Parcel.cpp revision d6848f52e60be17b7f0992be7827dcae4ea2efb1
1/* 2 * Copyright (C) 2005 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define LOG_TAG "Parcel" 18//#define LOG_NDEBUG 0 19 20#include <binder/Parcel.h> 21 22#include <binder/IPCThreadState.h> 23#include <binder/Binder.h> 24#include <binder/BpBinder.h> 25#include <binder/ProcessState.h> 26#include <binder/TextOutput.h> 27 28#include <errno.h> 29#include <utils/Debug.h> 30#include <utils/Log.h> 31#include <utils/String8.h> 32#include <utils/String16.h> 33#include <utils/misc.h> 34#include <utils/Flattenable.h> 35#include <cutils/ashmem.h> 36 37#include <private/binder/binder_module.h> 38#include <private/binder/Static.h> 39 40#include <inttypes.h> 41#include <stdio.h> 42#include <stdlib.h> 43#include <stdint.h> 44#include <sys/mman.h> 45 46#ifndef INT32_MAX 47#define INT32_MAX ((int32_t)(2147483647)) 48#endif 49 50#define LOG_REFS(...) 51//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 52#define LOG_ALLOC(...) 53//#define LOG_ALLOC(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 54 55// --------------------------------------------------------------------------- 56 57// This macro should never be used at runtime, as a too large value 58// of s could cause an integer overflow. Instead, you should always 59// use the wrapper function pad_size() 60#define PAD_SIZE_UNSAFE(s) (((s)+3)&~3) 61 62static size_t pad_size(size_t s) { 63 if (s > (SIZE_T_MAX - 3)) { 64 abort(); 65 } 66 return PAD_SIZE_UNSAFE(s); 67} 68 69// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 70#define STRICT_MODE_PENALTY_GATHER (0x40 << 16) 71 72// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER 73#define EX_HAS_REPLY_HEADER -128 74 75// XXX This can be made public if we want to provide 76// support for typed data. 77struct small_flat_data 78{ 79 uint32_t type; 80 uint32_t data; 81}; 82 83namespace android { 84 85static pthread_mutex_t gParcelGlobalAllocSizeLock = PTHREAD_MUTEX_INITIALIZER; 86static size_t gParcelGlobalAllocSize = 0; 87static size_t gParcelGlobalAllocCount = 0; 88 89// Maximum size of a blob to transfer in-place. 90static const size_t BLOB_INPLACE_LIMIT = 16 * 1024; 91 92enum { 93 BLOB_INPLACE = 0, 94 BLOB_ASHMEM_IMMUTABLE = 1, 95 BLOB_ASHMEM_MUTABLE = 2, 96}; 97 98void acquire_object(const sp<ProcessState>& proc, 99 const flat_binder_object& obj, const void* who) 100{ 101 switch (obj.type) { 102 case BINDER_TYPE_BINDER: 103 if (obj.binder) { 104 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 105 reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who); 106 } 107 return; 108 case BINDER_TYPE_WEAK_BINDER: 109 if (obj.binder) 110 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 111 return; 112 case BINDER_TYPE_HANDLE: { 113 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 114 if (b != NULL) { 115 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 116 b->incStrong(who); 117 } 118 return; 119 } 120 case BINDER_TYPE_WEAK_HANDLE: { 121 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 122 if (b != NULL) b.get_refs()->incWeak(who); 123 return; 124 } 125 case BINDER_TYPE_FD: { 126 // intentionally blank -- nothing to do to acquire this, but we do 127 // recognize it as a legitimate object type. 128 return; 129 } 130 } 131 132 ALOGD("Invalid object type 0x%08x", obj.type); 133} 134 135void release_object(const sp<ProcessState>& proc, 136 const flat_binder_object& obj, const void* who) 137{ 138 switch (obj.type) { 139 case BINDER_TYPE_BINDER: 140 if (obj.binder) { 141 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 142 reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who); 143 } 144 return; 145 case BINDER_TYPE_WEAK_BINDER: 146 if (obj.binder) 147 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 148 return; 149 case BINDER_TYPE_HANDLE: { 150 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 151 if (b != NULL) { 152 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 153 b->decStrong(who); 154 } 155 return; 156 } 157 case BINDER_TYPE_WEAK_HANDLE: { 158 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 159 if (b != NULL) b.get_refs()->decWeak(who); 160 return; 161 } 162 case BINDER_TYPE_FD: { 163 if (obj.cookie != 0) close(obj.handle); 164 return; 165 } 166 } 167 168 ALOGE("Invalid object type 0x%08x", obj.type); 169} 170 171inline static status_t finish_flatten_binder( 172 const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out) 173{ 174 return out->writeObject(flat, false); 175} 176 177status_t flatten_binder(const sp<ProcessState>& /*proc*/, 178 const sp<IBinder>& binder, Parcel* out) 179{ 180 flat_binder_object obj; 181 182 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 183 if (binder != NULL) { 184 IBinder *local = binder->localBinder(); 185 if (!local) { 186 BpBinder *proxy = binder->remoteBinder(); 187 if (proxy == NULL) { 188 ALOGE("null proxy"); 189 } 190 const int32_t handle = proxy ? proxy->handle() : 0; 191 obj.type = BINDER_TYPE_HANDLE; 192 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 193 obj.handle = handle; 194 obj.cookie = 0; 195 } else { 196 obj.type = BINDER_TYPE_BINDER; 197 obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs()); 198 obj.cookie = reinterpret_cast<uintptr_t>(local); 199 } 200 } else { 201 obj.type = BINDER_TYPE_BINDER; 202 obj.binder = 0; 203 obj.cookie = 0; 204 } 205 206 return finish_flatten_binder(binder, obj, out); 207} 208 209status_t flatten_binder(const sp<ProcessState>& /*proc*/, 210 const wp<IBinder>& binder, Parcel* out) 211{ 212 flat_binder_object obj; 213 214 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 215 if (binder != NULL) { 216 sp<IBinder> real = binder.promote(); 217 if (real != NULL) { 218 IBinder *local = real->localBinder(); 219 if (!local) { 220 BpBinder *proxy = real->remoteBinder(); 221 if (proxy == NULL) { 222 ALOGE("null proxy"); 223 } 224 const int32_t handle = proxy ? proxy->handle() : 0; 225 obj.type = BINDER_TYPE_WEAK_HANDLE; 226 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 227 obj.handle = handle; 228 obj.cookie = 0; 229 } else { 230 obj.type = BINDER_TYPE_WEAK_BINDER; 231 obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs()); 232 obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get()); 233 } 234 return finish_flatten_binder(real, obj, out); 235 } 236 237 // XXX How to deal? In order to flatten the given binder, 238 // we need to probe it for information, which requires a primary 239 // reference... but we don't have one. 240 // 241 // The OpenBinder implementation uses a dynamic_cast<> here, 242 // but we can't do that with the different reference counting 243 // implementation we are using. 