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5167d1577d
The kernel allows restricting the total size of the handle table through the process capability descriptors. Until now, this functionality wasn't hooked up. With this, the process handle tables become properly restricted. In the case of metadata-less executables, the handle table will assume the maximum size is requested, preserving the behavior that existed before these changes.
123 lines
3.3 KiB
C++
123 lines
3.3 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <utility>
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#include "common/assert.h"
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#include "common/logging/log.h"
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#include "core/core.h"
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#include "core/hle/kernel/errors.h"
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#include "core/hle/kernel/handle_table.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/kernel/thread.h"
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namespace Kernel {
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namespace {
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constexpr u16 GetSlot(Handle handle) {
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return static_cast<u16>(handle >> 15);
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}
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constexpr u16 GetGeneration(Handle handle) {
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return static_cast<u16>(handle & 0x7FFF);
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}
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} // Anonymous namespace
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HandleTable::HandleTable() {
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Clear();
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}
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HandleTable::~HandleTable() = default;
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ResultCode HandleTable::SetSize(s32 handle_table_size) {
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if (static_cast<u32>(handle_table_size) > MAX_COUNT) {
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return ERR_OUT_OF_MEMORY;
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}
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// Values less than or equal to zero indicate to use the maximum allowable
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// size for the handle table in the actual kernel, so we ignore the given
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// value in that case, since we assume this by default unless this function
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// is called.
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if (handle_table_size > 0) {
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table_size = static_cast<u16>(handle_table_size);
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}
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return RESULT_SUCCESS;
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}
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ResultVal<Handle> HandleTable::Create(SharedPtr<Object> obj) {
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DEBUG_ASSERT(obj != nullptr);
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const u16 slot = next_free_slot;
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if (slot >= table_size) {
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LOG_ERROR(Kernel, "Unable to allocate Handle, too many slots in use.");
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return ERR_HANDLE_TABLE_FULL;
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}
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next_free_slot = generations[slot];
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const u16 generation = next_generation++;
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// Overflow count so it fits in the 15 bits dedicated to the generation in the handle.
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// Horizon OS uses zero to represent an invalid handle, so skip to 1.
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if (next_generation >= (1 << 15)) {
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next_generation = 1;
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}
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generations[slot] = generation;
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objects[slot] = std::move(obj);
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Handle handle = generation | (slot << 15);
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return MakeResult<Handle>(handle);
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}
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ResultVal<Handle> HandleTable::Duplicate(Handle handle) {
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SharedPtr<Object> object = GetGeneric(handle);
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if (object == nullptr) {
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LOG_ERROR(Kernel, "Tried to duplicate invalid handle: {:08X}", handle);
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return ERR_INVALID_HANDLE;
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}
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return Create(std::move(object));
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}
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ResultCode HandleTable::Close(Handle handle) {
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if (!IsValid(handle))
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return ERR_INVALID_HANDLE;
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u16 slot = GetSlot(handle);
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objects[slot] = nullptr;
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generations[slot] = next_free_slot;
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next_free_slot = slot;
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return RESULT_SUCCESS;
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}
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bool HandleTable::IsValid(Handle handle) const {
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std::size_t slot = GetSlot(handle);
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u16 generation = GetGeneration(handle);
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return slot < table_size && objects[slot] != nullptr && generations[slot] == generation;
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}
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SharedPtr<Object> HandleTable::GetGeneric(Handle handle) const {
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if (handle == CurrentThread) {
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return GetCurrentThread();
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} else if (handle == CurrentProcess) {
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return Core::CurrentProcess();
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}
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if (!IsValid(handle)) {
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return nullptr;
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}
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return objects[GetSlot(handle)];
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}
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void HandleTable::Clear() {
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for (u16 i = 0; i < table_size; ++i) {
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generations[i] = i + 1;
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objects[i] = nullptr;
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}
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next_free_slot = 0;
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}
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} // namespace Kernel
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