| /* |
| * Copyright (C) 2005 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "Parcel" |
| //#define LOG_NDEBUG 0 |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <linux/sched.h> |
| #include <pthread.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/resource.h> |
| #include <unistd.h> |
| |
| #include <binder/Binder.h> |
| #include <binder/BpBinder.h> |
| #include <binder/IPCThreadState.h> |
| #include <binder/Parcel.h> |
| #include <binder/ProcessState.h> |
| #include <binder/Stability.h> |
| #include <binder/Status.h> |
| #include <binder/TextOutput.h> |
| |
| #include <cutils/ashmem.h> |
| #include <cutils/compiler.h> |
| #include <utils/Flattenable.h> |
| #include <utils/Log.h> |
| #include <utils/String16.h> |
| #include <utils/String8.h> |
| #include <utils/misc.h> |
| |
| #include "RpcState.h" |
| #include "Static.h" |
| #include "Utils.h" |
| #include "binder_module.h" |
| |
| #define LOG_REFS(...) |
| //#define LOG_REFS(...) ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__) |
| #define LOG_ALLOC(...) |
| //#define LOG_ALLOC(...) ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__) |
| |
| // --------------------------------------------------------------------------- |
| |
| // This macro should never be used at runtime, as a too large value |
| // of s could cause an integer overflow. Instead, you should always |
| // use the wrapper function pad_size() |
| #define PAD_SIZE_UNSAFE(s) (((s)+3)&~3) |
| |
| static size_t pad_size(size_t s) { |
| if (s > (std::numeric_limits<size_t>::max() - 3)) { |
| LOG_ALWAYS_FATAL("pad size too big %zu", s); |
| } |
| return PAD_SIZE_UNSAFE(s); |
| } |
| |
| // Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER |
| #define STRICT_MODE_PENALTY_GATHER (1 << 31) |
| |
| namespace android { |
| |
| // many things compile this into prebuilts on the stack |
| #ifdef __LP64__ |
| static_assert(sizeof(Parcel) == 120); |
| #else |
| static_assert(sizeof(Parcel) == 60); |
| #endif |
| |
| static std::atomic<size_t> gParcelGlobalAllocCount; |
| static std::atomic<size_t> gParcelGlobalAllocSize; |
| |
| static size_t gMaxFds = 0; |
| |
| // Maximum size of a blob to transfer in-place. |
| static const size_t BLOB_INPLACE_LIMIT = 16 * 1024; |
| |
| enum { |
| BLOB_INPLACE = 0, |
| BLOB_ASHMEM_IMMUTABLE = 1, |
| BLOB_ASHMEM_MUTABLE = 2, |
| }; |
| |
| static void acquire_object(const sp<ProcessState>& proc, |
| const flat_binder_object& obj, const void* who, size_t* outAshmemSize) |
| { |
| switch (obj.hdr.type) { |
| case BINDER_TYPE_BINDER: |
| if (obj.binder) { |
| LOG_REFS("Parcel %p acquiring reference on local %llu", who, obj.cookie); |
| reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who); |
| } |
| return; |
| case BINDER_TYPE_HANDLE: { |
| const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); |
| if (b != nullptr) { |
| LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); |
| b->incStrong(who); |
| } |
| return; |
| } |
| case BINDER_TYPE_FD: { |
| if ((obj.cookie != 0) && (outAshmemSize != nullptr) && ashmem_valid(obj.handle)) { |
| // If we own an ashmem fd, keep track of how much memory it refers to. |
| int size = ashmem_get_size_region(obj.handle); |
| if (size > 0) { |
| *outAshmemSize += size; |
| } |
| } |
| return; |
| } |
| } |
| |
| ALOGD("Invalid object type 0x%08x", obj.hdr.type); |
| } |
| |
| static void release_object(const sp<ProcessState>& proc, |
| const flat_binder_object& obj, const void* who, size_t* outAshmemSize) |
| { |
| switch (obj.hdr.type) { |
| case BINDER_TYPE_BINDER: |
| if (obj.binder) { |
| LOG_REFS("Parcel %p releasing reference on local %llu", who, obj.cookie); |
| reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who); |
| } |
| return; |
| case BINDER_TYPE_HANDLE: { |
| const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); |
| if (b != nullptr) { |
| LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); |
| b->decStrong(who); |
| } |
| return; |
| } |
| case BINDER_TYPE_FD: { |
| if (obj.cookie != 0) { // owned |
| if ((outAshmemSize != nullptr) && ashmem_valid(obj.handle)) { |
| int size = ashmem_get_size_region(obj.handle); |
| if (size > 0) { |
| // ashmem size might have changed since last time it was accounted for, e.g. |
| // in acquire_object(). Value of *outAshmemSize is not critical since we are |
| // releasing the object anyway. Check for integer overflow condition. |
| *outAshmemSize -= std::min(*outAshmemSize, static_cast<size_t>(size)); |
| } |
| } |
| |
| close(obj.handle); |
| } |
| return; |
| } |
| } |
| |
| ALOGE("Invalid object type 0x%08x", obj.hdr.type); |
| } |
| |
| status_t Parcel::finishFlattenBinder(const sp<IBinder>& binder) |
| { |
| internal::Stability::tryMarkCompilationUnit(binder.get()); |
| int16_t rep = internal::Stability::getRepr(binder.get()); |
| return writeInt32(rep); |
| } |
| |
| status_t Parcel::finishUnflattenBinder( |
| const sp<IBinder>& binder, sp<IBinder>* out) const |
| { |
| int32_t stability; |
| status_t status = readInt32(&stability); |
| if (status != OK) return status; |
| |
| status = internal::Stability::setRepr(binder.get(), static_cast<int16_t>(stability), |
| true /*log*/); |
| if (status != OK) return status; |
| |
| *out = binder; |
| return OK; |
| } |
| |
| static constexpr inline int schedPolicyMask(int policy, int priority) { |
| return (priority & FLAT_BINDER_FLAG_PRIORITY_MASK) | ((policy & 3) << FLAT_BINDER_FLAG_SCHED_POLICY_SHIFT); |
| } |
| |
| status_t Parcel::flattenBinder(const sp<IBinder>& binder) { |
| BBinder* local = nullptr; |
| if (binder) local = binder->localBinder(); |
| if (local) local->setParceled(); |
| |
| if (isForRpc()) { |
| if (binder) { |
| status_t status = writeInt32(1); // non-null |
| if (status != OK) return status; |
| RpcAddress address = RpcAddress::zero(); |
| // TODO(b/167966510): need to undo this if the Parcel is not sent |
| status = mSession->state()->onBinderLeaving(mSession, binder, &address); |
| if (status != OK) return status; |
| status = address.writeToParcel(this); |
| if (status != OK) return status; |
| } else { |
| status_t status = writeInt32(0); // null |
| if (status != OK) return status; |
| } |
| return finishFlattenBinder(binder); |
| } |
| |
| flat_binder_object obj; |
| obj.flags = FLAT_BINDER_FLAG_ACCEPTS_FDS; |
| |
| int schedBits = 0; |
| if (!IPCThreadState::self()->backgroundSchedulingDisabled()) { |
| schedBits = schedPolicyMask(SCHED_NORMAL, 19); |
| } |
| |
| if (binder != nullptr) { |
| if (!local) { |
| BpBinder *proxy = binder->remoteBinder(); |
| if (proxy == nullptr) { |
| ALOGE("null proxy"); |
| } else { |
| if (proxy->isRpcBinder()) { |
| ALOGE("Sending a socket binder over RPC is prohibited"); |
| return INVALID_OPERATION; |
| } |
| } |
| const int32_t handle = proxy ? proxy->getPrivateAccessorForId().binderHandle() : 0; |
| obj.hdr.type = BINDER_TYPE_HANDLE; |
| obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ |
| obj.handle = handle; |
| obj.cookie = 0; |
| } else { |
| int policy = local->getMinSchedulerPolicy(); |
| int priority = local->getMinSchedulerPriority(); |
| |
| if (policy != 0 || priority != 0) { |
| // override value, since it is set explicitly |
| schedBits = schedPolicyMask(policy, priority); |
| } |
| if (local->isRequestingSid()) { |
| obj.flags |= FLAT_BINDER_FLAG_TXN_SECURITY_CTX; |
| } |
| if (local->isInheritRt()) { |
| obj.flags |= FLAT_BINDER_FLAG_INHERIT_RT; |
| } |
| obj.hdr.type = BINDER_TYPE_BINDER; |
| obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs()); |
| obj.cookie = reinterpret_cast<uintptr_t>(local); |
| } |
| } else { |
| obj.hdr.type = BINDER_TYPE_BINDER; |
| obj.binder = 0; |
| obj.cookie = 0; |
| } |
| |
| obj.flags |= schedBits; |
| |
| status_t status = writeObject(obj, false); |
| if (status != OK) return status; |
| |
| return finishFlattenBinder(binder); |
| } |
| |
| status_t Parcel::unflattenBinder(sp<IBinder>* out) const |
| { |
| if (isForRpc()) { |
| LOG_ALWAYS_FATAL_IF(mSession == nullptr, "RpcSession required to read from remote parcel"); |
| |
| int32_t isNull; |
| status_t status = readInt32(&isNull); |
| if (status != OK) return status; |
| |
| sp<IBinder> binder; |
| |
| if (isNull & 1) { |
| auto addr = RpcAddress::zero(); |
| if (status_t status = addr.readFromParcel(*this); status != OK) return status; |
| if (status_t status = mSession->state()->onBinderEntering(mSession, addr, &binder); |
| status != OK) |
| return status; |
| } |
| |
| return finishUnflattenBinder(binder, out); |
| } |
| |
| const flat_binder_object* flat = readObject(false); |
| |
| if (flat) { |
| switch (flat->hdr.type) { |
| case BINDER_TYPE_BINDER: { |
| sp<IBinder> binder = |
| sp<IBinder>::fromExisting(reinterpret_cast<IBinder*>(flat->cookie)); |
| return finishUnflattenBinder(binder, out); |
| } |
| case BINDER_TYPE_HANDLE: { |
| sp<IBinder> binder = |
| ProcessState::self()->getStrongProxyForHandle(flat->handle); |
| return finishUnflattenBinder(binder, out); |
| } |
| } |
| } |
| return BAD_TYPE; |
| } |
| |
| // --------------------------------------------------------------------------- |
| |
| Parcel::Parcel() |
| { |
| LOG_ALLOC("Parcel %p: constructing", this); |
| initState(); |
| } |
| |
| Parcel::~Parcel() |
| { |
| freeDataNoInit(); |
| LOG_ALLOC("Parcel %p: destroyed", this); |
| } |
| |
| size_t Parcel::getGlobalAllocSize() { |
| return gParcelGlobalAllocSize.load(); |
| } |
| |