244 ALOGE("Unable to unflatten Binder weak reference!"); 245 obj.type = BINDER_TYPE_BINDER; 246 obj.binder = 0; 247 obj.cookie = 0; 248 return finish_flatten_binder(NULL, obj, out); 249 250 } else { 251 obj.type = BINDER_TYPE_BINDER; 252 obj.binder = 0; 253 obj.cookie = 0; 254 return finish_flatten_binder(NULL, obj, out); 255 } 256} 257 258inline static status_t finish_unflatten_binder( 259 BpBinder* /*proxy*/, const flat_binder_object& /*flat*/, 260 const Parcel& /*in*/) 261{ 262 return NO_ERROR; 263} 264 265status_t unflatten_binder(const sp<ProcessState>& proc, 266 const Parcel& in, sp<IBinder>* out) 267{ 268 const flat_binder_object* flat = in.readObject(false); 269 270 if (flat) { 271 switch (flat->type) { 272 case BINDER_TYPE_BINDER: 273 *out = reinterpret_cast<IBinder*>(flat->cookie); 274 return finish_unflatten_binder(NULL, *flat, in); 275 case BINDER_TYPE_HANDLE: 276 *out = proc->getStrongProxyForHandle(flat->handle); 277 return finish_unflatten_binder( 278 static_cast<BpBinder*>(out->get()), *flat, in); 279 } 280 } 281 return BAD_TYPE; 282} 283 284status_t unflatten_binder(const sp<ProcessState>& proc, 285 const Parcel& in, wp<IBinder>* out) 286{ 287 const flat_binder_object* flat = in.readObject(false); 288 289 if (flat) { 290 switch (flat->type) { 291 case BINDER_TYPE_BINDER: 292 *out = reinterpret_cast<IBinder*>(flat->cookie); 293 return finish_unflatten_binder(NULL, *flat, in); 294 case BINDER_TYPE_WEAK_BINDER: 295 if (flat->binder != 0) { 296 out->set_object_and_refs( 297 reinterpret_cast<IBinder*>(flat->cookie), 298 reinterpret_cast<RefBase::weakref_type*>(flat->binder)); 299 } else { 300 *out = NULL; 301 } 302 return finish_unflatten_binder(NULL, *flat, in); 303 case BINDER_TYPE_HANDLE: 304 case BINDER_TYPE_WEAK_HANDLE: 305 *out = proc->getWeakProxyForHandle(flat->handle); 306 return finish_unflatten_binder( 307 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 308 } 309 } 310 return BAD_TYPE; 311} 312 313// --------------------------------------------------------------------------- 314 315Parcel::Parcel() 316{ 317 LOG_ALLOC("Parcel %p: constructing", this); 318 initState(); 319} 320 321Parcel::~Parcel() 322{ 323 freeDataNoInit(); 324 LOG_ALLOC("Parcel %p: destroyed", this); 325} 326 327size_t Parcel::getGlobalAllocSize() { 328 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 329 size_t size = gParcelGlobalAllocSize; 330 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 331 return size; 332} 333 334size_t Parcel::getGlobalAllocCount() { 335 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 336 size_t count = gParcelGlobalAllocCount; 337 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 338 return count; 339} 340 341const uint8_t* Parcel::data() const 342{ 343 return mData; 344} 345 346size_t Parcel::dataSize() const 347{ 348 return (mDataSize > mDataPos ? mDataSize : mDataPos); 349} 350 351size_t Parcel::dataAvail() const 352{ 353 // TODO: decide what to do about the possibility that this can 354 // report an available-data size that exceeds a Java int's max 355 // positive value, causing havoc. Fortunately this will only 356 // happen if someone constructs a Parcel containing more than two 357 // gigabytes of data, which on typical phone hardware is simply 358 // not possible. 359 return dataSize() - dataPosition(); 360} 361 362size_t Parcel::dataPosition() const 363{ 364 return mDataPos; 365} 366 367size_t Parcel::dataCapacity() const 368{ 369 return mDataCapacity; 370} 371 372status_t Parcel::setDataSize(size_t size) 373{ 374 if (size > INT32_MAX) { 375 // don't accept size_t values which may have come from an 376 // inadvertent conversion from a negative int. 377 return BAD_VALUE; 378 } 379 380 status_t err; 381 err = continueWrite(size); 382 if (err == NO_ERROR) { 383 mDataSize = size; 384 ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize); 385 } 386 return err; 387} 388 389void Parcel::setDataPosition(size_t pos) const 390{ 391 if (pos > INT32_MAX) { 392 // don't accept size_t values which may have come from an 393 // inadvertent conversion from a negative int. 394 abort(); 395 } 396 397 mDataPos = pos; 398 mNextObjectHint = 0; 399} 400 401status_t Parcel::setDataCapacity(size_t size) 402{ 403 if (size > INT32_MAX) { 404 // don't accept size_t values which may have come from an 405 // inadvertent conversion from a negative int. 406 return BAD_VALUE; 407 } 408 409 if (size > mDataCapacity) return continueWrite(size); 410 return NO_ERROR; 411} 412 413status_t Parcel::setData(const uint8_t* buffer, size_t len) 414{ 415 if (len > INT32_MAX) { 416 // don't accept size_t values which may have come from an 417 // inadvertent conversion from a negative int. 418 return BAD_VALUE; 419 } 420 421 status_t err = restartWrite(len); 422 if (err == NO_ERROR) { 423 memcpy(const_cast<uint8_t*>(data()), buffer, len); 424 mDataSize = len; 425 mFdsKnown = false; 426 } 427 return err; 428} 429 430status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len) 431{ 432 const sp<ProcessState> proc(ProcessState::self()); 433 status_t err; 434 const uint8_t *data = parcel->mData; 435 const binder_size_t *objects = parcel->mObjects; 436 size_t size = parcel->mObjectsSize; 437 int startPos = mDataPos; 438 int firstIndex = -1, lastIndex = -2; 439 440 if (len == 0) { 441 return NO_ERROR; 442 } 443 444 if (len > INT32_MAX) { 445 // don't accept size_t values which may have come from an 446 // inadvertent conversion from a negative int. 447 return BAD_VALUE; 448 } 449 450 // range checks against the source parcel size 451 if ((offset > parcel->mDataSize) 452 || (len > parcel->mDataSize) 453 || (offset + len > parcel->mDataSize)) { 454 return BAD_VALUE; 455 } 456 457 // Count objects in range 458 for (int i = 0; i < (int) size; i++) { 459 size_t off = objects[i]; 460 if ((off >= offset) && (off + sizeof(flat_binder_object) <= offset + len)) { 461 if (firstIndex == -1) { 462 firstIndex = i; 463 } 464 lastIndex = i; 465 } 466 } 467 int numObjects = lastIndex - firstIndex + 1; 468 469 if ((mDataSize+len) > mDataCapacity) { 470 // grow data 471 err = growData(len); 472 if (err != NO_ERROR) { 473 return err; 474 } 475 } 476 477 // append data 478 memcpy(mData + mDataPos, data + offset, len); 479 mDataPos += len; 480 mDataSize += len; 481 482 err = NO_ERROR; 483 484 if (numObjects > 0) { 485 // grow objects 486 if (mObjectsCapacity < mObjectsSize + numObjects) { 487 size_t newSize = ((mObjectsSize + numObjects)*3)/2; 488 if (newSize < mObjectsSize) return