feature: add devpts fd wrapper (#21)

This feature is intended to resolve devpts problem.

kernel/selinux/selinux.c

@@ -263,16 +263,15 @@ void susfs_set_kernel_sid(void)
 }
 #endif
 
-#define DEVPTS_DOMAIN "u:object_r:ksu_file:s0"
+#define KSU_FILE_DOMAIN "u:object_r:ksu_file:s0"
 
-u32 ksu_get_devpts_sid(void)
+u32 ksu_get_ksu_file_sid()
 {
-    u32 devpts_sid = 0;
-    int err = security_secctx_to_secid(DEVPTS_DOMAIN, strlen(DEVPTS_DOMAIN),
-                       &devpts_sid);
-
-    if (err)
-        pr_info("get devpts sid err %d\n", err);
-
-    return devpts_sid;
+    u32 ksu_file_sid = 0;
+    int err = security_secctx_to_secid(KSU_FILE_DOMAIN, strlen(KSU_FILE_DOMAIN),
+                       &ksu_file_sid);
+    if (err) {
+        pr_info("get ksufile sid err %d\n", err);
+    }
+    return ksu_file_sid;
 }

kernel/selinux/selinux.h

@@ -35,7 +35,7 @@ void susfs_set_init_sid(void);
 bool susfs_is_current_init_domain(void);
 #endif
 
-u32 ksu_get_devpts_sid(void);
+u32 ksu_get_ksu_file_sid(void);
 
 int handle_sepolicy(unsigned long arg3, void __user *arg4);