| size_t Parcel::getGlobalAllocCount() { |
| return gParcelGlobalAllocCount.load(); |
| } |
| |
| const uint8_t* Parcel::data() const |
| { |
| return mData; |
| } |
| |
| size_t Parcel::dataSize() const |
| { |
| return (mDataSize > mDataPos ? mDataSize : mDataPos); |
| } |
| |
| size_t Parcel::dataAvail() const |
| { |
| size_t result = dataSize() - dataPosition(); |
| if (result > INT32_MAX) { |
| LOG_ALWAYS_FATAL("result too big: %zu", result); |
| } |
| return result; |
| } |
| |
| size_t Parcel::dataPosition() const |
| { |
| return mDataPos; |
| } |
| |
| size_t Parcel::dataCapacity() const |
| { |
| return mDataCapacity; |
| } |
| |
| status_t Parcel::setDataSize(size_t size) |
| { |
| if (size > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| status_t err; |
| err = continueWrite(size); |
| if (err == NO_ERROR) { |
| mDataSize = size; |
| ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize); |
| } |
| return err; |
| } |
| |
| void Parcel::setDataPosition(size_t pos) const |
| { |
| if (pos > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| LOG_ALWAYS_FATAL("pos too big: %zu", pos); |
| } |
| |
| mDataPos = pos; |
| mNextObjectHint = 0; |
| mObjectsSorted = false; |
| } |
| |
| status_t Parcel::setDataCapacity(size_t size) |
| { |
| if (size > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| if (size > mDataCapacity) return continueWrite(size); |
| return NO_ERROR; |
| } |
| |
| status_t Parcel::setData(const uint8_t* buffer, size_t len) |
| { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| status_t err = restartWrite(len); |
| if (err == NO_ERROR) { |
| memcpy(const_cast<uint8_t*>(data()), buffer, len); |
| mDataSize = len; |
| mFdsKnown = false; |
| } |
| return err; |
| } |
| |
| status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len) |
| { |
| if (parcel->isForRpc() != isForRpc()) { |
| ALOGE("Cannot append Parcel of one format to another."); |
| return BAD_TYPE; |
| } |
| |
| status_t err; |
| const uint8_t *data = parcel->mData; |
| const binder_size_t *objects = parcel->mObjects; |
| size_t size = parcel->mObjectsSize; |
| int startPos = mDataPos; |
| int firstIndex = -1, lastIndex = -2; |
| |
| if (len == 0) { |
| return NO_ERROR; |
| } |
| |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| // range checks against the source parcel size |
| if ((offset > parcel->mDataSize) |
| || (len > parcel->mDataSize) |
| || (offset + len > parcel->mDataSize)) { |
| return BAD_VALUE; |
| } |
| |
| // Count objects in range |
| for (int i = 0; i < (int) size; i++) { |
| size_t off = objects[i]; |
| if ((off >= offset) && (off + sizeof(flat_binder_object) <= offset + len)) { |
| if (firstIndex == -1) { |
| firstIndex = i; |
| } |
| lastIndex = i; |
| } |
| } |
| int numObjects = lastIndex - firstIndex + 1; |
| |
| if ((mDataSize+len) > mDataCapacity) { |
| // grow data |
| err = growData(len); |
| if (err != NO_ERROR) { |
| return err; |
| } |
| } |
| |
| // append data |
| memcpy(mData + mDataPos, data + offset, len); |
| mDataPos += len; |
| mDataSize += len; |
| |
| err = NO_ERROR; |
| |
| if (numObjects > 0) { |
| const sp<ProcessState> proc(ProcessState::self()); |
| // grow objects |
| if (mObjectsCapacity < mObjectsSize + numObjects) { |
| if ((size_t) numObjects > SIZE_MAX - mObjectsSize) return NO_MEMORY; // overflow |
| if (mObjectsSize + numObjects > SIZE_MAX / 3) return NO_MEMORY; // overflow |
| size_t newSize = ((mObjectsSize + numObjects)*3)/2; |
| if (newSize > SIZE_MAX / sizeof(binder_size_t)) return NO_MEMORY; // overflow |
| binder_size_t *objects = |
| (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); |
| if (objects == (binder_size_t*)nullptr) { |
| return NO_MEMORY; |
| } |
| mObjects = objects; |
| mObjectsCapacity = newSize; |
| } |
| |
| // append and acquire objects |
| int idx = mObjectsSize; |
| for (int i = firstIndex; i <= lastIndex; i++) { |
| size_t off = objects[i] - offset + startPos; |
| mObjects[idx++] = off; |
| mObjectsSize++; |
| |
| flat_binder_object* flat |
| = reinterpret_cast<flat_binder_object*>(mData + off); |
| acquire_object(proc, *flat, this, &mOpenAshmemSize); |
| |
| if (flat->hdr.type == BINDER_TYPE_FD) { |
| // If this is a file descriptor, we need to dup it so the |
| // new Parcel now owns its own fd, and can declare that we |
| // officially know we have fds. |
| flat->handle = fcntl(flat->handle, F_DUPFD_CLOEXEC, 0); |
| flat->cookie = 1; |
| mHasFds = mFdsKnown = true; |
| if (!mAllowFds) { |
| err = FDS_NOT_ALLOWED; |
| } |
| } |
| } |
| } |
| |
| return err; |
| } |
| |
| int Parcel::compareData(const Parcel& other) { |
| size_t size = dataSize(); |
| if (size != other.dataSize()) { |
| return size < other.dataSize() ? -1 : 1; |
| } |
| return memcmp(data(), other.data(), size); |
| } |
| |
| bool Parcel::allowFds() const |
| { |
| return mAllowFds; |
| } |
| |
| bool Parcel::pushAllowFds(bool allowFds) |
| { |
| const bool origValue = mAllowFds; |
| if (!allowFds) { |
| mAllowFds = false; |
| } |
| return origValue; |
| } |
| |
| void Parcel::restoreAllowFds(bool lastValue) |
| { |
| mAllowFds = lastValue; |
| } |
| |
| bool Parcel::hasFileDescriptors() const |
| { |
| if (!mFdsKnown) { |
| scanForFds(); |
| } |
| return mHasFds; |
| } |
| |
| void Parcel::markSensitive() const |
| { |
| mDeallocZero = true; |
| } |
| |
| void Parcel::markForBinder(const sp<IBinder>& binder) { |
| LOG_ALWAYS_FATAL_IF(mData != nullptr, "format must be set before data is written"); |
| |
| if (binder && binder->remoteBinder() && binder->remoteBinder()->isRpcBinder()) { |
| markForRpc(binder->remoteBinder()->getPrivateAccessorForId().rpcSession()); |
| } |
| } |
| |
| void Parcel::markForRpc(const sp<RpcSession>& session) { |
| LOG_ALWAYS_FATAL_IF(mData != nullptr && mOwner == nullptr, |
| "format must be set before data is written OR on IPC data"); |
| |
| LOG_ALWAYS_FATAL_IF(session == nullptr, "markForRpc requires session"); |
| mSession = session; |
| } |
| |
| bool Parcel::isForRpc() const { |
| return mSession != nullptr; |
| } |
| |
| void Parcel::updateWorkSourceRequestHeaderPosition() const { |
| // Only update the request headers once. We only want to point |
| // to the first headers read/written. |
| if (!mRequestHeaderPresent) { |
| mWorkSourceRequestHeaderPosition = dataPosition(); |
| mRequestHeaderPresent = true; |
| } |
| } |
| |
| #if defined(__ANDROID_VNDK__) |
| constexpr int32_t kHeader = B_PACK_CHARS('V', 'N', 'D', 'R'); |
| #else |
| constexpr int32_t kHeader = B_PACK_CHARS('S', 'Y', 'S', 'T'); |
| #endif |
| |
| // Write RPC headers. (previously just the interface token) |
| status_t Parcel::writeInterfaceToken(const String16& interface) |
| { |
| return writeInterfaceToken(interface.string(), interface.size()); |
| } |
| |
| status_t Parcel::writeInterfaceToken(const char16_t* str, size_t len) { |
| if (CC_LIKELY(!isForRpc())) { |
| const IPCThreadState* threadState = IPCThreadState::self(); |
| writeInt32(threadState->getStrictModePolicy() | STRICT_MODE_PENALTY_GATHER); |
| updateWorkSourceRequestHeaderPosition(); |
| writeInt32(threadState->shouldPropagateWorkSource() ? threadState->getCallingWorkSourceUid() |
| : IPCThreadState::kUnsetWorkSource); |
| writeInt32(kHeader); |
| } |
| |
| // currently the interface identification token is just its name as a string |
| return writeString16(str, len); |
| } |
| |
| bool Parcel::replaceCallingWorkSourceUid(uid_t uid) |
| { |
| if (!mRequestHeaderPresent) { |
| return false; |
| } |
| |
| const size_t initialPosition = dataPosition(); |
| setDataPosition(mWorkSourceRequestHeaderPosition); |
| status_t err = writeInt32(uid); |
| setDataPosition(initialPosition); |
| return err == NO_ERROR; |
| } |
| |
| uid_t Parcel::readCallingWorkSourceUid() const |
| { |
| if (!mRequestHeaderPresent) { |
| return IPCThreadState::kUnsetWorkSource; |
| } |
| |
| const size_t initialPosition = dataPosition(); |
| setDataPosition(mWorkSourceRequestHeaderPosition); |
| uid_t uid = readInt32(); |
| setDataPosition(initialPosition); |
| return uid; |
| } |
| |
| bool Parcel::checkInterface(IBinder* binder) const |
| { |
| return enforceInterface(binder->getInterfaceDescriptor()); |
| } |
| |
| bool Parcel::enforceInterface(const String16& interface, |
| IPCThreadState* threadState) const |
| { |
| return enforceInterface(interface.string(), interface.size(), threadState); |
| } |
| |
| bool Parcel::enforceInterface(const char16_t* interface, |
| size_t len, |
| IPCThreadState* threadState) const |
| { |
| if (CC_LIKELY(!isForRpc())) { |
| // StrictModePolicy. |
| int32_t strictPolicy = readInt32(); |
| if (threadState == nullptr) { |
| threadState = IPCThreadState::self(); |
| } |
| if ((threadState->getLastTransactionBinderFlags() & IBinder::FLAG_ONEWAY) != 0) { |
| // For one-way calls, the callee is running entirely |
| // disconnected from the caller, so disable StrictMode entirely. |
| // Not only does disk/network usage not impact the caller, but |
| // there's no way to communicate back violations anyway. |
| threadState->setStrictModePolicy(0); |
| } else { |
| threadState->setStrictModePolicy(strictPolicy); |
| } |
| // WorkSource. |
| updateWorkSourceRequestHeaderPosition(); |
| int32_t workSource = readInt32(); |
| threadState->setCallingWorkSourceUidWithoutPropagation(workSource); |
| // vendor header |
| int32_t header = readInt32(); |
| if (header != kHeader) { |
