manager: Provide backward compatibility for legacy kernels

manager/app/src/main/cpp/CMakeLists.txt

@@ -10,6 +10,7 @@ add_library(kernelsu
         SHARED
         jni.c
         ksu.c
+        legacy.c
 )
 
 find_library(log-lib log)

manager/app/src/main/cpp/ksu.c

@@ -90,22 +90,30 @@ uint32_t get_version() {
 	return info.version;
 }
 
-struct ksu_version_info legacy_get_info()
-{
-    int32_t version = -1;
-    int32_t flags = 0;
-    ksuctl_prctl(CMD_GET_VERSION, &version, &flags);
-    return (struct ksu_version_info){version, flags};
-}
-
 bool get_allow_list(struct ksu_get_allow_list_cmd *cmd) {
-	return ksuctl(KSU_IOCTL_GET_ALLOW_LIST, cmd) == 0;
+    if (ksuctl(KSU_IOCTL_GET_ALLOW_LIST, cmd) == 0) {
+        return true;
+    }
+
+    // fallback to legacy
+    int size = 0;
+    int uids[1024];
+    if (legacy_get_allow_list(uids, &size)) {
+        cmd->count = size;
+        memcpy(cmd->uids, uids, sizeof(int) * size);
+        return true;
+    }
+
+    return false;
 }
 
 bool is_safe_mode() {
     struct ksu_check_safemode_cmd cmd = {};
-	ksuctl(KSU_IOCTL_CHECK_SAFEMODE, &cmd);
+    if (ksuctl(KSU_IOCTL_CHECK_SAFEMODE, &cmd) == 0) {
         return cmd.in_safe_mode;
+    }
+    // fallback
+    return legacy_is_safe_mode();
 }
 
 bool is_lkm_mode() {
@@ -113,6 +121,7 @@ bool is_lkm_mode() {
     if (info.version > 0) {
         return (info.flags & 0x1) != 0;
     }
+    // Legacy Compatible
     return (legacy_get_info().flags & 0x1) != 0;
 }
 
@@ -121,46 +130,55 @@ bool is_manager() {
     if (info.version > 0) {
         return (info.flags & 0x2) != 0;
     }
+    // Legacy Compatible
     return legacy_get_info().version;
 }
 
 bool uid_should_umount(int uid) {
     struct ksu_uid_should_umount_cmd cmd = {};
     cmd.uid = uid;
-	ksuctl(KSU_IOCTL_UID_SHOULD_UMOUNT, &cmd);
+    if (ksuctl(KSU_IOCTL_UID_SHOULD_UMOUNT, &cmd) == 0) {
         return cmd.should_umount;
+    }
+    return legacy_uid_should_umount(uid);
 }
 
 bool set_app_profile(const struct app_profile *profile) {
     struct ksu_set_app_profile_cmd cmd = {};
     cmd.profile = *profile;
-	return ksuctl(KSU_IOCTL_SET_APP_PROFILE, &cmd) == 0;
+    if (ksuctl(KSU_IOCTL_SET_APP_PROFILE, &cmd) == 0) {
+        return true;
+    }
+    return legacy_set_app_profile(profile);
 }
 
 int get_app_profile(struct app_profile *profile) {
     struct ksu_get_app_profile_cmd cmd = {.profile = *profile};
     int ret = ksuctl(KSU_IOCTL_GET_APP_PROFILE, &cmd);
+    if (ret == 0) {
         *profile = cmd.profile;
-	return ret;
+        return 0;
+    }
+    return legacy_get_app_profile(profile->key, profile) ? 0 : -1;
 }
 
 bool set_su_enabled(bool enabled) {
     struct ksu_set_feature_cmd cmd = {};
     cmd.feature_id = KSU_FEATURE_SU_COMPAT;
     cmd.value = enabled ? 1 : 0;
-    return ksuctl(KSU_IOCTL_SET_FEATURE, &cmd) == 0;
+    if (ksuctl(KSU_IOCTL_SET_FEATURE, &cmd) == 0) {
+        return true;
+    }
+    return legacy_set_su_enabled(enabled);
 }
 
 bool is_su_enabled() {
     struct ksu_get_feature_cmd cmd = {};
     cmd.feature_id = KSU_FEATURE_SU_COMPAT;
-    if (ksuctl(KSU_IOCTL_GET_FEATURE, &cmd) != 0) {
+    if (ksuctl(KSU_IOCTL_GET_FEATURE, &cmd) == 0 && cmd.supported) {
-        return false;
-    }
-    if (!cmd.supported) {
-        return false;
-    }
         return cmd.value != 0;
+    }
+    return legacy_is_su_enabled();
 }
 
 static inline bool get_feature(uint32_t feature_id, uint64_t *out_value, bool *out_supported) {
@@ -196,7 +214,7 @@ bool is_kernel_umount_enabled() {
     }
     return value != 0;
 }
-
+// 1. 获取完整版本名称
 void get_full_version(char* buff) {
 	struct ksu_get_full_version_cmd cmd = {0};
 	if (ksuctl(KSU_IOCTL_GET_FULL_VERSION, &cmd) == 0) {
@@ -207,24 +225,23 @@ void get_full_version(char* buff) {
 	}
 }
 
