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 "hw-Parcel" 18 //#define LOG_NDEBUG 0 19 20 #include <errno.h> 21 #include <fcntl.h> 22 #include <inttypes.h> 23 #include <pthread.h> 24 #include <stdint.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <sys/mman.h> 28 #include <sys/stat.h> 29 #include <sys/types.h> 30 #include <sys/resource.h> 31 #include <unistd.h> 32 33 #include <hwbinder/Binder.h> 34 #include <hwbinder/BpHwBinder.h> 35 #include <hwbinder/IPCThreadState.h> 36 #include <hwbinder/Parcel.h> 37 #include <hwbinder/ProcessState.h> 38 #include <hwbinder/TextOutput.h> 39 #include <hwbinder/binder_kernel.h> 40 41 #include <cutils/ashmem.h> 42 #include <utils/Debug.h> 43 #include <utils/Log.h> 44 #include <utils/misc.h> 45 #include <utils/String8.h> 46 #include <utils/String16.h> 47 48 #include <private/binder/binder_module.h> 49 #include <hwbinder/Static.h> 50 51 #ifndef INT32_MAX 52 #define INT32_MAX ((int32_t)(2147483647)) 53 #endif 54 55 #define LOG_REFS(...) 56 //#define LOG_REFS(...) ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__) 57 #define LOG_ALLOC(...) 58 //#define LOG_ALLOC(...) ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__) 59 #define LOG_BUFFER(...) 60 // #define LOG_BUFFER(...) ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__) 61 62 // --------------------------------------------------------------------------- 63 64 // This macro should never be used at runtime, as a too large value 65 // of s could cause an integer overflow. Instead, you should always 66 // use the wrapper function pad_size() 67 #define PAD_SIZE_UNSAFE(s) (((s)+3)&~3) 68 69 static size_t pad_size(size_t s) { 70 if (s > (SIZE_T_MAX - 3)) { 71 abort(); 72 } 73 return PAD_SIZE_UNSAFE(s); 74 } 75 76 // Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 77 #define STRICT_MODE_PENALTY_GATHER (0x40 << 16) 78 79 // XXX This can be made public if we want to provide 80 // support for typed data. 81 struct small_flat_data 82 { 83 uint32_t type; 84 uint32_t data; 85 }; 86 87 namespace android { 88 namespace hardware { 89 90 static pthread_mutex_t gParcelGlobalAllocSizeLock = PTHREAD_MUTEX_INITIALIZER; 91 static size_t gParcelGlobalAllocSize = 0; 92 static size_t gParcelGlobalAllocCount = 0; 93 94 static size_t gMaxFds = 0; 95 96 static const size_t PARCEL_REF_CAP = 1024; 97 98 void acquire_binder_object(const sp<ProcessState>& proc, 99 const flat_binder_object& obj, const void* who) 100 { 101 switch (obj.hdr.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 } 126 127 ALOGD("Invalid object type 0x%08x", obj.hdr.type); 128 } 129 130 void acquire_object(const sp<ProcessState>& proc, const binder_object_header& obj, 131 const void *who) { 132 switch (obj.type) { 133 case BINDER_TYPE_BINDER: 134 case BINDER_TYPE_WEAK_BINDER: 135 case BINDER_TYPE_HANDLE: 136 case BINDER_TYPE_WEAK_HANDLE: { 137 const flat_binder_object& fbo = reinterpret_cast<const flat_binder_object&>(obj); 138 acquire_binder_object(proc, fbo, who); 139 break; 140 } 141 } 142 } 143 144 void release_object(const sp<ProcessState>& proc, 145 const flat_binder_object& obj, const void* who) 146 { 147 switch (obj.hdr.type) { 148 case BINDER_TYPE_BINDER: 149 if (obj.binder) { 150 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 151 reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who); 152 } 153 return; 154 case BINDER_TYPE_WEAK_BINDER: 155 if (obj.binder) 156 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 157 return; 158 case BINDER_TYPE_HANDLE: { 159 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 160 if (b != NULL) { 161 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 162 b->decStrong(who); 163 } 164 return; 165 } 166 case BINDER_TYPE_WEAK_HANDLE: { 167 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 168 if (b != NULL) b.get_refs()->decWeak(who); 169 return; 170 } 171 case BINDER_TYPE_FD: { 172 if (obj.cookie != 0) { // owned 173 close(obj.handle); 174 } 175 return; 176 } 177 case BINDER_TYPE_PTR: { 178 // The relevant buffer is part of the transaction buffer and will be freed that way 179 return; 180 } 181 case BINDER_TYPE_FDA: { 182 // The enclosed file descriptors are closed in the kernel 183 return; 184 } 185 } 186 187 ALOGE("Invalid object type 0x%08x", obj.hdr.type); 188 } 189 190 inline static status_t finish_flatten_binder( 191 const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out) 192 { 193 return out->writeObject(flat); 194 } 195 196 status_t flatten_binder(const sp<ProcessState>& /*proc*/, 197 const sp<IBinder>& binder, Parcel* out) 198 { 199 flat_binder_object obj; 200 201 if (binder != NULL) { 202 BHwBinder *local = binder->localBinder(); 203 if (!local) { 204 BpHwBinder *proxy = binder->remoteBinder(); 205 if (proxy == NULL) { 206 ALOGE("null proxy"); 207 } 208 const int32_t handle = proxy ? proxy->handle() : 0; 209 obj.hdr.type = BINDER_TYPE_HANDLE; 210 obj.flags = FLAT_BINDER_FLAG_ACCEPTS_FDS; 211 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 212 obj.handle = handle; 213 obj.cookie = 0; 214 } else { 215 // Get policy and convert it 216 int policy = local->getMinSchedulingPolicy(); 217 int priority = local->getMinSchedulingPriority(); 218 219 obj.flags = priority & FLAT_BINDER_FLAG_PRIORITY_MASK; 220 obj.flags |= FLAT_BINDER_FLAG_ACCEPTS_FDS | FLAT_BINDER_FLAG_INHERIT_RT; 221 obj.flags |= (policy & 3) << FLAT_BINDER_FLAG_SCHEDPOLICY_SHIFT; 222 obj.hdr.type = BINDER_TYPE_BINDER; 223 obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs()); 224 obj.cookie = reinterpret_cast<uintptr_t>(local); 225 } 226 } else { 227 obj.hdr.type = BINDER_TYPE_BINDER; 228 obj.binder = 0; 229 obj.cookie = 0; 230 } 231 232 return finish_flatten_binder(binder, obj, out); 233 } 234 235 status_t flatten_binder(const sp<ProcessState>& /*proc*/, 236 const wp<IBinder>& binder, Parcel* out) 237 { 238 flat_binder_object obj; 239 240 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 241 if (binder != NULL) { 242 sp<IBinder> real = binder.promote(); 243 if (real != NULL) { 244 IBinder *local = real->localBinder(); 245 if (!local) { 246 BpHwBinder *proxy = real->remoteBinder(); 247 if (proxy == NULL) { 248 ALOGE("null proxy"); 249 } 250 const int32_t handle = proxy ? proxy->handle() : 0; 251 obj.hdr.type = BINDER_TYPE_WEAK_HANDLE; 252 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 253 obj.handle = handle; 254 obj.cookie = 0; 255 } else { 256 obj.hdr.type = BINDER_TYPE_WEAK_BINDER; 257 obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs()); 258 obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get()); 259 } 260 return finish_flatten_binder(real, obj, out); 261 } 262 263 // XXX How to deal? In order to flatten the given binder, 264 // we need to probe it for information, which requires a primary 265 // reference... but we don't have one. 266 // 267 // The OpenBinder implementation uses a dynamic_cast<> here, 268 // but we can't do that with the different reference counting 269 // implementation we are using. 