Add libkeyutils.

Also move init over to it.

Bug: http://b/37991155
Test: builds+boots
Change-Id: I5113a9d96a5ce0a0f3bad71134d6cc4f7b41a57e
diff --git a/init/Android.mk b/init/Android.mk
index 537bbee..c7a41e3 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -124,7 +124,8 @@
     libsparse \
     libz \
     libprocessgroup \
-    libavb
+    libavb \
+    libkeyutils \
 
 # Create symlinks.
 LOCAL_POST_INSTALL_CMD := $(hide) mkdir -p $(TARGET_ROOT_OUT)/sbin; \
diff --git a/init/init.cpp b/init/init.cpp
index b5f97e5..a8f5f97 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -21,7 +21,6 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
-#include <keyutils.h>
 #include <libgen.h>
 #include <paths.h>
 #include <signal.h>
@@ -39,10 +38,6 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
-#include <selinux/selinux.h>
-#include <selinux/label.h>
-#include <selinux/android.h>
-
 #include <android-base/chrono_utils.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
@@ -50,8 +45,12 @@
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <android-base/unique_fd.h>
+#include <keyutils.h>
 #include <libavb/libavb.h>
 #include <private/android_filesystem_config.h>
+#include <selinux/android.h>
+#include <selinux/label.h>
+#include <selinux/selinux.h>
 
 #include <fstream>
 #include <memory>
@@ -1024,7 +1023,7 @@
     // Set up a session keyring that all processes will have access to. It
     // will hold things like FBE encryption keys. No process should override
     // its session keyring.
-    keyctl(KEYCTL_GET_KEYRING_ID, KEY_SPEC_SESSION_KEYRING, 1);
+    keyctl_get_keyring_ID(KEY_SPEC_SESSION_KEYRING, 1);
 
     // Indicate that booting is in progress to background fw loaders, etc.
     close(open("/dev/.booting", O_WRONLY | O_CREAT | O_CLOEXEC, 0000));
diff --git a/init/keyutils.h b/init/keyutils.h
deleted file mode 100644
index de01beb..0000000
--- a/init/keyutils.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/* Miniature version of a header-only keyutils.h (no library required) */
-
-#ifndef _INIT_KEYUTILS_H_
-#define _INIT_KEYUTILS_H_
-
-#ifndef KEYUTILS_H /* walk away if the _real_ one exists */
-
-#include <linux/keyctl.h>
-#include <stdarg.h>
-#include <sys/syscall.h>
-#include <unistd.h>
-
-static inline long keyctl(int cmd, ...) {
-    va_list va;
-    unsigned long arg2, arg3, arg4, arg5;
-
-    va_start(va, cmd);
-    arg2 = va_arg(va, unsigned long);
-    arg3 = va_arg(va, unsigned long);
-    arg4 = va_arg(va, unsigned long);
-    arg5 = va_arg(va, unsigned long);
-    va_end(va);
-    return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
-}
-
-#endif
-
-#endif