Atmosphere/stratosphere/ro/source/impl/ro_nro_utils.cpp

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/*
* Copyright (c) 2018-2020 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 "ro_nro_utils.hpp"
namespace ams::ro::impl {
namespace {
constexpr size_t MaxMapRetries = 0x200;
}
Result MapNro(u64 *out_base_address, Handle process_handle, u64 nro_heap_address, u64 nro_heap_size, u64 bss_heap_address, u64 bss_heap_size) {
map::MappedCodeMemory nro_mcm(ResultInternalError{});
map::MappedCodeMemory bss_mcm(ResultInternalError{});
u64 base_address;
/* Map the NRO, and map the BSS immediately after it. */
size_t i;
for (i = 0; i < MaxMapRetries; i++) {
map::MappedCodeMemory tmp_nro_mcm(ResultInternalError{});
R_TRY(map::MapCodeMemoryInProcess(tmp_nro_mcm, process_handle, nro_heap_address, nro_heap_size));
base_address = tmp_nro_mcm.GetDstAddress();
if (bss_heap_size > 0) {
map::MappedCodeMemory tmp_bss_mcm(process_handle, base_address + nro_heap_size, bss_heap_address, bss_heap_size);
R_TRY_CATCH(tmp_bss_mcm.GetResult()) {
R_CATCH(svc::ResultInvalidCurrentMemoryState) {
continue;
}
} R_END_TRY_CATCH;
if (!map::CanAddGuardRegionsInProcess(process_handle, base_address, nro_heap_size + bss_heap_size)) {
continue;
}
bss_mcm = std::move(tmp_bss_mcm);
} else {
if (!map::CanAddGuardRegionsInProcess(process_handle, base_address, nro_heap_size)) {
continue;
}
}
nro_mcm = std::move(tmp_nro_mcm);
break;
}
R_UNLESS(i < MaxMapRetries, ResultOutOfAddressSpace());
/* Invalidation here actually prevents them from unmapping at scope exit. */
nro_mcm.Invalidate();
bss_mcm.Invalidate();
*out_base_address = base_address;
return ResultSuccess();
}
Result SetNroPerms(Handle process_handle, u64 base_address, u64 rx_size, u64 ro_size, u64 rw_size) {
const u64 rx_offset = 0;
const u64 ro_offset = rx_offset + rx_size;
const u64 rw_offset = ro_offset + ro_size;
R_TRY(svcSetProcessMemoryPermission(process_handle, base_address + rx_offset, rx_size, Perm_Rx));
R_TRY(svcSetProcessMemoryPermission(process_handle, base_address + ro_offset, ro_size, Perm_R ));
R_TRY(svcSetProcessMemoryPermission(process_handle, base_address + rw_offset, rw_size, Perm_Rw));
return ResultSuccess();
}
Result UnmapNro(Handle process_handle, u64 base_address, u64 nro_heap_address, u64 bss_heap_address, u64 bss_heap_size, u64 code_size, u64 rw_size) {
/* First, unmap bss. */
if (bss_heap_size > 0) {
R_TRY(svcUnmapProcessCodeMemory(process_handle, base_address + code_size + rw_size, bss_heap_address, bss_heap_size));
}
/* Next, unmap .rwdata */
if (rw_size > 0) {
R_TRY(svcUnmapProcessCodeMemory(process_handle, base_address + code_size, nro_heap_address + code_size, rw_size));
}
/* Finally, unmap .text + .rodata. */
R_TRY(svcUnmapProcessCodeMemory(process_handle, base_address, nro_heap_address, code_size));
return ResultSuccess();
}
}