Parcel.cpp revision 9e6d2ee0302c6f6108488237821958c42ac380a1
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// Maximum size of a blob to transfer in-place. 76static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024; 77 78// XXX This can be made public if we want to provide 79// support for typed data. 80struct small_flat_data 81{ 82 uint32_t type; 83 uint32_t data; 84}; 85 86namespace android { 87 88static pthread_mutex_t gParcelGlobalAllocSizeLock = PTHREAD_MUTEX_INITIALIZER; 89static size_t gParcelGlobalAllocSize = 0; 90static size_t gParcelGlobalAllocCount = 0; 91 92void acquire_object(const sp<ProcessState>& proc, 93 const flat_binder_object& obj, const void* who) 94{ 95 switch (obj.type) { 96 case BINDER_TYPE_BINDER: 97 if (obj.binder) { 98 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 99 reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who); 100 } 101 return; 102 case BINDER_TYPE_WEAK_BINDER: 103 if (obj.binder) 104 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 105 return; 106 case BINDER_TYPE_HANDLE: { 107 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 108 if (b != NULL) { 109 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 110 b->incStrong(who); 111 } 112 return; 113 } 114 case BINDER_TYPE_WEAK_HANDLE: { 115 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 116 if (b != NULL) b.get_refs()->incWeak(who); 117 return; 118 } 119 case BINDER_TYPE_FD: { 120 // intentionally blank -- nothing to do to acquire this, but we do 121 // recognize it as a legitimate object type. 122 return; 123 } 124 } 125 126 ALOGD("Invalid object type 0x%08x", obj.type); 127} 128 129void release_object(const sp<ProcessState>& proc, 130 const flat_binder_object& obj, const void* who) 131{ 132 switch (obj.type) { 133 case BINDER_TYPE_BINDER: 134 if (obj.binder) { 135 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 136 reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who); 137 } 138 return; 139 case BINDER_TYPE_WEAK_BINDER: 140 if (obj.binder) 141 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 142 return; 143 case BINDER_TYPE_HANDLE: { 144 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 145 if (b != NULL) { 146 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 147 b->decStrong(who); 148 } 149 return; 150 } 151 case BINDER_TYPE_WEAK_HANDLE: { 152 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 153 if (b != NULL) b.get_refs()->decWeak(who); 154 return; 155 } 156 case BINDER_TYPE_FD: { 157 if (obj.cookie != 0) close(obj.handle); 158 return; 159 } 160 } 161 162 ALOGE("Invalid object type 0x%08x", obj.type); 163} 164 165inline static status_t finish_flatten_binder( 166 const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out) 167{ 168 return out->writeObject(flat, false); 169} 170 171status_t flatten_binder(const sp<ProcessState>& /*proc*/, 172 const sp<IBinder>& binder, Parcel* out) 173{ 174 flat_binder_object obj; 175 176 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 177 if (binder != NULL) { 178 IBinder *local = binder->localBinder(); 179 if (!local) { 180 BpBinder *proxy = binder->remoteBinder(); 181 if (proxy == NULL) { 182 ALOGE("null proxy"); 183 } 184 const int32_t handle = proxy ? proxy->handle() : 0; 185 obj.type = BINDER_TYPE_HANDLE; 186 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 187 obj.handle = handle; 188 obj.cookie = 0; 189 } else { 190 obj.type = BINDER_TYPE_BINDER; 191 obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs()); 192 obj.cookie = reinterpret_cast<uintptr_t>(local); 193 } 194 } else { 195 obj.type = BINDER_TYPE_BINDER; 196 obj.binder = 0; 197 obj.cookie = 0; 198 } 199 200 return finish_flatten_binder(binder, obj, out); 201} 202 203status_t flatten_binder(const sp<ProcessState>& /*proc*/, 204 const wp<IBinder>& binder, Parcel* out) 205{ 206 flat_binder_object obj; 207 208 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 209 if (binder != NULL) { 210 sp<IBinder> real = binder.promote(); 211 if (real != NULL) { 212 IBinder *local = real->localBinder(); 213 if (!local) { 214 BpBinder *proxy = real->remoteBinder(); 215 if (proxy == NULL) { 216 ALOGE("null proxy"); 217 } 218 const int32_t handle = proxy ? proxy->handle() : 0; 219 obj.type = BINDER_TYPE_WEAK_HANDLE; 220 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 221 obj.handle = handle; 222 obj.cookie = 0; 223 } else { 224 obj.type = BINDER_TYPE_WEAK_BINDER; 225 obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs()); 226 obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get()); 227 } 228 return finish_flatten_binder(real, obj, out); 229 } 230 231 // XXX How to deal? In order to flatten the given binder, 232 // we need to probe it for information, which requires a primary 233 // reference... but we don't have one. 234 // 235 // The OpenBinder implementation uses a dynamic_cast<> here, 236 // but we can't do that with the different reference counting 237 // implementation we are using. 238 ALOGE("Unable to unflatten Binder weak reference!"); 239 obj.type = BINDER_TYPE_BINDER; 240 obj.binder = 0; 241 obj.cookie = 0; 242 return finish_flatten_binder(NULL, obj, out); 243 244 } else { 245 obj.type = BINDER_TYPE_BINDER; 246 obj.binder = 0; 247 obj.cookie = 0; 248 return finish_flatten_binder(NULL, obj, out); 249 } 250} 251 252inline static status_t finish_unflatten_binder( 253 BpBinder* /*proxy*/, const flat_binder_object& /*flat*/, 254 const Parcel& /*in*/) 255{ 256 return NO_ERROR; 257} 258 259status_t unflatten_binder(const sp<ProcessState>& proc, 260 const Parcel& in, sp<IBinder>* out) 261{ 262 const flat_binder_object* flat = in.readObject(false); 263 264 if (flat) { 265 switch (flat->type) { 266 case BINDER_TYPE_BINDER: 267 *out = reinterpret_cast<IBinder*>(flat->cookie); 268 return finish_unflatten_binder(NULL, *flat, in); 269 case BINDER_TYPE_HANDLE: 270 *out = proc->getStrongProxyForHandle(flat->handle); 271 return finish_unflatten_binder( 272 static_cast<BpBinder*>(out->get()), *flat, in); 273 } 274 } 275 return BAD_TYPE; 276} 277 278status_t unflatten_binder(const sp<ProcessState>& proc, 279 const