270 ALOGE("Unable to unflatten Binder weak reference!"); 271 obj.hdr.type = BINDER_TYPE_BINDER; 272 obj.binder = 0; 273 obj.cookie = 0; 274 return finish_flatten_binder(NULL, obj, out); 275 276 } else { 277 obj.hdr.type = BINDER_TYPE_BINDER; 278 obj.binder = 0; 279 obj.cookie = 0; 280 return finish_flatten_binder(NULL, obj, out); 281 } 282 } 283 284 inline static status_t finish_unflatten_binder( 285 BpHwBinder* /*proxy*/, const flat_binder_object& /*flat*/, 286 const Parcel& /*in*/) 287 { 288 return NO_ERROR; 289 } 290 291 status_t unflatten_binder(const sp<ProcessState>& proc, 292 const Parcel& in, sp<IBinder>* out) 293 { 294 const flat_binder_object* flat = in.readObject<flat_binder_object>(); 295 296 if (flat) { 297 switch (flat->hdr.type) { 298 case BINDER_TYPE_BINDER: 299 *out = reinterpret_cast<IBinder*>(flat->cookie); 300 return finish_unflatten_binder(NULL, *flat, in); 301 case BINDER_TYPE_HANDLE: 302 *out = proc->getStrongProxyForHandle(flat->handle); 303 return finish_unflatten_binder( 304 static_cast<BpHwBinder*>(out->get()), *flat, in); 305 } 306 } 307 return BAD_TYPE; 308 } 309 310 status_t unflatten_binder(const sp<ProcessState>& proc, 311 const Parcel& in, wp<IBinder>* out) 312 { 313 const flat_binder_object* flat = in.readObject<flat_binder_object>(); 314 315 if (flat) { 316 switch (flat->hdr.type) { 317 case BINDER_TYPE_BINDER: 318 *out = reinterpret_cast<IBinder*>(flat->cookie); 319 return finish_unflatten_binder(NULL, *flat, in); 320 case BINDER_TYPE_WEAK_BINDER: 321 if (flat->binder != 0) { 322 out->set_object_and_refs( 323 reinterpret_cast<IBinder*>(flat->cookie), 324 reinterpret_cast<RefBase::weakref_type*>(flat->binder)); 325 } else { 326 *out = NULL; 327 } 328 return finish_unflatten_binder(NULL, *flat, in); 329 case BINDER_TYPE_HANDLE: 330 case BINDER_TYPE_WEAK_HANDLE: 331 *out = proc->getWeakProxyForHandle(flat->handle); 332 return finish_unflatten_binder( 333 static_cast<BpHwBinder*>(out->unsafe_get()), *flat, in); 334 } 335 } 336 return BAD_TYPE; 337 } 338 339 /* 340 * Return true iff: 341 * 1. obj is indeed a binder_buffer_object (type is BINDER_TYPE_PTR), and 342 * 2. obj does NOT have the flag BINDER_BUFFER_FLAG_REF (it is not a reference, but 343 * an actual buffer.) 344 */ 345 static inline bool isBuffer(const binder_buffer_object& obj) { 346 return obj.hdr.type == BINDER_TYPE_PTR 347 && (obj.flags & BINDER_BUFFER_FLAG_REF) == 0; 348 } 349 350 // --------------------------------------------------------------------------- 351 352 Parcel::Parcel() 353 { 354 LOG_ALLOC("Parcel %p: constructing", this); 355 initState(); 356 } 357 358 Parcel::~Parcel() 359 { 360 freeDataNoInit(); 361 LOG_ALLOC("Parcel %p: destroyed", this); 362 } 363 364 size_t Parcel::getGlobalAllocSize() { 365 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 366 size_t size = gParcelGlobalAllocSize; 367 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 368 return size; 369 } 370 371 size_t Parcel::getGlobalAllocCount() { 372 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 373 size_t count = gParcelGlobalAllocCount; 374 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 375 return count; 376 } 377 378 const uint8_t* Parcel::data() const 379 { 380 return mData; 381 } 382 383 size_t Parcel::dataSize() const 384 { 385 return (mDataSize > mDataPos ? mDataSize : mDataPos); 386 } 387 388 size_t Parcel::dataAvail() const 389 { 390 size_t result = dataSize() - dataPosition(); 391 if (result > INT32_MAX) { 392 abort(); 393 } 394 return result; 395 } 396 397 size_t Parcel::dataPosition() const 398 { 399 return mDataPos; 400 } 401 402 size_t Parcel::dataCapacity() const 403 { 404 return mDataCapacity; 405 } 406 407 status_t Parcel::setDataSize(size_t size) 408 { 409 if (size > 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; 416 err = continueWrite(size); 417 if (err == NO_ERROR) { 418 mDataSize = size; 419 ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize); 420 } 421 return err; 422 } 423 424 void Parcel::setDataPosition(size_t pos) const 425 { 426 if (pos > INT32_MAX) { 427 // don't accept size_t values which may have come from an 428 // inadvertent conversion from a negative int. 429 abort(); 430 } 431 432 mDataPos = pos; 433 mNextObjectHint = 0; 434 } 435 436 status_t Parcel::setDataCapacity(size_t size) 437 { 438 if (size > 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 if (size > mDataCapacity) return continueWrite(size); 445 return NO_ERROR; 446 } 447 448 status_t Parcel::setData(const uint8_t* buffer, size_t len) 449 { 450 if (len > INT32_MAX) { 451 // don't accept size_t values which may have come from an 452 // inadvertent conversion from a negative int. 453 return BAD_VALUE; 454 } 455 456 status_t err = restartWrite(len); 457 if (err == NO_ERROR) { 458 memcpy(const_cast<uint8_t*>(data()), buffer, len); 459 mDataSize = len; 460 mFdsKnown = false; 461 } 462 return err; 463 } 464 465 // Write RPC headers. (previously just the interface token) 466 status_t Parcel::writeInterfaceToken(const char* interface) 467 { 468 // currently the interface identification token is just its name as a string 469 return writeCString(interface); 470 } 471 472 bool Parcel::enforceInterface(const char* interface) const 473 { 474 const char* str = readCString(); 475 if (strcmp(str, interface) == 0) { 476 return true; 477 } else { 478 ALOGW("**** enforceInterface() expected '%s' but read '%s'", 479 String8(interface).string(), String8(str).string()); 480 return false; 481 } 482 } 483 484 const binder_size_t* Parcel::objects() const 485 { 486 return mObjects; 487 } 488 489 size_t Parcel::objectsCount() const 490 { 491 return mObjectsSize; 492 } 493 494 status_t Parcel::errorCheck() const 495 { 496 return mError; 497 } 498 499 void