diff --git a/kernel/src/sys/stat.cpp b/kernel/src/sys/stat.cpp
index abe517bf..49a5ad10 100644
--- a/kernel/src/sys/stat.cpp
+++ b/kernel/src/sys/stat.cpp
@@ -5,7 +5,6 @@
 #include "sys/UserMemory.h"
 #include "thread/Scheduler.h"
 
-typedef unsigned long off_t;
 typedef unsigned short mode_t;
 typedef unsigned long ino_t;
 
@@ -15,6 +14,8 @@ struct stat // FIXME: This struct is quite stubbed out.
     mode_t st_mode;
     off_t st_size;
     int st_dev; // FIXME: Implement this.
+    uid_t st_uid;
+    gid_t st_gid;
 };
 
 void do_stat(Context* context, VFS::Node* node, struct stat* buf)
@@ -26,8 +27,10 @@ void do_stat(Context* context, VFS::Node* node, struct stat* buf)
         return;
     }
     kstat->st_ino = node->inode;
-    kstat->st_mode = (mode_t)node->type;
+    kstat->st_mode = node->mode | ((1 << (node->type)) * 010000);
     kstat->st_size = node->length;
+    kstat->st_uid = node->uid;
+    kstat->st_gid = node->gid;
     release_user_ref(kstat);
     context->rax = 0;
 }
diff --git a/libs/libc/include/luna/vfs.h b/libs/libc/include/luna/vfs.h
index 3cc260a9..e34c83eb 100644
--- a/libs/libc/include/luna/vfs.h
+++ b/libs/libc/include/luna/vfs.h
@@ -5,4 +5,6 @@
 #define __VFS_DIRECTORY 0x1
 #define __VFS_DEVICE 0x2
 
+#define __VFS_TO_IFMT(type) ((1 << type) * 010000)
+
 #endif
\ No newline at end of file
diff --git a/libs/libc/include/sys/stat.h b/libs/libc/include/sys/stat.h
index f66d42ef..e96c766f 100644
--- a/libs/libc/include/sys/stat.h
+++ b/libs/libc/include/sys/stat.h
@@ -10,18 +10,49 @@ struct stat // FIXME: This struct is quite stubbed out.
     mode_t st_mode;
     off_t st_size;
     int st_dev; // Not implemented.
+    uid_t st_uid;
+    gid_t st_gid;
 };
 
-#define S_ISDIR(mode) (((mode)&0xf) == __VFS_DIRECTORY)
-#define S_ISREG(mode) (((mode)&0xf) == __VFS_FILE)
-#define S_ISCHR(mode) (((mode)&0xf) == __VFS_DEVICE)
+/* Type of file. */
+#define S_IFMT 070000
+/* Directory. */
+#define S_IFDIR __VFS_TO_IFMT(__VFS_DIRECTORY)
+/* Regular file. */
+#define S_IFREG __VFS_TO_IFMT(__VFS_FILE)
+/* Character device. */
+#define S_IFCHR __VFS_TO_IFMT(__VFS_DEVICE)
+
+#define __S_IFCMP(mode, value) (mode & S_IFMT) == value
+
+/* Is it a directory? */
+#define S_ISDIR(mode) (__S_IFCMP((mode), S_IFDIR))
+/* Is it a regular file? */
+#define S_ISREG(mode) (__S_IFCMP((mode), S_IFREG))
+/* Is it a character device? */
+#define S_ISCHR(mode) (__S_IFCMP((mode), S_IFCHR))
+
+#define S_IRWXU 0700
+#define S_IRUSR 0400
+#define S_IWUSR 0200
+#define S_IXUSR 0100
+#define S_IRWXG 070
+#define S_IRGRP 040
+#define S_IWGRP 020
+#define S_IXGRP 010
+#define S_IRWXO 07
+#define S_IROTH 04
+#define S_IWOTH 02
+#define S_IXOTH 01
+#define S_ISUID 04000
+#define S_ISGID 02000
 
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
-    /* Creates a new directory at the path pathname. FIXME: For now, mode is ignored. */
+    /* Creates a new directory at the path pathname with the specified mode. */
     int mkdir(const char* pathname, mode_t mode);
 
     /* Returns information about the file pointed to by fd in buf. */
diff --git a/libs/libc/include/sys/types.h b/libs/libc/include/sys/types.h
index 843a8974..e8d0135e 100644
--- a/libs/libc/include/sys/types.h
+++ b/libs/libc/include/sys/types.h
@@ -28,4 +28,10 @@ typedef long int time_t;
 /* Type representing signed time in microseconds. */
 typedef long int suseconds_t;
 
+/* Type representing a user ID. */
+typedef int uid_t;
+
+/* Type representing a group ID. */
+typedef int gid_t;
+
 #endif
\ No newline at end of file