Parcel& in, wp<IBinder>* out) 280{ 281 const flat_binder_object* flat = in.readObject(false); 282 283 if (flat) { 284 switch (flat->type) { 285 case BINDER_TYPE_BINDER: 286 *out = reinterpret_cast<IBinder*>(flat->cookie); 287 return finish_unflatten_binder(NULL, *flat, in); 288 case BINDER_TYPE_WEAK_BINDER: 289 if (flat->binder != 0) { 290 out->set_object_and_refs( 291 reinterpret_cast<IBinder*>(flat->cookie), 292 reinterpret_cast<RefBase::weakref_type*>(flat->binder)); 293 } else { 294 *out = NULL; 295 } 296 return finish_unflatten_binder(NULL, *flat, in); 297 case BINDER_TYPE_HANDLE: 298 case BINDER_TYPE_WEAK_HANDLE: 299 *out = proc->getWeakProxyForHandle(flat->handle); 300 return finish_unflatten_binder( 301 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 302 } 303 } 304 return BAD_TYPE; 305} 306 307// --------------------------------------------------------------------------- 308 309Parcel::Parcel() 310{ 311 LOG_ALLOC("Parcel %p: constructing", this); 312 initState(); 313} 314 315Parcel::~Parcel() 316{ 317 freeDataNoInit(); 318 LOG_ALLOC("Parcel %p: destroyed", this); 319} 320 321size_t Parcel::getGlobalAllocSize() { 322 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 323 size_t size = gParcelGlobalAllocSize; 324 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 325 return size; 326} 327 328size_t Parcel::getGlobalAllocCount() { 329 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 330 size_t count = gParcelGlobalAllocCount; 331 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 332 return count; 333} 334 335const uint8_t* Parcel::data() const 336{ 337 return mData; 338} 339 340size_t Parcel::dataSize() const 341{ 342 return (mDataSize > mDataPos ? mDataSize : mDataPos); 343} 344 345size_t Parcel::dataAvail() const 346{ 347 // TODO: decide what to do about the possibility that this can 348 // report an available-data size that exceeds a Java int's max 349 // positive value, causing havoc. Fortunately this will only 350 // happen if someone constructs a Parcel containing more than two 351 // gigabytes of data, which on typical phone hardware is simply 352 // not possible. 353 return dataSize() - dataPosition(); 354} 355 356size_t Parcel::dataPosition() const 357{ 358 return mDataPos; 359} 360 361size_t Parcel::dataCapacity() const 362{ 363 return mDataCapacity; 364} 365 366status_t Parcel::setDataSize(size_t size) 367{ 368 if (size > INT32_MAX) { 369 // don't accept size_t values which may have come from an 370 // inadvertent conversion from a negative int. 371 return BAD_VALUE; 372 } 373 374 status_t err; 375 err = continueWrite(size); 376 if (err == NO_ERROR) { 377 mDataSize = size; 378 ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize); 379 } 380 return err; 381} 382 383void Parcel::setDataPosition(size_t pos) const 384{ 385 if (pos > INT32_MAX) { 386 // don't accept size_t values which may have come from an 387 // inadvertent conversion from a negative int. 388 abort(); 389 } 390 391 mDataPos = pos; 392 mNextObjectHint = 0; 393} 394 395status_t Parcel::setDataCapacity(size_t size) 396{ 397 if (size > INT32_MAX) { 398 // don't accept size_t values which may have come from an 399 // inadvertent conversion from a negative int. 400 return BAD_VALUE; 401 } 402 403 if (size > mDataCapacity) return continueWrite(size); 404 return NO_ERROR; 405} 406 407status_t Parcel::setData(const uint8_t* buffer, size_t len) 408{ 409 if (len > INT32_MAX) { 410 // don't accept size_t values which may have come from an 411 // inadvertent conversion from a negative int. 412 return BAD_VALUE; 413 } 414 415 status_t err = restartWrite(len); 416 if (err == NO_ERROR) { 417 memcpy(const_cast<uint8_t*>(data()), buffer, len); 418 mDataSize = len; 419 mFdsKnown = false; 420 } 421 return err; 422} 423 424status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len) 425{ 426 const sp<ProcessState> proc(ProcessState::self()); 427 status_t err; 428 const uint8_t *data = parcel->mData; 429 const binder_size_t *objects = parcel->mObjects; 430 size_t size = parcel->mObjectsSize; 431 int startPos = mDataPos; 432 int firstIndex = -1, lastIndex = -2; 433 434 if (len == 0) { 435 return NO_ERROR; 436 } 437 438 if (len > INT32_MAX) { 439 // don't accept size_t values which may have come from an 440 // inadvertent conversion from a negative int. 441 return BAD_VALUE; 442 } 443 444 // range checks against the source parcel size 445 if ((offset > parcel->mDataSize) 446 || (len > parcel->mDataSize) 447 || (offset + len > parcel->mDataSize)) { 448 return BAD_VALUE; 449 } 450 451 // Count objects in range 452 for (int i = 0; i < (int) size; i++) { 453 size_t off = objects[i]; 454 if ((off >= offset) && (off + sizeof(flat_binder_object) <= offset + len)) { 455 if (firstIndex == -1) { 456 firstIndex = i; 457 } 458 lastIndex = i; 459 } 460 } 461 int numObjects = lastIndex - firstIndex + 1; 462 463 if ((mDataSize+len) > mDataCapacity) { 464 // grow data 465 err = growData(len); 466 if (err != NO_ERROR) { 467 return err; 468 } 469 } 470 471 // append data 472 memcpy(mData + mDataPos, data + offset, len); 473 mDataPos += len; 474 mDataSize += len; 475 476 err = NO_ERROR; 477 478 if (numObjects > 0) { 479 // grow objects 480 if (mObjectsCapacity < mObjectsSize + numObjects) { 481 int newSize = ((mObjectsSize + numObjects)*3)/2; 482 binder_size_t *objects = 483 (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 484 if (objects == (binder_size_t*)0) { 485 return NO_MEMORY; 486 } 487 mObjects = objects; 488 mObjectsCapacity = newSize; 489 } 490 491 // append and acquire objects 492 int idx = mObjectsSize; 493 for (int i = firstIndex; i <= lastIndex; i++) { 494 size_t off = objects[i] - offset + startPos; 495 mObjects[idx++] = off; 496 mObjectsSize++; 497 498 flat_binder_object* flat 499 = reinterpret_cast<flat_binder_object*>(mData + off); 500 acquire_object(proc, *flat, this); 501 502 if (flat->type == BINDER_TYPE_FD) { 503 // If this is a file descriptor, we need to dup it so the 504 // new Parcel now owns its own fd, and can declare that we 505 // officially know we have fds. 506 flat->handle = dup(flat->handle); 