Parcel::setError(status_t err) 500 { 501 mError = err; 502 } 503 504 status_t Parcel::finishWrite(size_t len) 505 { 506 if (len > INT32_MAX) { 507 // don't accept size_t values which may have come from an 508 // inadvertent conversion from a negative int. 509 return BAD_VALUE; 510 } 511 512 //printf("Finish write of %d\n", len); 513 mDataPos += len; 514 ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos); 515 if (mDataPos > mDataSize) { 516 mDataSize = mDataPos; 517 ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize); 518 } 519 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 520 return NO_ERROR; 521 } 522 523 status_t Parcel::writeUnpadded(const void* data, size_t len) 524 { 525 if (len > INT32_MAX) { 526 // don't accept size_t values which may have come from an 527 // inadvertent conversion from a negative int. 528 return BAD_VALUE; 529 } 530 531 size_t end = mDataPos + len; 532 if (end < mDataPos) { 533 // integer overflow 534 return BAD_VALUE; 535 } 536 537 if (end <= mDataCapacity) { 538 restart_write: 539 memcpy(mData+mDataPos, data, len); 540 return finishWrite(len); 541 } 542 543 status_t err = growData(len); 544 if (err == NO_ERROR) goto restart_write; 545 return err; 546 } 547 548 status_t Parcel::write(const void* data, size_t len) 549 { 550 if (len > INT32_MAX) { 551 // don't accept size_t values which may have come from an 552 // inadvertent conversion from a negative int. 553 return BAD_VALUE; 554 } 555 556 void* const d = writeInplace(len); 557 if (d) { 558 memcpy(d, data, len); 559 return NO_ERROR; 560 } 561 return mError; 562 } 563 564 void* Parcel::writeInplace(size_t len) 565 { 566 if (len > INT32_MAX) { 567 // don't accept size_t values which may have come from an 568 // inadvertent conversion from a negative int. 569 return NULL; 570 } 571 572 const size_t padded = pad_size(len); 573 574 // sanity check for integer overflow 575 if (mDataPos+padded < mDataPos) { 576 return NULL; 577 } 578 579 if ((mDataPos+padded) <= mDataCapacity) { 580 restart_write: 581 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 582 uint8_t* const data = mData+mDataPos; 583 584 // Need to pad at end? 585 if (padded != len) { 586 #if BYTE_ORDER == BIG_ENDIAN 587 static const uint32_t mask[4] = { 588 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 589 }; 590 #endif 591 #if BYTE_ORDER == LITTLE_ENDIAN 592 static const uint32_t mask[4] = { 593 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 594 }; 595 #endif 596 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 597 // *reinterpret_cast<void**>(data+padded-4)); 598 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 599 } 600 601 finishWrite(padded); 602 return data; 603 } 604 605 status_t err = growData(padded); 606 if (err == NO_ERROR) goto restart_write; 607 return NULL; 608 } 609 610 status_t Parcel::writeInt8(int8_t val) 611 { 612 return write(&val, sizeof(val)); 613 } 614 615 status_t Parcel::writeUint8(uint8_t val) 616 { 617 return write(&val, sizeof(val)); 618 } 619 620 status_t Parcel::writeInt16(int16_t val) 621 { 622 return write(&val, sizeof(val)); 623 } 624 625 status_t Parcel::writeUint16(uint16_t val) 626 { 627 return write(&val, sizeof(val)); 628 } 629 630 status_t Parcel::writeInt32(int32_t val) 631 { 632 return writeAligned(val); 633 } 634 635 status_t Parcel::writeUint32(uint32_t val) 636 { 637 return writeAligned(val); 638 } 639 640 status_t Parcel::writeBool(bool val) 641 { 642 return writeInt8(int8_t(val)); 643 } 644 status_t Parcel::writeInt64(int64_t val) 645 { 646 return writeAligned(val); 647 } 648 649 status_t Parcel::writeUint64(uint64_t val) 650 { 651 return writeAligned(val); 652 } 653 654 status_t Parcel::writePointer(uintptr_t val) 655 { 656 return writeAligned<binder_uintptr_t>(val); 657 } 658 659 status_t Parcel::writeFloat(float val) 660 { 661 return writeAligned(val); 662 } 663 664 #if defined(__mips__) && defined(__mips_hard_float) 665 666 status_t Parcel::writeDouble(double val) 667 { 668 union { 669 double d; 670 unsigned long long ll; 671 } u; 672 u.d = val; 673 return writeAligned(u.ll); 674 } 675 676 #else 677 678 status_t Parcel::writeDouble(double val) 679 { 680 return writeAligned(val); 681 } 682 683 #endif 684 685 status_t Parcel::writeCString(const char* str) 686 { 687 return write(str, strlen(str)+1); 688 } 689 status_t Parcel::writeString16(const std::unique_ptr<String16>& str) 690 { 691 if (!str) { 692 return writeInt32(-1); 693 } 694 695 return writeString16(*str); 696 } 697 698 status_t Parcel::writeString16(const String16& str) 699 { 700 return writeString16(str.string(), str.size()); 701 } 702 703 status_t Parcel::writeString16(const char16_t* str, size_t len) 704 { 705 if (str == NULL) return writeInt32(-1); 706 707 status_t err = writeInt32(len); 708 if (err == NO_ERROR) { 709 len *= sizeof(char16_t); 710 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 711 if (data) { 712 memcpy(data, str, len); 713 *reinterpret_cast<char16_t*>(data+len) = 0; 714 return NO_ERROR; 715 } 716 err = mError; 717 } 718 return err; 719 } 720 status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 721 { 722 return flatten_binder(ProcessState::self(), val, this); 723 } 724 725 status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 726 { 727 return flatten_binder(ProcessState::self(), val, this); 728 } 729 730 template <typename T> 731 status_t Parcel::writeObject(const T& val) 732 { 733 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 734 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 735 if (enoughData && enoughObjects) { 736 restart_write: 737 *reinterpret_cast<T*>(mData+mDataPos) = val; 738 739 const binder_object_header* hdr = reinterpret_cast<binder_object_header*>(mData+mDataPos); 740 switch (hdr->type) { 741 case BINDER_TYPE_BINDER: 742 case BINDER_TYPE_WEAK_BINDER: 743 case BINDER_TYPE_HANDLE: 744 case BINDER_TYPE_WEAK_HANDLE: { 745 const flat_binder_object *fbo = reinterpret_cast<const flat_binder_object*>(hdr); 746 if (fbo->binder != 0) { 747 mObjects[mObjectsSize++] = mDataPos; 748 acquire_binder_object(ProcessState::self(), *fbo, this); 749 } 750 break; 751 } 752 case BINDER_TYPE_FD: { 753 // remember if it's a file descriptor 754 if (!mAllowFds) { 755 // fail before modifying our object index 756 return FDS_NOT_ALLOWED; 757 } 758 mHasFds = mFdsKnown = true; 759 mObjects[mObjectsSize++] = mDataPos; 