SukiSU-Ultra/kernel/allowlist.c

#include "linux/uidgid.h"
#include <linux/cpu.h>
#include <linux/memory.h>
#include <linux/uaccess.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/printk.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <asm-generic/errno-base.h>

#include <linux/rcupdate.h>
#include <linux/fdtable.h>
#include <linux/fs.h> 
#include <linux/fs_struct.h>
#include <linux/namei.h>

#include <linux/delay.h> // msleep

#include "klog.h"

struct perm_data {
	struct list_head list;
	uid_t uid;
	bool allow;
};

static struct list_head allow_list;

#define KERNEL_SU_DIR "/data/adb/kernelsu"

static struct workqueue_struct *ksu_workqueue;
static struct work_struct ksu_save_work;
static struct work_struct ksu_load_work;

bool persistent_allow_list();

bool ksu_allow_uid(uid_t uid, bool allow) {

	// find the node first!
	struct perm_data* p;
	struct list_head* pos;
	bool result;
	list_for_each(pos, &allow_list) {
        p = list_entry(pos, struct perm_data, list);
        pr_info("ksu_allow_uid :%d, allow: %d\n", p->uid, p->allow);
		if (uid == p->uid) {
			p->allow = allow;
			result = true;
			goto exit;
		}
    }

	// not found, alloc a new node!
	p = (struct perm_data*) kmalloc(sizeof(struct perm_data), GFP_KERNEL);
	if (!p) {
		pr_err("alloc allow node failed.\n");
		return false;
	}
	p->uid = uid;
	p->allow = allow;

	list_add_tail(&p->list, &allow_list);
	result = true;

exit:

	persistent_allow_list();

	return result;
}

bool ksu_is_allow_uid(uid_t uid) {
	struct perm_data* p;
	struct list_head* pos;
	list_for_each(pos, &allow_list) {
        p = list_entry(pos, struct perm_data, list);
        pr_info("uid :%d, allow: %d\n", p->uid, p->allow);
		if (uid == p->uid) {
			return p->allow;
		}
    }

	return false;
}

bool ksu_get_allow_list(int* array, int* length, bool allow) {
	struct perm_data* p;
	struct list_head* pos;
	int i = 0;
	list_for_each(pos, &allow_list) {
        p = list_entry(pos, struct perm_data, list);
        pr_info("uid: %d allow: %d\n", p->uid, p->allow);
		if (p->allow == allow) {
			array[i++] = p->uid;
		}
    }
	*length = i;

	return true;
}





void do_persistent_allow_list(struct work_struct *work)
{
	struct perm_data* p;
	struct list_head* pos;
	loff_t off;

	struct file* fp = filp_open("/data/adb/ksu_list", O_WRONLY|O_CREAT, 0644);

	if (IS_ERR(fp)) {
		pr_err("work creat file failed: %d\n", PTR_ERR(fp));
		return;
	}
	pr_info("work create file success!\n");

	list_for_each(pos, &allow_list) {
        p = list_entry(pos, struct perm_data, list);
        pr_info("uid :%d, allow: %d\n", p->uid, p->allow);
		kernel_write(fp, &p->uid, sizeof(p->uid), &off);
		kernel_write(fp, &p->allow, sizeof(p->allow), &off);
    }

	filp_close(fp, 0);
}

void do_load_allow_list(struct work_struct *work) {

	loff_t off;
	ssize_t ret;
	struct file* fp;

	fp = filp_open("/data/adb/", O_RDONLY, 0);
	if (IS_ERR(fp)) {
		pr_err("work open '/data/adb' failed: %d\n", PTR_ERR(fp));
		mdelay(2000);

		queue_work(ksu_workqueue, &ksu_load_work);
		return;
	}
	filp_close(fp, 0);

	// load allowlist now!
	fp = filp_open("/data/adb/ksu_list", O_RDONLY, 0);

	if (IS_ERR(fp)) {
		pr_err("work open file failed: %d\n", PTR_ERR(fp));
		return;
	}
	pr_info("work open file success!\n");

	while (true) {
		u32 uid;
		bool allow;
		ret = kernel_read(fp, &uid, sizeof(uid), &off);
        pr_info("kernel read ret: %d, off: %ld\n", ret, off);
		if (ret <= 0) {
			pr_info("read err: %d\n", ret);
			break;
		}
		ret = kernel_read(fp, &allow, sizeof(allow), &off);

        pr_info("load_allow_uid: %d, allow: %d\n", uid, allow);

		ksu_allow_uid(uid, allow);
	}

	filp_close(fp, 0);
}

static int init_work(void) {
    ksu_workqueue = alloc_workqueue("kernelsu_work", 0, 0);
    INIT_WORK(&ksu_save_work, do_persistent_allow_list);
    INIT_WORK(&ksu_load_work, do_load_allow_list);
    return 0;
}

// make sure allow list works cross boot
bool persistent_allow_list() {
	queue_work(ksu_workqueue, &ksu_save_work);
	return true;
}

bool load_allow_list() {
	queue_work(ksu_workqueue, &ksu_load_work);
	return true;
}

bool ksu_allowlist_init() {

    INIT_LIST_HEAD(&allow_list);

	init_work();

	// load_allow_list();

    return true;
}

bool ksu_allowlist_exit() {

	destroy_workqueue(ksu_workqueue);

    return true;
}