| ALOGE("Expecting header 0x%x but found 0x%x. Mixing copies of libbinder?", kHeader, |
| header); |
| return false; |
| } |
| } |
| |
| // Interface descriptor. |
| size_t parcel_interface_len; |
| const char16_t* parcel_interface = readString16Inplace(&parcel_interface_len); |
| if (len == parcel_interface_len && |
| (!len || !memcmp(parcel_interface, interface, len * sizeof (char16_t)))) { |
| return true; |
| } else { |
| ALOGW("**** enforceInterface() expected '%s' but read '%s'", |
| String8(interface, len).string(), |
| String8(parcel_interface, parcel_interface_len).string()); |
| return false; |
| } |
| } |
| |
| size_t Parcel::objectsCount() const |
| { |
| return mObjectsSize; |
| } |
| |
| status_t Parcel::errorCheck() const |
| { |
| return mError; |
| } |
| |
| void Parcel::setError(status_t err) |
| { |
| mError = err; |
| } |
| |
| status_t Parcel::finishWrite(size_t len) |
| { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| //printf("Finish write of %d\n", len); |
| mDataPos += len; |
| ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos); |
| if (mDataPos > mDataSize) { |
| mDataSize = mDataPos; |
| ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize); |
| } |
| //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); |
| return NO_ERROR; |
| } |
| |
| status_t Parcel::writeUnpadded(const void* data, size_t len) |
| { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| size_t end = mDataPos + len; |
| if (end < mDataPos) { |
| // integer overflow |
| return BAD_VALUE; |
| } |
| |
| if (end <= mDataCapacity) { |
| restart_write: |
| memcpy(mData+mDataPos, data, len); |
| return finishWrite(len); |
| } |
| |
| status_t err = growData(len); |
| if (err == NO_ERROR) goto restart_write; |
| return err; |
| } |
| |
| status_t Parcel::write(const void* data, size_t len) |
| { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| void* const d = writeInplace(len); |
| if (d) { |
| memcpy(d, data, len); |
| return NO_ERROR; |
| } |
| return mError; |
| } |
| |
| void* Parcel::writeInplace(size_t len) |
| { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return nullptr; |
| } |
| |
| const size_t padded = pad_size(len); |
| |
| // sanity check for integer overflow |
| if (mDataPos+padded < mDataPos) { |
| return nullptr; |
| } |
| |
| if ((mDataPos+padded) <= mDataCapacity) { |
| restart_write: |
| //printf("Writing %ld bytes, padded to %ld\n", len, padded); |
| uint8_t* const data = mData+mDataPos; |
| |
| // Need to pad at end? |
| if (padded != len) { |
| #if BYTE_ORDER == BIG_ENDIAN |
| static const uint32_t mask[4] = { |
| 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 |
| }; |
| #endif |
| #if BYTE_ORDER == LITTLE_ENDIAN |
| static const uint32_t mask[4] = { |
| 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff |
| }; |
| #endif |
| //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], |
| // *reinterpret_cast<void**>(data+padded-4)); |
| *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; |
| } |
| |
| finishWrite(padded); |
| return data; |
| } |
| |
| status_t err = growData(padded); |
| if (err == NO_ERROR) goto restart_write; |
| return nullptr; |
| } |
| |
| status_t Parcel::writeUtf8AsUtf16(const std::string& str) { |
| const uint8_t* strData = (uint8_t*)str.data(); |
| const size_t strLen= str.length(); |
| const ssize_t utf16Len = utf8_to_utf16_length(strData, strLen); |
| if (utf16Len < 0 || utf16Len > std::numeric_limits<int32_t>::max()) { |
| return BAD_VALUE; |
| } |
| |
| status_t err = writeInt32(utf16Len); |
| if (err) { |
| return err; |
| } |
| |
| // Allocate enough bytes to hold our converted string and its terminating NULL. |
| void* dst = writeInplace((utf16Len + 1) * sizeof(char16_t)); |
| if (!dst) { |
| return NO_MEMORY; |
| } |
| |
| utf8_to_utf16(strData, strLen, (char16_t*)dst, (size_t) utf16Len + 1); |
| |
| return NO_ERROR; |
| } |
| |
| |
| status_t Parcel::writeUtf8AsUtf16(const std::optional<std::string>& str) { return writeData(str); } |
| status_t Parcel::writeUtf8AsUtf16(const std::unique_ptr<std::string>& str) { return writeData(str); } |
| |
| status_t Parcel::writeString16(const std::optional<String16>& str) { return writeData(str); } |
| status_t Parcel::writeString16(const std::unique_ptr<String16>& str) { return writeData(str); } |
| |
| status_t Parcel::writeByteVector(const std::vector<int8_t>& val) { return writeData(val); } |
| status_t Parcel::writeByteVector(const std::optional<std::vector<int8_t>>& val) { return writeData(val); } |
| status_t Parcel::writeByteVector(const std::unique_ptr<std::vector<int8_t>>& val) { return writeData(val); } |
| status_t Parcel::writeByteVector(const std::vector<uint8_t>& val) { return writeData(val); } |
| status_t Parcel::writeByteVector(const std::optional<std::vector<uint8_t>>& val) { return writeData(val); } |
| status_t Parcel::writeByteVector(const std::unique_ptr<std::vector<uint8_t>>& val){ return writeData(val); } |
| status_t Parcel::writeInt32Vector(const std::vector<int32_t>& val) { return writeData(val); } |
| status_t Parcel::writeInt32Vector(const std::optional<std::vector<int32_t>>& val) { return writeData(val); } |
| status_t Parcel::writeInt32Vector(const std::unique_ptr<std::vector<int32_t>>& val) { return writeData(val); } |
| status_t Parcel::writeInt64Vector(const std::vector<int64_t>& val) { return writeData(val); } |
| status_t Parcel::writeInt64Vector(const std::optional<std::vector<int64_t>>& val) { return writeData(val); } |
| status_t Parcel::writeInt64Vector(const std::unique_ptr<std::vector<int64_t>>& val) { return writeData(val); } |
| status_t Parcel::writeUint64Vector(const std::vector<uint64_t>& val) { return writeData(val); } |
| status_t Parcel::writeUint64Vector(const std::optional<std::vector<uint64_t>>& val) { return writeData(val); } |
| status_t Parcel::writeUint64Vector(const std::unique_ptr<std::vector<uint64_t>>& val) { return writeData(val); } |
| status_t Parcel::writeFloatVector(const std::vector<float>& val) { return writeData(val); } |
| status_t Parcel::writeFloatVector(const std::optional<std::vector<float>>& val) { return writeData(val); } |
| status_t Parcel::writeFloatVector(const std::unique_ptr<std::vector<float>>& val) { return writeData(val); } |
| status_t Parcel::writeDoubleVector(const std::vector<double>& val) { return writeData(val); } |
| status_t Parcel::writeDoubleVector(const std::optional<std::vector<double>>& val) { return writeData(val); } |
| status_t Parcel::writeDoubleVector(const std::unique_ptr<std::vector<double>>& val) { return writeData(val); } |
| status_t Parcel::writeBoolVector(const std::vector<bool>& val) { return writeData(val); } |
| status_t Parcel::writeBoolVector(const std::optional<std::vector<bool>>& val) { return writeData(val); } |
| status_t Parcel::writeBoolVector(const std::unique_ptr<std::vector<bool>>& val) { return writeData(val); } |
| status_t Parcel::writeCharVector(const std::vector<char16_t>& val) { return writeData(val); } |
| status_t Parcel::writeCharVector(const std::optional<std::vector<char16_t>>& val) { return writeData(val); } |
| status_t Parcel::writeCharVector(const std::unique_ptr<std::vector<char16_t>>& val) { return writeData(val); } |
| |
| status_t Parcel::writeString16Vector(const std::vector<String16>& val) { return writeData(val); } |
| status_t Parcel::writeString16Vector( |
| const std::optional<std::vector<std::optional<String16>>>& val) { return writeData(val); } |
| status_t Parcel::writeString16Vector( |
| const std::unique_ptr<std::vector<std::unique_ptr<String16>>>& val) { return writeData(val); } |
| status_t Parcel::writeUtf8VectorAsUtf16Vector( |
| const std::optional<std::vector<std::optional<std::string>>>& val) { return writeData(val); } |
| status_t Parcel::writeUtf8VectorAsUtf16Vector( |
| const std::unique_ptr<std::vector<std::unique_ptr<std::string>>>& val) { return writeData(val); } |
| status_t Parcel::writeUtf8VectorAsUtf16Vector(const std::vector<std::string>& val) { return writeData(val); } |
| |
| status_t Parcel::writeUniqueFileDescriptorVector(const std::vector<base::unique_fd>& val) { return writeData(val); } |
| status_t Parcel::writeUniqueFileDescriptorVector(const std::optional<std::vector<base::unique_fd>>& val) { return writeData(val); } |
| status_t Parcel::writeUniqueFileDescriptorVector(const std::unique_ptr<std::vector<base::unique_fd>>& val) { return writeData(val); } |
| |
| status_t Parcel::writeStrongBinderVector(const std::vector<sp<IBinder>>& val) { return writeData(val); } |
| status_t Parcel::writeStrongBinderVector(const std::optional<std::vector<sp<IBinder>>>& val) { return writeData(val); } |
| status_t Parcel::writeStrongBinderVector(const std::unique_ptr<std::vector<sp<IBinder>>>& val) { return writeData(val); } |
| |
| status_t Parcel::writeParcelable(const Parcelable& parcelable) { return writeData(parcelable); } |
| |
| status_t Parcel::readUtf8FromUtf16(std::optional<std::string>* str) const { return readData(str); } |
| status_t Parcel::readUtf8FromUtf16(std::unique_ptr<std::string>* str) const { return readData(str); } |
| |
| status_t Parcel::readString16(std::optional<String16>* pArg) const { return readData(pArg); } |
| status_t Parcel::readString16(std::unique_ptr<String16>* pArg) const { return readData(pArg); } |
| |
| status_t Parcel::readByteVector(std::vector<int8_t>* val) const { return readData(val); } |