760 break; 761 } 762 case BINDER_TYPE_FDA: 763 mObjects[mObjectsSize++] = mDataPos; 764 break; 765 case BINDER_TYPE_PTR: { 766 const binder_buffer_object *buffer_obj = reinterpret_cast< 767 const binder_buffer_object*>(hdr); 768 if ((void *)buffer_obj->buffer != nullptr) { 769 mObjects[mObjectsSize++] = mDataPos; 770 } 771 break; 772 } 773 default: { 774 ALOGE("writeObject: unknown type %d", hdr->type); 775 break; 776 } 777 } 778 return finishWrite(sizeof(val)); 779 } 780 781 if (!enoughData) { 782 const status_t err = growData(sizeof(val)); 783 if (err != NO_ERROR) return err; 784 } 785 if (!enoughObjects) { 786 size_t newSize = ((mObjectsSize+2)*3)/2; 787 if (newSize * sizeof(binder_size_t) < mObjectsSize) return NO_MEMORY; // overflow 788 binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 789 if (objects == NULL) return NO_MEMORY; 790 mObjects = objects; 791 mObjectsCapacity = newSize; 792 } 793 794 goto restart_write; 795 } 796 797 template status_t Parcel::writeObject<flat_binder_object>(const flat_binder_object& val); 798 template status_t Parcel::writeObject<binder_fd_object>(const binder_fd_object& val); 799 template status_t Parcel::writeObject<binder_buffer_object>(const binder_buffer_object& val); 800 template status_t Parcel::writeObject<binder_fd_array_object>(const binder_fd_array_object& val); 801 802 803 // TODO merge duplicated code in writeEmbeddedBuffer, writeEmbeddedReference, and writeEmbeddedNullReference 804 // TODO merge duplicated code in writeBuffer, writeReference, and writeNullReference 805 806 bool Parcel::validateBufferChild(size_t child_buffer_handle, 807 size_t child_offset) const { 808 if (child_buffer_handle >= mObjectsSize) 809 return false; 810 binder_buffer_object *child = reinterpret_cast<binder_buffer_object*> 811 (mData + mObjects[child_buffer_handle]); 812 if (!isBuffer(*child) || child_offset > child->length) { 813 // Parent object not a buffer, or not large enough 814 LOG_BUFFER("writeEmbeddedReference found wierd child. " 815 "child_offset = %zu, child->length = %zu", 816 child_offset, (size_t)child->length); 817 return false; 818 } 819 return true; 820 } 821 822 bool Parcel::validateBufferParent(size_t parent_buffer_handle, 823 size_t parent_offset) const { 824 if (parent_buffer_handle >= mObjectsSize) 825 return false; 826 binder_buffer_object *parent = reinterpret_cast<binder_buffer_object*> 827 (mData + mObjects[parent_buffer_handle]); 828 if (!isBuffer(*parent) || 829 sizeof(binder_uintptr_t) > parent->length || 830 parent_offset > parent->length - sizeof(binder_uintptr_t)) { 831 // Parent object not a buffer, or not large enough 832 return false; 833 } 834 return true; 835 } 836 status_t Parcel::writeEmbeddedBuffer( 837 const void *buffer, size_t length, size_t *handle, 838 size_t parent_buffer_handle, size_t parent_offset) { 839 LOG_BUFFER("writeEmbeddedBuffer(%p, %zu, parent = (%zu, %zu)) -> %zu", 840 buffer, length, parent_buffer_handle, 841 parent_offset, mObjectsSize); 842 binder_buffer_object obj; 843 obj.hdr.type = BINDER_TYPE_PTR; 844 obj.buffer = reinterpret_cast<binder_uintptr_t>(buffer); 845 obj.length = length; 846 obj.flags = BINDER_BUFFER_FLAG_HAS_PARENT; 847 if(!validateBufferParent(parent_buffer_handle, parent_offset)) 848 return BAD_VALUE; 849 obj.parent = parent_buffer_handle; 850 obj.parent_offset = parent_offset; 851 if (handle != nullptr) { 852 // We use an index into mObjects as a handle 853 *handle = mObjectsSize; 854 } 855 return writeObject(obj); 856 } 857 858 status_t Parcel::writeBuffer(const void *buffer, size_t length, size_t *handle) 859 { 860 LOG_BUFFER("writeBuffer(%p, %zu) -> %zu", 861 buffer, length, mObjectsSize); 862 binder_buffer_object obj; 863 obj.hdr.type = BINDER_TYPE_PTR; 864 obj.buffer = reinterpret_cast<binder_uintptr_t>(buffer); 865 obj.length = length; 866 obj.flags = 0; 867 if (handle != nullptr) { 868 // We use an index into mObjects as a handle 869 *handle = mObjectsSize; 870 } 871 return writeObject(obj); 872 } 873 874 status_t Parcel::incrementNumReferences() { 875 ++mNumRef; 876 LOG_BUFFER("incrementNumReferences: %zu", mNumRef); 877 return mNumRef <= PARCEL_REF_CAP ? OK : NO_MEMORY; 878 } 879 880 status_t Parcel::writeReference(size_t *handle, 881 size_t child_buffer_handle, size_t child_offset) { 882 LOG_BUFFER("writeReference(child = (%zu, %zu)) -> %zu", 883 child_buffer_handle, child_offset, 884 mObjectsSize); 885 status_t status = incrementNumReferences(); 886 if (status != OK) 887 return status; 888 binder_buffer_object obj; 889 obj.hdr.type = BINDER_TYPE_PTR; 890 obj.flags = BINDER_BUFFER_FLAG_REF; 891 if (!validateBufferChild(child_buffer_handle, child_offset)) 892 return BAD_VALUE; 893 // The current binder.h does not have child and child_offset names yet. 894 // Use the buffer and length parameters. 895 obj.buffer = child_buffer_handle; 896 obj.length = child_offset; 897 if (handle != nullptr) 898 // We use an index into mObjects as a handle 899 *handle = mObjectsSize; 900 return writeObject(obj); 901 } 902 903 /* Write an object that describes a pointer from parent to child. 904 * Output the handle of that object in the size_t *handle variable. */ 905 status_t Parcel::writeEmbeddedReference(size_t *handle, 906 size_t child_buffer_handle, size_t child_offset, 907 size_t parent_buffer_handle, size_t parent_offset) { 908 LOG_BUFFER("writeEmbeddedReference(child = (%zu, %zu), parent = (%zu, %zu)) -> %zu", 909 child_buffer_handle, child_offset, 910 parent_buffer_handle, parent_offset, 911 mObjectsSize); 912 status_t status = incrementNumReferences(); 913 if (status != OK) 914 return status; 915 binder_buffer_object obj; 916 obj.hdr.type = BINDER_TYPE_PTR; 917 obj.flags = BINDER_BUFFER_FLAG_REF | BINDER_BUFFER_FLAG_HAS_PARENT; 918 if (!validateBufferChild(child_buffer_handle, child_offset)) 919 return BAD_VALUE; 920 // The current binder.h does not have child and child_offset names yet. 921 // Use the buffer and length parameters. 