Atmosphere/stratosphere/libstratosphere/source/map/map_api.cpp

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/*
* Copyright (c) 2018-2019 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 <stratosphere.hpp>
#include <stratosphere/map.hpp>
namespace sts::map {
namespace {
/* Convenience defines. */
constexpr size_t GuardRegionSize = 0x4000;
constexpr size_t LocateRetryCount = 0x200;
/* Deprecated/Modern implementations. */
Result LocateMappableSpaceDeprecated(uintptr_t *out_address, size_t size) {
MemoryInfo mem_info = {};
u32 page_info = 0;
uintptr_t cur_base = 0;
AddressSpaceInfo address_space;
R_TRY(GetProcessAddressSpaceInfo(&address_space, CUR_PROCESS_HANDLE));
cur_base = address_space.aslr_base;
do {
R_TRY(svcQueryMemory(&mem_info, &page_info, cur_base));
if (mem_info.type == MemType_Unmapped && mem_info.addr - cur_base + mem_info.size >= size) {
*out_address = cur_base;
return ResultSuccess;
}
const uintptr_t mem_end = mem_info.addr + mem_info.size;
if (mem_info.type == MemType_Reserved || mem_end < cur_base || (mem_end >> 31)) {
return ResultKernelOutOfMemory;
}
cur_base = mem_end;
} while (true);
}
Result LocateMappableSpaceModern(uintptr_t *out_address, size_t size) {
MemoryInfo mem_info = {};
u32 page_info = 0;
uintptr_t cur_base = 0, cur_end = 0;
AddressSpaceInfo address_space;
R_TRY(GetProcessAddressSpaceInfo(&address_space, CUR_PROCESS_HANDLE));
cur_base = address_space.aslr_base;
cur_end = cur_base + size;
if (cur_end <= cur_base) {
return ResultKernelOutOfMemory;
}
while (true) {
if (address_space.heap_size && (address_space.heap_base <= cur_end - 1 && cur_base <= address_space.heap_end - 1)) {
/* If we overlap the heap region, go to the end of the heap region. */
if (cur_base == address_space.heap_end) {
return ResultKernelOutOfMemory;
}
cur_base = address_space.heap_end;
} else if (address_space.alias_size && (address_space.alias_base <= cur_end - 1 && cur_base <= address_space.alias_end - 1)) {
/* If we overlap the alias region, go to the end of the alias region. */
if (cur_base == address_space.alias_end) {
return ResultKernelOutOfMemory;
}
cur_base = address_space.alias_end;
} else {
R_ASSERT(svcQueryMemory(&mem_info, &page_info, cur_base));
if (mem_info.type == 0 && mem_info.addr - cur_base + mem_info.size >= size) {
*out_address = cur_base;
return ResultSuccess;
}
if (mem_info.addr + mem_info.size <= cur_base) {
return ResultKernelOutOfMemory;
}
cur_base = mem_info.addr + mem_info.size;
if (cur_base >= address_space.aslr_end) {
return ResultKernelOutOfMemory;
}
}
cur_end = cur_base + size;
if (cur_base + size <= cur_base) {
return ResultKernelOutOfMemory;
}
}
}
Result MapCodeMemoryInProcessDeprecated(MappedCodeMemory &out_mcm, Handle process_handle, uintptr_t base_address, size_t size) {
AddressSpaceInfo address_space;
R_TRY(GetProcessAddressSpaceInfo(&address_space, process_handle));
if (size > address_space.aslr_size) {
return ResultRoInsufficientAddressSpace;
}
uintptr_t try_address;
for (unsigned int i = 0; i < LocateRetryCount; i++) {
try_address = address_space.aslr_base + (rnd::GenerateRandomU64(static_cast<u64>(address_space.aslr_size - size) >> 12) << 12);
MappedCodeMemory tmp_mcm(process_handle, try_address, base_address, size);
R_TRY_CATCH(tmp_mcm.GetResult()) {
R_CATCH(ResultKernelInvalidMemoryState) {
continue;
}
} R_END_TRY_CATCH;
if (!CanAddGuardRegionsInProcess(process_handle, try_address, size)) {
continue;
}
/* We're done searching. */
out_mcm = std::move(tmp_mcm);
return ResultSuccess;
}
return ResultRoInsufficientAddressSpace;
}