| status_t Parcel::readByteVector(std::vector<uint8_t>* val) const { return readData(val); } |
| status_t Parcel::readByteVector(std::optional<std::vector<int8_t>>* val) const { return readData(val); } |
| status_t Parcel::readByteVector(std::unique_ptr<std::vector<int8_t>>* val) const { return readData(val); } |
| status_t Parcel::readByteVector(std::optional<std::vector<uint8_t>>* val) const { return readData(val); } |
| status_t Parcel::readByteVector(std::unique_ptr<std::vector<uint8_t>>* val) const { return readData(val); } |
| status_t Parcel::readInt32Vector(std::optional<std::vector<int32_t>>* val) const { return readData(val); } |
| status_t Parcel::readInt32Vector(std::unique_ptr<std::vector<int32_t>>* val) const { return readData(val); } |
| status_t Parcel::readInt32Vector(std::vector<int32_t>* val) const { return readData(val); } |
| status_t Parcel::readInt64Vector(std::optional<std::vector<int64_t>>* val) const { return readData(val); } |
| status_t Parcel::readInt64Vector(std::unique_ptr<std::vector<int64_t>>* val) const { return readData(val); } |
| status_t Parcel::readInt64Vector(std::vector<int64_t>* val) const { return readData(val); } |
| status_t Parcel::readUint64Vector(std::optional<std::vector<uint64_t>>* val) const { return readData(val); } |
| status_t Parcel::readUint64Vector(std::unique_ptr<std::vector<uint64_t>>* val) const { return readData(val); } |
| status_t Parcel::readUint64Vector(std::vector<uint64_t>* val) const { return readData(val); } |
| status_t Parcel::readFloatVector(std::optional<std::vector<float>>* val) const { return readData(val); } |
| status_t Parcel::readFloatVector(std::unique_ptr<std::vector<float>>* val) const { return readData(val); } |
| status_t Parcel::readFloatVector(std::vector<float>* val) const { return readData(val); } |
| status_t Parcel::readDoubleVector(std::optional<std::vector<double>>* val) const { return readData(val); } |
| status_t Parcel::readDoubleVector(std::unique_ptr<std::vector<double>>* val) const { return readData(val); } |
| status_t Parcel::readDoubleVector(std::vector<double>* val) const { return readData(val); } |
| status_t Parcel::readBoolVector(std::optional<std::vector<bool>>* val) const { return readData(val); } |
| status_t Parcel::readBoolVector(std::unique_ptr<std::vector<bool>>* val) const { return readData(val); } |
| status_t Parcel::readBoolVector(std::vector<bool>* val) const { return readData(val); } |
| status_t Parcel::readCharVector(std::optional<std::vector<char16_t>>* val) const { return readData(val); } |
| status_t Parcel::readCharVector(std::unique_ptr<std::vector<char16_t>>* val) const { return readData(val); } |
| status_t Parcel::readCharVector(std::vector<char16_t>* val) const { return readData(val); } |
| |
| status_t Parcel::readString16Vector( |
| std::optional<std::vector<std::optional<String16>>>* val) const { return readData(val); } |
| status_t Parcel::readString16Vector( |
| std::unique_ptr<std::vector<std::unique_ptr<String16>>>* val) const { return readData(val); } |
| status_t Parcel::readString16Vector(std::vector<String16>* val) const { return readData(val); } |
| status_t Parcel::readUtf8VectorFromUtf16Vector( |
| std::optional<std::vector<std::optional<std::string>>>* val) const { return readData(val); } |
| status_t Parcel::readUtf8VectorFromUtf16Vector( |
| std::unique_ptr<std::vector<std::unique_ptr<std::string>>>* val) const { return readData(val); } |
| status_t Parcel::readUtf8VectorFromUtf16Vector(std::vector<std::string>* val) const { return readData(val); } |
| |
| status_t Parcel::readUniqueFileDescriptorVector(std::optional<std::vector<base::unique_fd>>* val) const { return readData(val); } |
| status_t Parcel::readUniqueFileDescriptorVector(std::unique_ptr<std::vector<base::unique_fd>>* val) const { return readData(val); } |
| status_t Parcel::readUniqueFileDescriptorVector(std::vector<base::unique_fd>* val) const { return readData(val); } |
| |
| status_t Parcel::readStrongBinderVector(std::optional<std::vector<sp<IBinder>>>* val) const { return readData(val); } |
| status_t Parcel::readStrongBinderVector(std::unique_ptr<std::vector<sp<IBinder>>>* val) const { return readData(val); } |
| status_t Parcel::readStrongBinderVector(std::vector<sp<IBinder>>* val) const { return readData(val); } |
| |
| status_t Parcel::readParcelable(Parcelable* parcelable) const { return readData(parcelable); } |
| |
| status_t Parcel::writeInt32(int32_t val) |
| { |
| return writeAligned(val); |
| } |
| |
| status_t Parcel::writeUint32(uint32_t val) |
| { |
| return writeAligned(val); |
| } |
| |
| status_t Parcel::writeInt32Array(size_t len, const int32_t *val) { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| if (!val) { |
| return writeInt32(-1); |
| } |
| status_t ret = writeInt32(static_cast<uint32_t>(len)); |
| if (ret == NO_ERROR) { |
| ret = write(val, len * sizeof(*val)); |
| } |
| return ret; |
| } |
| status_t Parcel::writeByteArray(size_t len, const uint8_t *val) { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| if (!val) { |
| return writeInt32(-1); |
| } |
| status_t ret = writeInt32(static_cast<uint32_t>(len)); |
| if (ret == NO_ERROR) { |
| ret = write(val, len * sizeof(*val)); |
| } |
| return ret; |
| } |
| |
| status_t Parcel::writeBool(bool val) |
| { |
| return writeInt32(int32_t(val)); |
| } |
| |
| status_t Parcel::writeChar(char16_t val) |
| { |
| return writeInt32(int32_t(val)); |
| } |
| |
| status_t Parcel::writeByte(int8_t val) |
| { |
| return writeInt32(int32_t(val)); |
| } |
| |
| status_t Parcel::writeInt64(int64_t val) |
| { |
| return writeAligned(val); |
| } |
| |
| status_t Parcel::writeUint64(uint64_t val) |
| { |
| return writeAligned(val); |
| } |
| |
| status_t Parcel::writePointer(uintptr_t val) |
| { |
| return writeAligned<binder_uintptr_t>(val); |
| } |
| |
| status_t Parcel::writeFloat(float val) |
| { |
| return writeAligned(val); |
| } |
| |
| #if defined(__mips__) && defined(__mips_hard_float) |
| |
| status_t Parcel::writeDouble(double val) |
| { |
| union { |
| double d; |
| unsigned long long ll; |
| } u; |
| u.d = val; |
| return writeAligned(u.ll); |
| } |
| |
| #else |
| |
| status_t Parcel::writeDouble(double val) |
| { |
| return writeAligned(val); |
| } |
| |
| #endif |
| |
| status_t Parcel::writeCString(const char* str) |
| { |
| return write(str, strlen(str)+1); |
| } |
| |
| status_t Parcel::writeString8(const String8& str) |
| { |
| return writeString8(str.string(), str.size()); |
| } |
| |
| status_t Parcel::writeString8(const char* str, size_t len) |
| { |
| if (str == nullptr) return writeInt32(-1); |
| |
| // NOTE: Keep this logic in sync with android_os_Parcel.cpp |
| status_t err = writeInt32(len); |
| if (err == NO_ERROR) { |
| uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char)); |
| if (data) { |
| memcpy(data, str, len); |
| *reinterpret_cast<char*>(data+len) = 0; |
| return NO_ERROR; |
| } |
| err = mError; |
| } |
| return err; |
| } |
| |
| status_t Parcel::writeString16(const String16& str) |
| { |
| return writeString16(str.string(), str.size()); |
| } |
| |
| status_t Parcel::writeString16(const char16_t* str, size_t len) |
| { |
| if (str == nullptr) return writeInt32(-1); |
| |
| // NOTE: Keep this logic in sync with android_os_Parcel.cpp |
| status_t err = writeInt32(len); |
| if (err == NO_ERROR) { |
| len *= sizeof(char16_t); |
| uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); |
| if (data) { |
| memcpy(data, str, len); |
| *reinterpret_cast<char16_t*>(data+len) = 0; |
| return NO_ERROR; |
| } |
| err = mError; |
| } |
| return err; |
| } |
| |
| status_t Parcel::writeStrongBinder(const sp<IBinder>& val) |
| { |
| return flattenBinder(val); |
| } |
| |
| |
| status_t Parcel::writeRawNullableParcelable(const Parcelable* parcelable) { |
| if (!parcelable) { |
| return writeInt32(0); |
| } |
| |
| return writeParcelable(*parcelable); |
| } |
| |
| status_t Parcel::writeNativeHandle(const native_handle* handle) |
| { |
| if (!handle || handle->version != sizeof(native_handle)) |
| return BAD_TYPE; |
| |
| status_t err; |
| err = writeInt32(handle->numFds); |
| if (err != NO_ERROR) return err; |
| |
| err = writeInt32(handle->numInts); |
| if (err != NO_ERROR) return err; |
| |
| for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) |
| err = writeDupFileDescriptor(handle->data[i]); |
| |
| if (err != NO_ERROR) { |
| ALOGD("write native handle, write dup fd failed"); |
| return err; |
| } |
| err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); |
| return err; |
| } |
| |
| status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership) |
| { |
| if (isForRpc()) { |
| ALOGE("Cannot write file descriptor to remote binder."); |
| return BAD_TYPE; |
| } |
| |
| flat_binder_object obj; |
| obj.hdr.type = BINDER_TYPE_FD; |
| obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; |
| obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ |
| obj.handle = fd; |
| obj.cookie = takeOwnership ? 1 : 0; |
| return writeObject(obj, true); |
| } |
| |
| status_t Parcel::writeDupFileDescriptor(int fd) |
| { |
| int dupFd = fcntl(fd, F_DUPFD_CLOEXEC, 0); |
| if (dupFd < 0) { |
| return -errno; |
| } |
| status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/); |
| if (err != OK) { |
| close(dupFd); |
| } |
| return err; |
| } |
| |
| status_t Parcel::writeParcelFileDescriptor(int fd, bool takeOwnership) |
| { |
| writeInt32(0); |
