mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-16 12:52:28 +00:00
108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
/*
|
|
* 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 <switch.h>
|
|
#include <cstring>
|
|
#include <stratosphere.hpp>
|
|
|
|
#include "fsmitm_boot0storage.hpp"
|
|
|
|
static HosMutex g_boot0_mutex;
|
|
static u8 g_boot0_bct_buffer[Boot0Storage::BctEndOffset];
|
|
|
|
bool Boot0Storage::CanModifyBctPubks() {
|
|
return this->title_id != 0x010000000000001FULL;
|
|
}
|
|
|
|
Result Boot0Storage::Read(void *_buffer, size_t size, u64 offset) {
|
|
std::scoped_lock<HosMutex> lk{g_boot0_mutex};
|
|
|
|
return Base::Read(_buffer, size, offset);
|
|
}
|
|
|
|
Result Boot0Storage::Write(void *_buffer, size_t size, u64 offset) {
|
|
std::scoped_lock<HosMutex> lk{g_boot0_mutex};
|
|
|
|
Result rc = 0;
|
|
u8 *buffer = static_cast<u8 *>(_buffer);
|
|
|
|
/* Protect the keyblob region from writes. */
|
|
if (offset <= EksStart) {
|
|
if (offset + size < EksStart) {
|
|
/* Fall through, no need to do anything here. */
|
|
} else {
|
|
if (offset + size < EksEnd) {
|
|
/* Adjust size to avoid writing end of data. */
|
|
size = EksStart - offset;
|
|
} else {
|
|
/* Perform portion of write falling past end of keyblobs. */
|
|
const u64 diff = EksEnd - offset;
|
|
if (R_FAILED((rc = Base::Write(buffer + diff, size - diff, EksEnd)))) {
|
|
return rc;
|
|
}
|
|
/* Adjust size to avoid writing end of data. */
|
|
size = EksStart - offset;
|
|
}
|
|
}
|
|
} else {
|
|
if (offset < EksEnd) {
|
|
if (offset + size < EksEnd) {
|
|
/* Ignore writes falling strictly within the region. */
|
|
return 0;
|
|
} else {
|
|
/* Only write past the end of the keyblob region. */
|
|
buffer = buffer + (EksEnd - offset);
|
|
size -= (EksEnd - offset);
|
|
offset = EksEnd;
|
|
}
|
|
} else {
|
|
/* Fall through, no need to do anything here. */
|
|
}
|
|
}
|
|
|
|
if (size == 0) {
|
|
return 0;
|
|
}
|
|
|
|
/* We care about protecting autorcm from NS. */
|
|
if (CanModifyBctPubks() || offset >= BctEndOffset || (offset + BctSize >= BctEndOffset && offset % BctSize >= BctPubkEnd)) {
|
|
return Base::Write(buffer, size, offset);
|
|
}
|
|
|
|
/* First, let's deal with the data past the end. */
|
|
if (offset + size >= BctEndOffset) {
|
|
const u64 diff = BctEndOffset - offset;
|
|
if (R_FAILED((rc = ProxyStorage::Write(buffer + diff, size - diff, BctEndOffset)))) {
|
|
return rc;
|
|
}
|
|
size -= diff;
|
|
}
|
|
|
|
/* Read in the current BCT region. */
|
|
if (R_FAILED((rc = ProxyStorage::Read(g_boot0_bct_buffer, BctEndOffset, 0)))) {
|
|
return rc;
|
|
}
|
|
|
|
/* Update the bct buffer. */
|
|
for (u64 cur_ofs = offset; cur_ofs < BctEndOffset && cur_ofs < offset + size; cur_ofs++) {
|
|
const u64 cur_bct_rel_ofs = cur_ofs % BctSize;
|
|
if (cur_bct_rel_ofs < BctPubkStart || BctPubkEnd <= cur_bct_rel_ofs) {
|
|
g_boot0_bct_buffer[cur_ofs] = buffer[cur_ofs - offset];
|
|
}
|
|
}
|
|
|
|
return ProxyStorage::Write(g_boot0_bct_buffer, BctEndOffset, 0);
|
|
}
|