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

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/*
* Copyright (c) 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 <stratosphere.hpp>
#include "ro_nro_utils.hpp"
#include "ro_random.hpp"
namespace ams::ro::impl {
namespace {
ALWAYS_INLINE size_t SetupNroProcessMemoryRegions(os::ProcessMemoryRegion *regions, u64 nro_heap_address, u64 nro_heap_size, u64 bss_heap_address, u64 bss_heap_size) {
/* Reset region count. */
size_t num_regions = 0;
/* We always want a region for the nro. */
regions[num_regions++] = { nro_heap_address, nro_heap_size };
/* If we have bss, create a region for bss. */
if (bss_heap_size > 0) {
regions[num_regions++] = { bss_heap_address, bss_heap_size };
}
return num_regions;
}
}
Result MapNro(u64 *out_base_address, os::NativeHandle process_handle, u64 nro_heap_address, u64 nro_heap_size, u64 bss_heap_address, u64 bss_heap_size) {
/* Set up the process memory regions. */
os::ProcessMemoryRegion regions[2];
const size_t num_regions = SetupNroProcessMemoryRegions(regions, nro_heap_address, nro_heap_size, bss_heap_address, bss_heap_size);
/* Re-map the nro/bss as code memory in the destination process. */
R_TRY_CATCH(os::MapProcessCodeMemory(out_base_address, process_handle, regions, num_regions, ro::impl::GenerateSecureRandom)) {
R_CONVERT(os::ResultOutOfAddressSpace, ro::ResultOutOfAddressSpace())
} R_END_TRY_CATCH;
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R_SUCCEED();
}
Result SetNroPerms(os::NativeHandle 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(os::SetProcessMemoryPermission(process_handle, base_address + rx_offset, rx_size, os::MemoryPermission_ReadExecute));
R_TRY(os::SetProcessMemoryPermission(process_handle, base_address + ro_offset, ro_size, os::MemoryPermission_ReadOnly));
R_TRY(os::SetProcessMemoryPermission(process_handle, base_address + rw_offset, rw_size, os::MemoryPermission_ReadWrite));
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R_SUCCEED();
}
Result UnmapNro(os::NativeHandle process_handle, u64 base_address, u64 nro_heap_address, u64 nro_heap_size, u64 bss_heap_address, u64 bss_heap_size) {
/* Set up the process memory regions. */
os::ProcessMemoryRegion regions[2];
const size_t num_regions = SetupNroProcessMemoryRegions(regions, nro_heap_address, nro_heap_size, bss_heap_address, bss_heap_size);
/* Unmap the nro/bss. */
R_RETURN(os::UnmapProcessCodeMemory(process_handle, base_address, regions, num_regions));
}
}