mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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438 lines
20 KiB
C++
438 lines
20 KiB
C++
/*
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* Copyright (c) 2018-2020 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 <stratosphere.hpp>
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#include "ldr_capabilities.hpp"
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namespace ams::ldr::caps {
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namespace {
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/* Types. */
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enum class CapabilityId {
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KernelFlags = 3,
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SyscallMask = 4,
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MapRange = 6,
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MapPage = 7,
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MapRegion = 10,
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InterruptPair = 11,
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ApplicationType = 13,
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KernelVersion = 14,
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HandleTable = 15,
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DebugFlags = 16,
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Empty = 32,
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};
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template<size_t Index, size_t Count, typename T = u32>
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using CapabilityField = util::BitPack32::Field<Index, Count, T>;
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#define DEFINE_CAPABILITY_FIELD(name, prev, ...) \
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using name = CapabilityField<prev::Next, __VA_ARGS__>; \
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constexpr ALWAYS_INLINE typename name::Type Get##name() const { return this->Get<name>(); }
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constexpr ALWAYS_INLINE CapabilityId GetCapabilityId(util::BitPack32 cap) {
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return static_cast<CapabilityId>(__builtin_ctz(~cap.value));
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}
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constexpr inline util::BitPack32 EmptyCapability = {~u32{}};
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static_assert(GetCapabilityId(EmptyCapability) == CapabilityId::Empty);
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#define CAPABILITY_CLASS_NAME(id) Capability##id
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#define DEFINE_CAPABILITY_CLASS(id, member_functions) \
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class CAPABILITY_CLASS_NAME(id) { \
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public: \
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static constexpr CapabilityId Id = CapabilityId::id; \
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using IdBits = CapabilityField<0, static_cast<size_t>(Id) + 1>; \
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static constexpr u32 IdBitsValue = (static_cast<u32>(1) << static_cast<size_t>(Id)) - 1; \
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private: \
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util::BitPack32 value; \
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private: \
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template<typename FieldType> \
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constexpr ALWAYS_INLINE typename FieldType::Type Get() const { return this->value.Get<FieldType>(); } \
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template<typename FieldType> \
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constexpr ALWAYS_INLINE void Set(typename FieldType::Type fv) { this->value.Set<FieldType>(fv); } \
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constexpr ALWAYS_INLINE u32 GetValue() const { return this->value.value; } \
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public: \
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constexpr ALWAYS_INLINE CAPABILITY_CLASS_NAME(id)(util::BitPack32 v) : value{v} { /* ... */ } \
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\
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static constexpr CAPABILITY_CLASS_NAME(id) Decode(util::BitPack32 v) { return CAPABILITY_CLASS_NAME(id)(v); } \
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\
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member_functions \
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}; \
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static_assert(std::is_trivially_destructible<CAPABILITY_CLASS_NAME(id)>::value)
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/* Class definitions. */
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DEFINE_CAPABILITY_CLASS(KernelFlags,
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DEFINE_CAPABILITY_FIELD(MaximumThreadPriority, IdBits, 6);
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DEFINE_CAPABILITY_FIELD(MinimumThreadPriority, MaximumThreadPriority, 6);
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DEFINE_CAPABILITY_FIELD(MinimumCoreId, MinimumThreadPriority, 8);
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DEFINE_CAPABILITY_FIELD(MaximumCoreId, MinimumCoreId, 8);
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bool IsValid(const util::BitPack32 *kac, size_t kac_count) const {
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i]);
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if (this->GetMinimumThreadPriority() < restriction.GetMinimumThreadPriority() ||
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this->GetMaximumThreadPriority() > restriction.GetMaximumThreadPriority() ||
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this->GetMinimumThreadPriority() > this->GetMaximumThreadPriority()) {
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return false;
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}
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if (this->GetMinimumCoreId() < restriction.GetMinimumCoreId() ||
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this->GetMaximumCoreId() > restriction.GetMaximumCoreId() ||
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this->GetMinimumCoreId() > this->GetMaximumCoreId()) {
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return false;
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}
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return true;
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}
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}
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return false;
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}
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);
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DEFINE_CAPABILITY_CLASS(SyscallMask,
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DEFINE_CAPABILITY_FIELD(Mask, IdBits, 24);
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DEFINE_CAPABILITY_FIELD(Index, Mask, 3);
