DivestOS/Patches/LineageOS-17.1/android_frameworks_base/355763-backport.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Songchun Fan <schfan@google.com>
Date: Thu, 26 Jan 2023 17:43:24 -0800
Subject: [PATCH] prevent system app downgrades of versions lower than preload
Also remove misleading commandline output.
BUG: 256202273
Test: manual
1. Install preload system app v90, reboot
2. (W/O data, W/ Flag, 90->80 NOK) adb install -d ~/Downloads/PrivApplication_80.apk
Performing Streamed Install
adb: failed to install /usr/local/google/home/schfan/Downloads/PrivApplication_80.apk: Failure [INSTALL_FAILED_VERSION_DOWNGRADE: System app: com.example.privapplication cannot be downgraded to older than its preloaded version on the system image. Update version code 80 is older than current 90]
3. (90->100) Install data app v100
4. (W/ data, W/O Flag, 100->90 NOK) adb install ~/Downloads/PrivApplication_90.apk
Performing Streamed Install
adb: failed to install /usr/local/google/home/schfan/Downloads/PrivApplication_90.apk: Failure [INSTALL_FAILED_VERSION_DOWNGRADE: Downgrade detected: Update version code 90 is older than current 100]
5. (W/ data, W/ Flag, 100->90 downgrade OK) adb install -d ~/Downloads/PrivApplication_90.apk
Performing Streamed Install
Success
6. (90->100) Install v100
6. (W/data, W/ Flag, 100->80 NOK) adb install -d ~/Downloads/PrivApplication_80.apk
Performing Streamed Install
adb: failed to install /usr/local/google/home/schfan/Downloads/PrivApplication_80.apk: Failure [INSTALL_FAILED_VERSION_DOWNGRADE: System app: com.example.privapplication cannot be downgraded to older than its preloaded version on the system image. Update version code 80 is older than current 90]
Change-Id: I5a8ee9e29a3a58f6e3fd188e0122355744b8b0ce
(cherry picked from commit a4484d7f1be1fa413258fe18644d61f85611f586)
(cherry picked from commit on googleplex-android-review.googlesource.com host: aec76152d65cfd5774f6c0dcf4cb6009ba48c1ee)
Merged-In: I5a8ee9e29a3a58f6e3fd188e0122355744b8b0ce
---
.../server/pm/PackageManagerService.java | 26 ++++++++++++++++---
1 file changed, 23 insertions(+), 3 deletions(-)
diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index ef97d61d26d7..068cb345d463 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -15281,10 +15281,10 @@ public class PackageManagerService extends IPackageManager.Stub
// will be null whereas dataOwnerPkg will contain information about the package
// which was uninstalled while keeping its data.
PackageParser.Package dataOwnerPkg = installedPkg;
+ PackageSetting dataOwnerPs= mSettings.mPackages.get(packageName);
if (dataOwnerPkg == null) {
- PackageSetting ps = mSettings.mPackages.get(packageName);
- if (ps != null) {
- dataOwnerPkg = ps.pkg;
+ if (dataOwnerPs != null) {
+ dataOwnerPkg = dataOwnerPs.pkg;
}
}
@@ -15308,12 +15308,32 @@ public class PackageManagerService extends IPackageManager.Stub
if (dataOwnerPkg != null) {
if (!PackageManagerServiceUtils.isDowngradePermitted(installFlags,
dataOwnerPkg.applicationInfo.flags)) {
+ // Downgrade is not permitted; a lower version of the app will not be
+ // allowed
try {
checkDowngrade(dataOwnerPkg, pkgLite);
} catch (PackageManagerException e) {
Slog.w(TAG, "Downgrade detected: " + e.getMessage());
return PackageHelper.RECOMMEND_FAILED_VERSION_DOWNGRADE;
}
+ } else if (dataOwnerPs.isSystem()) {
+ // Downgrade is permitted, but system apps can't be downgraded below
+ // the version preloaded onto the system image
+ final PackageSetting disabledPs = mSettings.getDisabledSystemPkgLPr(
+ dataOwnerPs);
+ if (disabledPs != null) {
+ dataOwnerPkg = disabledPs.pkg;
+ }
+ try {
+ checkDowngrade(dataOwnerPkg, pkgLite);
+ } catch (PackageManagerException e) {
+ String errorMsg = "System app: " + packageName
+ + " cannot be downgraded to"
+ + " older than its preloaded version on the system image. "
+ + e.getMessage();
+ Slog.w(TAG, errorMsg);
+ return PackageHelper.RECOMMEND_FAILED_VERSION_DOWNGRADE;
+ }
}
}