettingDefaultValueLocked(testKey1);
+ expectedMemUsage -= testValue2.length();
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+
+ // Test deletion
+ settingsState.deleteSettingLocked(testKey2);
+ expectedMemUsage -= testValue2.length() + testKey2.length() /* key is deleted too */;
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+
+ // Test another package with a different key
+ final String testPackage2 = testPackage + "2";
+ final String testKey3 = settingName + "3";
+ settingsState.insertSettingLocked(testKey3, testValue1, null, true, testPackage2);
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+ final int expectedMemUsage2 = testKey3.length() + testValue1.length() * 2;
+ assertEquals(expectedMemUsage2, settingsState.getMemoryUsage(testPackage2));
+
+ // Test system package
+ settingsState.insertSettingLocked(testKey1, testValue1, null, true, "android");
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+ assertEquals(expectedMemUsage2, settingsState.getMemoryUsage(testPackage2));
+ assertEquals(0, settingsState.getMemoryUsage("android"));
+
+ // Test invalid value
+ try {
+ settingsState.insertSettingLocked(testKey1, Strings.repeat("A", 20001), null, false,
+ testPackage);
+ fail("Should throw because it exceeded per package memory usage");
+ } catch (IllegalStateException ex) {
+ assertTrue(ex.getMessage().contains("You are adding too many system settings"));
+ }
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
+
+ // Test invalid key
+ try {
+ settingsState.insertSettingLocked(Strings.repeat("A", 20001), "", null, false,
+ testPackage);
+ fail("Should throw because it exceeded per package memory usage");
+ } catch (IllegalStateException ex) {
+ assertTrue(ex.getMessage().contains("You are adding too many system settings"));
+ }
+ assertEquals(expectedMemUsage, settingsState.getMemoryUsage(testPackage));
}
}
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