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bool IsValid(const util::BitPack32 *kac, size_t kac_count) const {
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i]);
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if (this->GetIndex() == restriction.GetIndex() && this->GetMask() == restriction.GetMask()) {
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return true;
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}
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}
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}
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return false;
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}
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);
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DEFINE_CAPABILITY_CLASS(MapRange,
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DEFINE_CAPABILITY_FIELD(AddressSize, IdBits, 24);
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DEFINE_CAPABILITY_FIELD(Flag, AddressSize, 1, bool);
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static constexpr size_t SizeMax = 0x100000;
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bool IsValid(const util::BitPack32 next_cap, const util::BitPack32 *kac, size_t kac_count) const {
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if (GetCapabilityId(next_cap) != Id) {
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return false;
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}
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const auto next = Decode(next_cap);
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const u32 start = this->GetAddressSize();
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const u32 size = next.GetAddressSize();
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const u32 end = start + size;
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if (size >= SizeMax) {
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return false;
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}
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i++]);
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if (i >= kac_count || GetCapabilityId(kac[i]) != Id) {
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return false;
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}
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const auto restriction_next = Decode(kac[i]);
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const u32 restriction_start = restriction.GetAddressSize();
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const u32 restriction_size = restriction_next.GetAddressSize();
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const u32 restriction_end = restriction_start + restriction_size;
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if (restriction_size >= SizeMax) {
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continue;
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}
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if (this->GetFlag() == restriction.GetFlag() && next.GetFlag() == restriction_next.GetFlag()) {
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if (restriction_start <= start && start <= restriction_end && end <= restriction_end) {
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return true;
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}
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}
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}
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}
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return false;
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}
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);
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DEFINE_CAPABILITY_CLASS(MapPage,
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DEFINE_CAPABILITY_FIELD(Address, IdBits, 24);
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bool IsValid(const util::BitPack32 *kac, size_t kac_count) const {
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i]);
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if (this->GetValue() == restriction.GetValue()) {
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return true;
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}
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}
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}
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return false;
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}
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);
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enum class MemoryRegionType : u32 {
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None = 0,
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KernelTraceBuffer = 1,
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OnMemoryBootImage = 2,
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DTB = 3,
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};
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DEFINE_CAPABILITY_CLASS(MapRegion,
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DEFINE_CAPABILITY_FIELD(Region0, IdBits, 6, MemoryRegionType);
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DEFINE_CAPABILITY_FIELD(ReadOnly0, Region0, 1, bool);
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DEFINE_CAPABILITY_FIELD(Region1, ReadOnly0, 6, MemoryRegionType);
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DEFINE_CAPABILITY_FIELD(ReadOnly1, Region1, 1, bool);
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DEFINE_CAPABILITY_FIELD(Region2, ReadOnly1, 6, MemoryRegionType);
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DEFINE_CAPABILITY_FIELD(ReadOnly2, Region2, 1, bool);
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bool IsValid(const util::BitPack32 *kac, size_t kac_count) const {
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i]);
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if (this->GetValue() == restriction.GetValue()) {
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return true;
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}
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}
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}
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return false;
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}
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);
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DEFINE_CAPABILITY_CLASS(InterruptPair,
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DEFINE_CAPABILITY_FIELD(InterruptId0, IdBits, 10);
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DEFINE_CAPABILITY_FIELD(InterruptId1, InterruptId0, 10);
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static constexpr u32 EmptyInterruptId = 0x3FF;
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bool IsSingleIdValid(const u32 id, const util::BitPack32 *kac, size_t kac_count) const {
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i]);
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if (restriction.GetInterruptId0() == EmptyInterruptId && restriction.GetInterruptId1() == EmptyInterruptId) {
