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Modify conditions for preventing updated system apps from being downgraded

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Add two conditions prior to deciding whether a specific user can
downgrade system apps by deletePackageX.

1.uninstalledPs must be a updated system app.
2.deleteFlags does not contains PackageManager.DELETE_SYSTEM_APP,
since flag PackageManager.DELETE_SYSTEM_APP will just mark the app
as uninstalled for the specific user instead of uninstalling the
update and rolling back to the older system version.

Bug: 236578018
Test: atest DeletePackageHelperTest
Change-Id: I55a3d322e84aaaced69bd5edeaf90e82ac9a0dd3
This commit is contained in:
Oli Lan
2022-06-29 15:23:04 +01:00
parent 4218c30042
commit 02a03d774e
2 changed files with 21 additions and 8 deletions
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3
services/core/java/com/android/server/pm/DeletePackageHelper.java
View File

@@ -163,7 +163,8 @@ final class DeletePackageHelper {
return PackageManager.DELETE_FAILED_INTERNAL_ERROR;
}
if (PackageManagerServiceUtils.isSystemApp(uninstalledPs)) {
if (PackageManagerServiceUtils.isUpdatedSystemApp(uninstalledPs)
&& ((deleteFlags & PackageManager.DELETE_SYSTEM_APP) == 0)) {
UserInfo userInfo = mUserManagerInternal.getUserInfo(userId);
if (userInfo == null || (!userInfo.isAdmin() && !mUserManagerInternal.getUserInfo(
mUserManagerInternal.getProfileParentId(userId)).isAdmin())) {

26
services/tests/mockingservicestests/src/com/android/server/pm/DeletePackageHelperTest.kt
View File

@@ -70,13 +70,12 @@ class DeletePackageHelperTest {
@Test
fun deleteSystemPackageFailsIfNotAdminAndNotProfile() {
val ps = mPms.mSettings.getPackageLPr("a.data.package")
whenever(PackageManagerServiceUtils.isSystemApp(ps)).thenReturn(true)
whenever(PackageManagerServiceUtils.isUpdatedSystemApp(ps)).thenReturn(true)
whenever(mUserManagerInternal.getUserInfo(1)).thenReturn(UserInfo(1, "test", 0))
whenever(mUserManagerInternal.getProfileParentId(1)).thenReturn(1)
val dph = DeletePackageHelper(mPms)
val result = dph.deletePackageX("a.data.package", 1L, 1,
PackageManager.DELETE_SYSTEM_APP, false)
val result = dph.deletePackageX("a.data.package", 1L, 1, 0, false)
assertThat(result).isEqualTo(PackageManager.DELETE_FAILED_USER_RESTRICTED)
}
@@ -86,7 +85,7 @@ class DeletePackageHelperTest {
val userId = 1
val parentId = 5
val ps = mPms.mSettings.getPackageLPr("a.data.package")
whenever(PackageManagerServiceUtils.isSystemApp(ps)).thenReturn(true)
whenever(PackageManagerServiceUtils.isUpdatedSystemApp(ps)).thenReturn(true)
whenever(mUserManagerInternal.getUserInfo(userId)).thenReturn(
UserInfo(userId, "test", UserInfo.FLAG_PROFILE))
whenever(mUserManagerInternal.getProfileParentId(userId)).thenReturn(parentId)
@@ -94,8 +93,7 @@ class DeletePackageHelperTest {
UserInfo(userId, "testparent", 0))
val dph = DeletePackageHelper(mPms)
val result = dph.deletePackageX("a.data.package", 1L, userId,
PackageManager.DELETE_SYSTEM_APP, false)
val result = dph.deletePackageX("a.data.package", 1L, userId, 0, false)
assertThat(result).isEqualTo(PackageManager.DELETE_FAILED_USER_RESTRICTED)
}
@@ -132,4 +130,18 @@ class DeletePackageHelperTest {
assertThat(result).isEqualTo(PackageManager.DELETE_SUCCEEDED)
}
}
@Test
fun deleteSystemPackageSucceedsIfNotAdminButDeleteSystemAppSpecified() {
val ps = mPms.mSettings.getPackageLPr("a.data.package")
whenever(PackageManagerServiceUtils.isUpdatedSystemApp(ps)).thenReturn(true)
whenever(mUserManagerInternal.getUserInfo(1)).thenReturn(UserInfo(1, "test", 0))
whenever(mUserManagerInternal.getProfileParentId(1)).thenReturn(1)
val dph = DeletePackageHelper(mPms)
val result = dph.deletePackageX("a.data.package", 1L, 1,
PackageManager.DELETE_SYSTEM_APP, false)
assertThat(result).isEqualTo(PackageManager.DELETE_SUCCEEDED)
}
}