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Merge "Don't call the Package Manager when holding the settings lock" into oc-dev

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am: 781fdfaf5b

Change-Id: Iec1e4b48ce9191e6b2f2ae56e144518698e51f3d
This commit is contained in:
Christopher Tate
2017-04-06 01:59:27 +00:00
committed by android-build-merger
parent 3755323a9d 781fdfaf5b
commit 36d12d4408
1 changed files with 34 additions and 22 deletions
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56
packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
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@@ -994,6 +994,15 @@ public class SettingsProvider extends ContentProvider {
return false;
}
private PackageInfo getCallingPackageInfo(int userId) {
try {
return mPackageManager.getPackageInfo(getCallingPackage(),
PackageManager.GET_SIGNATURES, userId);
} catch (RemoteException e) {
throw new IllegalStateException("Package " + getCallingPackage() + " doesn't exist");
}
}
private Cursor getAllSecureSettings(int userId, String[] projection) {
if (DEBUG) {
Slog.v(LOG_TAG, "getAllSecureSettings(" + userId + ")");
@@ -1002,6 +1011,13 @@ public class SettingsProvider extends ContentProvider {
// Resolve the userId on whose behalf the call is made.
final int callingUserId = resolveCallingUserIdEnforcingPermissionsLocked(userId);
// The relevant "calling package" userId will be the owning userId for some
// profiles, and we can't do the lookup inside our [lock held] loop, so work out
// up front who the effective "new SSAID" user ID for that settings name will be.
final int ssaidUserId = resolveOwningUserIdForSecureSettingLocked(callingUserId,
Settings.Secure.ANDROID_ID);
final PackageInfo ssaidCallingPkg = getCallingPackageInfo(ssaidUserId);
synchronized (mLock) {
List<String> names = getSettingsNamesLocked(SETTINGS_TYPE_SECURE, callingUserId);
@@ -1026,7 +1042,7 @@ public class SettingsProvider extends ContentProvider {
// SETTINGS_FILE_SSAID, unless accessed by a system process.
final Setting setting;
if (isNewSsaidSetting(name)) {
setting = getSsaidSettingLocked(owningUserId);
setting = getSsaidSettingLocked(ssaidCallingPkg, owningUserId);
} else {
setting = mSettingsRegistry.getSettingLocked(SETTINGS_TYPE_SECURE, owningUserId,
name);
@@ -1060,14 +1076,17 @@ public class SettingsProvider extends ContentProvider {
return settings != null ? settings.getNullSetting() : null;
}
// Get the value.
synchronized (mLock) {
// As of Android O, the SSAID is read from an app-specific entry in table
// SETTINGS_FILE_SSAID, unless accessed by a system process.
if (isNewSsaidSetting(name)) {
return getSsaidSettingLocked(owningUserId);
// As of Android O, the SSAID is read from an app-specific entry in table
// SETTINGS_FILE_SSAID, unless accessed by a system process.
if (isNewSsaidSetting(name)) {
PackageInfo callingPkg = getCallingPackageInfo(owningUserId);
synchronized (mLock) {
return getSsaidSettingLocked(callingPkg, owningUserId);
}
}
// Not the SSAID; do a straight lookup
synchronized (mLock) {
return mSettingsRegistry.getSettingLocked(SETTINGS_TYPE_SECURE,
owningUserId, name);
}
@@ -1078,7 +1097,7 @@ public class SettingsProvider extends ContentProvider {
&& UserHandle.getAppId(Binder.getCallingUid()) >= Process.FIRST_APPLICATION_UID;
}
private Setting getSsaidSettingLocked(int owningUserId) {
private Setting getSsaidSettingLocked(PackageInfo callingPkg, int owningUserId) {
// Get uid of caller (key) used to store ssaid value
String name = Integer.toString(
UserHandle.getUid(owningUserId, UserHandle.getAppId(Binder.getCallingUid())));
@@ -1093,7 +1112,7 @@ public class SettingsProvider extends ContentProvider {
// Lazy initialize ssaid if not yet present in ssaid table.
if (ssaid == null || ssaid.isNull() || ssaid.getValue() == null) {
return mSettingsRegistry.generateSsaidLocked(getCallingPackage(), owningUserId);
return mSettingsRegistry.generateSsaidLocked(callingPkg, owningUserId);
}
return ssaid;
@@ -2070,15 +2089,7 @@ public class SettingsProvider extends ContentProvider {
return ByteBuffer.allocate(4).putInt(data.length).array();
}
public Setting generateSsaidLocked(String packageName, int userId) {
final PackageInfo packageInfo;
try {
packageInfo = mPackageManager.getPackageInfo(packageName,
PackageManager.GET_SIGNATURES, userId);
} catch (RemoteException e) {
throw new IllegalStateException("Package info doesn't exist");
}
public Setting generateSsaidLocked(PackageInfo callingPkg, int userId) {
// Read the user's key from the ssaid table.
Setting userKeySetting = getSettingLocked(SETTINGS_TYPE_SSAID, userId, SSAID_USER_KEY);
if (userKeySetting == null || userKeySetting.isNull()
@@ -2113,11 +2124,12 @@ public class SettingsProvider extends ContentProvider {
}
// Mac the package name and each of the signatures.
byte[] packageNameBytes = packageInfo.packageName.getBytes(StandardCharsets.UTF_8);
final String packageName = callingPkg.packageName;
byte[] packageNameBytes = packageName.getBytes(StandardCharsets.UTF_8);
m.update(getLengthPrefix(packageNameBytes), 0, 4);
m.update(packageNameBytes);
for (int i = 0; i < packageInfo.signatures.length; i++) {
byte[] sig = packageInfo.signatures[i].toByteArray();
for (int i = 0; i < callingPkg.signatures.length; i++) {
byte[] sig = callingPkg.signatures[i].toByteArray();
m.update(getLengthPrefix(sig), 0, 4);
m.update(sig);
}
@@ -2127,7 +2139,7 @@ public class SettingsProvider extends ContentProvider {
.toLowerCase(Locale.US);
// Save the ssaid in the ssaid table.
final String uid = Integer.toString(packageInfo.applicationInfo.uid);
final String uid = Integer.toString(callingPkg.applicationInfo.uid);
final SettingsState ssaidSettings = getSettingsLocked(SETTINGS_TYPE_SSAID, userId);
final boolean success = ssaidSettings.insertSettingLocked(uid, ssaid, null, true,
packageName);