922 obj.buffer = child_buffer_handle; 923 obj.length = child_offset; 924 if(!validateBufferParent(parent_buffer_handle, parent_offset)) 925 return BAD_VALUE; 926 obj.parent = parent_buffer_handle; 927 obj.parent_offset = parent_offset; 928 if (handle != nullptr) { 929 // We use an index into mObjects as a handle 930 *handle = mObjectsSize; 931 } 932 return writeObject(obj); 933 } 934 935 status_t Parcel::writeNullReference(size_t * handle) { 936 LOG_BUFFER("writeNullReference -> %zu", mObjectsSize); 937 status_t status = incrementNumReferences(); 938 if (status != OK) 939 return status; 940 binder_buffer_object obj; 941 obj.hdr.type = BINDER_TYPE_PTR; 942 obj.flags = BINDER_BUFFER_FLAG_REF; 943 if (handle != nullptr) 944 // We use an index into mObjects as a handle 945 *handle = mObjectsSize; 946 return writeObject(obj); 947 } 948 949 status_t Parcel::writeEmbeddedNullReference(size_t * handle, 950 size_t parent_buffer_handle, size_t parent_offset) { 951 LOG_BUFFER("writeEmbeddedNullReference(parent = (%zu, %zu)) -> %zu", 952 parent_buffer_handle, 953 parent_offset, 954 mObjectsSize); 955 status_t status = incrementNumReferences(); 956 if (status != OK) 957 return status; 958 binder_buffer_object obj; 959 obj.hdr.type = BINDER_TYPE_PTR; 960 obj.flags = BINDER_BUFFER_FLAG_REF | BINDER_BUFFER_FLAG_HAS_PARENT; 961 // parent_buffer_handle and parent_offset needs to be checked. 962 if(!validateBufferParent(parent_buffer_handle, parent_offset)) 963 return BAD_VALUE; 964 obj.parent = parent_buffer_handle; 965 obj.parent_offset = parent_offset; 966 if (handle != nullptr) { 967 // We use an index into mObjects as a handle 968 *handle = mObjectsSize; 969 } 970 return writeObject(obj); 971 } 972 973 void Parcel::clearCache() const { 974 LOG_BUFFER("clearing cache."); 975 mBufCachePos = 0; 976 mBufCache.clear(); 977 } 978 979 void Parcel::updateCache() const { 980 if(mBufCachePos == mObjectsSize) 981 return; 982 LOG_BUFFER("updating cache from %zu to %zu", mBufCachePos, mObjectsSize); 983 for(size_t i = mBufCachePos; i < mObjectsSize; i++) { 984 binder_size_t dataPos = mObjects[i]; 985 binder_buffer_object *obj = 986 reinterpret_cast<binder_buffer_object*>(mData+dataPos); 987 if(!isBuffer(*obj)) 988 continue; 989 BufferInfo ifo; 990 ifo.index = i; 991 ifo.buffer = obj->buffer; 992 ifo.bufend = obj->buffer + obj->length; 993 mBufCache.push_back(ifo); 994 } 995 mBufCachePos = mObjectsSize; 996 } 997 998 /* O(n) (n=#buffers) to find a buffer that contains the given addr */ 999 status_t Parcel::findBuffer(const void *ptr, size_t length, bool *found, 1000 size_t *handle, size_t *offset) const { 1001 if(found == nullptr) 1002 return UNKNOWN_ERROR; 1003 updateCache(); 1004 binder_uintptr_t ptrVal = reinterpret_cast<binder_uintptr_t>(ptr); 1005 // true if the pointer is in some buffer, but the length is too big 1006 // so that ptr + length doesn't fit into the buffer. 1007 bool suspectRejectBadPointer = false; 1008 LOG_BUFFER("findBuffer examining %zu objects.", mObjectsSize); 1009 for(auto entry = mBufCache.rbegin(); entry != mBufCache.rend(); ++entry ) { 1010 if(entry->buffer <= ptrVal && ptrVal < entry->bufend) { 1011 // might have found it. 1012 if(ptrVal + length <= entry->bufend) { 1013 *found = true; 1014 if(handle != nullptr) *handle = entry->index; 1015 if(offset != nullptr) *offset = ptrVal - entry->buffer; 1016 LOG_BUFFER(" findBuffer has a match at %zu!", entry->index); 1017 return OK; 1018 } else { 1019 suspectRejectBadPointer = true; 1020 } 1021 } 1022 } 1023 LOG_BUFFER("findBuffer did not find for ptr = %p.", ptr); 1024 *found = false; 1025 return suspectRejectBadPointer ? BAD_VALUE : OK; 1026 } 1027 1028 /* findBuffer with the assumption that ptr = .buffer (so it points to top 1029 * of the buffer, aka offset 0). 1030 * */ 1031 status_t Parcel::quickFindBuffer(const void *ptr, size_t *handle) const { 1032 updateCache(); 1033 binder_uintptr_t ptrVal = reinterpret_cast<binder_uintptr_t>(ptr); 1034 LOG_BUFFER("quickFindBuffer examining %zu objects.", mObjectsSize); 1035 for(auto entry = mBufCache.rbegin(); entry != mBufCache.rend(); ++entry ) { 1036 if(entry->buffer == ptrVal) { 1037 if(handle != nullptr) *handle = entry->index; 1038 return OK; 1039 } 1040 } 1041 LOG_BUFFER("quickFindBuffer did not find for ptr = %p.", ptr); 1042 return NO_INIT; 1043 } 1044 1045 status_t Parcel::writeNativeHandleNoDup(const native_handle_t *handle, 1046 bool embedded, 1047 size_t parent_buffer_handle, 1048 size_t parent_offset) 1049 { 1050 struct binder_fd_array_object fd_array; 1051 size_t buffer_handle; 1052 status_t status = OK; 1053 1054 if (handle == nullptr) { 1055 status = writeUint64(0); 1056 return status; 1057 } 1058 1059 size_t native_handle_size = sizeof(native_handle_t) 1060 + handle->numFds * sizeof(int) + handle->numInts * sizeof(int); 1061 writeUint64(native_handle_size); 1062 1063 if (embedded) { 1064 status = writeEmbeddedBuffer((void*) handle, 1065 native_handle_size, &buffer_handle, 1066 parent_buffer_handle, parent_offset); 1067 } else { 1068 status = writeBuffer((void*) handle, native_handle_size, &buffer_handle); 1069 } 1070 1071 if (status != OK) { 1072 return status; 1073 } 1074 1075 fd_array.hdr.type = BINDER_TYPE_FDA; 1076 fd_array.num_fds = handle->numFds; 1077 fd_array.parent = buffer_handle; 1078 fd_array.parent_offset = offsetof(native_handle_t, data); 1079 1080 return writeObject(fd_array); 1081 } 1082 1083 status_t Parcel::writeNativeHandleNoDup(const native_handle_t *handle) 1084 { 1085 return writeNativeHandleNoDup(handle, false /* embedded */); 1086 } 1087 1088 status_t Parcel::writeEmbeddedNativeHandle(const native_handle_t *handle, 1089 size_t parent_buffer_handle, 1090 size_t parent_offset) 1091 { 1092 return writeNativeHandleNoDup(handle, true /* embedded */, 1093 parent_buffer_handle, parent_offset); 1094 } 1095 1096 void Parcel::remove(size_t /*start*/, size_t /*amt*/) 1097 { 1098 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 1099 } 1100 1101 status_t Parcel::read(void* outData, size_t len) const 1102 { 1103 if (len > INT32_MAX) { 1104 // don't accept size_t values which may have come from an 1105 // inadvertent conversion from a negative int. 1106 return BAD_VALUE; 1107 } 1108 1109 if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize 1110 && len <= pad_size(len)) { 1111 memcpy(outData, mData+mDataPos, len); 1112 mDataPos += pad_size(len); 1113 ALOGV("read Setting data pos of %p to %zu", this, mDataPos); 1114 return NO_ERROR; 1115 } 1116 return NOT_ENOUGH_DATA; 1117 } 1118 1119 const void* Parcel::readInplace(size_t len) const 1120 { 1121 if (len > INT32_MAX) { 1122 // don't accept size_t values which may have come from an 1123 // inadvertent conversion from a negative int. 1124 return NULL; 1125 } 1126 1127 if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize 1128 && len <= pad_size(len)) { 1129 const void* data = mData+mDataPos; 1130 mDataPos += pad_size(len); 1131 ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos); 1132 return data; 1133 } 1134 return NULL; 1135 } 1136 1137 template<class T> 1138 status_t Parcel::readAligned(T *pArg) const { 1139 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T)); 1140 1141 if ((mDataPos+sizeof(T)) <= mDataSize) { 1142 const void* data = mData+mDataPos; 1143 mDataPos += sizeof(T); 1144 *pArg = *reinterpret_cast<const T*>(data); 1145 return NO_ERROR; 1146 } else { 1147 return NOT_ENOUGH_DATA; 1148 } 1149 } 1150 1151 template<class T> 1152 T Parcel::readAligned() const { 1153 T result; 1154 if (readAligned(&result) != NO_ERROR) { 1155 result = 0; 1156 } 1157 1158 return result; 1159 } 1160 1161 template<class T> 1162 status_t Parcel::writeAligned(T val) { 1163 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T)); 1164 1165 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 1166 restart_write: 1167 *reinterpret_cast<T*>(mData+mDataPos) = val; 1168 return finishWrite(sizeof(val)); 1169 } 1170 1171 status_t err = growData(sizeof(val)); 1172 if (err == NO_ERROR) goto restart_write; 1173 return err; 1174 } 1175 1176 status_t Parcel::readInt8(int8_t *pArg) const 1177 { 1178 return read(pArg, sizeof(*pArg)); 1179 } 1180 1181 status_t Parcel::readUint8(uint8_t *pArg) const 1182 { 1183 return read(pArg, sizeof(*pArg)); 1184 } 1185 1186 status_t Parcel::readInt16(int16_t *pArg) const 1187 { 1188 return read(pArg, sizeof(*pArg)); 1189 } 1190 1191 status_t Parcel::readUint16(uint16_t *pArg) const 1192 { 1193 return read(pArg, sizeof(*pArg)); 1194 } 1195 1196 status_t Parcel::readInt32(int32_t *pArg) const 1197 { 1198 return readAligned(pArg); 1199 } 1200 1201 int32_t Parcel::readInt32() const 1202 { 1203 return readAligned<int32_t>(); 1204 } 1205 1206 status_t Parcel::readUint32(uint32_t *pArg) const 1207 { 1208 return readAligned(pArg); 1209 } 1210 1211 uint32_t Parcel::readUint32() const 1212 { 1213 return readAligned<uint32_t>(); 1214 } 1215 1216 status_t Parcel::readInt64(int64_t *pArg) const 1217 { 1218 return readAligned(pArg); 1219 } 1220 1221 int64_t Parcel::readInt64() const 1222 { 1223 return readAligned<int64_t>(); 1224 } 1225 1226 status_t Parcel::readUint64(uint64_t *pArg) const 1227 { 1228 return readAligned(pArg); 1229 } 1230 1231 uint64_t Parcel::readUint64() const 1232 { 1233 return readAligned<uint64_t>(); 1234 } 1235 1236 status_t Parcel::readPointer(uintptr_t *pArg) const 1237 { 1238 status_t ret; 1239 binder_uintptr_t ptr; 1240 ret = readAligned(&ptr); 1241 if (!ret) 1242 *pArg = ptr; 1243 return ret; 1244 } 1245 1246 uintptr_t Parcel::readPointer() const 1247 { 1248 return readAligned<binder_uintptr_t>(); 1249 } 1250 1251 1252 status_t Parcel::readFloat(float *pArg) const 1253 { 1254 return readAligned(pArg); 1255 } 1256 1257 1258 float Parcel::readFloat() const 1259 { 1260 return readAligned<float>(); 1261 } 1262 1263 #if defined(__mips__) && defined(__mips_hard_float) 1264 1265 status_t Parcel::readDouble(double *pArg) const 1266 { 1267 union { 1268 double d; 1269 unsigned long long ll; 1270 } u; 1271 u.d = 0; 1272 status_t status; 1273 status = readAligned(&u.ll); 1274 *pArg = u.d; 1275 return status; 1276 } 1277 1278 double Parcel::readDouble() const 1279 { 1280 union { 1281 double d; 1282 unsigned long long ll; 1283 } u; 1284 u.ll = readAligned<unsigned long long>(); 1285 return u.d; 1286 } 1287 1288 #else 1289 1290 status_t Parcel::readDouble(double *pArg) const 1291 { 1292 return readAligned(pArg); 1293 } 1294 1295 double Parcel::readDouble() const 1296 { 1297 return readAligned<double>(); 1298 } 1299 1300 #endif 1301 1302 status_t Parcel::readBool(bool *pArg) const 1303 { 1304 int8_t tmp; 1305 status_t ret = readInt8(&tmp); 1306 *pArg = (tmp != 0); 1307 return ret; 1308 } 1309 1310 bool Parcel::readBool() const 1311 { 1312 int8_t tmp; 1313 status_t err = readInt8(&tmp); 1314 1315 if (err != OK) { 1316 return 0; 1317 } 1318 1319 return tmp != 0; 1320 } 1321 1322 const char* Parcel::readCString() const 1323 { 1324 const size_t avail = mDataSize-mDataPos; 1325 if (avail > 0) { 1326 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 1327 // is the string's trailing NUL within the parcel's valid bounds? 1328 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 1329 if (eos) { 1330 const size_t len = eos - str; 1331 mDataPos += pad_size(len+1); 1332 ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos); 1333 return str; 1334 } 1335 } 1336 return NULL; 1337 } 1338 String16 Parcel::readString16() const 1339 { 1340 size_t len; 1341 const char16_t* str = readString16Inplace(&len); 1342 if (str) return String16(str, len); 1343 ALOGE("Reading a NULL string not supported here."); 1344 return String16(); 1345 } 1346 1347 status_t Parcel::readString16(std::unique_ptr<String16>* pArg) const 1348 { 1349 const int32_t start = dataPosition(); 1350 int32_t size; 1351 status_t status = readInt32(&size); 1352 pArg->reset(); 1353 1354 if (status != OK || size < 0) { 1355 return status; 1356 } 1357 1358 setDataPosition(start); 1359 pArg->reset(new (std::nothrow) String16()); 1360 1361 status = readString16(pArg->get()); 1362 1363 if (status != OK) { 1364 pArg->reset(); 1365 } 1366 1367 return status; 1368 } 1369 1370 status_t Parcel::readString16(String16* pArg) const 1371 { 1372 size_t len; 1373 const char16_t* str = readString16Inplace(&len); 1374 if (str) { 1375 pArg->setTo(str, len); 1376 return 0; 1377 } else { 1378 *pArg = String16(); 1379 return UNEXPECTED_NULL; 1380 } 1381 } 1382 1383 const char16_t* Parcel::readString16Inplace(size_t* outLen) const 1384 { 1385 int32_t size = readInt32(); 1386 // watch for potential int overflow from size+1 1387 if (size >= 0 && size < INT32_MAX) { 1388 *outLen = size; 1389 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 1390 if (str != NULL) { 1391 return str; 1392 } 1393 } 1394 *outLen = 0; 1395 return NULL; 1396 } 1397 status_t Parcel::readStrongBinder(sp<IBinder>* val) const 1398 { 1399 status_t status = readNullableStrongBinder(val); 1400 if (status == OK && !val->get()) { 1401 status = UNEXPECTED_NULL; 1402 } 1403 return status; 1404 } 1405 1406 status_t Parcel::readNullableStrongBinder(sp<IBinder>* val) const 1407 { 1408 return unflatten_binder(ProcessState::self(), *this, val); 1409 } 1410 1411 sp<IBinder> Parcel::readStrongBinder() const 1412 { 1413 sp<IBinder> val; 1414 // Note that a lot of code in Android reads binders by hand with this 1415 // method, and that code has historically been ok with getting nullptr 1416 // back (while ignoring error codes). 