NO_MEMORY; // overflow 489 binder_size_t *objects = 490 (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 491 if (objects == (binder_size_t*)0) { 492 return NO_MEMORY; 493 } 494 mObjects = objects; 495 mObjectsCapacity = newSize; 496 } 497 498 // append and acquire objects 499 int idx = mObjectsSize; 500 for (int i = firstIndex; i <= lastIndex; i++) { 501 size_t off = objects[i] - offset + startPos; 502 mObjects[idx++] = off; 503 mObjectsSize++; 504 505 flat_binder_object* flat 506 = reinterpret_cast<flat_binder_object*>(mData + off); 507 acquire_object(proc, *flat, this); 508 509 if (flat->type == BINDER_TYPE_FD) { 510 // If this is a file descriptor, we need to dup it so the 511 // new Parcel now owns its own fd, and can declare that we 512 // officially know we have fds. 513 flat->handle = dup(flat->handle); 514 flat->cookie = 1; 515 mHasFds = mFdsKnown = true; 516 if (!mAllowFds) { 517 err = FDS_NOT_ALLOWED; 518 } 519 } 520 } 521 } 522 523 return err; 524} 525 526bool Parcel::allowFds() const 527{ 528 return mAllowFds; 529} 530 531bool Parcel::pushAllowFds(bool allowFds) 532{ 533 const bool origValue = mAllowFds; 534 if (!allowFds) { 535 mAllowFds = false; 536 } 537 return origValue; 538} 539 540void Parcel::restoreAllowFds(bool lastValue) 541{ 542 mAllowFds = lastValue; 543} 544 545bool Parcel::hasFileDescriptors() const 546{ 547 if (!mFdsKnown) { 548 scanForFds(); 549 } 550 return mHasFds; 551} 552 553// Write RPC headers. (previously just the interface token) 554status_t Parcel::writeInterfaceToken(const String16& interface) 555{ 556 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 557 STRICT_MODE_PENALTY_GATHER); 558 // currently the interface identification token is just its name as a string 559 return writeString16(interface); 560} 561 562bool Parcel::checkInterface(IBinder* binder) const 563{ 564 return enforceInterface(binder->getInterfaceDescriptor()); 565} 566 567bool Parcel::enforceInterface(const String16& interface, 568 IPCThreadState* threadState) const 569{ 570 int32_t strictPolicy = readInt32(); 571 if (threadState == NULL) { 572 threadState = IPCThreadState::self(); 573 } 574 if ((threadState->getLastTransactionBinderFlags() & 575 IBinder::FLAG_ONEWAY) != 0) { 576 // For one-way calls, the callee is running entirely 577 // disconnected from the caller, so disable StrictMode entirely. 578 // Not only does disk/network usage not impact the caller, but 579 // there's no way to commuicate back any violations anyway. 580 threadState->setStrictModePolicy(0); 581 } else { 582 threadState->setStrictModePolicy(strictPolicy); 583 } 584 const String16 str(readString16()); 585 if (str == interface) { 586 return true; 587 } else { 588 ALOGW("**** enforceInterface() expected '%s' but read '%s'", 589 String8(interface).string(), String8(str).string()); 590 return false; 591 } 592} 593 594const binder_size_t* Parcel::objects() const 595{ 596 return mObjects; 597} 598 599size_t Parcel::objectsCount() const 600{ 601 return mObjectsSize; 602} 603 604status_t Parcel::errorCheck() const 605{ 606 return mError; 607} 608 609void Parcel::setError(status_t err) 610{ 611 mError = err; 612} 613 614status_t Parcel::finishWrite(size_t len) 615{ 616 if (len > INT32_MAX) { 617 // don't accept size_t values which may have come from an 618 // inadvertent conversion from a negative int. 619 return BAD_VALUE; 620 } 621 622 //printf("Finish write of %d\n", len); 623 mDataPos += len; 624 ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos); 625 if (mDataPos > mDataSize) { 626 mDataSize = mDataPos; 627 ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize); 628 } 629 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 630 return NO_ERROR; 631} 632 633status_t Parcel::writeUnpadded(const void* data, size_t len) 634{ 635 if (len > INT32_MAX) { 636 // don't accept size_t values which may have come from an 637 // inadvertent conversion from a negative int. 638 return BAD_VALUE; 639 } 640 641 size_t end = mDataPos + len; 642 if (end < mDataPos) { 643 // integer overflow 644 return BAD_VALUE; 645 } 646 647 if (end <= mDataCapacity) { 648restart_write: 649 memcpy(mData+mDataPos, data, len); 650 return finishWrite(len); 651 } 652 653 status_t err = growData(len); 654 if (err == NO_ERROR) goto restart_write; 655 return err; 656} 657 658status_t Parcel::write(const void* data, size_t len) 659{ 660 if (len > INT32_MAX) { 661 // don't accept size_t values which may have come from an 662 // inadvertent conversion from a negative int. 663 return BAD_VALUE; 664 } 665 666 void* const d = writeInplace(len); 667 if (d) { 668 memcpy(d, data, len); 669 return NO_ERROR; 670 } 671 return mError; 672} 673 674void* Parcel::writeInplace(size_t len) 675{ 676 if (len > INT32_MAX) { 677 // don't accept size_t values which may have come from an 678 // inadvertent conversion from a negative int. 679 return NULL; 680 } 681 682 const size_t padded = pad_size(len); 683 684 // sanity check for integer overflow 685 if (mDataPos+padded < mDataPos) { 686 return NULL; 687 } 688 689 if ((mDataPos+padded) <= mDataCapacity) { 690restart_write: 691 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 692 uint8_t* const data = mData+mDataPos; 693 694 // Need to pad at end? 695 if (padded != len) { 696#if BYTE_ORDER == BIG_ENDIAN 697 static const uint32_t mask[4] = { 698 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 699 }; 700#endif 701#if BYTE_ORDER == LITTLE_ENDIAN 702 static const uint32_t mask[4] = { 703 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 704 }; 705#endif 706 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 707 // *reinterpret_cast<void**>(data+padded-4)); 708 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 709 } 710 711 finishWrite(padded); 712 return data; 713 } 714 715 status_t err = growData(padded); 716 if (err == NO_ERROR) goto restart_write; 717 return NULL; 718} 719 720status_t Parcel::writeInt32(int32_t val) 721{ 722 return writeAligned(val); 723} 724 725status_t Parcel::writeUint32(uint32_t val) 726{ 727 return writeAligned(val); 728} 729 730status_t Parcel::writeInt32Array(size_t len, const int32_t *val) { 731 if (len > INT32_MAX) { 732 // don't accept size_t values which may have come from an 733 // inadvertent conversion from a negative int. 734 return BAD_VALUE; 735 } 736 737 if (!val) { 738 return writeInt32(-1); 739 } 740 status_t ret = writeInt32(static_cast<uint32_t>(len)); 741 if (ret == NO_ERROR) { 742 ret = write(val, len * sizeof(*val)); 743 } 744 return ret; 745} 746status_t Parcel::writeByteArray(size_t len, const uint8_t *val) { 747 