-void legacy_get_full_version(char* buff) {
+// 2. 获取KPM启用状态
-    ksuctl_prctl(CMD_GET_VERSION_FULL, buff, NULL);
+bool is_KPM_enable(void) {
-}
-
-bool is_KPM_enable(void)
-{
     struct ksu_enable_kpm_cmd cmd = {};
-	return ksuctl(KSU_IOCTL_ENABLE_KPM, &cmd) == 0 && cmd.enabled;
+    if (ksuctl(KSU_IOCTL_ENABLE_KPM, &cmd) == 0 && cmd.enabled) {
+        return true;
+    }
+    return legacy_is_KPM_enable();
 }
 
-void get_hook_type(char *buff)
+// 3. 获取钩子类型
-{
+void get_hook_type(char *buff) {
     struct ksu_hook_type_cmd cmd = {0};
     if (ksuctl(KSU_IOCTL_HOOK_TYPE, &cmd) == 0) {
         strncpy(buff, cmd.hook_type, 32 - 1);
         buff[32 - 1] = '\0';
     } else {
-		strcpy(buff, "Unknown");
+        legacy_get_hook_type(buff, 32);
     }
 }
 
@@ -272,6 +289,34 @@ bool get_managers_list(struct manager_list_info *info)
 	return true;
 }
 
+bool is_uid_scanner_enabled(void)
+{
+	bool status = false;
+
+	struct ksu_enable_uid_scanner_cmd cmd = {
+			.operation  = UID_SCANNER_OP_GET_STATUS,
+			.status_ptr = (__u64)(uintptr_t)&status
+	};
+
+	return ksuctl(KSU_IOCTL_ENABLE_UID_SCANNER, &cmd) == 0 != 0 && status;
+}
+
+bool set_uid_scanner_enabled(bool enabled)
+{
+	struct ksu_enable_uid_scanner_cmd cmd = {
+			.operation = UID_SCANNER_OP_TOGGLE,
+			.enabled   = enabled
+	};
+	return ksuctl(KSU_IOCTL_ENABLE_UID_SCANNER, &cmd);
+}
+
+bool clear_uid_scanner_environment(void)
+{
+	struct ksu_enable_uid_scanner_cmd cmd = {
+			.operation = UID_SCANNER_OP_CLEAR_ENV
+	};
+	return ksuctl(KSU_IOCTL_ENABLE_UID_SCANNER, &cmd);
+}
 
 bool verify_module_signature(const char* input) {
 #if defined(__aarch64__) || defined(_M_ARM64) || defined(__arm__) || defined(_M_ARM)
@@ -329,32 +374,3 @@ bool verify_module_signature(const char* input) {
 	return false;
 #endif
 }
-
-bool is_uid_scanner_enabled(void)
-{
-	bool status = false;
-
-	struct ksu_enable_uid_scanner_cmd cmd = {
-			.operation  = UID_SCANNER_OP_GET_STATUS,
-			.status_ptr = (__u64)(uintptr_t)&status
-	};
-
-	return ksuctl(KSU_IOCTL_ENABLE_UID_SCANNER, &cmd) == 0 != 0 && status;
-}
-
-bool set_uid_scanner_enabled(bool enabled)
-{
-	struct ksu_enable_uid_scanner_cmd cmd = {
-			.operation = UID_SCANNER_OP_TOGGLE,
-			.enabled   = enabled
-	};
-	return ksuctl(KSU_IOCTL_ENABLE_UID_SCANNER, &cmd);
-}
-
-bool clear_uid_scanner_environment(void)
-{
-	struct ksu_enable_uid_scanner_cmd cmd = {
-			.operation = UID_SCANNER_OP_CLEAR_ENV
-	};
-	return ksuctl(KSU_IOCTL_ENABLE_UID_SCANNER, &cmd);
-}

