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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "gpu/command_buffer/service/common_decoder.h"
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <algorithm>
#include "base/numerics/safe_math.h"
#include "base/pickle.h"
#include "gpu/command_buffer/service/command_buffer_service.h"
#include "gpu/command_buffer/service/decoder_client.h"
#include "ui/gfx/ipc/color/gfx_param_traits.h"
namespace gpu {
namespace {
static const size_t kDefaultMaxBucketSize = 1u << 30; // 1 GB
uint32_t LoadU32Unaligned(const void* ptr) {
uint32_t ret;
memcpy(&ret, ptr, sizeof(uint32_t));
return ret;
}
void StoreU32Unaligned(uint32_t v, void* ptr) {
memcpy(ptr, &v, sizeof(uint32_t));
}
} // namespace
const CommonDecoder::CommandInfo CommonDecoder::command_info[] = {
#define COMMON_COMMAND_BUFFER_CMD_OP(name) \
{ \
&CommonDecoder::Handle##name, cmd::name::kArgFlags, \
cmd::name::cmd_flags, \
sizeof(cmd::name) / sizeof(CommandBufferEntry) - 1, \
} \
, /* NOLINT */
COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
#undef COMMON_COMMAND_BUFFER_CMD_OP
};
CommonDecoder::Bucket::Bucket() : size_(0) {}
CommonDecoder::Bucket::~Bucket() = default;
void* CommonDecoder::Bucket::GetData(size_t offset, size_t size) const {
if (OffsetSizeValid(offset, size)) {
return data_.get() + offset;
}
return nullptr;
}
void CommonDecoder::Bucket::SetSize(size_t size) {
if (size != size_) {
// Note: the `()` after `new[]` is significant: it ensures the elements are
// value-initialized (not to be confused with default *initialized*). In the
// case of int8_t, that means the returned buffer will be
// zero-initialized.
data_.reset(size ? new int8_t[size]() : nullptr);
size_ = size;
}
}
bool CommonDecoder::Bucket::SetData(
const volatile void* src, size_t offset, size_t size) {
if (OffsetSizeValid(offset, size)) {
memcpy(data_.get() + offset, const_cast<const void*>(src), size);
return true;
}
return false;
}
void CommonDecoder::Bucket::SetFromString(const char* str) {
// Strings are passed nullptr terminated to distinguish between empty string
// and no string.
if (!str) {
SetSize(0);
} else {
size_t size = strlen(str) + 1;
SetSize(size);
SetData(str, 0, size);
}
}
bool CommonDecoder::Bucket::GetAsString(std::string* str) {
DCHECK(str);
if (size_ == 0) {
return false;
}
str->assign(GetDataAs<const char*>(0, size_ - 1), size_ - 1);
return true;
}
bool CommonDecoder::Bucket::GetAsStrings(
GLsizei* _count, std::vector<char*>* _string, std::vector<GLint>* _length) {
const size_t kMinBucketSize = sizeof(GLint);
// Each string has at least |length| in the header and a NUL character.
const size_t kMinStringSize = sizeof(GLint) + 1;
const size_t bucket_size = this->size();
if (bucket_size < kMinBucketSize) {
return false;
}
char* bucket_data = this->GetDataAs<char*>(0, bucket_size);
GLint* header = reinterpret_cast<GLint*>(bucket_data);
GLsizei count = static_cast<GLsizei>(header[0]);
if (count < 0) {
return false;
}
const size_t max_count = (bucket_size - kMinBucketSize) / kMinStringSize;
if (max_count < static_cast<size_t>(count)) {
return false;
}
GLint* length = header + 1;
std::vector<char*> strs(count);
base::CheckedNumeric<size_t> total_size = sizeof(GLint);
total_size *= count + 1; // Header size.
if (!total_size.IsValid())
return false;
for (GLsizei ii = 0; ii < count; ++ii) {
strs[ii] = bucket_data + total_size.ValueOrDefault(0);
total_size += length[ii];
total_size += 1; // NUL char at the end of each char array.