| return writeFileDescriptor(fd, takeOwnership); |
| } |
| |
| status_t Parcel::writeDupParcelFileDescriptor(int fd) |
| { |
| int dupFd = fcntl(fd, F_DUPFD_CLOEXEC, 0); |
| if (dupFd < 0) { |
| return -errno; |
| } |
| status_t err = writeParcelFileDescriptor(dupFd, true /*takeOwnership*/); |
| if (err != OK) { |
| close(dupFd); |
| } |
| return err; |
| } |
| |
| status_t Parcel::writeUniqueFileDescriptor(const base::unique_fd& fd) { |
| return writeDupFileDescriptor(fd.get()); |
| } |
| |
| status_t Parcel::writeBlob(size_t len, bool mutableCopy, WritableBlob* outBlob) |
| { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| status_t status; |
| if (!mAllowFds || len <= BLOB_INPLACE_LIMIT) { |
| ALOGV("writeBlob: write in place"); |
| status = writeInt32(BLOB_INPLACE); |
| if (status) return status; |
| |
| void* ptr = writeInplace(len); |
| if (!ptr) return NO_MEMORY; |
| |
| outBlob->init(-1, ptr, len, false); |
| return NO_ERROR; |
| } |
| |
| ALOGV("writeBlob: write to ashmem"); |
| int fd = ashmem_create_region("Parcel Blob", len); |
| if (fd < 0) return NO_MEMORY; |
| |
| int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); |
| if (result < 0) { |
| status = result; |
| } else { |
| void* ptr = ::mmap(nullptr, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
| if (ptr == MAP_FAILED) { |
| status = -errno; |
| } else { |
| if (!mutableCopy) { |
| result = ashmem_set_prot_region(fd, PROT_READ); |
| } |
| if (result < 0) { |
| status = result; |
| } else { |
| status = writeInt32(mutableCopy ? BLOB_ASHMEM_MUTABLE : BLOB_ASHMEM_IMMUTABLE); |
| if (!status) { |
| status = writeFileDescriptor(fd, true /*takeOwnership*/); |
| if (!status) { |
| outBlob->init(fd, ptr, len, mutableCopy); |
| return NO_ERROR; |
| } |
| } |
| } |
| } |
| ::munmap(ptr, len); |
| } |
| ::close(fd); |
| return status; |
| } |
| |
| status_t Parcel::writeDupImmutableBlobFileDescriptor(int fd) |
| { |
| // Must match up with what's done in writeBlob. |
| if (!mAllowFds) return FDS_NOT_ALLOWED; |
| status_t status = writeInt32(BLOB_ASHMEM_IMMUTABLE); |
| if (status) return status; |
| return writeDupFileDescriptor(fd); |
| } |
| |
| status_t Parcel::write(const FlattenableHelperInterface& val) |
| { |
| status_t err; |
| |
| // size if needed |
| const size_t len = val.getFlattenedSize(); |
| const size_t fd_count = val.getFdCount(); |
| |
| if ((len > INT32_MAX) || (fd_count >= gMaxFds)) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| err = this->writeInt32(len); |
| if (err) return err; |
| |
| err = this->writeInt32(fd_count); |
| if (err) return err; |
| |
| // payload |
| void* const buf = this->writeInplace(len); |
| if (buf == nullptr) |
| return BAD_VALUE; |
| |
| int* fds = nullptr; |
| if (fd_count) { |
| fds = new (std::nothrow) int[fd_count]; |
| if (fds == nullptr) { |
| ALOGE("write: failed to allocate requested %zu fds", fd_count); |
| return BAD_VALUE; |
| } |
| } |
| |
| err = val.flatten(buf, len, fds, fd_count); |
| for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { |
| err = this->writeDupFileDescriptor( fds[i] ); |
| } |
| |
| if (fd_count) { |
| delete [] fds; |
| } |
| |
| return err; |
| } |
| |
| status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) |
| { |
| const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; |
| const bool enoughObjects = mObjectsSize < mObjectsCapacity; |
| if (enoughData && enoughObjects) { |
| restart_write: |
| *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; |
| |
| // remember if it's a file descriptor |
| if (val.hdr.type == BINDER_TYPE_FD) { |
| if (!mAllowFds) { |
| // fail before modifying our object index |
| return FDS_NOT_ALLOWED; |
| } |
| mHasFds = mFdsKnown = true; |
| } |
| |
| // Need to write meta-data? |
| if (nullMetaData || val.binder != 0) { |
| mObjects[mObjectsSize] = mDataPos; |
| acquire_object(ProcessState::self(), val, this, &mOpenAshmemSize); |
| mObjectsSize++; |
| } |
| |
| return finishWrite(sizeof(flat_binder_object)); |
| } |
| |
| if (!enoughData) { |
| const status_t err = growData(sizeof(val)); |
| if (err != NO_ERROR) return err; |
| } |
| if (!enoughObjects) { |
| if (mObjectsSize > SIZE_MAX - 2) return NO_MEMORY; // overflow |
| if ((mObjectsSize + 2) > SIZE_MAX / 3) return NO_MEMORY; // overflow |
| size_t newSize = ((mObjectsSize+2)*3)/2; |
| if (newSize > SIZE_MAX / sizeof(binder_size_t)) return NO_MEMORY; // overflow |
| binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); |
| if (objects == nullptr) return NO_MEMORY; |
| mObjects = objects; |
| mObjectsCapacity = newSize; |
| } |
| |
| goto restart_write; |
| } |
| |
| status_t Parcel::writeNoException() |
| { |
| binder::Status status; |
| return status.writeToParcel(this); |
| } |
| |
| status_t Parcel::validateReadData(size_t upperBound) const |
| { |
| // Don't allow non-object reads on object data |
| if (mObjectsSorted || mObjectsSize <= 1) { |
| data_sorted: |
| // Expect to check only against the next object |
| if (mNextObjectHint < mObjectsSize && upperBound > mObjects[mNextObjectHint]) { |
| // For some reason the current read position is greater than the next object |
| // hint. Iterate until we find the right object |
| size_t nextObject = mNextObjectHint; |
| do { |
| if (mDataPos < mObjects[nextObject] + sizeof(flat_binder_object)) { |
| // Requested info overlaps with an object |
| ALOGE("Attempt to read from protected data in Parcel %p", this); |
| return PERMISSION_DENIED; |
| } |
| nextObject++; |
| } while (nextObject < mObjectsSize && upperBound > mObjects[nextObject]); |
| mNextObjectHint = nextObject; |
| } |
| return NO_ERROR; |
| } |
| // Quickly determine if mObjects is sorted. |
| binder_size_t* currObj = mObjects + mObjectsSize - 1; |
| binder_size_t* prevObj = currObj; |
| while (currObj > mObjects) { |
| prevObj--; |
| if(*prevObj > *currObj) { |
| goto data_unsorted; |
| } |
| currObj--; |
| } |
| mObjectsSorted = true; |
| goto data_sorted; |
| |
| data_unsorted: |
| // Insertion Sort mObjects |
| // Great for mostly sorted lists. If randomly sorted or reverse ordered mObjects become common, |
| // switch to std::sort(mObjects, mObjects + mObjectsSize); |
| for (binder_size_t* iter0 = mObjects + 1; iter0 < mObjects + mObjectsSize; iter0++) { |
| binder_size_t temp = *iter0; |
| binder_size_t* iter1 = iter0 - 1; |
| while (iter1 >= mObjects && *iter1 > temp) { |
| *(iter1 + 1) = *iter1; |
| iter1--; |
| } |
| *(iter1 + 1) = temp; |
| } |
| mNextObjectHint = 0; |
| mObjectsSorted = true; |
| goto data_sorted; |
| } |
| |
| status_t Parcel::read(void* outData, size_t len) const |
| { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize |
| && len <= pad_size(len)) { |
| if (mObjectsSize > 0) { |
| status_t err = validateReadData(mDataPos + pad_size(len)); |
| if(err != NO_ERROR) { |
| // Still increment the data position by the expected length |
| mDataPos += pad_size(len); |
| ALOGV("read Setting data pos of %p to %zu", this, mDataPos); |
| return err; |
| } |
| } |
| memcpy(outData, mData+mDataPos, len); |
| mDataPos += pad_size(len); |
| ALOGV("read Setting data pos of %p to %zu", this, mDataPos); |
| return NO_ERROR; |
| } |
| return NOT_ENOUGH_DATA; |
| } |
| |
| const void* Parcel::readInplace(size_t len) const |
| { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return nullptr; |
| } |
| |
| if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize |
| && len <= pad_size(len)) { |
| if (mObjectsSize > 0) { |
| status_t err = validateReadData(mDataPos + pad_size(len)); |
| if(err != NO_ERROR) { |
| // Still increment the data position by the expected length |
| mDataPos += pad_size(len); |
| ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos); |
| return nullptr; |
| } |
| } |
| |
| const void* data = mData+mDataPos; |
| mDataPos += pad_size(len); |
| ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos); |
| return data; |
| } |
| return nullptr; |
| } |
| |
| status_t Parcel::readOutVectorSizeWithCheck(size_t elmSize, int32_t* size) const { |
| if (status_t status = readInt32(size); status != OK) return status; |
| if (*size < 0) return OK; // may be null, client to handle |
| |
| LOG_ALWAYS_FATAL_IF(elmSize > INT32_MAX, "Cannot have element as big as %zu", elmSize); |
| |
| // approximation, can't know max element size (e.g. if it makes heap |
| // allocations) |
| static_assert(sizeof(int) == sizeof(int32_t), "Android is LP64"); |
| int32_t allocationSize; |
| if (__builtin_smul_overflow(elmSize, *size, &allocationSize)) return NO_MEMORY; |
| |
| // High limit of 1MB since something this big could never be returned. Could |
| // probably scope this down, but might impact very specific usecases. |
| constexpr int32_t kMaxAllocationSize = 1 * 1000 * 1000; |
| |
| if (allocationSize >= kMaxAllocationSize) { |
| return NO_MEMORY; |
| } |
| |
| return OK; |
| } |
| |
| template<class T> |
| status_t Parcel::readAligned(T *pArg) const { |
| static_assert(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T)); |
| |
| if ((mDataPos+sizeof(T)) <= mDataSize) { |
| if (mObjectsSize > 0) { |
| status_t err = validateReadData(mDataPos + sizeof(T)); |
| if(err != NO_ERROR) { |
| // Still increment the data position by the expected length |
| mDataPos += sizeof(T); |
| return err; |
| } |
| } |
| |
| const void* data = mData+mDataPos; |
| mDataPos += sizeof(T); |
| *pArg = *reinterpret_cast<const T*>(data); |