507 flat->cookie = 1; 508 mHasFds = mFdsKnown = true; 509 if (!mAllowFds) { 510 err = FDS_NOT_ALLOWED; 511 } 512 } 513 } 514 } 515 516 return err; 517} 518 519bool Parcel::pushAllowFds(bool allowFds) 520{ 521 const bool origValue = mAllowFds; 522 if (!allowFds) { 523 mAllowFds = false; 524 } 525 return origValue; 526} 527 528void Parcel::restoreAllowFds(bool lastValue) 529{ 530 mAllowFds = lastValue; 531} 532 533bool Parcel::hasFileDescriptors() const 534{ 535 if (!mFdsKnown) { 536 scanForFds(); 537 } 538 return mHasFds; 539} 540 541// Write RPC headers. (previously just the interface token) 542status_t Parcel::writeInterfaceToken(const String16& interface) 543{ 544 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 545 STRICT_MODE_PENALTY_GATHER); 546 // currently the interface identification token is just its name as a string 547 return writeString16(interface); 548} 549 550bool Parcel::checkInterface(IBinder* binder) const 551{ 552 return enforceInterface(binder->getInterfaceDescriptor()); 553} 554 555bool Parcel::enforceInterface(const String16& interface, 556 IPCThreadState* threadState) const 557{ 558 int32_t strictPolicy = readInt32(); 559 if (threadState == NULL) { 560 threadState = IPCThreadState::self(); 561 } 562 if ((threadState->getLastTransactionBinderFlags() & 563 IBinder::FLAG_ONEWAY) != 0) { 564 // For one-way calls, the callee is running entirely 565 // disconnected from the caller, so disable StrictMode entirely. 566 // Not only does disk/network usage not impact the caller, but 567 // there's no way to commuicate back any violations anyway. 568 threadState->setStrictModePolicy(0); 569 } else { 570 threadState->setStrictModePolicy(strictPolicy); 571 } 572 const String16 str(readString16()); 573 if (str == interface) { 574 return true; 575 } else { 576 ALOGW("**** enforceInterface() expected '%s' but read '%s'", 577 String8(interface).string(), String8(str).string()); 578 return false; 579 } 580} 581 582const binder_size_t* Parcel::objects() const 583{ 584 return mObjects; 585} 586 587size_t Parcel::objectsCount() const 588{ 589 return mObjectsSize; 590} 591 592status_t Parcel::errorCheck() const 593{ 594 return mError; 595} 596 597void Parcel::setError(status_t err) 598{ 599 mError = err; 600} 601 602status_t Parcel::finishWrite(size_t len) 603{ 604 if (len > INT32_MAX) { 605 // don't accept size_t values which may have come from an 606 // inadvertent conversion from a negative int. 607 return BAD_VALUE; 608 } 609 610 //printf("Finish write of %d\n", len); 611 mDataPos += len; 612 ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos); 613 if (mDataPos > mDataSize) { 614 mDataSize = mDataPos; 615 ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize); 616 } 617 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 618 return NO_ERROR; 619} 620 621status_t Parcel::writeUnpadded(const void* data, size_t len) 622{ 623 if (len > INT32_MAX) { 624 // don't accept size_t values which may have come from an 625 // inadvertent conversion from a negative int. 626 return BAD_VALUE; 627 } 628 629 size_t end = mDataPos + len; 630 if (end < mDataPos) { 631 // integer overflow 632 return BAD_VALUE; 633 } 634 635 if (end <= mDataCapacity) { 636restart_write: 637 memcpy(mData+mDataPos, data, len); 638 return finishWrite(len); 639 } 640 641 status_t err = growData(len); 642 if (err == NO_ERROR) goto restart_write; 643 return err; 644} 645 646status_t Parcel::write(const void* data, size_t len) 647{ 648 if (len > INT32_MAX) { 649 // don't accept size_t values which may have come from an 650 // inadvertent conversion from a negative int. 651 return BAD_VALUE; 652 } 653 654 void* const d = writeInplace(len); 655 if (d) { 656 memcpy(d, data, len); 657 return NO_ERROR; 658 } 659 return mError; 660} 661 662void* Parcel::writeInplace(size_t len) 663{ 664 if (len > INT32_MAX) { 665 // don't accept size_t values which may have come from an 666 // inadvertent conversion from a negative int. 667 return NULL; 668 } 669 670 const size_t padded = pad_size(len); 671 672 // sanity check for integer overflow 673 if (mDataPos+padded < mDataPos) { 674 return NULL; 675 } 676 677 if ((mDataPos+padded) <= mDataCapacity) { 678restart_write: 679 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 680 uint8_t* const data = mData+mDataPos; 681 682 // Need to pad at end? 683 if (padded != len) { 684#if BYTE_ORDER == BIG_ENDIAN 685 static const uint32_t mask[4] = { 686 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 687 }; 688#endif 689#if BYTE_ORDER == LITTLE_ENDIAN 690 static const uint32_t mask[4] = { 691 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 692 }; 693#endif 694 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 695 // *reinterpret_cast<void**>(data+padded-4)); 696 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 697 } 698 699 finishWrite(padded); 700 return data; 701 } 702 703 status_t err = growData(padded); 704 if (err == NO_ERROR) goto restart_write; 705 return NULL; 706} 707 708status_t Parcel::writeInt32(int32_t val) 709{ 710 return writeAligned(val); 711} 712 713status_t Parcel::writeUint32(uint32_t val) 714{ 715 return writeAligned(val); 716} 717 718status_t Parcel::writeInt32Array(size_t len, const int32_t *val) { 719 if (len > INT32_MAX) { 720 // don't accept size_t values which may have come from an 721 // inadvertent conversion from a negative int. 722 return BAD_VALUE; 723 } 724 725 if (!val) { 726 return writeAligned(-1); 727 } 728 status_t ret = writeAligned(len); 729 if (ret == NO_ERROR) { 730 ret = write(val, len * sizeof(*val)); 731 } 732 return ret; 733} 734status_t Parcel::writeByteArray(size_t len, const uint8_t *val) { 735 if (len > INT32_MAX) { 736 // don't accept size_t values which may have come from an 737 // inadvertent conversion from a negative int. 738 return BAD_VALUE; 739 } 740 741 if (!val) { 742 return writeAligned(-1); 743 } 744 status_t ret = writeAligned(len); 745 if (ret == NO_ERROR) { 746 ret = write(val, len * sizeof(*val)); 747 } 748 return ret; 749} 750 751status_t Parcel::writeInt64(int64_t val) 752{ 753 return