if (len > INT32_MAX) { 748 // don't accept size_t values which may have come from an 749 // inadvertent conversion from a negative int. 750 return BAD_VALUE; 751 } 752 753 if (!val) { 754 return writeInt32(-1); 755 } 756 status_t ret = writeInt32(static_cast<uint32_t>(len)); 757 if (ret == NO_ERROR) { 758 ret = write(val, len * sizeof(*val)); 759 } 760 return ret; 761} 762 763status_t Parcel::writeBool(bool val) 764{ 765 return writeInt32(int32_t(val)); 766} 767 768status_t Parcel::writeChar(char16_t val) 769{ 770 return writeInt32(int32_t(val)); 771} 772 773status_t Parcel::writeByte(int8_t val) 774{ 775 return writeInt32(int32_t(val)); 776} 777 778status_t Parcel::writeInt64(int64_t val) 779{ 780 return writeAligned(val); 781} 782 783status_t Parcel::writeUint64(uint64_t val) 784{ 785 return writeAligned(val); 786} 787 788status_t Parcel::writePointer(uintptr_t val) 789{ 790 return writeAligned<binder_uintptr_t>(val); 791} 792 793status_t Parcel::writeFloat(float val) 794{ 795 return writeAligned(val); 796} 797 798#if defined(__mips__) && defined(__mips_hard_float) 799 800status_t Parcel::writeDouble(double val) 801{ 802 union { 803 double d; 804 unsigned long long ll; 805 } u; 806 u.d = val; 807 return writeAligned(u.ll); 808} 809 810#else 811 812status_t Parcel::writeDouble(double val) 813{ 814 return writeAligned(val); 815} 816 817#endif 818 819status_t Parcel::writeCString(const char* str) 820{ 821 return write(str, strlen(str)+1); 822} 823 824status_t Parcel::writeString8(const String8& str) 825{ 826 status_t err = writeInt32(str.bytes()); 827 // only write string if its length is more than zero characters, 828 // as readString8 will only read if the length field is non-zero. 829 // this is slightly different from how writeString16 works. 830 if (str.bytes() > 0 && err == NO_ERROR) { 831 err = write(str.string(), str.bytes()+1); 832 } 833 return err; 834} 835 836status_t Parcel::writeString16(const String16& str) 837{ 838 return writeString16(str.string(), str.size()); 839} 840 841status_t Parcel::writeString16(const char16_t* str, size_t len) 842{ 843 if (str == NULL) return writeInt32(-1); 844 845 status_t err = writeInt32(len); 846 if (err == NO_ERROR) { 847 len *= sizeof(char16_t); 848 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 849 if (data) { 850 memcpy(data, str, len); 851 *reinterpret_cast<char16_t*>(data+len) = 0; 852 return NO_ERROR; 853 } 854 err = mError; 855 } 856 return err; 857} 858 859status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 860{ 861 return flatten_binder(ProcessState::self(), val, this); 862} 863 864status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 865{ 866 return flatten_binder(ProcessState::self(), val, this); 867} 868 869status_t Parcel::writeNativeHandle(const native_handle* handle) 870{ 871 if (!handle || handle->version != sizeof(native_handle)) 872 return BAD_TYPE; 873 874 status_t err; 875 err = writeInt32(handle->numFds); 876 if (err != NO_ERROR) return err; 877 878 err = writeInt32(handle->numInts); 879 if (err != NO_ERROR) return err; 880 881 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 882 err = writeDupFileDescriptor(handle->data[i]); 883 884 if (err != NO_ERROR) { 885 ALOGD("write native handle, write dup fd failed"); 886 return err; 887 } 888 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 889 return err; 890} 891 892status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership) 893{ 894 flat_binder_object obj; 895 obj.type = BINDER_TYPE_FD; 896 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 897 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 898 obj.handle = fd; 899 obj.cookie = takeOwnership ? 1 : 0; 900 return writeObject(obj, true); 901} 902 903status_t Parcel::writeDupFileDescriptor(int fd) 904{ 905 int dupFd = dup(fd); 906 if (dupFd < 0) { 907 return -errno; 908 } 909 status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/); 910 if (err) { 911 close(dupFd); 912 } 913 return err; 914} 915 916status_t Parcel::writeBlob(size_t len, bool mutableCopy, WritableBlob* outBlob) 917{ 918 if (len > INT32_MAX) { 919 // don't accept size_t values which may have come from an 920 // inadvertent conversion from a negative int. 921 return BAD_VALUE; 922 } 923 924 status_t status; 925 if (!mAllowFds || len <= BLOB_INPLACE_LIMIT) { 926 ALOGV("writeBlob: write in place"); 927 status = writeInt32(BLOB_INPLACE); 928 if (status) return status; 929 930 void* ptr = writeInplace(len); 931 if (!ptr) return NO_MEMORY; 932 933 outBlob->init(-1, ptr, len, false); 934 return NO_ERROR; 935 } 936 937 ALOGV("writeBlob: write to ashmem"); 938 int fd = ashmem_create_region("Parcel Blob", len); 939 if (fd < 0) return NO_MEMORY; 940 941 mBlobAshmemSize += len; 942 943 int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); 944 if (result < 0) { 945 status = result; 946 } else { 947 void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 948 if (ptr == MAP_FAILED) { 949 status = -errno; 950 } else { 951 if (!mutableCopy) { 952 result = ashmem_set_prot_region(fd, PROT_READ); 953 } 954 if (result < 0) { 955 status = result; 956 } else { 957 status = writeInt32(mutableCopy ? BLOB_ASHMEM_MUTABLE : BLOB_ASHMEM_IMMUTABLE); 958 if (!status) { 959 status = writeFileDescriptor(fd, true /*takeOwnership*/); 960 if (!status) { 961 outBlob->init(fd, ptr, len, mutableCopy); 962 return NO_ERROR; 963 } 964 } 965 } 966 } 967 ::munmap(ptr, len); 968 } 969 ::close(fd); 970 return status; 971} 972 973status_t Parcel::writeDupImmutableBlobFileDescriptor(int fd) 974{ 975 // Must match up with what's done in writeBlob. 976 if (!mAllowFds) return FDS_NOT_ALLOWED; 977 status_t status = writeInt32(BLOB_ASHMEM_IMMUTABLE); 978 if (status) return status; 979 return writeDupFileDescriptor(fd); 980} 981 982status_t Parcel::write(const FlattenableHelperInterface& val) 983{ 984 status_t err; 985 986 // size if needed 987 const size_t len = val.getFlattenedSize(); 988 const size_t fd_count = val.getFdCount(); 989 990 if ((len > INT32_MAX) || (fd_count > INT32_MAX)) { 991 // don't accept size_t values which may have come from an 992 // inadvertent conversion from a negative int. 993 return BAD_VALUE; 994 } 995 996 err = this->writeInt32(len); 997 if (err) return err; 998 999 err = this->writeInt32(fd_count); 1000 if (err) return err; 1001 1002 // payload 1003 void* const buf = this->writeInplace(pad_size(len)); 1004 if (buf == NULL) 1005 return BAD_VALUE; 1006 1007 int* fds = NULL; 1008 if (fd_count) { 1009 fds = new int[fd_count]; 1010 } 1011 1012 err = val.flatten(buf, len, fds, fd_count); 1013 