Picklock_RCM/source/hos/pkg2.c

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/*
* Copyright (c) 2018 naehrwert
* Copyright (c) 2018-2020 CTCaer
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* Copyright (c) 2018 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <string.h>
#include "pkg2.h"
#include "../utils/aarch64_util.h"
#include "../mem/heap.h"
#include "../sec/se.h"
#include "../libs/compr/blz.h"
#include "../gfx/gfx.h"
u32 pkg2_newkern_ini1_val;
u32 pkg2_newkern_ini1_start;
u32 pkg2_newkern_ini1_end;
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/*#include "util.h"
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#define DPRINTF(...) gfx_printf(__VA_ARGS__)
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#define DEBUG_PRINTING*/
#define DPRINTF(...)
static u32 _pkg2_calc_kip1_size(pkg2_kip1_t *kip1)
{
u32 size = sizeof(pkg2_kip1_t);
for (u32 j = 0; j < KIP1_NUM_SECTIONS; j++)
size += kip1->sections[j].size_comp;
return size;
}
void pkg2_get_newkern_info(u8 *kern_data)
{
u32 pkg2_newkern_ini1_off = 0;
pkg2_newkern_ini1_start = 0;
// Find static OP offset that is close to INI1 offset.
u32 counter_ops = 0x100;
while (counter_ops)
{
if (*(u32 *)(kern_data + 0x100 - counter_ops) == PKG2_NEWKERN_GET_INI1_HEURISTIC)
{
pkg2_newkern_ini1_off = 0x100 - counter_ops + 12; // OP found. Add 12 for the INI1 offset.
break;
}
counter_ops -= 4;
}
// Offset not found?
if (!counter_ops)
return;
u32 info_op = *(u32 *)(kern_data + pkg2_newkern_ini1_off);
pkg2_newkern_ini1_val = ((info_op & 0xFFFF) >> 3) + pkg2_newkern_ini1_off; // Parse ADR and PC.
pkg2_newkern_ini1_start = *(u32 *)(kern_data + pkg2_newkern_ini1_val);
pkg2_newkern_ini1_end = *(u32 *)(kern_data + pkg2_newkern_ini1_val + 0x8);
}
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bool pkg2_parse_kips(link_t *info, pkg2_hdr_t *pkg2, bool *new_pkg2)
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{
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u8 *ptr;
// Check for new pkg2 type.
if (!pkg2->sec_size[PKG2_SEC_INI1])
{
pkg2_get_newkern_info(pkg2->data);
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if (!pkg2_newkern_ini1_start)
return false;
ptr = pkg2->data + pkg2_newkern_ini1_start;
*new_pkg2 = true;
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}
else
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ptr = pkg2->data + pkg2->sec_size[PKG2_SEC_KERNEL];
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pkg2_ini1_t *ini1 = (pkg2_ini1_t *)ptr;
ptr += sizeof(pkg2_ini1_t);
for (u32 i = 0; i < ini1->num_procs; i++)
{
pkg2_kip1_t *kip1 = (pkg2_kip1_t *)ptr;
pkg2_kip1_info_t *ki = (pkg2_kip1_info_t *)malloc(sizeof(pkg2_kip1_info_t));
ki->kip1 = kip1;
ki->size = _pkg2_calc_kip1_size(kip1);
list_append(info, &ki->link);
ptr += ki->size;
DPRINTF(" kip1 %d:%s @ %08X (%08X)\n", i, kip1->name, (u32)kip1, ki->size);
}
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return true;
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}
int pkg2_decompress_kip(pkg2_kip1_info_t* ki, u32 sectsToDecomp)
{
u32 compClearMask = ~sectsToDecomp;
if ((ki->kip1->flags & compClearMask) == ki->kip1->flags)
return 0; // Already decompressed, nothing to do.
pkg2_kip1_t hdr;
memcpy(&hdr, ki->kip1, sizeof(hdr));
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unsigned int newKipSize = sizeof(hdr);
for (u32 sectIdx = 0; sectIdx < KIP1_NUM_SECTIONS; sectIdx++)
{
u32 sectCompBit = 1u << sectIdx;
// For compressed, cant get actual decompressed size without doing it, so use safe "output size".
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if (sectIdx < 3 && (sectsToDecomp & sectCompBit) && (hdr.flags & sectCompBit))
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newKipSize += hdr.sections[sectIdx].size_decomp;
else
newKipSize += hdr.sections[sectIdx].size_comp;
}
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pkg2_kip1_t* newKip = malloc(newKipSize);
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unsigned char* dstDataPtr = newKip->data;
const unsigned char* srcDataPtr = ki->kip1->data;
for (u32 sectIdx = 0; sectIdx < KIP1_NUM_SECTIONS; sectIdx++)
{
u32 sectCompBit = 1u << sectIdx;
// Easy copy path for uncompressed or ones we dont want to uncompress.
if (sectIdx >= 3 || !(sectsToDecomp & sectCompBit) || !(hdr.flags & sectCompBit))
{
unsigned int dataSize = hdr.sections[sectIdx].size_comp;
if (dataSize == 0)
continue;
memcpy(dstDataPtr, srcDataPtr, dataSize);
srcDataPtr += dataSize;
dstDataPtr += dataSize;
continue;
}
unsigned int compSize = hdr.sections[sectIdx].size_comp;
unsigned int outputSize = hdr.sections[sectIdx].size_decomp;
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//gfx_printf("Decomping %s KIP1 sect %d of size %d...\n", (const char*)hdr.name, sectIdx, compSize);
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if (blz_uncompress_srcdest(srcDataPtr, compSize, dstDataPtr, outputSize) == 0)
{
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gfx_printf("%kERROR decomping sect %d of %s KIP!%k\n", 0xFFFF0000, sectIdx, (char*)hdr.name, 0xFFCCCCCC);
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free(newKip);
return 1;
}
else
{
DPRINTF("Done! Decompressed size is %d!\n", outputSize);
}
hdr.sections[sectIdx].size_comp = outputSize;
srcDataPtr += compSize;
dstDataPtr += outputSize;
}
hdr.flags &= compClearMask;
memcpy(newKip, &hdr, sizeof(hdr));
newKipSize = dstDataPtr-(unsigned char*)(newKip);
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free(ki->kip1);
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ki->kip1 = newKip;
ki->size = newKipSize;
return 0;
}
pkg2_hdr_t *pkg2_decrypt(void *data)
{
u8 *pdata = (u8 *)data;
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// Skip signature.
pdata += 0x100;
pkg2_hdr_t *hdr = (pkg2_hdr_t *)pdata;
// Skip header.
pdata += sizeof(pkg2_hdr_t);
// Decrypt header.
se_aes_crypt_ctr(8, hdr, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
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//gfx_hexdump((u32)hdr, hdr, 0x100);
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if (hdr->magic != PKG2_MAGIC)
return NULL;
for (u32 i = 0; i < 4; i++)
{
DPRINTF("sec %d has size %08X\n", i, hdr->sec_size[i]);
if (!hdr->sec_size[i])
continue;
se_aes_crypt_ctr(8, pdata, hdr->sec_size[i], pdata, hdr->sec_size[i], &hdr->sec_ctr[i * 0x10]);
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//gfx_hexdump((u32)pdata, pdata, 0x100);
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pdata += hdr->sec_size[i];
}
return hdr;
}