if (!total_size.IsValid() || total_size.ValueOrDefault(0) > bucket_size ||
strs[ii][length[ii]] != 0) {
return false;
}
}
if (total_size.ValueOrDefault(0) != bucket_size) {
return false;
}
DCHECK(_count && _string && _length);
*_count = count;
*_string = strs;
_length->resize(count);
for (GLsizei ii = 0; ii < count; ++ii) {
(*_length)[ii] = length[ii];
}
return true;
}
bool CommonDecoder::Bucket::OffsetSizeValid(size_t offset, size_t size) const {
size_t end = 0;
if (!base::CheckAdd<size_t>(offset, size).AssignIfValid(&end))
return false;
return end <= size_;
}
CommonDecoder::CommonDecoder(DecoderClient* client,
CommandBufferServiceBase* command_buffer_service)
: command_buffer_service_(command_buffer_service),
client_(client),
max_bucket_size_(kDefaultMaxBucketSize) {
DCHECK(command_buffer_service_);
}
CommonDecoder::~CommonDecoder() = default;
void* CommonDecoder::GetAddressAndCheckSize(unsigned int shm_id,
unsigned int data_offset,
unsigned int data_size) {
scoped_refptr<gpu::Buffer> buffer =
command_buffer_service_->GetTransferBuffer(shm_id);
if (!buffer.get())
return nullptr;
return buffer->GetDataAddress(data_offset, data_size);
}
void* CommonDecoder::GetAddressAndSize(unsigned int shm_id,
unsigned int data_offset,
unsigned int minimum_size,
unsigned int* data_size) {
scoped_refptr<gpu::Buffer> buffer =
command_buffer_service_->GetTransferBuffer(shm_id);
if (!buffer.get() || buffer->GetRemainingSize(data_offset) < minimum_size)
return nullptr;
return buffer->GetDataAddressAndSize(data_offset, data_size);
}
unsigned int CommonDecoder::GetSharedMemorySize(unsigned int shm_id,
unsigned int offset) {
scoped_refptr<gpu::Buffer> buffer =
command_buffer_service_->GetTransferBuffer(shm_id);
if (!buffer.get())
return 0;
return buffer->GetRemainingSize(offset);
}
scoped_refptr<gpu::Buffer> CommonDecoder::GetSharedMemoryBuffer(
unsigned int shm_id) {
return command_buffer_service_->GetTransferBuffer(shm_id);
}
const char* CommonDecoder::GetCommonCommandName(
cmd::CommandId command_id) const {
return cmd::GetCommandName(command_id);
}
CommonDecoder::Bucket* CommonDecoder::GetBucket(uint32_t bucket_id) const {
BucketMap::const_iterator iter(buckets_.find(bucket_id));
return iter != buckets_.end() ? &(*iter->second) : nullptr;
}
CommonDecoder::Bucket* CommonDecoder::CreateBucket(uint32_t bucket_id) {
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
bucket = new Bucket();
buckets_[bucket_id] = std::unique_ptr<Bucket>(bucket);
}
return bucket;
}
namespace {
// Returns the address of the first byte after a struct.
template <typename T>
const volatile void* AddressAfterStruct(const volatile T& pod) {
return reinterpret_cast<const volatile uint8_t*>(&pod) + sizeof(pod);
}
// Returns the address of the frst byte after the struct.
template <typename RETURN_TYPE, typename COMMAND_TYPE>
RETURN_TYPE GetImmediateDataAs(const volatile COMMAND_TYPE& pod) {
return static_cast<RETURN_TYPE>(
const_cast<volatile void*>(AddressAfterStruct(pod)));
}
} // anonymous namespace.
// Decode command with its arguments, and call the corresponding method.
// Note: args is a pointer to the command buffer. As such, it could be changed
// by a (malicious) client at any time, so if validation has to happen, it
// should operate on a copy of them.
error::Error CommonDecoder::DoCommonCommand(unsigned int command,
unsigned int arg_count,
const volatile void* cmd_data) {
if (command < std::size(command_info)) {
const CommandInfo& info = command_info[command];
unsigned int info_arg_count = static_cast<unsigned int>(info.arg_count);
if ((info.arg_flags == cmd::kFixed && arg_count == info_arg_count) ||
(info.arg_flags == cmd::kAtLeastN && arg_count >= info_arg_count)) {
uint32_t immediate_data_size =
(arg_count - info_arg_count) * sizeof(CommandBufferEntry); // NOLINT
return (this->*info.cmd_handler)(immediate_data_size, cmd_data);
} else {
return error::kInvalidArguments;
}
}
return error::kUnknownCommand;
}
error::Error CommonDecoder::HandleNoop(uint32_t immediate_data_size,
const volatile void* cmd_data) {
return error::kNoError;
}
error::Error CommonDecoder::HandleSetToken(uint32_t immediate_data_size,
const volatile void* cmd_data) {
const volatile cmd::SetToken& args =
*static_cast<const volatile cmd::SetToken*>(cmd_data);
command_buffer_service_->SetToken(args.token);
return error::kNoError;
}
error::Error CommonDecoder::HandleSetBucketSize(uint32_t immediate_data_size,
const volatile void* cmd_data) {
const volatile cmd::SetBucketSize& args =
*static_cast<const volatile cmd::SetBucketSize*>(cmd_data);
uint32_t bucket_id = args.bucket_id;
uint32_t size = args.size;
if (size > max_bucket_size_)
return error::kOutOfBounds;
Bucket* bucket = CreateBucket(bucket_id);
bucket->SetSize(size);
