From bce28cc3ca9ca2383bf352cd31bbee5a073e1c47 Mon Sep 17 00:00:00 2001
From: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>
Date: Mon, 16 Jun 2025 19:36:37 +0800
Subject: [PATCH] kernel: add CMD_GET_SUSFS_FEATURE_STATUS command to get the
 correct functional state of SUSFS

---
 kernel/core_hook.c | 116 +++++++++++++++++++++++++++++++++++++++++++++
 kernel/ksu.h       |  20 ++++++++
 2 files changed, 136 insertions(+)

diff --git a/kernel/core_hook.c b/kernel/core_hook.c
index 07f47906..60f68f5b 100644
--- a/kernel/core_hook.c
+++ b/kernel/core_hook.c
@@ -522,6 +522,8 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 		return 0;
 	}
 #endif
+
+	// Check if kpm is enabled
 	if (arg2 == CMD_ENABLE_KPM) {
     	bool KPM_Enabled = IS_ENABLED(CONFIG_KPM);
     	if (copy_to_user((void __user *)arg3, &KPM_Enabled, sizeof(KPM_Enabled)))
@@ -529,6 +531,7 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
     	return 0;
 	}
 
+	// Checking hook usage
 	if (arg2 == CMD_HOOK_TYPE) {
 		const char *hook_type;
 		
@@ -552,6 +555,119 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 		return 0;
 	}
 
+	// Get SUSFS function status
+	if (arg2 == CMD_GET_SUSFS_FEATURE_STATUS) {
+		struct susfs_feature_status status;
+		
+		memset(&status, 0, sizeof(status));
+		
+		if (!ksu_access_ok((void __user*)arg3, sizeof(status))) {
+			pr_err("susfs_feature_status: arg3 is not accessible\n");
+			return 0;
+		}
+#ifdef CONFIG_KSU_SUSFS_SUS_PATH
+		status.status_sus_path = true;
+#else
+		status.status_sus_path = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_SUS_MOUNT
+		status.status_sus_mount = true;
+#else
+		status.status_sus_mount = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_AUTO_ADD_SUS_KSU_DEFAULT_MOUNT
+		status.status_auto_default_mount = true;
+#else
+		status.status_auto_default_mount = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_AUTO_ADD_SUS_BIND_MOUNT
+		status.status_auto_bind_mount = true;
+#else
+		status.status_auto_bind_mount = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_SUS_KSTAT
+		status.status_sus_kstat = true;
+#else
+		status.status_sus_kstat = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_TRY_UMOUNT
+		status.status_try_umount = true;
+#else
+		status.status_try_umount = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_AUTO_ADD_TRY_UMOUNT_FOR_BIND_MOUNT
+		status.status_auto_try_umount_bind = true;
+#else
+		status.status_auto_try_umount_bind = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_SPOOF_UNAME
+		status.status_spoof_uname = true;
+#else
+		status.status_spoof_uname = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_ENABLE_LOG
+		status.status_enable_log = true;
+#else
+		status.status_enable_log = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_HIDE_KSU_SUSFS_SYMBOLS
+		status.status_hide_symbols = true;
+#else
+		status.status_hide_symbols = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_SPOOF_CMDLINE_OR_BOOTCONFIG
+		status.status_spoof_cmdline = true;
+#else
+		status.status_spoof_cmdline = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_OPEN_REDIRECT
+		status.status_open_redirect = true;
+#else
+		status.status_open_redirect = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_HAS_MAGIC_MOUNT
+		status.status_magic_mount = true;
+#else
+		status.status_magic_mount = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_SUS_OVERLAYFS
+		status.status_overlayfs_auto_kstat = true;
+#else
+		status.status_overlayfs_auto_kstat = false;
+#endif
+
+#ifdef CONFIG_KSU_SUSFS_SUS_SU
+		status.status_sus_su = true;
+#else
+		status.status_sus_su = false;
+#endif
+
+		if (copy_to_user((void __user*)arg3, &status, sizeof(status))) {
+			pr_err("susfs_feature_status: copy_to_user failed\n");
+			return 0;
+		}
+		
+		if (copy_to_user(result, &reply_ok, sizeof(reply_ok))) {
+			pr_err("susfs_feature_status: prctl reply error\n");
+		}
+		
+		pr_info("susfs_feature_status: successfully returned feature status\n");
+		return 0;
+	}
+
 #ifdef CONFIG_KSU_SUSFS
 	if (current_uid_val == 0) {
 #ifdef CONFIG_KSU_SUSFS_SUS_PATH
diff --git a/kernel/ksu.h b/kernel/ksu.h
index 0dd2cec9..13496bdd 100644
--- a/kernel/ksu.h
+++ b/kernel/ksu.h
@@ -25,6 +25,7 @@
 #define CMD_ENABLE_SU 15
 #define CMD_ENABLE_KPM 100
 #define CMD_HOOK_TYPE 101
+#define CMD_GET_SUSFS_FEATURE_STATUS 102
 
 #define EVENT_POST_FS_DATA 1
 #define EVENT_BOOT_COMPLETED 2
@@ -36,6 +37,25 @@
 #define KSU_MAX_GROUPS 32
 #define KSU_SELINUX_DOMAIN 64
 
+// SUSFS Functional State Structures
+struct susfs_feature_status {
+	bool status_sus_path;
+	bool status_sus_mount;
+	bool status_auto_default_mount;
+	bool status_auto_bind_mount;
+	bool status_sus_kstat;
+	bool status_try_umount;
+	bool status_auto_try_umount_bind;
+	bool status_spoof_uname;
+	bool status_enable_log;
+	bool status_hide_symbols;
+	bool status_spoof_cmdline;
+	bool status_open_redirect;
+	bool status_magic_mount;
+	bool status_overlayfs_auto_kstat;
+	bool status_sus_su;
+};
+
 struct root_profile {
 	int32_t uid;
 	int32_t gid;