manager/app/src/main/cpp/ksu.h

@@ -12,40 +12,6 @@
 #include <sys/prctl.h>
 #include <sys/syscall.h>
 
-#define KERNEL_SU_OPTION 0xDEADBEEF
-
-#define CMD_GRANT_ROOT 0
-
-#define CMD_BECOME_MANAGER 1
-#define CMD_GET_VERSION 2
-#define CMD_ALLOW_SU 3
-#define CMD_DENY_SU 4
-#define CMD_GET_SU_LIST 5
-#define CMD_GET_DENY_LIST 6
-#define CMD_CHECK_SAFEMODE 9
-
-#define CMD_GET_APP_PROFILE 10
-#define CMD_SET_APP_PROFILE 11
-
-#define CMD_IS_UID_GRANTED_ROOT 12
-#define CMD_IS_UID_SHOULD_UMOUNT 13
-#define CMD_IS_SU_ENABLED 14
-#define CMD_ENABLE_SU 15
-
-#define CMD_GET_VERSION_FULL 0xC0FFEE1A
-
-#define CMD_ENABLE_KPM 100
-#define CMD_HOOK_TYPE 101
-#define CMD_DYNAMIC_MANAGER 103
-#define CMD_GET_MANAGERS 104
-#define CMD_ENABLE_UID_SCANNER 105
-
-static inline bool ksuctl_prctl(int cmd, void* arg1, void* arg2) {
-    int32_t result = 0;
-    int32_t rtn = prctl(KERNEL_SU_OPTION, cmd, arg1, arg2, &result);
-    return result == KERNEL_SU_OPTION && rtn == -1;
-}
-
 #define KSU_FULL_VERSION_STRING 255
 
 uint32_t get_version();
@@ -59,7 +25,6 @@ bool is_lkm_mode();
 bool is_manager();
 
 void get_full_version(char* buff);
-void legacy_get_full_version(char* buff);
 
 #define KSU_APP_PROFILE_VER 2
 #define KSU_MAX_PACKAGE_NAME 256
@@ -296,6 +261,7 @@ struct ksu_enable_uid_scanner_cmd {
 
 bool get_allow_list(struct ksu_get_allow_list_cmd *);
 
+// Legacy Compatible
 struct ksu_version_info legacy_get_info();
 
 struct ksu_version_info {
@@ -303,4 +269,22 @@ struct ksu_version_info {
     int32_t flags;
 };
 
+bool legacy_get_allow_list(int *uids, int *size);
+bool legacy_is_safe_mode();
+bool legacy_uid_should_umount(int uid);
+bool legacy_set_app_profile(const struct app_profile* profile);
+bool legacy_get_app_profile(char* key, struct app_profile* profile);
+bool legacy_set_su_enabled(bool enabled);
+bool legacy_is_su_enabled();
+bool legacy_is_KPM_enable();
+bool legacy_get_hook_type(char* hook_type, size_t size);
+void legacy_get_full_version(char* buff);
+bool legacy_set_dynamic_manager(unsigned int size, const char* hash);
+bool legacy_get_dynamic_manager(struct dynamic_manager_user_config* config);
+bool legacy_clear_dynamic_manager();
+bool legacy_get_managers_list(struct manager_list_info* info);
+bool legacy_is_uid_scanner_enabled();
+bool legacy_set_uid_scanner_enabled(bool enabled);
+bool legacy_clear_uid_scanner_environment();
+
 #endif //KERNELSU_KSU_H

