kernel: Remove prctl; use netlink communication to control manual_su

kernel/Makefile

@@ -12,6 +12,7 @@ kernelsu-objs += embed_ksud.o
 kernelsu-objs += kernel_compat.o
 kernelsu-objs += throne_comm.o
 kernelsu-objs += sulog.o
+kernelsu-objs += ksu_netlink.o
 
 ifeq ($(CONFIG_KSU_MANUAL_SU), y)
 ccflags-y += -DCONFIG_KSU_MANUAL_SU
@@ -199,7 +200,7 @@ endif
 $(info -- Supported Unofficial Manager: 5ec1cff (GKI) rsuntk (Non-GKI) ShirkNeko udochina (GKI and non-GKI and KPM))
 
 ccflags-y += -Wno-implicit-function-declaration -Wno-strict-prototypes -Wno-int-conversion -Wno-gcc-compat
-ccflags-y += -Wno-declaration-after-statement -Wno-unused-function
+ccflags-y += -Wno-declaration-after-statement -Wno-unused-function -Wno-unused-variable
 
 ## For susfs stuff ##
 ifeq ($(shell test -e $(srctree)/fs/susfs.c; echo $$?),0)

kernel/core_hook.c

@@ -61,13 +61,6 @@
 #include "supercalls.h"
 #include "sulog.h"
 
-#ifdef CONFIG_KSU_MANUAL_SU
-#include "manual_su.h"
-#endif
-
-#ifdef CONFIG_KPM
-#include "kpm/kpm.h"
-#endif
 
 #ifdef CONFIG_KSU_SUSFS
 bool susfs_is_boot_completed_triggered = false;
@@ -516,9 +509,6 @@ static void sulog_prctl_cmd(uid_t uid, unsigned long cmd)
     const char *name = NULL;
 
     switch (cmd) {
-#ifdef CONFIG_KSU_MANUAL_SU
-    case CMD_MANUAL_SU_REQUEST:             name = "prctl_manual_su_request"; break;
-#endif
 
 #ifdef CONFIG_KSU_SUSFS
     case CMD_SUSFS_ADD_SUS_PATH:            name = "prctl_susfs_add_sus_path"; break;
@@ -559,21 +549,11 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
              unsigned long arg4, unsigned long arg5)
 {
 
-    bool is_manual_su_cmd = false;
-#ifdef CONFIG_KSU_MANUAL_SU
-    is_manual_su_cmd = (arg2 == CMD_MANUAL_SU_REQUEST);
-#endif
 
 #ifdef CONFIG_KSU_SUSFS
-    bool saved_umount_flag = false;
-#ifdef CONFIG_KSU_MANUAL_SU
-    if (is_manual_su_cmd || is_system_uid()) {
-        saved_umount_flag = test_and_clear_ti_thread_flag(&current->thread_info, TIF_PROC_UMOUNTED);
-    }
-#endif
     // - We straight up check if process is supposed to be umounted, return 0 if so
     // - This is to prevent side channel attack as much as possible
-    if (likely(!saved_umount_flag && susfs_is_current_proc_umounted()))
+    if (likely(susfs_is_current_proc_umounted()))
         return 0;
 #endif
 
@@ -604,18 +584,6 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
     pr_info("option: 0x%x, cmd: %ld\n", option, arg2);
 #endif
 
-    #ifdef CONFIG_KPM
-    if(sukisu_is_kpm_control_code(arg2)) {
-        int res;
-
-        pr_info("KPM: calling before arg2=%d\n", (int) arg2);
-        
-        res = sukisu_handle_kpm(arg2, arg3, arg4, arg5);
-
-        return 0;
-    }
-#endif
-
 #ifdef CONFIG_KSU_MANUAL_SU
     if (arg2 == CMD_MANUAL_SU_REQUEST) {
         struct manual_su_request request;
@@ -858,11 +826,6 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
     }
 #endif //#ifdef CONFIG_KSU_SUSFS
 
-#if defined(CONFIG_KSU_SUSFS) && defined(CONFIG_KSU_MANUAL_SU)
-    if (unlikely(saved_umount_flag))
-        set_ti_thread_flag(&current->thread_info, TIF_PROC_UMOUNTED);
-#endif
-
     return 0;
 }
 
@@ -1654,6 +1617,7 @@ void __init ksu_core_init(void)
     if (ksu_register_feature_handler(&kernel_umount_handler)) {
         pr_err("Failed to register umount feature handler\n");
     }
+    ksu_netlink_init();
 }
 
 void ksu_core_exit(void)
@@ -1669,4 +1633,5 @@ void ksu_core_exit(void)
     ksu_kprobe_exit();
 #endif
     ksu_unregister_feature_handler(KSU_FEATURE_KERNEL_UMOUNT);
+    ksu_netlink_exit();
 }

kernel/ksu.h

@@ -9,10 +9,6 @@
 
 extern bool ksu_uid_scanner_enabled;
 