1417 readNullableStrongBinder(&val); 1418 return val; 1419 } 1420 1421 wp<IBinder> Parcel::readWeakBinder() const 1422 { 1423 wp<IBinder> val; 1424 unflatten_binder(ProcessState::self(), *this, &val); 1425 return val; 1426 } 1427 1428 template<typename T> 1429 const T* Parcel::readObject(size_t *objects_offset) const 1430 { 1431 const size_t DPOS = mDataPos; 1432 if (objects_offset != nullptr) { 1433 *objects_offset = 0; 1434 } 1435 1436 if ((DPOS+sizeof(T)) <= mDataSize) { 1437 const T* obj = reinterpret_cast<const T*>(mData+DPOS); 1438 mDataPos = DPOS + sizeof(T); 1439 const binder_object_header *hdr = reinterpret_cast<const binder_object_header*>(obj); 1440 switch (hdr->type) { 1441 case BINDER_TYPE_BINDER: 1442 case BINDER_TYPE_WEAK_BINDER: 1443 case BINDER_TYPE_HANDLE: 1444 case BINDER_TYPE_WEAK_HANDLE: { 1445 const flat_binder_object *flat_obj = 1446 reinterpret_cast<const flat_binder_object*>(hdr); 1447 if (flat_obj->cookie == 0 && flat_obj->binder == 0) { 1448 // When transferring a NULL binder object, we don't write it into 1449 // the object list, so we don't want to check for it when 1450 // reading. 1451 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1452 return obj; 1453 } 1454 break; 1455 } 1456 case BINDER_TYPE_FD: 1457 case BINDER_TYPE_FDA: 1458 // fd (-arrays) must always appear in the meta-data list (eg touched by the kernel) 1459 break; 1460 case BINDER_TYPE_PTR: { 1461 const binder_buffer_object *buffer_obj = 1462 reinterpret_cast<const binder_buffer_object*>(hdr); 1463 if ((void *)buffer_obj->buffer == nullptr) { 1464 // null pointers can be returned directly - they're not written in the 1465 // object list. All non-null buffers must appear in the objects list. 1466 return obj; 1467 } 1468 break; 1469 } 1470 } 1471 // Ensure that this object is valid... 1472 binder_size_t* const OBJS = mObjects; 1473 const size_t N = mObjectsSize; 1474 size_t opos = mNextObjectHint; 1475 1476 if (N > 0) { 1477 ALOGV("Parcel %p looking for obj at %zu, hint=%zu", 1478 this, DPOS, opos); 1479 1480 // Start at the current hint position, looking for an object at 1481 // the current data position. 1482 if (opos < N) { 1483 while (opos < (N-1) && OBJS[opos] < DPOS) { 1484 opos++; 1485 } 1486 } else { 1487 opos = N-1; 1488 } 1489 if (OBJS[opos] == DPOS) { 1490 // Found it! 1491 ALOGV("Parcel %p found obj %zu at index %zu with forward search", 1492 this, DPOS, opos); 1493 mNextObjectHint = opos+1; 1494 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1495 if (objects_offset != nullptr) { 1496 *objects_offset = opos; 1497 } 1498 return obj; 1499 } 1500 1501 // Look backwards for it... 1502 while (opos > 0 && OBJS[opos] > DPOS) { 1503 opos--; 1504 } 1505 if (OBJS[opos] == DPOS) { 1506 // Found it! 1507 ALOGV("Parcel %p found obj %zu at index %zu with backward search", 1508 this, DPOS, opos); 1509 mNextObjectHint = opos+1; 1510 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1511 if (objects_offset != nullptr) { 1512 *objects_offset = opos; 1513 } 1514 return obj; 1515 } 1516 } 1517 ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list", 1518 this, DPOS); 1519 } 1520 return NULL; 1521 } 1522 1523 template const flat_binder_object* Parcel::readObject<flat_binder_object>(size_t *objects_offset) const; 1524 1525 template const binder_fd_object* Parcel::readObject<binder_fd_object>(size_t *objects_offset) const; 1526 1527 template const binder_buffer_object* Parcel::readObject<binder_buffer_object>(size_t *objects_offset) const; 1528 1529 template const binder_fd_array_object* Parcel::readObject<binder_fd_array_object>(size_t *objects_offset) const; 1530 1531 bool Parcel::verifyBufferObject(const binder_buffer_object *buffer_obj, 1532 size_t size, uint32_t flags, size_t parent, 1533 size_t parentOffset) const { 1534 if (buffer_obj->length != size) { 1535 ALOGE("Buffer length %" PRIu64 " does not match expected size %zu.", 1536 static_cast<uint64_t>(buffer_obj->length), size); 1537 return false; 1538 } 1539 1540 if (buffer_obj->flags != flags) { 1541 ALOGE("Buffer flags 0x%02X do not match expected flags 0x%02X.", buffer_obj->flags, flags); 1542 return false; 1543 } 1544 1545 if (flags & BINDER_BUFFER_FLAG_HAS_PARENT) { 1546 if (buffer_obj->parent != parent) { 1547 ALOGE("Buffer parent %" PRIu64 " does not match expected parent %zu.", 1548 static_cast<uint64_t>(buffer_obj->parent), parent); 1549 return false; 1550 } 1551 if (buffer_obj->parent_offset != parentOffset) { 1552 ALOGE("Buffer parent offset %" PRIu64 " does not match expected offset %zu.", 1553 static_cast<uint64_t>(buffer_obj->parent_offset), parentOffset); 1554 return false; 1555 } 1556 } 1557 1558 return true; 1559 } 1560 1561 status_t Parcel::readBuffer(size_t buffer_size, size_t *buffer_handle, 1562 uint32_t flags, size_t parent, size_t parentOffset, 1563 const void **buffer_out) const { 1564 1565 const binder_buffer_object* buffer_obj = readObject<binder_buffer_object>(buffer_handle); 1566 1567 if (buffer_obj == nullptr || !isBuffer(*buffer_obj)) { 1568 return BAD_VALUE; 1569 } 1570 1571 if (!verifyBufferObject(buffer_obj, buffer_size, flags, parent, parentOffset)) { 1572 return BAD_VALUE; 1573 } 1574 1575 // in read side, always use .buffer and .length. 