manager/app/src/main/cpp/legacy.c

@@ -0,0 +1,163 @@
+//
+// Created by shirkneko on 2025/11/3.
+//
+// Legacy Compatible
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <android/log.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include "prelude.h"
+#include "ksu.h"
+
+#define KERNEL_SU_OPTION 0xDEADBEEF
+
+#define CMD_GRANT_ROOT 0
+
+#define CMD_BECOME_MANAGER 1
+#define CMD_GET_VERSION 2
+#define CMD_ALLOW_SU 3
+#define CMD_DENY_SU 4
+#define CMD_GET_SU_LIST 5
+#define CMD_GET_DENY_LIST 6
+#define CMD_CHECK_SAFEMODE 9
+
+#define CMD_GET_APP_PROFILE 10
+#define CMD_SET_APP_PROFILE 11
+
+#define CMD_IS_UID_GRANTED_ROOT 12
+#define CMD_IS_UID_SHOULD_UMOUNT 13
+#define CMD_IS_SU_ENABLED 14
+#define CMD_ENABLE_SU 15
+
+#define CMD_GET_VERSION_FULL 0xC0FFEE1A
+
+#define CMD_ENABLE_KPM 100
+#define CMD_HOOK_TYPE 101
+#define CMD_DYNAMIC_MANAGER 103
+#define CMD_GET_MANAGERS 104
+#define CMD_ENABLE_UID_SCANNER 105
+
+static bool ksuctl(int cmd, void* arg1, void* arg2) {
+    int32_t result = 0;
+    int32_t rtn = prctl(KERNEL_SU_OPTION, cmd, arg1, arg2, &result);
+    return result == KERNEL_SU_OPTION && rtn == -1;
+}
+
+struct ksu_version_info legacy_get_info()
+{
+    int32_t version = -1;
+    int32_t flags = 0;
+    ksuctl(CMD_GET_VERSION, &version, &flags);
+    return (struct ksu_version_info){version, flags};
+}
+
+bool legacy_get_allow_list(int *uids, int *size) {
+    return ksuctl(CMD_GET_SU_LIST, uids, size);
+}
+
+bool legacy_is_safe_mode() {
+    return ksuctl(CMD_CHECK_SAFEMODE, NULL, NULL);
+}
+
+bool legacy_uid_should_umount(int uid) {
+    int should;
+    return ksuctl(CMD_IS_UID_SHOULD_UMOUNT, (void*) ((size_t) uid), &should) && should;
+}
+
+bool legacy_set_app_profile(const struct app_profile* profile) {
+    return ksuctl(CMD_SET_APP_PROFILE, (void*) profile, NULL);
+}
+
+bool legacy_get_app_profile(char* key, struct app_profile* profile) {
+    return ksuctl(CMD_GET_APP_PROFILE, profile, NULL);
+}
+
+bool legacy_set_su_enabled(bool enabled) {
+    return ksuctl(CMD_ENABLE_SU, (void*) enabled, NULL);
+}
+
+bool legacy_is_su_enabled() {
+    int enabled = true;
+    // if ksuctl failed, we assume su is enabled, and it cannot be disabled.
+    ksuctl(CMD_IS_SU_ENABLED, &enabled, NULL);
+    return enabled;
+}
+
+bool legacy_is_KPM_enable() {
+    int enabled = false;
+    ksuctl(CMD_ENABLE_KPM, &enabled, NULL);
+    return enabled;
+}
+
+bool legacy_get_hook_type(char* hook_type, size_t size) {
+    if (hook_type == NULL || size == 0) {
+        return false;
+    }
+
+    static char cached_hook_type[16] = {0};
+    if (cached_hook_type[0] == '\0') {
+        if (!ksuctl(CMD_HOOK_TYPE, cached_hook_type, NULL)) {
+            strcpy(cached_hook_type, "Unknown");
+        }
+    }
+
+    strncpy(hook_type, cached_hook_type, size - 1);
+    hook_type[size - 1] = '\0';
+    return true;
+}
+
+void legacy_get_full_version(char* buff) {
+    ksuctl(CMD_GET_VERSION_FULL, buff, NULL);
+}
+
+bool legacy_set_dynamic_manager(unsigned int size, const char* hash) {
+    if (hash == NULL) {
+        return false;
+    }
+    struct dynamic_manager_user_config config;
+    config.operation = DYNAMIC_MANAGER_OP_SET;
+    config.size = size;
+    strncpy(config.hash, hash, sizeof(config.hash) - 1);
+    config.hash[sizeof(config.hash) - 1] = '\0';
+    return ksuctl(CMD_DYNAMIC_MANAGER, &config, NULL);
+}
+
+bool legacy_get_dynamic_manager(struct dynamic_manager_user_config* config) {
+    if (config == NULL) {
+        return false;
+    }
+    config->operation = DYNAMIC_MANAGER_OP_GET;
+    return ksuctl(CMD_DYNAMIC_MANAGER, config, NULL);
+}
+
+bool legacy_clear_dynamic_manager() {
+    struct dynamic_manager_user_config config;
+    config.operation = DYNAMIC_MANAGER_OP_CLEAR;
+    return ksuctl(CMD_DYNAMIC_MANAGER, &config, NULL);
+}
+
+bool legacy_get_managers_list(struct manager_list_info* info) {
+    if (info == NULL) {
+        return false;
+    }
+    return ksuctl(CMD_GET_MANAGERS, info, NULL);
+}
+
+bool legacy_is_uid_scanner_enabled() {
+    bool status = false;
+    ksuctl(CMD_ENABLE_UID_SCANNER, (void*)0, &status);
+    return status;
+}
+
+bool legacy_set_uid_scanner_enabled(bool enabled) {
+    return ksuctl(CMD_ENABLE_UID_SCANNER, (void*)1, (void*)enabled);
+}
+
+bool legacy_clear_uid_scanner_environment() {
+    return ksuctl(CMD_ENABLE_UID_SCANNER, (void*)2, NULL);
+}