Move art::Runtime::InitZygote logic from art into frameworks/base.
Test: m
Test: aosp_angler-eng boots
Change-Id: I964c70576136e7424797140b2f7d179e70298c44
diff --git a/core/jni/com_android_internal_os_Zygote.cpp b/core/jni/com_android_internal_os_Zygote.cpp
index 3f4b2a6..5202a98 100644
--- a/core/jni/com_android_internal_os_Zygote.cpp
+++ b/core/jni/com_android_internal_os_Zygote.cpp
@@ -32,6 +32,7 @@
#include <signal.h>
#include <stdlib.h>
#include <sys/capability.h>
+#include <sys/cdefs.h>
#include <sys/personality.h>
#include <sys/prctl.h>
#include <sys/resource.h>
@@ -667,11 +668,39 @@
static void com_android_internal_os_Zygote_nativeUnmountStorageOnInit(JNIEnv* env, jclass) {
// Zygote process unmount root storage space initially before every child processes are forked.
// Every forked child processes (include SystemServer) only mount their own root storage space
- // And no need unmount storage operation in MountEmulatedStorage method.
- // Zygote process does not utilize root storage spaces and unshared its mount namespace from the ART.
+ // and no need unmount storage operation in MountEmulatedStorage method.
+ // Zygote process does not utilize root storage spaces and unshares its mount namespace below.
+
+ // See storage config details at http://source.android.com/tech/storage/
+ // Create private mount namespace shared by all children
+ if (unshare(CLONE_NEWNS) == -1) {
+ RuntimeAbort(env, __LINE__, "Failed to unshare()");
+ return;
+ }
+
+ // Mark rootfs as being a slave so that changes from default
+ // namespace only flow into our children.
+ if (mount("rootfs", "/", nullptr, (MS_SLAVE | MS_REC), nullptr) == -1) {
+ RuntimeAbort(env, __LINE__, "Failed to mount() rootfs as MS_SLAVE");
+ return;
+ }
+
+ // Create a staging tmpfs that is shared by our children; they will
+ // bind mount storage into their respective private namespaces, which
+ // are isolated from each other.
+ const char* target_base = getenv("EMULATED_STORAGE_TARGET");
+ if (target_base != nullptr) {
+#define STRINGIFY_UID(x) __STRING(x)
+ if (mount("tmpfs", target_base, "tmpfs", MS_NOSUID | MS_NODEV,
+ "uid=0,gid=" STRINGIFY_UID(AID_SDCARD_R) ",mode=0751") == -1) {
+ ALOGE("Failed to mount tmpfs to %s", target_base);
+ RuntimeAbort(env, __LINE__, "Failed to mount tmpfs");
+ return;
+ }
+#undef STRINGIFY_UID
+ }
UnmountTree("/storage");
- return;
}
static const JNINativeMethod gMethods[] = {