writeAligned(val); 754} 755 756status_t Parcel::writeUint64(uint64_t val) 757{ 758 return writeAligned(val); 759} 760 761status_t Parcel::writePointer(uintptr_t val) 762{ 763 return writeAligned<binder_uintptr_t>(val); 764} 765 766status_t Parcel::writeFloat(float val) 767{ 768 return writeAligned(val); 769} 770 771#if defined(__mips__) && defined(__mips_hard_float) 772 773status_t Parcel::writeDouble(double val) 774{ 775 union { 776 double d; 777 unsigned long long ll; 778 } u; 779 u.d = val; 780 return writeAligned(u.ll); 781} 782 783#else 784 785status_t Parcel::writeDouble(double val) 786{ 787 return writeAligned(val); 788} 789 790#endif 791 792status_t Parcel::writeCString(const char* str) 793{ 794 return write(str, strlen(str)+1); 795} 796 797status_t Parcel::writeString8(const String8& str) 798{ 799 status_t err = writeInt32(str.bytes()); 800 // only write string if its length is more than zero characters, 801 // as readString8 will only read if the length field is non-zero. 802 // this is slightly different from how writeString16 works. 803 if (str.bytes() > 0 && err == NO_ERROR) { 804 err = write(str.string(), str.bytes()+1); 805 } 806 return err; 807} 808 809status_t Parcel::writeString16(const String16& str) 810{ 811 return writeString16(str.string(), str.size()); 812} 813 814status_t Parcel::writeString16(const char16_t* str, size_t len) 815{ 816 if (str == NULL) return writeInt32(-1); 817 818 status_t err = writeInt32(len); 819 if (err == NO_ERROR) { 820 len *= sizeof(char16_t); 821 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 822 if (data) { 823 memcpy(data, str, len); 824 *reinterpret_cast<char16_t*>(data+len) = 0; 825 return NO_ERROR; 826 } 827 err = mError; 828 } 829 return err; 830} 831 832status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 833{ 834 return flatten_binder(ProcessState::self(), val, this); 835} 836 837status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 838{ 839 return flatten_binder(ProcessState::self(), val, this); 840} 841 842status_t Parcel::writeNativeHandle(const native_handle* handle) 843{ 844 if (!handle || handle->version != sizeof(native_handle)) 845 return BAD_TYPE; 846 847 status_t err; 848 err = writeInt32(handle->numFds); 849 if (err != NO_ERROR) return err; 850 851 err = writeInt32(handle->numInts); 852 if (err != NO_ERROR) return err; 853 854 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 855 err = writeDupFileDescriptor(handle->data[i]); 856 857 if (err != NO_ERROR) { 858 ALOGD("write native handle, write dup fd failed"); 859 return err; 860 } 861 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 862 return err; 863} 864 865status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership) 866{ 867 flat_binder_object obj; 868 obj.type = BINDER_TYPE_FD; 869 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 870 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 871 obj.handle = fd; 872 obj.cookie = takeOwnership ? 1 : 0; 873 return writeObject(obj, true); 874} 875 876status_t Parcel::writeDupFileDescriptor(int fd) 877{ 878 int dupFd = dup(fd); 879 if (dupFd < 0) { 880 return -errno; 881 } 882 status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/); 883 if (err) { 884 close(dupFd); 885 } 886 return err; 887} 888 889status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob) 890{ 891 status_t status; 892 893 if (len > INT32_MAX) { 894 // don't accept size_t values which may have come from an 895 // inadvertent conversion from a negative int. 896 return BAD_VALUE; 897 } 898 899 if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) { 900 ALOGV("writeBlob: write in place"); 901 status = writeInt32(0); 902 if (status) return status; 903 904 void* ptr = writeInplace(len); 905 if (!ptr) return NO_MEMORY; 906 907 outBlob->init(false /*mapped*/, ptr, len); 908 return NO_ERROR; 909 } 910 911 ALOGV("writeBlob: write to ashmem"); 912 int fd = ashmem_create_region("Parcel Blob", len); 913 if (fd < 0) return NO_MEMORY; 914 915 mBlobAshmemSize += len; 916 917 int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); 918 if (result < 0) { 919 status = result; 920 } else { 921 void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 922 if (ptr == MAP_FAILED) { 923 status = -errno; 924 } else { 925 result = ashmem_set_prot_region(fd, PROT_READ); 926 if (result < 0) { 927 status = result; 928 } else { 929 status = writeInt32(1); 930 if (!status) { 931 status = writeFileDescriptor(fd, true /*takeOwnership*/); 932 if (!status) { 933 outBlob->init(true /*mapped*/, ptr, len); 934 return NO_ERROR; 935 } 936 } 937 } 938 } 939 ::munmap(ptr, len); 940 } 941 ::close(fd); 942 return status; 943} 944 945status_t Parcel::write(const FlattenableHelperInterface& val) 946{ 947 status_t err; 948 949 // size if needed 950 const size_t len = val.getFlattenedSize(); 951 const size_t fd_count = val.getFdCount(); 952 953 if ((len > INT32_MAX) || (fd_count > INT32_MAX)) { 954 // don't accept size_t values which may have come from an 955 // inadvertent conversion from a negative int. 956 return BAD_VALUE; 957 } 958 959 err = this->writeInt32(len); 960 if (err) return err; 961 962 err = this->writeInt32(fd_count); 963 if (err) return err; 964 965 // payload 966 void* const buf = this->writeInplace(pad_size(len)); 967 if (buf == NULL) 968 return BAD_VALUE; 969 970 int* fds = NULL; 971 if (fd_count) { 972 fds = new int[fd_count]; 973 } 974 975 err = val.flatten(buf, len, fds, fd_count); 976 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 977 err = this->writeDupFileDescriptor( fds[i] ); 978 } 979 980 if (fd_count) { 981 delete [] fds; 982 } 983 984 return err; 985} 986 987status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 988{ 989 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 990 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 991 if (enoughData && enoughObjects) { 992restart_write: 993 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 994 995 // Need to write meta-data? 996 if (nullMetaData || val.binder != 0) { 997 mObjects[mObjectsSize] = mDataPos; 998 acquire_object(ProcessState::self(), val, this); 