| return NO_ERROR; |
| } else { |
| return NOT_ENOUGH_DATA; |
| } |
| } |
| |
| template<class T> |
| T Parcel::readAligned() const { |
| T result; |
| if (readAligned(&result) != NO_ERROR) { |
| result = 0; |
| } |
| |
| return result; |
| } |
| |
| template<class T> |
| status_t Parcel::writeAligned(T val) { |
| static_assert(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T)); |
| |
| if ((mDataPos+sizeof(val)) <= mDataCapacity) { |
| restart_write: |
| *reinterpret_cast<T*>(mData+mDataPos) = val; |
| return finishWrite(sizeof(val)); |
| } |
| |
| status_t err = growData(sizeof(val)); |
| if (err == NO_ERROR) goto restart_write; |
| return err; |
| } |
| |
| status_t Parcel::readInt32(int32_t *pArg) const |
| { |
| return readAligned(pArg); |
| } |
| |
| int32_t Parcel::readInt32() const |
| { |
| return readAligned<int32_t>(); |
| } |
| |
| status_t Parcel::readUint32(uint32_t *pArg) const |
| { |
| return readAligned(pArg); |
| } |
| |
| uint32_t Parcel::readUint32() const |
| { |
| return readAligned<uint32_t>(); |
| } |
| |
| status_t Parcel::readInt64(int64_t *pArg) const |
| { |
| return readAligned(pArg); |
| } |
| |
| |
| int64_t Parcel::readInt64() const |
| { |
| return readAligned<int64_t>(); |
| } |
| |
| status_t Parcel::readUint64(uint64_t *pArg) const |
| { |
| return readAligned(pArg); |
| } |
| |
| uint64_t Parcel::readUint64() const |
| { |
| return readAligned<uint64_t>(); |
| } |
| |
| status_t Parcel::readPointer(uintptr_t *pArg) const |
| { |
| status_t ret; |
| binder_uintptr_t ptr; |
| ret = readAligned(&ptr); |
| if (!ret) |
| *pArg = ptr; |
| return ret; |
| } |
| |
| uintptr_t Parcel::readPointer() const |
| { |
| return readAligned<binder_uintptr_t>(); |
| } |
| |
| |
| status_t Parcel::readFloat(float *pArg) const |
| { |
| return readAligned(pArg); |
| } |
| |
| |
| float Parcel::readFloat() const |
| { |
| return readAligned<float>(); |
| } |
| |
| #if defined(__mips__) && defined(__mips_hard_float) |
| |
| status_t Parcel::readDouble(double *pArg) const |
| { |
| union { |
| double d; |
| unsigned long long ll; |
| } u; |
| u.d = 0; |
| status_t status; |
| status = readAligned(&u.ll); |
| *pArg = u.d; |
| return status; |
| } |
| |
| double Parcel::readDouble() const |
| { |
| union { |
| double d; |
| unsigned long long ll; |
| } u; |
| u.ll = readAligned<unsigned long long>(); |
| return u.d; |
| } |
| |
| #else |
| |
| status_t Parcel::readDouble(double *pArg) const |
| { |
| return readAligned(pArg); |
| } |
| |
| double Parcel::readDouble() const |
| { |
| return readAligned<double>(); |
| } |
| |
| #endif |
| |
| status_t Parcel::readBool(bool *pArg) const |
| { |
| int32_t tmp = 0; |
| status_t ret = readInt32(&tmp); |
| *pArg = (tmp != 0); |
| return ret; |
| } |
| |
| bool Parcel::readBool() const |
| { |
| return readInt32() != 0; |
| } |
| |
| status_t Parcel::readChar(char16_t *pArg) const |
| { |
| int32_t tmp = 0; |
| status_t ret = readInt32(&tmp); |
| *pArg = char16_t(tmp); |
| return ret; |
| } |
| |
| char16_t Parcel::readChar() const |
| { |
| return char16_t(readInt32()); |
| } |
| |
| status_t Parcel::readByte(int8_t *pArg) const |
| { |
| int32_t tmp = 0; |
| status_t ret = readInt32(&tmp); |
| *pArg = int8_t(tmp); |
| return ret; |
| } |
| |
| int8_t Parcel::readByte() const |
| { |
| return int8_t(readInt32()); |
| } |
| |
| status_t Parcel::readUtf8FromUtf16(std::string* str) const { |
| size_t utf16Size = 0; |
| const char16_t* src = readString16Inplace(&utf16Size); |
| if (!src) { |
| return UNEXPECTED_NULL; |
| } |
| |
| // Save ourselves the trouble, we're done. |
| if (utf16Size == 0u) { |
| str->clear(); |
| return NO_ERROR; |
| } |
| |
| // Allow for closing '\0' |
| ssize_t utf8Size = utf16_to_utf8_length(src, utf16Size) + 1; |
| if (utf8Size < 1) { |
| return BAD_VALUE; |
| } |
| // Note that while it is probably safe to assume string::resize keeps a |
| // spare byte around for the trailing null, we still pass the size including the trailing null |
| str->resize(utf8Size); |
| utf16_to_utf8(src, utf16Size, &((*str)[0]), utf8Size); |
| str->resize(utf8Size - 1); |
| return NO_ERROR; |
| } |
| |
| const char* Parcel::readCString() const |
| { |
| if (mDataPos < mDataSize) { |
| const size_t avail = mDataSize-mDataPos; |
| const char* str = reinterpret_cast<const char*>(mData+mDataPos); |
| // is the string's trailing NUL within the parcel's valid bounds? |
| const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); |
| if (eos) { |
| const size_t len = eos - str; |
| mDataPos += pad_size(len+1); |
| ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos); |
| return str; |
| } |
| } |
| return nullptr; |
| } |
| |
| String8 Parcel::readString8() const |
| { |
| size_t len; |
| const char* str = readString8Inplace(&len); |
| if (str) return String8(str, len); |
| ALOGE("Reading a NULL string not supported here."); |
| return String8(); |
| } |
| |
| status_t Parcel::readString8(String8* pArg) const |
| { |
| size_t len; |
| const char* str = readString8Inplace(&len); |
| if (str) { |
| pArg->setTo(str, len); |
| return 0; |
| } else { |
| *pArg = String8(); |
| return UNEXPECTED_NULL; |
| } |
| } |
| |
| const char* Parcel::readString8Inplace(size_t* outLen) const |
| { |
| int32_t size = readInt32(); |
| // watch for potential int overflow from size+1 |
| if (size >= 0 && size < INT32_MAX) { |
| *outLen = size; |
| const char* str = (const char*)readInplace(size+1); |
| if (str != nullptr) { |
| if (str[size] == '\0') { |
| return str; |
| } |
| android_errorWriteLog(0x534e4554, "172655291"); |
| } |
| } |
| *outLen = 0; |
| return nullptr; |
| } |
| |
| String16 Parcel::readString16() const |
| { |
| size_t len; |
| const char16_t* str = readString16Inplace(&len); |
| if (str) return String16(str, len); |
| ALOGE("Reading a NULL string not supported here."); |
| return String16(); |
| } |
| |
| |
| status_t Parcel::readString16(String16* pArg) const |
| { |
| size_t len; |
| const char16_t* str = readString16Inplace(&len); |
| if (str) { |
| pArg->setTo(str, len); |
| return 0; |
| } else { |
| *pArg = String16(); |
| return UNEXPECTED_NULL; |
| } |
| } |
| |
| const char16_t* Parcel::readString16Inplace(size_t* outLen) const |
| { |
| int32_t size = readInt32(); |
| // watch for potential int overflow from size+1 |
| if (size >= 0 && size < INT32_MAX) { |
| *outLen = size; |
| const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); |
| if (str != nullptr) { |
| if (str[size] == u'\0') { |
| return str; |
| } |
| android_errorWriteLog(0x534e4554, "172655291"); |
| } |
| } |
| *outLen = 0; |
| return nullptr; |
| } |
| |
| status_t Parcel::readStrongBinder(sp<IBinder>* val) const |
| { |
| status_t status = readNullableStrongBinder(val); |
| if (status == OK && !val->get()) { |
| status = UNEXPECTED_NULL; |
| } |
| return status; |
| } |
| |
| status_t Parcel::readNullableStrongBinder(sp<IBinder>* val) const |
| { |
| return unflattenBinder(val); |
| } |
| |
| sp<IBinder> Parcel::readStrongBinder() const |
| { |
| sp<IBinder> val; |
| // Note that a lot of code in Android reads binders by hand with this |
| // method, and that code has historically been ok with getting nullptr |
| // back (while ignoring error codes). |
| readNullableStrongBinder(&val); |
| return val; |
| } |
| |
| int32_t Parcel::readExceptionCode() const |
| { |
| binder::Status status; |
| status.readFromParcel(*this); |
| return status.exceptionCode(); |
| } |
| |
| native_handle* Parcel::readNativeHandle() const |
| { |
| int numFds, numInts; |
| status_t err; |
| err = readInt32(&numFds); |
| if (err != NO_ERROR) return nullptr; |
| err = readInt32(&numInts); |
| if (err != NO_ERROR) return nullptr; |
| |
| native_handle* h = native_handle_create(numFds, numInts); |
| if (!h) { |
| return nullptr; |
| } |
| |
| for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { |
| h->data[i] = fcntl(readFileDescriptor(), F_DUPFD_CLOEXEC, 0); |
| if (h->data[i] < 0) { |
| for (int j = 0; j < i; j++) { |
| close(h->data[j]); |
| } |
| native_handle_delete(h); |
| return nullptr; |
| } |
| } |
| err = read(h->data + numFds, sizeof(int)*numInts); |
| if (err != NO_ERROR) { |
| native_handle_close(h); |
| native_handle_delete(h); |
| h = nullptr; |
| } |
| return h; |
| } |
| |
| int Parcel::readFileDescriptor() const |
| { |
| const flat_binder_object* flat = readObject(true); |
| |
| if (flat && flat->hdr.type == BINDER_TYPE_FD) { |
| return flat->handle; |
| } |
| |
| return BAD_TYPE; |
| } |
| |
| int Parcel::readParcelFileDescriptor() const |
| { |
| int32_t hasComm = readInt32(); |
| int fd = readFileDescriptor(); |
| if (hasComm != 0) { |
| // detach (owned by the binder driver) |
| int comm = readFileDescriptor(); |
| |
| // warning: this must be kept in sync with: |
| // frameworks/base/core/java/android/os/ParcelFileDescriptor.java |
| enum ParcelFileDescriptorStatus { |
| DETACHED = 2, |
| }; |
| |
| #if BYTE_ORDER == BIG_ENDIAN |
| const int32_t message = ParcelFileDescriptorStatus::DETACHED; |
| #endif |
| #if BYTE_ORDER == LITTLE_ENDIAN |
| const int32_t message = __builtin_bswap32(ParcelFileDescriptorStatus::DETACHED); |
| #endif |
| |
| ssize_t written = TEMP_FAILURE_RETRY( |
| ::write(comm, &message, sizeof(message))); |
| |
| if (written != sizeof(message)) { |
| ALOGW("Failed to detach ParcelFileDescriptor written: %zd err: %s", |
| written, strerror(errno)); |
| return BAD_TYPE; |
