Revive SUS_MAP feature

- More details in boot-completed.sh template, ksu_susfs usage and KernelSU Kconfig

Co-authored-by: simonpunk <simonpunk2016@gmail.com>

kernel/Kconfig

@@ -217,6 +217,17 @@ config KSU_SUSFS_SUS_SU
                 the same as the su implementaion of non-gki kernel without kprobe supported.
       - Only apps with root access granted by ksu manager are allowed to get root.
 
+config KSU_SUSFS_SUS_MAP
+    bool "Enable to hide some mmapped real file from different proc maps interfaces"
+    depends on KSU_SUSFS
+    default y
+    help
+      - Allow hiding mmapped real file from /proc/<pid>/[maps|smaps|smaps_rollup|map_files|mem|pagemap]
+      - It does NOT support hiding for anon memory.
+      - It does NOT hide any inline hooks or plt hooks cause by the injected library itself.
+      - It may not be able to evade detections by apps that implement a good injection detection.
+      - Effective only on zygote spawned umounted user app process.
+
 endmenu
 
 endmenu

kernel/core_hook.c

@@ -1255,6 +1255,24 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 			return 0;
 		}
 #endif // #ifdef CONFIG_KSU_SUSFS_SUS_SU
+#ifdef CONFIG_KSU_SUSFS_SUS_MAP
+		if (arg2 == CMD_SUSFS_ADD_SUS_MAP) {
+			int error = 0;
+			if (!ksu_access_ok((void __user*)arg3, sizeof(struct st_susfs_sus_map))) {
+					pr_err("susfs: CMD_SUSFS_ADD_SUS_MAP -> arg3 is not accessible\n");
+					return 0;
+			}
+			if (!ksu_access_ok((void __user*)arg5, sizeof(error))) {
+					pr_err("susfs: CMD_SUSFS_ADD_SUS_MAP -> arg5 is not accessible\n");
+					return 0;
+			}
+			error = susfs_add_sus_map((struct st_susfs_sus_map __user*)arg3);
+			pr_info("susfs: CMD_SUSFS_ADD_SUS_MAP -> ret: %d\n", error);
+			if (copy_to_user((void __user*)arg5, &error, sizeof(error)))
+					pr_info("susfs: copy_to_user() failed\n");
+			return 0;
+		}
+#endif // #ifdef CONFIG_KSU_SUSFS_SUS_MAP
 		if (arg2 == CMD_SUSFS_ENABLE_AVC_LOG_SPOOFING) {
 			int error = 0;
 			if (arg3 != 0 && arg3 != 1) {