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1014 err = this->writeDupFileDescriptor( fds[i] ); 1015 } 1016 1017 if (fd_count) { 1018 delete [] fds; 1019 } 1020 1021 return err; 1022} 1023 1024status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 1025{ 1026 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 1027 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 1028 if (enoughData && enoughObjects) { 1029restart_write: 1030 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 1031 1032 // remember if it's a file descriptor 1033 if (val.type == BINDER_TYPE_FD) { 1034 if (!mAllowFds) { 1035 // fail before modifying our object index 1036 return FDS_NOT_ALLOWED; 1037 } 1038 mHasFds = mFdsKnown = true; 1039 } 1040 1041 // Need to write meta-data? 1042 if (nullMetaData || val.binder != 0) { 1043 mObjects[mObjectsSize] = mDataPos; 1044 acquire_object(ProcessState::self(), val, this); 1045 mObjectsSize++; 1046 } 1047 1048 return finishWrite(sizeof(flat_binder_object)); 1049 } 1050 1051 if (!enoughData) { 1052 const status_t err = growData(sizeof(val)); 1053 if (err != NO_ERROR) return err; 1054 } 1055 if (!enoughObjects) { 1056 size_t newSize = ((mObjectsSize+2)*3)/2; 1057 if (newSize < mObjectsSize) return NO_MEMORY; // overflow 1058 binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 1059 if (objects == NULL) return NO_MEMORY; 1060 mObjects = objects; 1061 mObjectsCapacity = newSize; 1062 } 1063 1064 goto restart_write; 1065} 1066 1067status_t Parcel::writeNoException() 1068{ 1069 return writeInt32(0); 1070} 1071 1072void Parcel::remove(size_t /*start*/, size_t /*amt*/) 1073{ 1074 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 1075} 1076 1077status_t Parcel::read(void* outData, size_t len) const 1078{ 1079 if (len > INT32_MAX) { 1080 // don't accept size_t values which may have come from an 1081 // inadvertent conversion from a negative int. 1082 return BAD_VALUE; 1083 } 1084 1085 if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize 1086 && len <= pad_size(len)) { 1087 memcpy(outData, mData+mDataPos, len); 1088 mDataPos += pad_size(len); 1089 ALOGV("read Setting data pos of %p to %zu", this, mDataPos); 1090 return NO_ERROR; 1091 } 1092 return NOT_ENOUGH_DATA; 1093} 1094 1095const void* Parcel::readInplace(size_t len) const 1096{ 1097 if (len > INT32_MAX) { 1098 // don't accept size_t values which may have come from an 1099 // inadvertent conversion from a negative int. 1100 return NULL; 1101 } 1102 1103 if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize 1104 && len <= pad_size(len)) { 1105 const void* data = mData+mDataPos; 1106 mDataPos += pad_size(len); 1107 ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos); 1108 return data; 1109 } 1110 return NULL; 1111} 1112 1113template<class T> 1114status_t Parcel::readAligned(T *pArg) const { 1115 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T)); 1116 1117 if ((mDataPos+sizeof(T)) <= mDataSize) { 1118 const void* data = mData+mDataPos; 1119 mDataPos += sizeof(T); 1120 *pArg = *reinterpret_cast<const T*>(data); 1121 return NO_ERROR; 1122 } else { 1123 return NOT_ENOUGH_DATA; 1124 } 1125} 1126 1127template<class T> 1128T Parcel::readAligned() const { 1129 T result; 1130 if (readAligned(&result) != NO_ERROR) { 1131 result = 0; 1132 } 1133 1134 return result; 1135} 1136 1137template<class T> 1138status_t Parcel::writeAligned(T val) { 1139 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T)); 1140 1141 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 1142restart_write: 1143 *reinterpret_cast<T*>(mData+mDataPos) = val; 1144 return finishWrite(sizeof(val)); 1145 } 1146 1147 status_t err = growData(sizeof(val)); 1148 if (err == NO_ERROR) goto restart_write; 1149 return err; 1150} 1151 1152status_t Parcel::readInt32(int32_t *pArg) const 1153{ 1154 return readAligned(pArg); 1155} 1156 1157int32_t Parcel::readInt32() const 1158{ 1159 return readAligned<int32_t>(); 1160} 1161 1162status_t Parcel::readUint32(uint32_t *pArg) const 1163{ 1164 return readAligned(pArg); 1165} 1166 1167uint32_t Parcel::readUint32() const 1168{ 1169 return readAligned<uint32_t>(); 1170} 1171 1172status_t Parcel::readInt64(int64_t *pArg) const 1173{ 1174 return readAligned(pArg); 1175} 1176 1177 1178int64_t Parcel::readInt64() const 1179{ 1180 return readAligned<int64_t>(); 1181} 1182 1183status_t Parcel::readUint64(uint64_t *pArg) const 1184{ 1185 return readAligned(pArg); 1186} 1187 1188uint64_t Parcel::readUint64() const 1189{ 1190 return readAligned<uint64_t>(); 1191} 1192 1193status_t Parcel::readPointer(uintptr_t *pArg) const 1194{ 1195 status_t ret; 1196 binder_uintptr_t ptr; 1197 ret = readAligned(&ptr); 1198 if (!ret) 1199 *pArg = ptr; 1200 return ret; 1201} 1202 1203uintptr_t Parcel::readPointer() const 1204{ 1205 return readAligned<binder_uintptr_t>(); 1206} 1207 1208 1209status_t Parcel::readFloat(float *pArg) const 1210{ 1211 return readAligned(pArg); 1212} 1213 1214 1215float Parcel::readFloat() const 1216{ 1217 return readAligned<float>(); 1218} 1219 1220#if defined(__mips__) && defined(__mips_hard_float) 1221 1222status_t Parcel::readDouble(double *pArg) const 1223{ 1224 union { 1225 double d; 1226 unsigned long long ll; 1227 } u; 1228 u.d = 0; 1229 status_t status; 1230 status = readAligned(&u.ll); 1231 *pArg = u.d; 1232 return status; 1233} 1234 1235double Parcel::readDouble() const 1236{ 1237 union { 1238 double d; 1239 unsigned long long ll; 1240 } u; 1241 u.ll = readAligned<unsigned long long>(); 1242 return u.d; 1243} 1244 1245#else 1246 1247status_t Parcel::readDouble(double *pArg) const 1248{ 1249 return readAligned(pArg); 1250} 1251 1252double Parcel::readDouble() const 1253{ 1254 return readAligned<double>(); 1255} 1256 1257#endif 1258 1259status_t Parcel::readIntPtr(intptr_t *pArg) const 1260{ 1261 return readAligned(pArg); 1262} 1263 1264 1265intptr_t Parcel::readIntPtr() const 1266{ 1267 return readAligned<intptr_t>(); 1268} 1269 1270status_t Parcel::readBool(bool *pArg) const 1271{ 1272 int32_t tmp; 1273 status_t ret = readInt32(&tmp); 1274 *pArg = (tmp != 0); 1275 return ret; 1276} 1277 1278bool Parcel::readBool() const 1279{ 1280 return readInt32() != 0; 1281} 1282 1283status_t Parcel::readChar(char16_t *pArg) const 1284{ 1285 int32_t tmp; 1286 status_t ret = readInt32(&tmp); 1287 *pArg = char16_t(tmp); 1288 return ret; 1289} 1290 1291char16_t Parcel::readChar() const 1292{ 1293 return char16_t(readInt32()); 1294} 1295 1296status_t Parcel::readByte(int8_t *pArg) const 1297{ 1298 int32_t tmp; 1299 status_t ret = readInt32(&tmp); 1300 *pArg = int8_t(tmp); 1301 return ret; 1302} 1303 1304int8_t Parcel::readByte() const 1305{ 1306 return int8_t(readInt32()); 1307} 1308 1309const char* Parcel::readCString() const 1310{ 1311 const size_t avail = mDataSize-mDataPos; 1312 if (avail > 0) { 1313 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 1314 // is the string's trailing NUL within the parcel's valid bounds? 