Reinstate codes to enable RRO on system server
Test: building succeeded and tested with sailfish
Bug: 35742444
Change-Id: I99d0f1d097525d3eb46255d6cf823f6ae2a02385
diff --git a/core/jni/android_util_AssetManager.cpp b/core/jni/android_util_AssetManager.cpp
index c2800e7..373bda9 100644
--- a/core/jni/android_util_AssetManager.cpp
+++ b/core/jni/android_util_AssetManager.cpp
@@ -119,6 +119,96 @@
return block;
}
+// This is called by zygote (running as user root) as part of preloadResources.
+static void verifySystemIdmaps()
+{
+ pid_t pid;
+ char system_id[10];
+
+ snprintf(system_id, sizeof(system_id), "%d", AID_SYSTEM);
+
+ switch (pid = fork()) {
+ case -1:
+ ALOGE("failed to fork for idmap: %s", strerror(errno));
+ break;
+ case 0: // child
+ {
+ struct __user_cap_header_struct capheader;
+ struct __user_cap_data_struct capdata;
+
+ memset(&capheader, 0, sizeof(capheader));
+ memset(&capdata, 0, sizeof(capdata));
+
+ capheader.version = _LINUX_CAPABILITY_VERSION;
+ capheader.pid = 0;
+
+ if (capget(&capheader, &capdata) != 0) {
+ ALOGE("capget: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ capdata.effective = capdata.permitted;
+ if (capset(&capheader, &capdata) != 0) {
+ ALOGE("capset: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ if (setgid(AID_SYSTEM) != 0) {
+ ALOGE("setgid: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ if (setuid(AID_SYSTEM) != 0) {
+ ALOGE("setuid: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ // Generic idmap parameters
+ const char* argv[8];
+ int argc = 0;
+ struct stat st;
+
+ memset(argv, NULL, sizeof(argv));
+ argv[argc++] = AssetManager::IDMAP_BIN;
+ argv[argc++] = "--scan";
+ argv[argc++] = AssetManager::TARGET_PACKAGE_NAME;
+ argv[argc++] = AssetManager::TARGET_APK_PATH;
+ argv[argc++] = AssetManager::IDMAP_DIR;
+
+ // Directories to scan for overlays: if OVERLAY_THEME_DIR_PROPERTY is defined,
+ // use OVERLAY_DIR/<value of OVERLAY_THEME_DIR_PROPERTY> in addition to OVERLAY_DIR.
+ char subdir[PROP_VALUE_MAX];
+ int len = __system_property_get(AssetManager::OVERLAY_THEME_DIR_PERSIST_PROPERTY,
+ subdir);
+ if (len == 0) {
+ len = __system_property_get(AssetManager::OVERLAY_THEME_DIR_PROPERTY, subdir);
+ }
+ if (len > 0) {
+ String8 overlayPath = String8(AssetManager::OVERLAY_DIR) + "/" + subdir;
+ if (stat(overlayPath.string(), &st) == 0) {
+ argv[argc++] = overlayPath.string();
+ }
+ }
+ if (stat(AssetManager::OVERLAY_DIR, &st) == 0) {
+ argv[argc++] = AssetManager::OVERLAY_DIR;
+ }
+
+ // Finally, invoke idmap (if any overlay directory exists)
+ if (argc > 5) {
+ execv(AssetManager::IDMAP_BIN, (char* const*)argv);
+ ALOGE("failed to execv for idmap: %s", strerror(errno));
+ exit(1); // should never get here
+ } else {
+ exit(0);
+ }
+ }
+ break;
+ default: // parent
+ waitpid(pid, NULL, 0);
+ break;
+ }
+}
+
// ----------------------------------------------------------------------------
// this guy is exported to other jni routines
@@ -1507,6 +1597,9 @@
static void android_content_AssetManager_init(JNIEnv* env, jobject clazz, jboolean isSystem)
{
+ if (isSystem) {
+ verifySystemIdmaps();
+ }
AssetManager* am = new AssetManager();
if (am == NULL) {
jniThrowException(env, "java/lang/OutOfMemoryError", "");