-#ifdef CONFIG_KSU_MANUAL_SU
-#define CMD_MANUAL_SU_REQUEST 50
-#endif
-
 #define EVENT_POST_FS_DATA 1
 #define EVENT_BOOT_COMPLETED 2
 #define EVENT_MODULE_MOUNTED 3

kernel/ksu_netlink.c

@@ -0,0 +1,119 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <linux/slab.h>
+#include "ksu_netlink.h"
+#include "manual_su.h"
+#include "ksu.h"
+
+static struct sock *ksu_nl_sock = NULL;
+
+extern int ksu_handle_manual_su_request(int option, struct manual_su_request *request);
+
+static void ksu_netlink_recv_msg(struct sk_buff *skb)
+{
+    struct nlmsghdr *nlh;
+    struct ksu_netlink_msg *msg;
+    struct ksu_netlink_msg reply;
+    struct sk_buff *skb_out;
+    int msg_size;
+    int res;
+    u32 pid;
+
+    if (!skb) {
+        pr_err("ksu_netlink: received NULL skb\n");
+        return;
+    }
+
+    nlh = (struct nlmsghdr *)skb->data;
+    pid = nlh->nlmsg_pid;
+
+    if (!nlh || nlh->nlmsg_len < NLMSG_HDRLEN + sizeof(struct ksu_netlink_msg)) {
+        pr_err("ksu_netlink: invalid message size\n");
+        return;
+    }
+
+    msg = (struct ksu_netlink_msg *)nlmsg_data(nlh);
+
+    if (msg->cmd != KSU_NETLINK_CMD_MANUAL_SU) {
+        pr_warn("ksu_netlink: unknown command %d\n", msg->cmd);
+        return;
+    }
+
+    pr_info("ksu_netlink: received manual_su request, option=%d, uid=%d, pid=%d\n",
+            msg->option, msg->target_uid, msg->target_pid);
+
+    memset(&reply, 0, sizeof(reply));
+    reply.cmd = msg->cmd;
+    reply.option = msg->option;
+    reply.target_uid = msg->target_uid;
+    reply.target_pid = msg->target_pid;
+
+    struct manual_su_request request = {
+        .target_uid = msg->target_uid,
+        .target_pid = msg->target_pid
+    };
+
+    if (msg->option == MANUAL_SU_OP_GENERATE_TOKEN || 
+        msg->option == MANUAL_SU_OP_ESCALATE) {
+        memcpy(request.token_buffer, msg->token_buffer, KSU_TOKEN_LENGTH + 1);
+    }
+
+    res = ksu_handle_manual_su_request(msg->option, &request);
+
+    reply.result = res;
+    if (msg->option == MANUAL_SU_OP_GENERATE_TOKEN && res == 0) {
+        memcpy(reply.token_buffer, request.token_buffer, KSU_TOKEN_LENGTH + 1);
+    }
+
+    msg_size = sizeof(struct ksu_netlink_msg);
+    skb_out = nlmsg_new(msg_size, GFP_KERNEL);
+    if (!skb_out) {
+        pr_err("ksu_netlink: failed to allocate reply skb\n");
+        return;
+    }
+
+    nlh = nlmsg_put(skb_out, 0, 0, NLMSG_DONE, msg_size, 0);
+    if (!nlh) {
+        pr_err("ksu_netlink: nlmsg_put failed\n");
+        kfree_skb(skb_out);
+        return;
+    }
+
+    NETLINK_CB(skb_out).dst_group = 0;
+    memcpy(nlmsg_data(nlh), &reply, sizeof(reply));
+
+    res = nlmsg_unicast(ksu_nl_sock, skb_out, pid);
+    if (res < 0) {
+        pr_err("ksu_netlink: failed to send reply: %d\n", res);
+    } else {
+        pr_info("ksu_netlink: reply sent successfully\n");
+    }
+}
+
+int ksu_netlink_init(void)
+{
+    struct netlink_kernel_cfg cfg = {
+        .input = ksu_netlink_recv_msg,
+    };
+
+    ksu_nl_sock = netlink_kernel_create(&init_net, KSU_NETLINK_PROTOCOL, &cfg);
+    if (!ksu_nl_sock) {
+        pr_err("ksu_netlink: failed to create netlink socket\n");
+        return -ENOMEM;
+    }
+
+    pr_info("ksu_netlink: initialized with protocol %d\n", KSU_NETLINK_PROTOCOL);
+    return 0;
+}
+
+void ksu_netlink_exit(void)
+{
+    if (ksu_nl_sock) {
+        netlink_kernel_release(ksu_nl_sock);
+        ksu_nl_sock = NULL;
+        pr_info("ksu_netlink: released\n");
+    }
+}

kernel/ksu_netlink.h

@@ -0,0 +1,23 @@
+#ifndef __KSU_NETLINK_H
+#define __KSU_NETLINK_H
+
+#include <linux/netlink.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+
+#define KSU_NETLINK_PROTOCOL 2
+#define KSU_NETLINK_CMD_MANUAL_SU 50
+
+struct ksu_netlink_msg {
+    int cmd;
+    int option;
+    uid_t target_uid;
+    pid_t target_pid;
+    char token_buffer[33];
+    int result;
+};
+
+int ksu_netlink_init(void);
+void ksu_netlink_exit(void);
+
+#endif

kernel/throne_tracker.c

@@ -430,11 +430,11 @@ void track_throne(void)
 {
     struct list_head uid_list;
     struct uid_data *np, *n;
-    __maybe_unused struct file *fp;
+     struct file *fp;
-    __maybe_unused char chr = 0;
+    char chr = 0;
-    __maybe_unused loff_t pos = 0;
+    loff_t pos = 0;
-    __maybe_unused loff_t line_start = 0;
+    loff_t line_start = 0;
-    __maybe_unused char buf[KSU_MAX_PACKAGE_NAME];
+    char buf[KSU_MAX_PACKAGE_NAME];
     static bool manager_exist = false;
     static bool dynamic_manager_exist = false;
     int current_manager_uid = ksu_get_manager_uid() % 100000;