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return true;
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}
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if (restriction.GetInterruptId0() == id || restriction.GetInterruptId1() == id) {
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return true;
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}
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}
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}
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return false;
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}
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bool IsValid(const util::BitPack32 *kac, size_t kac_count) const {
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return IsSingleIdValid(this->GetInterruptId0(), kac, kac_count) && IsSingleIdValid(this->GetInterruptId1(), kac, kac_count);
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}
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);
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DEFINE_CAPABILITY_CLASS(ApplicationType,
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DEFINE_CAPABILITY_FIELD(ApplicationType, IdBits, 3);
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bool IsValid(const util::BitPack32 *kac, size_t kac_count) const {
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i]);
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return restriction.GetValue() == this->GetValue();
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}
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}
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return false;
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}
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static constexpr util::BitPack32 Encode(u32 app_type) {
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util::BitPack32 encoded{IdBitsValue};
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encoded.Set<ApplicationType>(app_type);
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return encoded;
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}
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);
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DEFINE_CAPABILITY_CLASS(KernelVersion,
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DEFINE_CAPABILITY_FIELD(MinorVersion, IdBits, 4);
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DEFINE_CAPABILITY_FIELD(MajorVersion, MinorVersion, 13);
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bool IsValid(const util::BitPack32 *kac, size_t kac_count) const {
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i]);
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return restriction.GetValue() == this->GetValue();
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}
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}
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return false;
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}
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);
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DEFINE_CAPABILITY_CLASS(HandleTable,
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DEFINE_CAPABILITY_FIELD(Size, IdBits, 10);
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bool IsValid(const util::BitPack32 *kac, size_t kac_count) const {
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i]);
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return this->GetSize() <= restriction.GetSize();
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}
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}
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return false;
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}
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);
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DEFINE_CAPABILITY_CLASS(DebugFlags,
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DEFINE_CAPABILITY_FIELD(AllowDebug, IdBits, 1, bool);
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DEFINE_CAPABILITY_FIELD(ForceDebug, AllowDebug, 1, bool);
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bool IsValid(const util::BitPack32 *kac, size_t kac_count) const {
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for (size_t i = 0; i < kac_count; i++) {
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if (GetCapabilityId(kac[i]) == Id) {
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const auto restriction = Decode(kac[i]);
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return (restriction.GetValue() & this->GetValue()) == this->GetValue();
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}
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}
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return false;
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}
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static constexpr util::BitPack32 Encode(bool allow_debug, bool force_debug) {
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util::BitPack32 encoded{IdBitsValue};
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encoded.Set<AllowDebug>(allow_debug);
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encoded.Set<ForceDebug>(force_debug);
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return encoded;
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}
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);
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}
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/* Capabilities API. */
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Result ValidateCapabilities(const void *acid_kac, size_t acid_kac_size, const void *aci_kac, size_t aci_kac_size) {
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const util::BitPack32 *acid_caps = reinterpret_cast<const util::BitPack32 *>(acid_kac);
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const util::BitPack32 *aci_caps = reinterpret_cast<const util::BitPack32 *>(aci_kac);
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const size_t num_acid_caps = acid_kac_size / sizeof(*acid_caps);
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const size_t num_aci_caps = aci_kac_size / sizeof(*aci_caps);
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for (size_t i = 0; i < num_aci_caps; i++) {
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const auto cur_cap = aci_caps[i];
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const auto id = GetCapabilityId(cur_cap);
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#define VALIDATE_CASE(id) \
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case CapabilityId::id: \
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R_UNLESS(Capability##id::Decode(cur_cap).IsValid(acid_caps, num_acid_caps), ldr::ResultInvalidCapability##id()); \
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break
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switch (id) {
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VALIDATE_CASE(KernelFlags);
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VALIDATE_CASE(SyscallMask);
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VALIDATE_CASE(MapPage);
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VALIDATE_CASE(MapRegion);