Result MapCodeMemoryInProcessModern(MappedCodeMemory &out_mcm, Handle process_handle, uintptr_t base_address, size_t size) {
AddressSpaceInfo address_space;
R_TRY(GetProcessAddressSpaceInfo(&address_space, process_handle));
if (size > address_space.aslr_size) {
return ResultRoInsufficientAddressSpace;
}
uintptr_t try_address;
for (unsigned int i = 0; i < LocateRetryCount; i++) {
while (true) {
try_address = address_space.aslr_base + (rnd::GenerateRandomU64(static_cast<u64>(address_space.aslr_size - size) >> 12) << 12);
if (address_space.heap_size && (address_space.heap_base <= try_address + size - 1 && try_address <= address_space.heap_end - 1)) {
continue;
}
if (address_space.alias_size && (address_space.alias_base <= try_address + size - 1 && try_address <= address_space.alias_end - 1)) {
continue;
}
break;
}
MappedCodeMemory tmp_mcm(process_handle, try_address, base_address, size);
R_TRY_CATCH(tmp_mcm.GetResult()) {
R_CATCH(ResultKernelInvalidMemoryState) {
continue;
}
} R_END_TRY_CATCH;
if (!CanAddGuardRegionsInProcess(process_handle, try_address, size)) {
continue;
}
/* We're done searching. */
out_mcm = std::move(tmp_mcm);
return ResultSuccess;
}
return ResultRoInsufficientAddressSpace;
}
}
/* Public API. */
Result GetProcessAddressSpaceInfo(AddressSpaceInfo *out, Handle process_h) {
/* Clear output. */
std::memset(out, 0, sizeof(*out));
/* Retrieve info from kernel. */
R_TRY(svcGetInfo(&out->heap_base, InfoType_HeapRegionAddress, process_h, 0));
R_TRY(svcGetInfo(&out->heap_size, InfoType_HeapRegionSize, process_h, 0));
R_TRY(svcGetInfo(&out->alias_base, InfoType_AliasRegionAddress, process_h, 0));
R_TRY(svcGetInfo(&out->alias_size, InfoType_AliasRegionSize, process_h, 0));
if (hos::GetVersion() >= hos::Version_200) {
R_TRY(svcGetInfo(&out->aslr_base, InfoType_AslrRegionAddress, process_h, 0));
R_TRY(svcGetInfo(&out->aslr_size, InfoType_AslrRegionSize, process_h, 0));
} else {
/* Auto-detect 32-bit vs 64-bit. */
if (out->heap_base < AslrBase64BitDeprecated || out->alias_base < AslrBase64BitDeprecated) {
out->aslr_base = AslrBase32Bit;
out->aslr_size = AslrSize32Bit;
} else {
out->aslr_base = AslrBase64BitDeprecated;
out->aslr_size = AslrSize64BitDeprecated;
}
}
out->heap_end = out->heap_base + out->heap_size;
out->alias_end = out->alias_base + out->alias_size;
out->aslr_end = out->aslr_base + out->aslr_size;
return ResultSuccess;
}
Result LocateMappableSpace(uintptr_t *out_address, size_t size) {
if (hos::GetVersion() >= hos::Version_200) {
return LocateMappableSpaceModern(out_address, size);
} else {
return LocateMappableSpaceDeprecated(out_address, size);
}
}
Result MapCodeMemoryInProcess(MappedCodeMemory &out_mcm, Handle process_handle, uintptr_t base_address, size_t size) {
if (hos::GetVersion() >= hos::Version_200) {
return MapCodeMemoryInProcessModern(out_mcm, process_handle, base_address, size);
} else {
return MapCodeMemoryInProcessDeprecated(out_mcm, process_handle, base_address, size);
}
}
bool CanAddGuardRegionsInProcess(Handle process_handle, uintptr_t address, size_t size) {
MemoryInfo mem_info;
u32 page_info;
/* Nintendo doesn't validate SVC return values at all. */
/* TODO: Should we allow these to fail? */
R_ASSERT(svcQueryProcessMemory(&mem_info, &page_info, process_handle, address - 1));
if (mem_info.type == MemType_Unmapped && address - GuardRegionSize >= mem_info.addr) {
R_ASSERT(svcQueryProcessMemory(&mem_info, &page_info, process_handle, address + size));
return mem_info.type == MemType_Unmapped && address + size + GuardRegionSize <= mem_info.addr + mem_info.size;
}
return false;
}
}