999 mObjectsSize++; 1000 } 1001 1002 // remember if it's a file descriptor 1003 if (val.type == BINDER_TYPE_FD) { 1004 if (!mAllowFds) { 1005 return FDS_NOT_ALLOWED; 1006 } 1007 mHasFds = mFdsKnown = true; 1008 } 1009 1010 return finishWrite(sizeof(flat_binder_object)); 1011 } 1012 1013 if (!enoughData) { 1014 const status_t err = growData(sizeof(val)); 1015 if (err != NO_ERROR) return err; 1016 } 1017 if (!enoughObjects) { 1018 size_t newSize = ((mObjectsSize+2)*3)/2; 1019 binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 1020 if (objects == NULL) return NO_MEMORY; 1021 mObjects = objects; 1022 mObjectsCapacity = newSize; 1023 } 1024 1025 goto restart_write; 1026} 1027 1028status_t Parcel::writeNoException() 1029{ 1030 return writeInt32(0); 1031} 1032 1033void Parcel::remove(size_t /*start*/, size_t /*amt*/) 1034{ 1035 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 1036} 1037 1038status_t Parcel::read(void* outData, size_t len) const 1039{ 1040 if (len > INT32_MAX) { 1041 // don't accept size_t values which may have come from an 1042 // inadvertent conversion from a negative int. 1043 return BAD_VALUE; 1044 } 1045 1046 if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize 1047 && len <= pad_size(len)) { 1048 memcpy(outData, mData+mDataPos, len); 1049 mDataPos += pad_size(len); 1050 ALOGV("read Setting data pos of %p to %zu", this, mDataPos); 1051 return NO_ERROR; 1052 } 1053 return NOT_ENOUGH_DATA; 1054} 1055 1056const void* Parcel::readInplace(size_t len) const 1057{ 1058 if (len > INT32_MAX) { 1059 // don't accept size_t values which may have come from an 1060 // inadvertent conversion from a negative int. 1061 return NULL; 1062 } 1063 1064 if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize 1065 && len <= pad_size(len)) { 1066 const void* data = mData+mDataPos; 1067 mDataPos += pad_size(len); 1068 ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos); 1069 return data; 1070 } 1071 return NULL; 1072} 1073 1074template<class T> 1075status_t Parcel::readAligned(T *pArg) const { 1076 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T)); 1077 1078 if ((mDataPos+sizeof(T)) <= mDataSize) { 1079 const void* data = mData+mDataPos; 1080 mDataPos += sizeof(T); 1081 *pArg = *reinterpret_cast<const T*>(data); 1082 return NO_ERROR; 1083 } else { 1084 return NOT_ENOUGH_DATA; 1085 } 1086} 1087 1088template<class T> 1089T Parcel::readAligned() const { 1090 T result; 1091 if (readAligned(&result) != NO_ERROR) { 1092 result = 0; 1093 } 1094 1095 return result; 1096} 1097 1098template<class T> 1099status_t Parcel::writeAligned(T val) { 1100 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T)); 1101 1102 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 1103restart_write: 1104 *reinterpret_cast<T*>(mData+mDataPos) = val; 1105 return finishWrite(sizeof(val)); 1106 } 1107 1108 status_t err = growData(sizeof(val)); 1109 if (err == NO_ERROR) goto restart_write; 1110 return err; 1111} 1112 1113status_t Parcel::readInt32(int32_t *pArg) const 1114{ 1115 return readAligned(pArg); 1116} 1117 1118int32_t Parcel::readInt32() const 1119{ 1120 return readAligned<int32_t>(); 1121} 1122 1123status_t Parcel::readUint32(uint32_t *pArg) const 1124{ 1125 return readAligned(pArg); 1126} 1127 1128uint32_t Parcel::readUint32() const 1129{ 1130 return readAligned<uint32_t>(); 1131} 1132 1133status_t Parcel::readInt64(int64_t *pArg) const 1134{ 1135 return readAligned(pArg); 1136} 1137 1138 1139int64_t Parcel::readInt64() const 1140{ 1141 return readAligned<int64_t>(); 1142} 1143 1144status_t Parcel::readUint64(uint64_t *pArg) const 1145{ 1146 return readAligned(pArg); 1147} 1148 1149uint64_t Parcel::readUint64() const 1150{ 1151 return readAligned<uint64_t>(); 1152} 1153 1154status_t Parcel::readPointer(uintptr_t *pArg) const 1155{ 1156 status_t ret; 1157 binder_uintptr_t ptr; 1158 ret = readAligned(&ptr); 1159 if (!ret) 1160 *pArg = ptr; 1161 return ret; 1162} 1163 1164uintptr_t Parcel::readPointer() const 1165{ 1166 return readAligned<binder_uintptr_t>(); 1167} 1168 1169 1170status_t Parcel::readFloat(float *pArg) const 1171{ 1172 return readAligned(pArg); 1173} 1174 1175 1176float Parcel::readFloat() const 1177{ 1178 return readAligned<float>(); 1179} 1180 1181#if defined(__mips__) && defined(__mips_hard_float) 1182 1183status_t Parcel::readDouble(double *pArg) const 1184{ 1185 union { 1186 double d; 1187 unsigned long long ll; 1188 } u; 1189 u.d = 0; 1190 status_t status; 1191 status = readAligned(&u.ll); 1192 *pArg = u.d; 1193 return status; 1194} 1195 1196double Parcel::readDouble() const 1197{ 1198 union { 1199 double d; 1200 unsigned long long ll; 1201 } u; 1202 u.ll = readAligned<unsigned long long>(); 1203 return u.d; 1204} 1205 1206#else 1207 1208status_t Parcel::readDouble(double *pArg) const 1209{ 1210 return readAligned(pArg); 1211} 1212 1213double Parcel::readDouble() const 1214{ 1215 return readAligned<double>(); 1216} 1217 1218#endif 1219 1220status_t Parcel::readIntPtr(intptr_t *pArg) const 1221{ 1222 return readAligned(pArg); 1223} 1224 1225 1226intptr_t Parcel::readIntPtr() const 1227{ 1228 return readAligned<intptr_t>(); 1229} 1230 1231 1232const char* Parcel::readCString() const 1233{ 1234 const size_t avail = mDataSize-mDataPos; 1235 if (avail > 0) { 1236 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 1237 // is the string's trailing NUL within the parcel's valid bounds? 