init: remove restorecon() from util.cpp

restorecon() has become nothing more than a small wrapper around
selinux_android_restore().  This itself isn't super problematic, but
it is an obstacle for compiling util.cpp on the host as that function
is not available on the host.

Bug: 36970783
Test: Boot bullhead
Merged-In: I7e209ece6898f9a0d5eb9e5d5d8155c2f1ba9faf
Change-Id: I7e209ece6898f9a0d5eb9e5d5d8155c2f1ba9faf

init/builtins.cpp

@@ -762,7 +762,7 @@ static int do_restorecon(const std::vector<std::string>& args) {
             }
         } else {
             in_flags = false;
-            if (restorecon(args[i].c_str(), flag) < 0) {
+            if (selinux_android_restorecon(args[i].c_str(), flag) < 0) {
                 ret = -errno;
             }
         }

init/devices.cpp

@@ -251,7 +251,7 @@ static void fixup_sys_permissions(const std::string& upath, const std::string& s
 
     if (access(path.c_str(), F_OK) == 0) {
         LOG(VERBOSE) << "restorecon_recursive: " << path;
-        restorecon(path.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE);
+        selinux_android_restorecon(path.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE);
     }
 }
 

init/init.cpp

@@ -871,23 +871,23 @@ static void selinux_initialize(bool in_kernel_domain) {
 // value. This must happen before /dev is populated by ueventd.
 static void selinux_restore_context() {
     LOG(INFO) << "Running restorecon...";
-    restorecon("/dev");
-    restorecon("/dev/kmsg");
+    selinux_android_restorecon("/dev", 0);
+    selinux_android_restorecon("/dev/kmsg", 0);
     if constexpr (WORLD_WRITABLE_KMSG) {
-      restorecon("/dev/kmsg_debug");
+      selinux_android_restorecon("/dev/kmsg_debug", 0);
     }
-    restorecon("/dev/socket");
-    restorecon("/dev/random");
-    restorecon("/dev/urandom");
-    restorecon("/dev/__properties__");
-    restorecon("/plat_property_contexts");
-    restorecon("/nonplat_property_contexts");
-    restorecon("/sys", SELINUX_ANDROID_RESTORECON_RECURSE);
-    restorecon("/dev/block", SELINUX_ANDROID_RESTORECON_RECURSE);
-    restorecon("/dev/device-mapper");
+    selinux_android_restorecon("/dev/socket", 0);
+    selinux_android_restorecon("/dev/random", 0);
+    selinux_android_restorecon("/dev/urandom", 0);
+    selinux_android_restorecon("/dev/__properties__", 0);
+    selinux_android_restorecon("/plat_property_contexts", 0);
+    selinux_android_restorecon("/nonplat_property_contexts", 0);
+    selinux_android_restorecon("/sys", SELINUX_ANDROID_RESTORECON_RECURSE);
+    selinux_android_restorecon("/dev/block", SELINUX_ANDROID_RESTORECON_RECURSE);
+    selinux_android_restorecon("/dev/device-mapper", 0);
 
-    restorecon("/sbin/mke2fs");
-    restorecon("/sbin/e2fsdroid");
+    selinux_android_restorecon("/sbin/mke2fs", 0);
+    selinux_android_restorecon("/sbin/e2fsdroid", 0);
 }
 
 // Set the UDC controller for the ConfigFS USB Gadgets.
@@ -996,7 +996,7 @@ int main(int argc, char** argv) {
 
         // We're in the kernel domain, so re-exec init to transition to the init domain now
         // that the SELinux policy has been loaded.
-        if (restorecon("/init") == -1) {
+        if (selinux_android_restorecon("/init", 0) == -1) {
             PLOG(ERROR) << "restorecon failed";
             security_failure();
         }

init/property_service.cpp

@@ -177,7 +177,7 @@ uint32_t property_set(const std::string& name, const std::string& value) {
     }
 
     if (name == "selinux.restorecon_recursive" && valuelen > 0) {
-        if (restorecon(value.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE) != 0) {
+        if (selinux_android_restorecon(value.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE) != 0) {
             LOG(ERROR) << "Failed to restorecon_recursive " << value;
         }
     }

init/util.cpp

@@ -266,11 +266,6 @@ int make_dir(const char* path, mode_t mode, selabel_handle* sehandle) {
     return rc;
 }
 
-int restorecon(const char* pathname, int flags)
-{
-    return selinux_android_restorecon(pathname, flags);
-}
-
 /*
  * Writes hex_len hex characters (1/2 byte) to hex from bytes.
  */

init/util.h

@@ -68,7 +68,6 @@ int wait_for_file(const char *filename, std::chrono::nanoseconds timeout);
 void import_kernel_cmdline(bool in_qemu,
                            const std::function<void(const std::string&, const std::string&, bool)>&);
 int make_dir(const char* path, mode_t mode, selabel_handle* sehandle);
-int restorecon(const char *pathname, int flags = 0);
 std::string bytes_to_hex(const uint8_t *bytes, size_t bytes_len);
 bool is_dir(const char* pathname);
 bool expand_props(const std::string& src, std::string* dst);