1315 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 1316 if (eos) { 1317 const size_t len = eos - str; 1318 mDataPos += pad_size(len+1); 1319 ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos); 1320 return str; 1321 } 1322 } 1323 return NULL; 1324} 1325 1326String8 Parcel::readString8() const 1327{ 1328 int32_t size = readInt32(); 1329 // watch for potential int overflow adding 1 for trailing NUL 1330 if (size > 0 && size < INT32_MAX) { 1331 const char* str = (const char*)readInplace(size+1); 1332 if (str) return String8(str, size); 1333 } 1334 return String8(); 1335} 1336 1337String16 Parcel::readString16() const 1338{ 1339 size_t len; 1340 const char16_t* str = readString16Inplace(&len); 1341 if (str) return String16(str, len); 1342 ALOGE("Reading a NULL string not supported here."); 1343 return String16(); 1344} 1345 1346const char16_t* Parcel::readString16Inplace(size_t* outLen) const 1347{ 1348 int32_t size = readInt32(); 1349 // watch for potential int overflow from size+1 1350 if (size >= 0 && size < INT32_MAX) { 1351 *outLen = size; 1352 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 1353 if (str != NULL) { 1354 return str; 1355 } 1356 } 1357 *outLen = 0; 1358 return NULL; 1359} 1360 1361sp<IBinder> Parcel::readStrongBinder() const 1362{ 1363 sp<IBinder> val; 1364 unflatten_binder(ProcessState::self(), *this, &val); 1365 return val; 1366} 1367 1368wp<IBinder> Parcel::readWeakBinder() const 1369{ 1370 wp<IBinder> val; 1371 unflatten_binder(ProcessState::self(), *this, &val); 1372 return val; 1373} 1374 1375int32_t Parcel::readExceptionCode() const 1376{ 1377 int32_t exception_code = readAligned<int32_t>(); 1378 if (exception_code == EX_HAS_REPLY_HEADER) { 1379 int32_t header_start = dataPosition(); 1380 int32_t header_size = readAligned<int32_t>(); 1381 // Skip over fat responses headers. Not used (or propagated) in 1382 // native code 1383 setDataPosition(header_start + header_size); 1384 // And fat response headers are currently only used when there are no 1385 // exceptions, so return no error: 1386 return 0; 1387 } 1388 return exception_code; 1389} 1390 1391native_handle* Parcel::readNativeHandle() const 1392{ 1393 int numFds, numInts; 1394 status_t err; 1395 err = readInt32(&numFds); 1396 if (err != NO_ERROR) return 0; 1397 err = readInt32(&numInts); 1398 if (err != NO_ERROR) return 0; 1399 1400 native_handle* h = native_handle_create(numFds, numInts); 1401 if (!h) { 1402 return 0; 1403 } 1404 1405 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 1406 h->data[i] = dup(readFileDescriptor()); 1407 if (h->data[i] < 0) err = BAD_VALUE; 1408 } 1409 err = read(h->data + numFds, sizeof(int)*numInts); 1410 if (err != NO_ERROR) { 1411 native_handle_close(h); 1412 native_handle_delete(h); 1413 h = 0; 1414 } 1415 return h; 1416} 1417 1418 1419int Parcel::readFileDescriptor() const 1420{ 1421 const flat_binder_object* flat = readObject(true); 1422 if (flat) { 1423 switch (flat->type) { 1424 case BINDER_TYPE_FD: 1425 //ALOGI("Returning file descriptor %ld from parcel %p", flat->handle, this); 1426 return flat->handle; 1427 } 1428 } 1429 return BAD_TYPE; 1430} 1431 1432status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const 1433{ 1434 int32_t blobType; 1435 status_t status = readInt32(&blobType); 1436 if (status) return status; 1437 1438 if (blobType == BLOB_INPLACE) { 1439 ALOGV("readBlob: read in place"); 1440 const void* ptr = readInplace(len); 1441 if (!ptr) return BAD_VALUE; 1442 1443 outBlob->init(-1, const_cast<void*>(ptr), len, false); 1444 return NO_ERROR; 1445 } 1446 1447 ALOGV("readBlob: read from ashmem"); 1448 bool isMutable = (blobType == BLOB_ASHMEM_MUTABLE); 1449 int fd = readFileDescriptor(); 1450 if (fd == int(BAD_TYPE)) return BAD_VALUE; 1451 1452 void* ptr = ::mmap(NULL, len, isMutable ? PROT_READ | PROT_WRITE : PROT_READ, 1453 MAP_SHARED, fd, 0); 1454 if (ptr == MAP_FAILED) return NO_MEMORY; 1455 1456 outBlob->init(fd, ptr, len, isMutable); 1457 return NO_ERROR; 1458} 1459 1460status_t Parcel::read(FlattenableHelperInterface& val) const 1461{ 1462 // size 1463 const size_t len = this->readInt32(); 1464 const size_t fd_count = this->readInt32(); 1465 1466 if (len > INT32_MAX) { 1467 // don't accept size_t values which may have come from an 1468 // inadvertent conversion from a negative int. 1469 return BAD_VALUE; 1470 } 1471 1472 // payload 1473 void const* const buf = this->readInplace(pad_size(len)); 1474 if (buf == NULL) 1475 return BAD_VALUE; 1476 1477 int* fds = NULL; 1478 if (fd_count) { 1479 fds = new int[fd_count]; 1480 } 1481 1482 status_t err = NO_ERROR; 1483 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1484 fds[i] = dup(this->readFileDescriptor()); 1485 if (fds[i] < 0) { 1486 err = BAD_VALUE; 1487 ALOGE("dup() failed in Parcel::read, i is %zu, fds[i] is %d, fd_count is %zu, error: %s", 1488 i, fds[i], fd_count, strerror(errno)); 1489 } 1490 } 1491 1492 if (err == NO_ERROR) { 1493 err = val.unflatten(buf, len, fds, fd_count); 1494 } 1495 1496 if (fd_count) { 1497 delete [] fds; 1498 } 1499 1500 return err; 1501} 1502const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1503{ 1504 const size_t DPOS = mDataPos; 1505 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1506 const flat_binder_object* obj 1507 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1508 mDataPos = DPOS + sizeof(flat_binder_object); 1509 if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) { 1510 // When transferring a NULL object, we don't write it into 1511 // the object list, so we don't want to check for it when 1512 // reading. 1513 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1514 return obj; 1515 } 1516 1517 // Ensure that this object is valid... 1518 binder_size_t* const OBJS = mObjects; 1519 const size_t N = mObjectsSize; 1520 size_t opos = mNextObjectHint; 1521 1522 if (N > 0) { 1523 ALOGV("Parcel %p looking for obj at %zu, hint=%zu", 1524 this, DPOS, opos); 1525 1526 // Start at the current hint position, looking for an object at 1527 // the current data position. 