1238 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 1239 if (eos) { 1240 const size_t len = eos - str; 1241 mDataPos += pad_size(len+1); 1242 ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos); 1243 return str; 1244 } 1245 } 1246 return NULL; 1247} 1248 1249String8 Parcel::readString8() const 1250{ 1251 int32_t size = readInt32(); 1252 // watch for potential int overflow adding 1 for trailing NUL 1253 if (size > 0 && size < INT32_MAX) { 1254 const char* str = (const char*)readInplace(size+1); 1255 if (str) return String8(str, size); 1256 } 1257 return String8(); 1258} 1259 1260String16 Parcel::readString16() const 1261{ 1262 size_t len; 1263 const char16_t* str = readString16Inplace(&len); 1264 if (str) return String16(str, len); 1265 ALOGE("Reading a NULL string not supported here."); 1266 return String16(); 1267} 1268 1269const char16_t* Parcel::readString16Inplace(size_t* outLen) const 1270{ 1271 int32_t size = readInt32(); 1272 // watch for potential int overflow from size+1 1273 if (size >= 0 && size < INT32_MAX) { 1274 *outLen = size; 1275 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 1276 if (str != NULL) { 1277 return str; 1278 } 1279 } 1280 *outLen = 0; 1281 return NULL; 1282} 1283 1284sp<IBinder> Parcel::readStrongBinder() const 1285{ 1286 sp<IBinder> val; 1287 unflatten_binder(ProcessState::self(), *this, &val); 1288 return val; 1289} 1290 1291wp<IBinder> Parcel::readWeakBinder() const 1292{ 1293 wp<IBinder> val; 1294 unflatten_binder(ProcessState::self(), *this, &val); 1295 return val; 1296} 1297 1298int32_t Parcel::readExceptionCode() const 1299{ 1300 int32_t exception_code = readAligned<int32_t>(); 1301 if (exception_code == EX_HAS_REPLY_HEADER) { 1302 int32_t header_start = dataPosition(); 1303 int32_t header_size = readAligned<int32_t>(); 1304 // Skip over fat responses headers. Not used (or propagated) in 1305 // native code 1306 setDataPosition(header_start + header_size); 1307 // And fat response headers are currently only used when there are no 1308 // exceptions, so return no error: 1309 return 0; 1310 } 1311 return exception_code; 1312} 1313 1314native_handle* Parcel::readNativeHandle() const 1315{ 1316 int numFds, numInts; 1317 status_t err; 1318 err = readInt32(&numFds); 1319 if (err != NO_ERROR) return 0; 1320 err = readInt32(&numInts); 1321 if (err != NO_ERROR) return 0; 1322 1323 native_handle* h = native_handle_create(numFds, numInts); 1324 if (!h) { 1325 return 0; 1326 } 1327 1328 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 1329 h->data[i] = dup(readFileDescriptor()); 1330 if (h->data[i] < 0) err = BAD_VALUE; 1331 } 1332 err = read(h->data + numFds, sizeof(int)*numInts); 1333 if (err != NO_ERROR) { 1334 native_handle_close(h); 1335 native_handle_delete(h); 1336 h = 0; 1337 } 1338 return h; 1339} 1340 1341 1342int Parcel::readFileDescriptor() const 1343{ 1344 const flat_binder_object* flat = readObject(true); 1345 if (flat) { 1346 switch (flat->type) { 1347 case BINDER_TYPE_FD: 1348 //ALOGI("Returning file descriptor %ld from parcel %p", flat->handle, this); 1349 return flat->handle; 1350 } 1351 } 1352 return BAD_TYPE; 1353} 1354 1355status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const 1356{ 1357 int32_t useAshmem; 1358 status_t status = readInt32(&useAshmem); 1359 if (status) return status; 1360 1361 if (!useAshmem) { 1362 ALOGV("readBlob: read in place"); 1363 const void* ptr = readInplace(len); 1364 if (!ptr) return BAD_VALUE; 1365 1366 outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len); 1367 return NO_ERROR; 1368 } 1369 1370 ALOGV("readBlob: read from ashmem"); 1371 int fd = readFileDescriptor(); 1372 if (fd == int(BAD_TYPE)) return BAD_VALUE; 1373 1374 void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); 1375 if (ptr == MAP_FAILED) return NO_MEMORY; 1376 1377 outBlob->init(true /*mapped*/, ptr, len); 1378 return NO_ERROR; 1379} 1380 1381status_t Parcel::read(FlattenableHelperInterface& val) const 1382{ 1383 // size 1384 const size_t len = this->readInt32(); 1385 const size_t fd_count = this->readInt32(); 1386 1387 if (len > INT32_MAX) { 1388 // don't accept size_t values which may have come from an 1389 // inadvertent conversion from a negative int. 1390 return BAD_VALUE; 1391 } 1392 1393 // payload 1394 void const* const buf = this->readInplace(pad_size(len)); 1395 if (buf == NULL) 1396 return BAD_VALUE; 1397 1398 int* fds = NULL; 1399 if (fd_count) { 1400 fds = new int[fd_count]; 1401 } 1402 1403 status_t err = NO_ERROR; 1404 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1405 fds[i] = dup(this->readFileDescriptor()); 1406 if (fds[i] < 0) { 1407 err = BAD_VALUE; 1408 ALOGE("dup() failed in Parcel::read, i is %zu, fds[i] is %d, fd_count is %zu, error: %s", 1409 i, fds[i], fd_count, strerror(errno)); 1410 } 1411 } 1412 1413 if (err == NO_ERROR) { 1414 err = val.unflatten(buf, len, fds, fd_count); 1415 } 1416 1417 if (fd_count) { 1418 delete [] fds; 1419 } 1420 1421 return err; 1422} 1423const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1424{ 1425 const size_t DPOS = mDataPos; 1426 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1427 const flat_binder_object* obj 1428 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1429 mDataPos = DPOS + sizeof(flat_binder_object); 1430 if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) { 1431 // When transferring a NULL object, we don't write it into 1432 // the object list, so we don't want to check for it when 1433 // reading. 1434 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1435 return obj; 1436 } 1437 1438 // Ensure that this object is valid... 1439 binder_size_t* const OBJS = mObjects; 1440 const size_t N = mObjectsSize; 1441 size_t opos = mNextObjectHint; 1442 1443 if (N > 0) { 1444 ALOGV("Parcel %p looking for obj at %zu, hint=%zu", 1445 this, DPOS, opos); 1446 1447 // Start at the current hint position, looking for an object at 1448 // the current data position. 