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VALIDATE_CASE(InterruptPair);
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VALIDATE_CASE(ApplicationType);
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VALIDATE_CASE(KernelVersion);
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VALIDATE_CASE(HandleTable);
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VALIDATE_CASE(DebugFlags);
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case CapabilityId::MapRange:
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{
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/* Map Range needs extra logic because there it involves two sequential caps. */
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i++;
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R_UNLESS(i < num_aci_caps, ldr::ResultInvalidCapabilityMapRange());
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R_UNLESS(CapabilityMapRange::Decode(cur_cap).IsValid(aci_caps[i], acid_caps, num_acid_caps), ldr::ResultInvalidCapabilityMapRange());
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}
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break;
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default:
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R_UNLESS(id == CapabilityId::Empty, ldr::ResultUnknownCapability());
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break;
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}
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#undef VALIDATE_CASE
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}
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return ResultSuccess();
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}
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u16 GetProgramInfoFlags(const void *kac, size_t kac_size) {
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const util::BitPack32 *caps = reinterpret_cast<const util::BitPack32 *>(kac);
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const size_t num_caps = kac_size / sizeof(*caps);
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u16 flags = 0;
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for (size_t i = 0; i < num_caps; i++) {
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const auto cur_cap = caps[i];
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switch (GetCapabilityId(cur_cap)) {
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case CapabilityId::ApplicationType:
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{
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const auto app_type = CapabilityApplicationType::Decode(cur_cap).GetApplicationType() & ProgramInfoFlag_ApplicationTypeMask;
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if (app_type != ProgramInfoFlag_InvalidType) {
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flags |= app_type;
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}
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}
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break;
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case CapabilityId::DebugFlags:
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if (CapabilityDebugFlags::Decode(cur_cap).GetAllowDebug()) {
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flags |= ProgramInfoFlag_AllowDebug;
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}
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break;
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default:
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break;
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}
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}
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return flags;
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}
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void SetProgramInfoFlags(u16 flags, void *kac, size_t kac_size) {
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util::BitPack32 *caps = reinterpret_cast<util::BitPack32 *>(kac);
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const size_t num_caps = kac_size / sizeof(*caps);
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for (size_t i = 0; i < num_caps; i++) {
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const auto cur_cap = caps[i];
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switch (GetCapabilityId(cur_cap)) {
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case CapabilityId::ApplicationType:
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caps[i] = CapabilityApplicationType::Encode(flags & ProgramInfoFlag_ApplicationTypeMask);
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break;
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case CapabilityId::DebugFlags:
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caps[i] = CapabilityDebugFlags::Encode((flags & ProgramInfoFlag_AllowDebug) != 0, CapabilityDebugFlags::Decode(cur_cap).GetForceDebug());
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break;
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default:
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break;
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}
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}
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}
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void ProcessCapabilities(void *kac, size_t kac_size) {
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util::BitPack32 *caps = reinterpret_cast<util::BitPack32 *>(kac);
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const size_t num_caps = kac_size / sizeof(*caps);
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for (size_t i = 0; i < num_caps; i++) {
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const auto cur_cap = caps[i];
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switch (GetCapabilityId(cur_cap)) {
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case CapabilityId::MapRegion:
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{
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/* MapRegion was added in 8.0.0+. */
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/* To prevent kernel error, we should reject the descriptor on lower firmwares. */
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/* NOTE: We also allow it on any firmware under mesosphere, as an extension. */
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const bool is_allowed = (hos::GetVersion() >= hos::Version_8_0_0 || svc::IsKernelMesosphere());
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if (!is_allowed) {
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caps[i] = EmptyCapability;
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}
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}
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break;
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default:
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break;
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}
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}
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}
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}
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