1528 if (opos < N) { 1529 while (opos < (N-1) && OBJS[opos] < DPOS) { 1530 opos++; 1531 } 1532 } else { 1533 opos = N-1; 1534 } 1535 if (OBJS[opos] == DPOS) { 1536 // Found it! 1537 ALOGV("Parcel %p found obj %zu at index %zu with forward search", 1538 this, DPOS, opos); 1539 mNextObjectHint = opos+1; 1540 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1541 return obj; 1542 } 1543 1544 // Look backwards for it... 1545 while (opos > 0 && OBJS[opos] > DPOS) { 1546 opos--; 1547 } 1548 if (OBJS[opos] == DPOS) { 1549 // Found it! 1550 ALOGV("Parcel %p found obj %zu at index %zu with backward search", 1551 this, DPOS, opos); 1552 mNextObjectHint = opos+1; 1553 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1554 return obj; 1555 } 1556 } 1557 ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list", 1558 this, DPOS); 1559 } 1560 return NULL; 1561} 1562 1563void Parcel::closeFileDescriptors() 1564{ 1565 size_t i = mObjectsSize; 1566 if (i > 0) { 1567 //ALOGI("Closing file descriptors for %zu objects...", i); 1568 } 1569 while (i > 0) { 1570 i--; 1571 const flat_binder_object* flat 1572 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1573 if (flat->type == BINDER_TYPE_FD) { 1574 //ALOGI("Closing fd: %ld", flat->handle); 1575 close(flat->handle); 1576 } 1577 } 1578} 1579 1580uintptr_t Parcel::ipcData() const 1581{ 1582 return reinterpret_cast<uintptr_t>(mData); 1583} 1584 1585size_t Parcel::ipcDataSize() const 1586{ 1587 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1588} 1589 1590uintptr_t Parcel::ipcObjects() const 1591{ 1592 return reinterpret_cast<uintptr_t>(mObjects); 1593} 1594 1595size_t Parcel::ipcObjectsCount() const 1596{ 1597 return mObjectsSize; 1598} 1599 1600void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1601 const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1602{ 1603 binder_size_t minOffset = 0; 1604 freeDataNoInit(); 1605 mError = NO_ERROR; 1606 mData = const_cast<uint8_t*>(data); 1607 mDataSize = mDataCapacity = dataSize; 1608 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid()); 1609 mDataPos = 0; 1610 ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos); 1611 mObjects = const_cast<binder_size_t*>(objects); 1612 mObjectsSize = mObjectsCapacity = objectsCount; 1613 mNextObjectHint = 0; 1614 mOwner = relFunc; 1615 mOwnerCookie = relCookie; 1616 for (size_t i = 0; i < mObjectsSize; i++) { 1617 binder_size_t offset = mObjects[i]; 1618 if (offset < minOffset) { 1619 ALOGE("%s: bad object offset %" PRIu64 " < %" PRIu64 "\n", 1620 __func__, (uint64_t)offset, (uint64_t)minOffset); 1621 mObjectsSize = 0; 1622 break; 1623 } 1624 minOffset = offset + sizeof(flat_binder_object); 1625 } 1626 scanForFds(); 1627} 1628 1629void Parcel::print(TextOutput& to, uint32_t /*flags*/) const 1630{ 1631 to << "Parcel("; 1632 1633 if (errorCheck() != NO_ERROR) { 1634 const status_t err = errorCheck(); 1635 to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\""; 1636 } else if (dataSize() > 0) { 1637 const uint8_t* DATA = data(); 1638 to << indent << HexDump(DATA, dataSize()) << dedent; 1639 const binder_size_t* OBJS = objects(); 1640 const size_t N = objectsCount(); 1641 for (size_t i=0; i<N; i++) { 1642 const flat_binder_object* flat 1643 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1644 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1645 << TypeCode(flat->type & 0x7f7f7f00) 1646 << " = " << flat->binder; 1647 } 1648 } else { 1649 to << "NULL"; 1650 } 1651 1652 to << ")"; 1653} 1654 1655void Parcel::releaseObjects() 1656{ 1657 const sp<ProcessState> proc(ProcessState::self()); 1658 size_t i = mObjectsSize; 1659 uint8_t* const data = mData; 1660 binder_size_t* const objects = mObjects; 1661 while (i > 0) { 1662 i--; 1663 const flat_binder_object* flat 1664 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1665 release_object(proc, *flat, this); 1666 } 1667} 1668 1669void Parcel::acquireObjects() 1670{ 1671 const sp<ProcessState> proc(ProcessState::self()); 1672 size_t i = mObjectsSize; 1673 uint8_t* const data = mData; 1674 binder_size_t* const objects = mObjects; 1675 while (i > 0) { 1676 i--; 1677 const flat_binder_object* flat 1678 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1679 acquire_object(proc, *flat, this); 1680 } 1681} 1682 1683void Parcel::freeData() 1684{ 1685 freeDataNoInit(); 1686 initState(); 1687} 1688 1689void Parcel::freeDataNoInit() 1690{ 1691 if (mOwner) { 1692 LOG_ALLOC("Parcel %p: freeing other owner data", this); 1693 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1694 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1695 } else { 1696 LOG_ALLOC("Parcel %p: freeing allocated data", this); 1697 releaseObjects(); 1698 if (mData) { 1699 LOG_ALLOC("Parcel %p: freeing with %zu capacity", this, mDataCapacity); 1700 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1701 if (mDataCapacity <= gParcelGlobalAllocSize) { 1702 gParcelGlobalAllocSize = gParcelGlobalAllocSize - mDataCapacity; 1703 } else { 1704 gParcelGlobalAllocSize = 0; 1705 } 1706 if (gParcelGlobalAllocCount > 0) { 1707 gParcelGlobalAllocCount--; 1708 } 1709 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1710 free(mData); 1711 } 1712 if (mObjects) free(mObjects); 1713 } 1714} 1715 1716status_t Parcel::growData(size_t len) 1717{ 1718 if (len > INT32_MAX) { 1719 // don't accept size_t values which may have come from an 1720 // inadvertent conversion from a negative int. 1721 return BAD_VALUE; 1722 } 1723 1724 size_t newSize = ((mDataSize+len)*3)/2; 1725 return (newSize <= mDataSize) 1726 ? (status_t) NO_MEMORY 1727 : continueWrite(newSize); 1728} 1729 1730status_t Parcel::restartWrite(size_t desired) 1731{ 1732 if (desired > INT32_MAX) { 1733 // don't accept size_t values which may have come from an 1734 // inadvertent conversion from a negative int. 1735 return BAD_VALUE; 1736 } 1737 1738 if (mOwner) { 1739 freeData(); 1740 return continueWrite(desired); 1741 } 1742 1743 uint8_t* data = (uint8_t*)realloc(mData, desired); 1744 if (!data && desired > mDataCapacity) { 1745 mError = NO_MEMORY; 1746 return NO_MEMORY; 1747 } 1748 1749 releaseObjects(); 1750 1751 if (data) { 1752 LOG_ALLOC("Parcel %p: restart from %zu to %zu capacity", this, mDataCapacity, desired); 1753 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1754 gParcelGlobalAllocSize += desired; 1755 gParcelGlobalAllocSize -= mDataCapacity; 1756 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1757 mData = data; 1758 mDataCapacity = desired; 1759 } 1760 1761 mDataSize = mDataPos = 0; 1762 ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize); 1763 ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos); 1764 1765 free(mObjects); 1766 mObjects = NULL; 1767 mObjectsSize = mObjectsCapacity = 0; 1768 mNextObjectHint = 0; 1769 mHasFds = false; 1770 mFdsKnown = true; 1771 mAllowFds = true; 1772 1773 return NO_ERROR; 1774} 1775 1776status_t Parcel::continueWrite(size_t desired) 1777{ 1778 if (desired > INT32_MAX) { 1779 // don't accept size_t values which may have come from an 1780 // inadvertent conversion from a negative int. 1781 return BAD_VALUE; 1782 } 1783 1784 // If shrinking, first adjust for any objects that appear 1785 // after the new data size. 1786 size_t objectsSize = mObjectsSize; 1787 if (desired < mDataSize) { 1788 if (desired == 0) { 1789 objectsSize = 0; 1790 } else { 1791 while (objectsSize > 0) { 1792 if (mObjects[objectsSize-1] < desired) 1793 break; 1794 objectsSize--; 1795 } 1796 } 1797 } 1798 1799 if (mOwner) { 1800 // If the size is going to zero, just release the owner's data. 1801 if (desired == 0) { 1802 freeData(); 1803 return NO_ERROR; 1804 } 1805 1806 // If there is a different owner, we need to take 1807 // posession. 