1449 if (opos < N) { 1450 while (opos < (N-1) && OBJS[opos] < DPOS) { 1451 opos++; 1452 } 1453 } else { 1454 opos = N-1; 1455 } 1456 if (OBJS[opos] == DPOS) { 1457 // Found it! 1458 ALOGV("Parcel %p found obj %zu at index %zu with forward search", 1459 this, DPOS, opos); 1460 mNextObjectHint = opos+1; 1461 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1462 return obj; 1463 } 1464 1465 // Look backwards for it... 1466 while (opos > 0 && OBJS[opos] > DPOS) { 1467 opos--; 1468 } 1469 if (OBJS[opos] == DPOS) { 1470 // Found it! 1471 ALOGV("Parcel %p found obj %zu at index %zu with backward search", 1472 this, DPOS, opos); 1473 mNextObjectHint = opos+1; 1474 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1475 return obj; 1476 } 1477 } 1478 ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list", 1479 this, DPOS); 1480 } 1481 return NULL; 1482} 1483 1484void Parcel::closeFileDescriptors() 1485{ 1486 size_t i = mObjectsSize; 1487 if (i > 0) { 1488 //ALOGI("Closing file descriptors for %zu objects...", i); 1489 } 1490 while (i > 0) { 1491 i--; 1492 const flat_binder_object* flat 1493 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1494 if (flat->type == BINDER_TYPE_FD) { 1495 //ALOGI("Closing fd: %ld", flat->handle); 1496 close(flat->handle); 1497 } 1498 } 1499} 1500 1501uintptr_t Parcel::ipcData() const 1502{ 1503 return reinterpret_cast<uintptr_t>(mData); 1504} 1505 1506size_t Parcel::ipcDataSize() const 1507{ 1508 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1509} 1510 1511uintptr_t Parcel::ipcObjects() const 1512{ 1513 return reinterpret_cast<uintptr_t>(mObjects); 1514} 1515 1516size_t Parcel::ipcObjectsCount() const 1517{ 1518 return mObjectsSize; 1519} 1520 1521void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1522 const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1523{ 1524 binder_size_t minOffset = 0; 1525 freeDataNoInit(); 1526 mError = NO_ERROR; 1527 mData = const_cast<uint8_t*>(data); 1528 mDataSize = mDataCapacity = dataSize; 1529 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid()); 1530 mDataPos = 0; 1531 ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos); 1532 mObjects = const_cast<binder_size_t*>(objects); 1533 mObjectsSize = mObjectsCapacity = objectsCount; 1534 mNextObjectHint = 0; 1535 mOwner = relFunc; 1536 mOwnerCookie = relCookie; 1537 for (size_t i = 0; i < mObjectsSize; i++) { 1538 binder_size_t offset = mObjects[i]; 1539 if (offset < minOffset) { 1540 ALOGE("%s: bad object offset %" PRIu64 " < %" PRIu64 "\n", 1541 __func__, (uint64_t)offset, (uint64_t)minOffset); 1542 mObjectsSize = 0; 1543 break; 1544 } 1545 minOffset = offset + sizeof(flat_binder_object); 1546 } 1547 scanForFds(); 1548} 1549 1550void Parcel::print(TextOutput& to, uint32_t /*flags*/) const 1551{ 1552 to << "Parcel("; 1553 1554 if (errorCheck() != NO_ERROR) { 1555 const status_t err = errorCheck(); 1556 to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\""; 1557 } else if (dataSize() > 0) { 1558 const uint8_t* DATA = data(); 1559 to << indent << HexDump(DATA, dataSize()) << dedent; 1560 const binder_size_t* OBJS = objects(); 1561 const size_t N = objectsCount(); 1562 for (size_t i=0; i<N; i++) { 1563 const flat_binder_object* flat 1564 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1565 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1566 << TypeCode(flat->type & 0x7f7f7f00) 1567 << " = " << flat->binder; 1568 } 1569 } else { 1570 to << "NULL"; 1571 } 1572 1573 to << ")"; 1574} 1575 1576void Parcel::releaseObjects() 1577{ 1578 const sp<ProcessState> proc(ProcessState::self()); 1579 size_t i = mObjectsSize; 1580 uint8_t* const data = mData; 1581 binder_size_t* const objects = mObjects; 1582 while (i > 0) { 1583 i--; 1584 const flat_binder_object* flat 1585 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1586 release_object(proc, *flat, this); 1587 } 1588} 1589 1590void Parcel::acquireObjects() 1591{ 1592 const sp<ProcessState> proc(ProcessState::self()); 1593 size_t i = mObjectsSize; 1594 uint8_t* const data = mData; 1595 binder_size_t* const objects = mObjects; 1596 while (i > 0) { 1597 i--; 1598 const flat_binder_object* flat 1599 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1600 acquire_object(proc, *flat, this); 1601 } 1602} 1603 1604void Parcel::freeData() 1605{ 1606 freeDataNoInit(); 1607 initState(); 1608} 1609 1610void Parcel::freeDataNoInit() 1611{ 1612 if (mOwner) { 1613 LOG_ALLOC("Parcel %p: freeing other owner data", this); 1614 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1615 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1616 } else { 1617 LOG_ALLOC("Parcel %p: freeing allocated data", this); 1618 releaseObjects(); 1619 if (mData) { 1620 LOG_ALLOC("Parcel %p: freeing with %zu capacity", this, mDataCapacity); 1621 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1622 gParcelGlobalAllocSize -= mDataCapacity; 1623 gParcelGlobalAllocCount--; 1624 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1625 free(mData); 1626 } 1627 if (mObjects) free(mObjects); 1628 } 1629} 1630 1631status_t Parcel::growData(size_t len) 1632{ 1633 if (len > INT32_MAX) { 1634 // don't accept size_t values which may have come from an 1635 // inadvertent conversion from a negative int. 1636 return BAD_VALUE; 1637 } 1638 1639 size_t newSize = ((mDataSize+len)*3)/2; 1640 return (newSize <= mDataSize) 1641 ? (status_t) NO_MEMORY 1642 : continueWrite(newSize); 1643} 1644 1645status_t Parcel::restartWrite(size_t desired) 1646{ 1647 if (desired > INT32_MAX) { 1648 // don't accept size_t values which may have come from an 1649 // inadvertent conversion from a negative int. 1650 return BAD_VALUE; 1651 } 1652 1653 if (mOwner) { 1654 freeData(); 1655 return continueWrite(desired); 1656 } 1657 1658 uint8_t* data = (uint8_t*)realloc(mData, desired); 1659 if (!data && desired > mDataCapacity) { 1660 mError = NO_MEMORY; 1661 return NO_MEMORY; 1662 } 1663 1664 releaseObjects(); 1665 1666 if (data) { 1667 LOG_ALLOC("Parcel %p: restart from %zu to %zu capacity", this, mDataCapacity, desired); 1668 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1669 gParcelGlobalAllocSize += desired; 1670 gParcelGlobalAllocSize -= mDataCapacity; 1671 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1672 mData = data; 1673 mDataCapacity = desired; 1674 } 1675 1676 mDataSize = mDataPos = 0; 1677 ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize); 1678 ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos); 1679 1680 free(mObjects); 1681 mObjects = NULL; 1682 mObjectsSize = mObjectsCapacity = 0; 1683 mNextObjectHint = 0; 1684 mHasFds = false; 1685 mFdsKnown = true; 1686 mAllowFds = true; 1687 1688 return NO_ERROR; 1689} 1690 1691status_t Parcel::continueWrite(size_t desired) 1692{ 1693 if (desired > INT32_MAX) { 1694 // don't accept size_t values which may have come from an 1695 // inadvertent conversion from a negative int. 1696 return BAD_VALUE; 1697 } 1698 1699 // If shrinking, first adjust for any objects that appear 1700 // after the new data size. 1701 size_t objectsSize = mObjectsSize; 1702 if (desired < mDataSize) { 1703 if (desired == 0) { 1704 objectsSize = 0; 1705 } else { 1706 while (objectsSize > 0) { 1707 if (mObjects[objectsSize-1] < desired) 1708 break; 1709 objectsSize--; 1710 } 1711 } 1712 } 1713 1714 if (mOwner) { 1715 // If the size is going to zero, just release the owner's data. 1716 if (desired == 0) { 1717 freeData(); 1718 return NO_ERROR; 1719 } 1720 1721 // If there is a different owner, we need to take 1722 // posession. 