| } |
| } |
| return fd; |
| } |
| |
| status_t Parcel::readUniqueFileDescriptor(base::unique_fd* val) const |
| { |
| int got = readFileDescriptor(); |
| |
| if (got == BAD_TYPE) { |
| return BAD_TYPE; |
| } |
| |
| val->reset(fcntl(got, F_DUPFD_CLOEXEC, 0)); |
| |
| if (val->get() < 0) { |
| return BAD_VALUE; |
| } |
| |
| return OK; |
| } |
| |
| status_t Parcel::readUniqueParcelFileDescriptor(base::unique_fd* val) const |
| { |
| int got = readParcelFileDescriptor(); |
| |
| if (got == BAD_TYPE) { |
| return BAD_TYPE; |
| } |
| |
| val->reset(fcntl(got, F_DUPFD_CLOEXEC, 0)); |
| |
| if (val->get() < 0) { |
| return BAD_VALUE; |
| } |
| |
| return OK; |
| } |
| |
| status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const |
| { |
| int32_t blobType; |
| status_t status = readInt32(&blobType); |
| if (status) return status; |
| |
| if (blobType == BLOB_INPLACE) { |
| ALOGV("readBlob: read in place"); |
| const void* ptr = readInplace(len); |
| if (!ptr) return BAD_VALUE; |
| |
| outBlob->init(-1, const_cast<void*>(ptr), len, false); |
| return NO_ERROR; |
| } |
| |
| ALOGV("readBlob: read from ashmem"); |
| bool isMutable = (blobType == BLOB_ASHMEM_MUTABLE); |
| int fd = readFileDescriptor(); |
| if (fd == int(BAD_TYPE)) return BAD_VALUE; |
| |
| if (!ashmem_valid(fd)) { |
| ALOGE("invalid fd"); |
| return BAD_VALUE; |
| } |
| int size = ashmem_get_size_region(fd); |
| if (size < 0 || size_t(size) < len) { |
| ALOGE("request size %zu does not match fd size %d", len, size); |
| return BAD_VALUE; |
| } |
| void* ptr = ::mmap(nullptr, len, isMutable ? PROT_READ | PROT_WRITE : PROT_READ, |
| MAP_SHARED, fd, 0); |
| if (ptr == MAP_FAILED) return NO_MEMORY; |
| |
| outBlob->init(fd, ptr, len, isMutable); |
| return NO_ERROR; |
| } |
| |
| status_t Parcel::read(FlattenableHelperInterface& val) const |
| { |
| // size |
| const size_t len = this->readInt32(); |
| const size_t fd_count = this->readInt32(); |
| |
| if ((len > INT32_MAX) || (fd_count >= gMaxFds)) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| // payload |
| void const* const buf = this->readInplace(pad_size(len)); |
| if (buf == nullptr) |
| return BAD_VALUE; |
| |
| int* fds = nullptr; |
| if (fd_count) { |
| fds = new (std::nothrow) int[fd_count]; |
| if (fds == nullptr) { |
| ALOGE("read: failed to allocate requested %zu fds", fd_count); |
| return BAD_VALUE; |
| } |
| } |
| |
| status_t err = NO_ERROR; |
| for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { |
| int fd = this->readFileDescriptor(); |
| if (fd < 0 || ((fds[i] = fcntl(fd, F_DUPFD_CLOEXEC, 0)) < 0)) { |
| err = BAD_VALUE; |
| ALOGE("fcntl(F_DUPFD_CLOEXEC) failed in Parcel::read, i is %zu, fds[i] is %d, fd_count is %zu, error: %s", |
| i, fds[i], fd_count, strerror(fd < 0 ? -fd : errno)); |
| // Close all the file descriptors that were dup-ed. |
| for (size_t j=0; j<i ;j++) { |
| close(fds[j]); |
| } |
| } |
| } |
| |
| if (err == NO_ERROR) { |
| err = val.unflatten(buf, len, fds, fd_count); |
| } |
| |
| if (fd_count) { |
| delete [] fds; |
| } |
| |
| return err; |
| } |
| const flat_binder_object* Parcel::readObject(bool nullMetaData) const |
| { |
| const size_t DPOS = mDataPos; |
| if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { |
| const flat_binder_object* obj |
| = reinterpret_cast<const flat_binder_object*>(mData+DPOS); |
| mDataPos = DPOS + sizeof(flat_binder_object); |
| if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) { |
| // When transferring a NULL object, we don't write it into |
| // the object list, so we don't want to check for it when |
| // reading. |
| ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); |
| return obj; |
| } |
| |
| // Ensure that this object is valid... |
| binder_size_t* const OBJS = mObjects; |
| const size_t N = mObjectsSize; |
| size_t opos = mNextObjectHint; |
| |
| if (N > 0) { |
| ALOGV("Parcel %p looking for obj at %zu, hint=%zu", |
| this, DPOS, opos); |
| |
| // Start at the current hint position, looking for an object at |
| // the current data position. |
| if (opos < N) { |
| while (opos < (N-1) && OBJS[opos] < DPOS) { |
| opos++; |
| } |
| } else { |
| opos = N-1; |
| } |
| if (OBJS[opos] == DPOS) { |
| // Found it! |
| ALOGV("Parcel %p found obj %zu at index %zu with forward search", |
| this, DPOS, opos); |
| mNextObjectHint = opos+1; |
| ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); |
| return obj; |
| } |
| |
| // Look backwards for it... |
| while (opos > 0 && OBJS[opos] > DPOS) { |
| opos--; |
| } |
| if (OBJS[opos] == DPOS) { |
| // Found it! |
| ALOGV("Parcel %p found obj %zu at index %zu with backward search", |
| this, DPOS, opos); |
| mNextObjectHint = opos+1; |
| ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); |
| return obj; |
| } |
| } |
| ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list", |
| this, DPOS); |
| } |
| return nullptr; |
| } |
| |
| void Parcel::closeFileDescriptors() |
| { |
| size_t i = mObjectsSize; |
| if (i > 0) { |
| //ALOGI("Closing file descriptors for %zu objects...", i); |
| } |
| while (i > 0) { |
| i--; |
| const flat_binder_object* flat |
| = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); |
| if (flat->hdr.type == BINDER_TYPE_FD) { |
| //ALOGI("Closing fd: %ld", flat->handle); |
| close(flat->handle); |
| } |
| } |
| } |
| |
| uintptr_t Parcel::ipcData() const |
| { |
| return reinterpret_cast<uintptr_t>(mData); |
| } |
| |
| size_t Parcel::ipcDataSize() const |
| { |
| return (mDataSize > mDataPos ? mDataSize : mDataPos); |
| } |
| |
| uintptr_t Parcel::ipcObjects() const |
| { |
| return reinterpret_cast<uintptr_t>(mObjects); |
| } |
| |
| size_t Parcel::ipcObjectsCount() const |
| { |
| return mObjectsSize; |
| } |
| |
| void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, |
| const binder_size_t* objects, size_t objectsCount, release_func relFunc) |
| { |
| // this code uses 'mOwner == nullptr' to understand whether it owns memory |
| LOG_ALWAYS_FATAL_IF(relFunc == nullptr, "must provide cleanup function"); |
| |
| freeData(); |
| |
| mData = const_cast<uint8_t*>(data); |
| mDataSize = mDataCapacity = dataSize; |
| mObjects = const_cast<binder_size_t*>(objects); |
| mObjectsSize = mObjectsCapacity = objectsCount; |
| mOwner = relFunc; |
| |
| binder_size_t minOffset = 0; |
| for (size_t i = 0; i < mObjectsSize; i++) { |
| binder_size_t offset = mObjects[i]; |
| if (offset < minOffset) { |
| ALOGE("%s: bad object offset %" PRIu64 " < %" PRIu64 "\n", |
| __func__, (uint64_t)offset, (uint64_t)minOffset); |
| mObjectsSize = 0; |
| break; |
| } |
| const flat_binder_object* flat |
| = reinterpret_cast<const flat_binder_object*>(mData + offset); |
| uint32_t type = flat->hdr.type; |
| if (!(type == BINDER_TYPE_BINDER || type == BINDER_TYPE_HANDLE || |
| type == BINDER_TYPE_FD)) { |
| // We should never receive other types (eg BINDER_TYPE_FDA) as long as we don't support |
| // them in libbinder. If we do receive them, it probably means a kernel bug; try to |
| // recover gracefully by clearing out the objects, and releasing the objects we do |
| // know about. |
| android_errorWriteLog(0x534e4554, "135930648"); |
| ALOGE("%s: unsupported type object (%" PRIu32 ") at offset %" PRIu64 "\n", |
| __func__, type, (uint64_t)offset); |
| releaseObjects(); |
| mObjectsSize = 0; |
| break; |
| } |
| minOffset = offset + sizeof(flat_binder_object); |
| } |
| scanForFds(); |
| } |
| |
| void Parcel::print(TextOutput& to, uint32_t /*flags*/) const |
| { |
| to << "Parcel("; |
| |
| if (errorCheck() != NO_ERROR) { |
| const status_t err = errorCheck(); |
| to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\""; |
| } else if (dataSize() > 0) { |
| const uint8_t* DATA = data(); |
| to << indent << HexDump(DATA, dataSize()) << dedent; |
| const binder_size_t* OBJS = mObjects; |
| const size_t N = objectsCount(); |
| for (size_t i=0; i<N; i++) { |
| const flat_binder_object* flat |
| = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); |
| to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " |
| << TypeCode(flat->hdr.type & 0x7f7f7f00) |
| << " = " << flat->binder; |
| } |
| } else { |
| to << "NULL"; |
| } |
| |
| to << ")"; |
| } |
| |
| void Parcel::releaseObjects() |
| { |
| size_t i = mObjectsSize; |
| if (i == 0) { |
| return; |
| } |
| sp<ProcessState> proc(ProcessState::self()); |
| uint8_t* const data = mData; |
| binder_size_t* const objects = mObjects; |
| while (i > 0) { |
| i--; |
| const flat_binder_object* flat |
| = reinterpret_cast<flat_binder_object*>(data+objects[i]); |
| release_object(proc, *flat, this, &mOpenAshmemSize); |
| } |
| } |
| |
| void Parcel::acquireObjects() |
| { |
| size_t i = mObjectsSize; |
| if (i == 0) { |
| return; |
| } |
| const sp<ProcessState> proc(ProcessState::self()); |
| uint8_t* const data = mData; |
| binder_size_t* const objects = mObjects; |
| while (i > 0) { |
| i--; |
| const flat_binder_object* flat |
| = reinterpret_cast<flat_binder_object*>(data+objects[i]); |
| acquire_object(proc, *flat, this, &mOpenAshmemSize); |
| } |
| } |
| |
| void Parcel::freeData() |
| { |
| freeDataNoInit(); |
| initState(); |
| } |
| |
| void Parcel::freeDataNoInit() |
| { |
| if (mOwner) { |
| LOG_ALLOC("Parcel %p: freeing other owner data", this); |
| //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); |
| mOwner(this, mData, mDataSize, mObjects, mObjectsSize); |
| } else { |