1808 uint8_t* data = (uint8_t*)malloc(desired); 1809 if (!data) { 1810 mError = NO_MEMORY; 1811 return NO_MEMORY; 1812 } 1813 binder_size_t* objects = NULL; 1814 1815 if (objectsSize) { 1816 objects = (binder_size_t*)calloc(objectsSize, sizeof(binder_size_t)); 1817 if (!objects) { 1818 free(data); 1819 1820 mError = NO_MEMORY; 1821 return NO_MEMORY; 1822 } 1823 1824 // Little hack to only acquire references on objects 1825 // we will be keeping. 1826 size_t oldObjectsSize = mObjectsSize; 1827 mObjectsSize = objectsSize; 1828 acquireObjects(); 1829 mObjectsSize = oldObjectsSize; 1830 } 1831 1832 if (mData) { 1833 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1834 } 1835 if (objects && mObjects) { 1836 memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t)); 1837 } 1838 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1839 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1840 mOwner = NULL; 1841 1842 LOG_ALLOC("Parcel %p: taking ownership of %zu capacity", this, desired); 1843 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1844 gParcelGlobalAllocSize += desired; 1845 gParcelGlobalAllocCount++; 1846 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1847 1848 mData = data; 1849 mObjects = objects; 1850 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1851 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1852 mDataCapacity = desired; 1853 mObjectsSize = mObjectsCapacity = objectsSize; 1854 mNextObjectHint = 0; 1855 1856 } else if (mData) { 1857 if (objectsSize < mObjectsSize) { 1858 // Need to release refs on any objects we are dropping. 1859 const sp<ProcessState> proc(ProcessState::self()); 1860 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1861 const flat_binder_object* flat 1862 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1863 if (flat->type == BINDER_TYPE_FD) { 1864 // will need to rescan because we may have lopped off the only FDs 1865 mFdsKnown = false; 1866 } 1867 release_object(proc, *flat, this); 1868 } 1869 binder_size_t* objects = 1870 (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t)); 1871 if (objects) { 1872 mObjects = objects; 1873 } 1874 mObjectsSize = objectsSize; 1875 mNextObjectHint = 0; 1876 } 1877 1878 // We own the data, so we can just do a realloc(). 1879 if (desired > mDataCapacity) { 1880 uint8_t* data = (uint8_t*)realloc(mData, desired); 1881 if (data) { 1882 LOG_ALLOC("Parcel %p: continue from %zu to %zu capacity", this, mDataCapacity, 1883 desired); 1884 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1885 gParcelGlobalAllocSize += desired; 1886 gParcelGlobalAllocSize -= mDataCapacity; 1887 gParcelGlobalAllocCount++; 1888 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1889 mData = data; 1890 mDataCapacity = desired; 1891 } else if (desired > mDataCapacity) { 1892 mError = NO_MEMORY; 1893 return NO_MEMORY; 1894 } 1895 } else { 1896 if (mDataSize > desired) { 1897 mDataSize = desired; 1898 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1899 } 1900 if (mDataPos > desired) { 1901 mDataPos = desired; 1902 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1903 } 1904 } 1905 1906 } else { 1907 // This is the first data. Easy! 1908 uint8_t* data = (uint8_t*)malloc(desired); 1909 if (!data) { 1910 mError = NO_MEMORY; 1911 return NO_MEMORY; 1912 } 1913 1914 if(!(mDataCapacity == 0 && mObjects == NULL 1915 && mObjectsCapacity == 0)) { 1916 ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired); 1917 } 1918 1919 LOG_ALLOC("Parcel %p: allocating with %zu capacity", this, desired); 1920 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1921 gParcelGlobalAllocSize += desired; 1922 gParcelGlobalAllocCount++; 1923 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1924 1925 mData = data; 1926 mDataSize = mDataPos = 0; 1927 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1928 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1929 mDataCapacity = desired; 1930 } 1931 1932 return NO_ERROR; 1933} 1934 1935void Parcel::initState() 1936{ 1937 LOG_ALLOC("Parcel %p: initState", this); 1938 mError = NO_ERROR; 1939 mData = 0; 1940 mDataSize = 0; 1941 mDataCapacity = 0; 1942 mDataPos = 0; 1943 ALOGV("initState Setting data size of %p to %zu", this, mDataSize); 1944 ALOGV("initState Setting data pos of %p to %zu", this, mDataPos); 1945 mObjects = NULL; 1946 mObjectsSize = 0; 1947 mObjectsCapacity = 0; 1948 mNextObjectHint = 0; 1949 mHasFds = false; 1950 mFdsKnown = true; 1951 mAllowFds = true; 1952 mOwner = NULL; 1953 mBlobAshmemSize = 0; 1954} 1955 1956void Parcel::scanForFds() const 1957{ 1958 bool hasFds = false; 1959 for (size_t i=0; i<mObjectsSize; i++) { 1960 const flat_binder_object* flat 1961 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1962 if (flat->type == BINDER_TYPE_FD) { 1963 hasFds = true; 1964 break; 1965 } 1966 } 1967 mHasFds = hasFds; 1968 mFdsKnown = true; 1969} 1970 1971size_t Parcel::getBlobAshmemSize() const 1972{ 1973 return mBlobAshmemSize; 1974} 1975 1976// --- Parcel::Blob --- 1977 1978Parcel::Blob::Blob() : 1979 mFd(-1), mData(NULL), mSize(0), mMutable(false) { 1980} 1981 1982Parcel::Blob::~Blob() { 1983 release(); 1984} 1985 1986void Parcel::Blob::release() { 1987 if (mFd != -1 && mData) { 1988 ::munmap(mData, mSize); 1989 } 1990 clear(); 1991} 1992 1993void Parcel::Blob::init(int fd, void* data, size_t size, bool isMutable) { 1994 mFd = fd; 1995 mData = data; 1996 mSize = size; 1997 mMutable = isMutable; 1998} 1999 2000void Parcel::Blob::clear() { 2001 mFd = -1; 2002 mData = NULL; 2003 mSize = 0; 2004 mMutable = false; 2005} 2006 2007}; // namespace android 2008