1723 uint8_t* data = (uint8_t*)malloc(desired); 1724 if (!data) { 1725 mError = NO_MEMORY; 1726 return NO_MEMORY; 1727 } 1728 binder_size_t* objects = NULL; 1729 1730 if (objectsSize) { 1731 objects = (binder_size_t*)calloc(objectsSize, sizeof(binder_size_t)); 1732 if (!objects) { 1733 free(data); 1734 1735 mError = NO_MEMORY; 1736 return NO_MEMORY; 1737 } 1738 1739 // Little hack to only acquire references on objects 1740 // we will be keeping. 1741 size_t oldObjectsSize = mObjectsSize; 1742 mObjectsSize = objectsSize; 1743 acquireObjects(); 1744 mObjectsSize = oldObjectsSize; 1745 } 1746 1747 if (mData) { 1748 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1749 } 1750 if (objects && mObjects) { 1751 memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t)); 1752 } 1753 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1754 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1755 mOwner = NULL; 1756 1757 LOG_ALLOC("Parcel %p: taking ownership of %zu capacity", this, desired); 1758 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1759 gParcelGlobalAllocSize += desired; 1760 gParcelGlobalAllocCount++; 1761 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1762 1763 mData = data; 1764 mObjects = objects; 1765 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1766 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1767 mDataCapacity = desired; 1768 mObjectsSize = mObjectsCapacity = objectsSize; 1769 mNextObjectHint = 0; 1770 1771 } else if (mData) { 1772 if (objectsSize < mObjectsSize) { 1773 // Need to release refs on any objects we are dropping. 1774 const sp<ProcessState> proc(ProcessState::self()); 1775 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1776 const flat_binder_object* flat 1777 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1778 if (flat->type == BINDER_TYPE_FD) { 1779 // will need to rescan because we may have lopped off the only FDs 1780 mFdsKnown = false; 1781 } 1782 release_object(proc, *flat, this); 1783 } 1784 binder_size_t* objects = 1785 (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t)); 1786 if (objects) { 1787 mObjects = objects; 1788 } 1789 mObjectsSize = objectsSize; 1790 mNextObjectHint = 0; 1791 } 1792 1793 // We own the data, so we can just do a realloc(). 1794 if (desired > mDataCapacity) { 1795 uint8_t* data = (uint8_t*)realloc(mData, desired); 1796 if (data) { 1797 LOG_ALLOC("Parcel %p: continue from %zu to %zu capacity", this, mDataCapacity, 1798 desired); 1799 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1800 gParcelGlobalAllocSize += desired; 1801 gParcelGlobalAllocSize -= mDataCapacity; 1802 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1803 mData = data; 1804 mDataCapacity = desired; 1805 } else if (desired > mDataCapacity) { 1806 mError = NO_MEMORY; 1807 return NO_MEMORY; 1808 } 1809 } else { 1810 if (mDataSize > desired) { 1811 mDataSize = desired; 1812 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1813 } 1814 if (mDataPos > desired) { 1815 mDataPos = desired; 1816 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1817 } 1818 } 1819 1820 } else { 1821 // This is the first data. Easy! 1822 uint8_t* data = (uint8_t*)malloc(desired); 1823 if (!data) { 1824 mError = NO_MEMORY; 1825 return NO_MEMORY; 1826 } 1827 1828 if(!(mDataCapacity == 0 && mObjects == NULL 1829 && mObjectsCapacity == 0)) { 1830 ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired); 1831 } 1832 1833 LOG_ALLOC("Parcel %p: allocating with %zu capacity", this, desired); 1834 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1835 gParcelGlobalAllocSize += desired; 1836 gParcelGlobalAllocCount++; 1837 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1838 1839 mData = data; 1840 mDataSize = mDataPos = 0; 1841 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1842 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1843 mDataCapacity = desired; 1844 } 1845 1846 return NO_ERROR; 1847} 1848 1849void Parcel::initState() 1850{ 1851 LOG_ALLOC("Parcel %p: initState", this); 1852 mError = NO_ERROR; 1853 mData = 0; 1854 mDataSize = 0; 1855 mDataCapacity = 0; 1856 mDataPos = 0; 1857 ALOGV("initState Setting data size of %p to %zu", this, mDataSize); 1858 ALOGV("initState Setting data pos of %p to %zu", this, mDataPos); 1859 mObjects = NULL; 1860 mObjectsSize = 0; 1861 mObjectsCapacity = 0; 1862 mNextObjectHint = 0; 1863 mHasFds = false; 1864 mFdsKnown = true; 1865 mAllowFds = true; 1866 mOwner = NULL; 1867 mBlobAshmemSize = 0; 1868} 1869 1870void Parcel::scanForFds() const 1871{ 1872 bool hasFds = false; 1873 for (size_t i=0; i<mObjectsSize; i++) { 1874 const flat_binder_object* flat 1875 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1876 if (flat->type == BINDER_TYPE_FD) { 1877 hasFds = true; 1878 break; 1879 } 1880 } 1881 mHasFds = hasFds; 1882 mFdsKnown = true; 1883} 1884 1885size_t Parcel::getBlobAshmemSize() const 1886{ 1887 return mBlobAshmemSize; 1888} 1889 1890// --- Parcel::Blob --- 1891 1892Parcel::Blob::Blob() : 1893 mMapped(false), mData(NULL), mSize(0) { 1894} 1895 1896Parcel::Blob::~Blob() { 1897 release(); 1898} 1899 1900void Parcel::Blob::release() { 1901 if (mMapped && mData) { 1902 ::munmap(mData, mSize); 1903 } 1904 clear(); 1905} 1906 1907void Parcel::Blob::init(bool mapped, void* data, size_t size) { 1908 mMapped = mapped; 1909 mData = data; 1910 mSize = size; 1911} 1912 1913void Parcel::Blob::clear() { 1914 mMapped = false; 1915 mData = NULL; 1916 mSize = 0; 1917} 1918 1919}; // namespace android 1920