| LOG_ALLOC("Parcel %p: freeing allocated data", this); |
| releaseObjects(); |
| if (mData) { |
| LOG_ALLOC("Parcel %p: freeing with %zu capacity", this, mDataCapacity); |
| gParcelGlobalAllocSize -= mDataCapacity; |
| gParcelGlobalAllocCount--; |
| if (mDeallocZero) { |
| zeroMemory(mData, mDataSize); |
| } |
| free(mData); |
| } |
| if (mObjects) free(mObjects); |
| } |
| } |
| |
| status_t Parcel::growData(size_t len) |
| { |
| if (len > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| if (len > SIZE_MAX - mDataSize) return NO_MEMORY; // overflow |
| if (mDataSize + len > SIZE_MAX / 3) return NO_MEMORY; // overflow |
| size_t newSize = ((mDataSize+len)*3)/2; |
| return (newSize <= mDataSize) |
| ? (status_t) NO_MEMORY |
| : continueWrite(std::max(newSize, (size_t) 128)); |
| } |
| |
| static uint8_t* reallocZeroFree(uint8_t* data, size_t oldCapacity, size_t newCapacity, bool zero) { |
| if (!zero) { |
| return (uint8_t*)realloc(data, newCapacity); |
| } |
| uint8_t* newData = (uint8_t*)malloc(newCapacity); |
| if (!newData) { |
| return nullptr; |
| } |
| |
| memcpy(newData, data, std::min(oldCapacity, newCapacity)); |
| zeroMemory(data, oldCapacity); |
| free(data); |
| return newData; |
| } |
| |
| status_t Parcel::restartWrite(size_t desired) |
| { |
| if (desired > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| if (mOwner) { |
| freeData(); |
| return continueWrite(desired); |
| } |
| |
| uint8_t* data = reallocZeroFree(mData, mDataCapacity, desired, mDeallocZero); |
| if (!data && desired > mDataCapacity) { |
| mError = NO_MEMORY; |
| return NO_MEMORY; |
| } |
| |
| releaseObjects(); |
| |
| if (data || desired == 0) { |
| LOG_ALLOC("Parcel %p: restart from %zu to %zu capacity", this, mDataCapacity, desired); |
| if (mDataCapacity > desired) { |
| gParcelGlobalAllocSize -= (mDataCapacity - desired); |
| } else { |
| gParcelGlobalAllocSize += (desired - mDataCapacity); |
| } |
| |
| if (!mData) { |
| gParcelGlobalAllocCount++; |
| } |
| mData = data; |
| mDataCapacity = desired; |
| } |
| |
| mDataSize = mDataPos = 0; |
| ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize); |
| ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos); |
| |
| free(mObjects); |
| mObjects = nullptr; |
| mObjectsSize = mObjectsCapacity = 0; |
| mNextObjectHint = 0; |
| mObjectsSorted = false; |
| mHasFds = false; |
| mFdsKnown = true; |
| mAllowFds = true; |
| |
| return NO_ERROR; |
| } |
| |
| status_t Parcel::continueWrite(size_t desired) |
| { |
| if (desired > INT32_MAX) { |
| // don't accept size_t values which may have come from an |
| // inadvertent conversion from a negative int. |
| return BAD_VALUE; |
| } |
| |
| // If shrinking, first adjust for any objects that appear |
| // after the new data size. |
| size_t objectsSize = mObjectsSize; |
| if (desired < mDataSize) { |
| if (desired == 0) { |
| objectsSize = 0; |
| } else { |
| while (objectsSize > 0) { |
| if (mObjects[objectsSize-1] < desired) |
| break; |
| objectsSize--; |
| } |
| } |
| } |
| |
| if (mOwner) { |
| // If the size is going to zero, just release the owner's data. |
| if (desired == 0) { |
| freeData(); |
| return NO_ERROR; |
| } |
| |
| // If there is a different owner, we need to take |
| // posession. |
| uint8_t* data = (uint8_t*)malloc(desired); |
| if (!data) { |
| mError = NO_MEMORY; |
| return NO_MEMORY; |
| } |
| binder_size_t* objects = nullptr; |
| |
| if (objectsSize) { |
| objects = (binder_size_t*)calloc(objectsSize, sizeof(binder_size_t)); |
| if (!objects) { |
| free(data); |
| |
| mError = NO_MEMORY; |
| return NO_MEMORY; |
| } |
| |
| // Little hack to only acquire references on objects |
| // we will be keeping. |
| size_t oldObjectsSize = mObjectsSize; |
| mObjectsSize = objectsSize; |
| acquireObjects(); |
| mObjectsSize = oldObjectsSize; |
| } |
| |
| if (mData) { |
| memcpy(data, mData, mDataSize < desired ? mDataSize : desired); |
| } |
| if (objects && mObjects) { |
| memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t)); |
| } |
| //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); |
| mOwner(this, mData, mDataSize, mObjects, mObjectsSize); |
| mOwner = nullptr; |
| |
| LOG_ALLOC("Parcel %p: taking ownership of %zu capacity", this, desired); |
| gParcelGlobalAllocSize += desired; |
| gParcelGlobalAllocCount++; |
| |
| mData = data; |
| mObjects = objects; |
| mDataSize = (mDataSize < desired) ? mDataSize : desired; |
| ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); |
| mDataCapacity = desired; |
| mObjectsSize = mObjectsCapacity = objectsSize; |
| mNextObjectHint = 0; |
| mObjectsSorted = false; |
| |
| } else if (mData) { |
| if (objectsSize < mObjectsSize) { |
| // Need to release refs on any objects we are dropping. |
| const sp<ProcessState> proc(ProcessState::self()); |
| for (size_t i=objectsSize; i<mObjectsSize; i++) { |
| const flat_binder_object* flat |
| = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); |
| if (flat->hdr.type == BINDER_TYPE_FD) { |
| // will need to rescan because we may have lopped off the only FDs |
| mFdsKnown = false; |
| } |
| release_object(proc, *flat, this, &mOpenAshmemSize); |
| } |
| |
| if (objectsSize == 0) { |
| free(mObjects); |
| mObjects = nullptr; |
| mObjectsCapacity = 0; |
| } else { |
| binder_size_t* objects = |
| (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t)); |
| if (objects) { |
| mObjects = objects; |
| mObjectsCapacity = objectsSize; |
| } |
| } |
| mObjectsSize = objectsSize; |
| mNextObjectHint = 0; |
| mObjectsSorted = false; |
| } |
| |
| // We own the data, so we can just do a realloc(). |
| if (desired > mDataCapacity) { |
| uint8_t* data = reallocZeroFree(mData, mDataCapacity, desired, mDeallocZero); |
| if (data) { |
| LOG_ALLOC("Parcel %p: continue from %zu to %zu capacity", this, mDataCapacity, |
| desired); |
| gParcelGlobalAllocSize += desired; |
| gParcelGlobalAllocSize -= mDataCapacity; |
| mData = data; |
| mDataCapacity = desired; |
| } else { |
| mError = NO_MEMORY; |
| return NO_MEMORY; |
| } |
| } else { |
| if (mDataSize > desired) { |
| mDataSize = desired; |
| ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); |
| } |
| if (mDataPos > desired) { |
| mDataPos = desired; |
| ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); |
| } |
| } |
| |
| } else { |
| // This is the first data. Easy! |
| uint8_t* data = (uint8_t*)malloc(desired); |
| if (!data) { |
| mError = NO_MEMORY; |
| return NO_MEMORY; |
| } |
| |
| if(!(mDataCapacity == 0 && mObjects == nullptr |
| && mObjectsCapacity == 0)) { |
| ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired); |
| } |
| |
| LOG_ALLOC("Parcel %p: allocating with %zu capacity", this, desired); |
| gParcelGlobalAllocSize += desired; |
| gParcelGlobalAllocCount++; |
| |
| mData = data; |
| mDataSize = mDataPos = 0; |
| ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); |
| ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); |
| mDataCapacity = desired; |
| } |
| |
| return NO_ERROR; |
| } |
| |
| void Parcel::initState() |
| { |
| LOG_ALLOC("Parcel %p: initState", this); |
| mError = NO_ERROR; |
| mData = nullptr; |
| mDataSize = 0; |
| mDataCapacity = 0; |
| mDataPos = 0; |
| ALOGV("initState Setting data size of %p to %zu", this, mDataSize); |
| ALOGV("initState Setting data pos of %p to %zu", this, mDataPos); |
| mSession = nullptr; |
| mObjects = nullptr; |
| mObjectsSize = 0; |
| mObjectsCapacity = 0; |
| mNextObjectHint = 0; |
| mObjectsSorted = false; |
| mHasFds = false; |
| mFdsKnown = true; |
| mAllowFds = true; |
| mDeallocZero = false; |
| mOwner = nullptr; |
| mOpenAshmemSize = 0; |
| mWorkSourceRequestHeaderPosition = 0; |
| mRequestHeaderPresent = false; |
| |
| // racing multiple init leads only to multiple identical write |
| if (gMaxFds == 0) { |
| struct rlimit result; |
| if (!getrlimit(RLIMIT_NOFILE, &result)) { |
| gMaxFds = (size_t)result.rlim_cur; |
| //ALOGI("parcel fd limit set to %zu", gMaxFds); |
| } else { |
| ALOGW("Unable to getrlimit: %s", strerror(errno)); |
| gMaxFds = 1024; |
| } |
| } |
| } |
| |
| void Parcel::scanForFds() const |
| { |
| bool hasFds = false; |
| for (size_t i=0; i<mObjectsSize; i++) { |
| const flat_binder_object* flat |
| = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); |
| if (flat->hdr.type == BINDER_TYPE_FD) { |
| hasFds = true; |
| break; |
| } |
| } |
| mHasFds = hasFds; |
| mFdsKnown = true; |
| } |
| |
| size_t Parcel::getBlobAshmemSize() const |
| { |
| // This used to return the size of all blobs that were written to ashmem, now we're returning |
| // the ashmem currently referenced by this Parcel, which should be equivalent. |
| // TODO: Remove method once ABI can be changed. |
| return mOpenAshmemSize; |
| } |
| |
| size_t Parcel::getOpenAshmemSize() const |
| { |
| return mOpenAshmemSize; |
| } |
| |
| // --- Parcel::Blob --- |
| |
| Parcel::Blob::Blob() : |
| mFd(-1), mData(nullptr), mSize(0), mMutable(false) { |
| } |
| |
| Parcel::Blob::~Blob() { |
| release(); |
| } |
| |
| void Parcel::Blob::release() { |
| if (mFd != -1 && mData) { |
| ::munmap(mData, mSize); |
| } |
| clear(); |
| } |
| |
| void Parcel::Blob::init(int fd, void* data, size_t size, bool isMutable) { |
| mFd = fd; |
| mData = data; |
| mSize = size; |
| mMutable = isMutable; |
| } |
| |
| void Parcel::Blob::clear() { |
| mFd = -1; |
| mData = nullptr; |
| mSize = 0; |
| mMutable = false; |
| } |
| |
| } // namespace android |