mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-23 12:51:13 +00:00
110 lines
3.9 KiB
C++
110 lines
3.9 KiB
C++
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <switch.h>
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#include <cstring>
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#include <stratosphere.hpp>
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#include "fsmitm_boot0storage.hpp"
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static sts::os::Mutex g_boot0_mutex;
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static u8 g_boot0_bct_buffer[Boot0Storage::BctEndOffset];
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bool Boot0Storage::CanModifyBctPubks() {
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if (IsRcmBugPatched()) {
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/* RCM bug patched. */
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/* Only allow NS to update the BCT pubks. */
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/* AutoRCM on a patched unit will cause a brick, so homebrew should NOT be allowed to write. */
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return this->title_id == sts::ncm::TitleId::Ns;
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} else {
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/* RCM bug unpatched. */
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/* Allow homebrew but not NS to update the BCT pubks. */
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return this->title_id != sts::ncm::TitleId::Ns;
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}
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}
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Result Boot0Storage::Read(void *_buffer, size_t size, u64 offset) {
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std::scoped_lock lk{g_boot0_mutex};
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return Base::Read(_buffer, size, offset);
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}
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Result Boot0Storage::Write(void *_buffer, size_t size, u64 offset) {
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std::scoped_lock lk{g_boot0_mutex};
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u8 *buffer = static_cast<u8 *>(_buffer);
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/* Protect the keyblob region from writes. */
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if (offset <= EksStart) {
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if (offset + size < EksStart) {
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/* Fall through, no need to do anything here. */
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} else {
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if (offset + size < EksEnd) {
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/* Adjust size to avoid writing end of data. */
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size = EksStart - offset;
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} else {
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/* Perform portion of write falling past end of keyblobs. */
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const u64 diff = EksEnd - offset;
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R_TRY(Base::Write(buffer + diff, size - diff, EksEnd));
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/* Adjust size to avoid writing end of data. */
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size = EksStart - offset;
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}
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}
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} else {
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if (offset < EksEnd) {
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if (offset + size < EksEnd) {
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/* Ignore writes falling strictly within the region. */
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return ResultSuccess;
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} else {
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/* Only write past the end of the keyblob region. */
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buffer = buffer + (EksEnd - offset);
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size -= (EksEnd - offset);
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offset = EksEnd;
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}
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} else {
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/* Fall through, no need to do anything here. */
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}
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}
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if (size == 0) {
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return ResultSuccess;
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}
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/* We care about protecting autorcm from NS. */
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if (CanModifyBctPubks() || offset >= BctEndOffset || (offset + BctSize >= BctEndOffset && offset % BctSize >= BctPubkEnd)) {
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return Base::Write(buffer, size, offset);
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}
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/* First, let's deal with the data past the end. */
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if (offset + size >= BctEndOffset) {
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const u64 diff = BctEndOffset - offset;
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R_TRY(ProxyStorage::Write(buffer + diff, size - diff, BctEndOffset));
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size = diff;
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}
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/* Read in the current BCT region. */
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R_TRY(ProxyStorage::Read(g_boot0_bct_buffer, BctEndOffset, 0));
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/* Update the bct buffer. */
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for (u64 cur_ofs = offset; cur_ofs < BctEndOffset && cur_ofs < offset + size; cur_ofs++) {
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const u64 cur_bct_rel_ofs = cur_ofs % BctSize;
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if (cur_bct_rel_ofs < BctPubkStart || BctPubkEnd <= cur_bct_rel_ofs) {
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g_boot0_bct_buffer[cur_ofs] = buffer[cur_ofs - offset];
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}
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}
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return ProxyStorage::Write(g_boot0_bct_buffer, BctEndOffset, 0);
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}
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