return error::kNoError;
}
error::Error CommonDecoder::HandleSetBucketData(uint32_t immediate_data_size,
const volatile void* cmd_data) {
const volatile cmd::SetBucketData& args =
*static_cast<const volatile cmd::SetBucketData*>(cmd_data);
uint32_t bucket_id = args.bucket_id;
uint32_t offset = args.offset;
uint32_t size = args.size;
const void* data = GetSharedMemoryAs<const void*>(
args.shared_memory_id, args.shared_memory_offset, size);
if (!data) {
return error::kInvalidArguments;
}
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
return error::kInvalidArguments;
}
if (!bucket->SetData(data, offset, size)) {
return error::kInvalidArguments;
}
return error::kNoError;
}
error::Error CommonDecoder::HandleSetBucketDataImmediate(
uint32_t immediate_data_size,
const volatile void* cmd_data) {
const volatile cmd::SetBucketDataImmediate& args =
*static_cast<const volatile cmd::SetBucketDataImmediate*>(cmd_data);
const volatile void* data = GetImmediateDataAs<const volatile void*>(args);
uint32_t bucket_id = args.bucket_id;
uint32_t offset = args.offset;
uint32_t size = args.size;
if (size > immediate_data_size) {
return error::kInvalidArguments;
}
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
return error::kInvalidArguments;
}
if (!bucket->SetData(data, offset, size)) {
return error::kInvalidArguments;
}
return error::kNoError;
}
error::Error CommonDecoder::HandleGetBucketStart(
uint32_t immediate_data_size,
const volatile void* cmd_data) {
const volatile cmd::GetBucketStart& args =
*static_cast<const volatile cmd::GetBucketStart*>(cmd_data);
uint32_t bucket_id = args.bucket_id;
// `result` may not be aligned, so cast to `void*` and use `memcpy` to load
// and store.
void* result = GetSharedMemoryAs<void*>(
args.result_memory_id, args.result_memory_offset, sizeof(uint32_t));
int32_t data_memory_id = args.data_memory_id;
uint32_t data_memory_offset = args.data_memory_offset;
uint32_t data_memory_size = args.data_memory_size;
uint8_t* data = nullptr;
if (data_memory_size != 0 || data_memory_id != 0 || data_memory_offset != 0) {
data = GetSharedMemoryAs<uint8_t*>(data_memory_id, data_memory_offset,
data_memory_size);
if (!data) {
return error::kInvalidArguments;
}
}
if (!result) {
return error::kInvalidArguments;
}
// Check that the client initialized the result.
if (LoadU32Unaligned(result) != 0) {
return error::kInvalidArguments;
}
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
return error::kInvalidArguments;
}
uint32_t bucket_size = bucket->size();
StoreU32Unaligned(bucket_size, result);
if (data) {
uint32_t size = std::min(data_memory_size, bucket_size);
memcpy(data, bucket->GetData(0, size), size);
}
return error::kNoError;
}
error::Error CommonDecoder::HandleGetBucketData(uint32_t immediate_data_size,
const volatile void* cmd_data) {
const volatile cmd::GetBucketData& args =
*static_cast<const volatile cmd::GetBucketData*>(cmd_data);
uint32_t bucket_id = args.bucket_id;
uint32_t offset = args.offset;
uint32_t size = args.size;
void* data = GetSharedMemoryAs<void*>(
args.shared_memory_id, args.shared_memory_offset, size);
if (!data) {
return error::kInvalidArguments;
}
Bucket* bucket = GetBucket(bucket_id);
if (!bucket) {
return error::kInvalidArguments;
}
const void* src = bucket->GetData(offset, size);
if (!src) {
return error::kInvalidArguments;
}
memcpy(data, src, size);
return error::kNoError;
}
error::Error CommonDecoder::HandleInsertFenceSync(
uint32_t immediate_data_size,
const volatile void* cmd_data) {
const volatile cmd::InsertFenceSync& c =
*static_cast<const volatile cmd::InsertFenceSync*>(cmd_data);
const uint64_t release_count = c.release_count();
client_->OnFenceSyncRelease(release_count);
// Exit inner command processing loop so that we check the scheduling state
// and yield if necessary as we may have unblocked a higher priority
// context.
ExitCommandProcessingEarly();
return error::kNoError;
}
bool CommonDecoder::ReadColorSpace(uint32_t shm_id,
uint32_t shm_offset,
uint32_t color_space_size,
gfx::ColorSpace* color_space) {
// Use the default (invalid) color space if no space was serialized.
if (!shm_id && !shm_offset && !color_space_size) {
*color_space = gfx::ColorSpace();
return true;
}
const uint8_t* data = static_cast<const uint8_t*>(
GetAddressAndCheckSize(shm_id, shm_offset, color_space_size));
if (!data) {
return false;
}
base::span<const uint8_t> color_space_data(data, data + color_space_size);
base::Pickle color_space_pickle =
base::Pickle::WithUnownedBuffer(color_space_data);
base::PickleIterator iterator(color_space_pickle);
if (!IPC::ParamTraits<gfx::ColorSpace>::Read(&color_space_pickle, &iterator,
color_space)) {
return false;
}
return true;
}
} // namespace gpu
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