1576 *buffer_out = reinterpret_cast<void*>(buffer_obj->buffer); 1577 1578 return OK; 1579 } 1580 1581 status_t Parcel::readNullableBuffer(size_t buffer_size, size_t *buffer_handle, 1582 const void **buffer_out) const 1583 { 1584 return readBuffer(buffer_size, buffer_handle, 1585 0 /* flags */, 0 /* parent */, 0 /* parentOffset */, 1586 buffer_out); 1587 } 1588 1589 status_t Parcel::readBuffer(size_t buffer_size, size_t *buffer_handle, 1590 const void **buffer_out) const 1591 { 1592 status_t status = readNullableBuffer(buffer_size, buffer_handle, buffer_out); 1593 if (status == OK && *buffer_out == nullptr) { 1594 return UNEXPECTED_NULL; 1595 } 1596 return status; 1597 } 1598 1599 1600 status_t Parcel::readEmbeddedBuffer(size_t buffer_size, 1601 size_t *buffer_handle, 1602 size_t parent_buffer_handle, 1603 size_t parent_offset, 1604 const void **buffer_out) const 1605 { 1606 status_t status = readNullableEmbeddedBuffer(buffer_size, buffer_handle, 1607 parent_buffer_handle, 1608 parent_offset, buffer_out); 1609 if (status == OK && *buffer_out == nullptr) { 1610 return UNEXPECTED_NULL; 1611 } 1612 return status; 1613 } 1614 1615 status_t Parcel::readNullableEmbeddedBuffer(size_t buffer_size, 1616 size_t *buffer_handle, 1617 size_t parent_buffer_handle, 1618 size_t parent_offset, 1619 const void **buffer_out) const 1620 { 1621 return readBuffer(buffer_size, buffer_handle, BINDER_BUFFER_FLAG_HAS_PARENT, 1622 parent_buffer_handle, parent_offset, buffer_out); 1623 } 1624 1625 // isRef if corresponds to a writeReference call, else corresponds to a writeBuffer call. 1626 // see ::android::hardware::writeReferenceToParcel for details. 1627 status_t Parcel::readReference(void const* *bufptr, 1628 size_t *buffer_handle, bool *isRef) const 1629 { 1630 LOG_BUFFER("readReference"); 1631 const binder_buffer_object* buffer_obj = readObject<binder_buffer_object>(); 1632 LOG_BUFFER(" readReference: buf = %p, len = %zu, flags = %x", 1633 (void*)buffer_obj->buffer, (size_t)buffer_obj->length, 1634 (int)buffer_obj->flags); 1635 // TODO need verification here 1636 if (buffer_obj && buffer_obj->hdr.type == BINDER_TYPE_PTR) { 1637 if (buffer_handle != nullptr) { 1638 *buffer_handle = 0; // TODO fix this, as readBuffer would do 1639 } 1640 if(isRef != nullptr) { 1641 *isRef = (buffer_obj->flags & BINDER_BUFFER_FLAG_REF) != 0; 1642 LOG_BUFFER(" readReference: isRef = %d", *isRef); 1643 } 1644 // in read side, always use .buffer and .length. 1645 if(bufptr != nullptr) { 1646 *bufptr = (void*)buffer_obj->buffer; 1647 } 1648 return OK; 1649 } 1650 1651 return BAD_VALUE; 1652 } 1653 1654 // isRef if corresponds to a writeEmbeddedReference call, else corresponds to a writeEmbeddedBuffer call. 1655 // see ::android::hardware::writeEmbeddedReferenceToParcel for details. 1656 status_t Parcel::readEmbeddedReference(void const* *bufptr, 1657 size_t *buffer_handle, 1658 size_t /* parent_buffer_handle */, 1659 size_t /* parent_offset */, 1660 bool *isRef) const 1661 { 1662 // TODO verify parent and offset 1663 LOG_BUFFER("readEmbeddedReference"); 1664 return (readReference(bufptr, buffer_handle, isRef)); 1665 } 1666 1667 status_t Parcel::readEmbeddedNativeHandle(size_t parent_buffer_handle, 1668 size_t parent_offset, 1669 const native_handle_t **handle) const 1670 { 1671 status_t status = readNullableEmbeddedNativeHandle(parent_buffer_handle, parent_offset, handle); 1672 if (status == OK && *handle == nullptr) { 1673 return UNEXPECTED_NULL; 1674 } 1675 return status; 1676 } 1677 1678 status_t Parcel::readNullableNativeHandleNoDup(const native_handle_t **handle, 1679 bool embedded, 1680 size_t parent_buffer_handle, 1681 size_t parent_offset) const 1682 { 1683 status_t status; 1684 uint64_t nativeHandleSize; 1685 size_t fdaParent; 1686 1687 status = readUint64(&nativeHandleSize); 1688 if (status != OK || nativeHandleSize == 0) { 1689 *handle = nullptr; 1690 return status; 1691 } 1692 1693 if (nativeHandleSize < sizeof(native_handle_t)) { 1694 ALOGE("Received a native_handle_t size that was too small."); 1695 return BAD_VALUE; 1696 } 1697 1698 if (embedded) { 1699 status = readNullableEmbeddedBuffer(nativeHandleSize, &fdaParent, 1700 parent_buffer_handle, parent_offset, 1701 reinterpret_cast<const void**>(handle)); 1702 } else { 1703 status = readNullableBuffer(nativeHandleSize, &fdaParent, 1704 reinterpret_cast<const void**>(handle)); 1705 } 1706 1707 if (status != OK) { 1708 return status; 1709 } 1710 1711 const binder_fd_array_object* fd_array_obj = readObject<binder_fd_array_object>(); 1712 1713 if (fd_array_obj == nullptr || fd_array_obj->hdr.type != BINDER_TYPE_FDA) { 1714 ALOGE("Can't find file-descriptor array object."); 1715 return BAD_VALUE; 1716 } 1717 1718 if (static_cast<int>(fd_array_obj->num_fds) != (*handle)->numFds) { 1719 ALOGE("Number of native handles does not match."); 1720 return BAD_VALUE; 1721 } 1722 1723 if (fd_array_obj->parent != fdaParent) { 1724 ALOGE("Parent handle of file-descriptor array not correct."); 1725 return BAD_VALUE; 1726 } 1727 1728 if (fd_array_obj->parent_offset != offsetof(native_handle_t, data)) { 1729 ALOGE("FD array object not properly offset in parent."); 1730 return BAD_VALUE; 1731 } 1732 1733 return OK; 1734 } 1735 1736 status_t Parcel::readNullableEmbeddedNativeHandle(size_t parent_buffer_handle, 1737 size_t parent_offset, 1738 const native_handle_t **handle) const 1739 { 1740 return readNullableNativeHandleNoDup(handle, true /* embedded */, parent_buffer_handle, 1741 parent_offset); 1742 } 1743 1744 status_t Parcel::readNativeHandleNoDup(const native_handle_t **handle) const 1745 { 1746 status_t status = readNullableNativeHandleNoDup(handle); 1747 if (status == OK && *handle == nullptr) { 1748 return UNEXPECTED_NULL; 1749 } 1750 return status; 1751 } 1752 1753 status_t Parcel::readNullableNativeHandleNoDup(const native_handle_t **handle) const 1754 { 1755 return readNullableNativeHandleNoDup(handle, false /* embedded */); 1756 } 1757 1758 void Parcel::closeFileDescriptors() 1759 { 1760 size_t i = mObjectsSize; 1761 if (i > 0) { 1762 //ALOGI("Closing file descriptors for %zu objects...", i); 1763 } 1764 while (i > 0) { 1765 i--; 1766 const flat_binder_object* flat 1767 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1768 if (flat->hdr.type == BINDER_TYPE_FD) { 1769 //ALOGI("Closing fd: %ld", flat->handle); 1770 close(flat->handle); 1771 } 1772 } 1773 } 1774 1775 uintptr_t Parcel::ipcData() const 1776 { 1777 return reinterpret_cast<uintptr_t>(mData); 1778 } 1779 1780 size_t Parcel::ipcDataSize() const 1781 { 1782 return mDataSize > mDataPos ? mDataSize : mDataPos; 1783 } 1784 1785 uintptr_t Parcel::ipcObjects() const 1786 { 1787 return reinterpret_cast<uintptr_t>(mObjects); 1788 } 1789 1790 size_t Parcel::ipcObjectsCount() const 1791 { 1792 return mObjectsSize; 1793 } 1794 1795 #define BUFFER_ALIGNMENT_BYTES 8 1796 size_t Parcel::ipcBufferSize() const 1797 { 1798 size_t totalBuffersSize = 0; 1799 // Add size for BINDER_TYPE_PTR 1800 size_t i = mObjectsSize; 1801 while (i > 0) { 1802 i--; 1803 const binder_buffer_object* buffer 1804 = reinterpret_cast<binder_buffer_object*>(mData+mObjects[i]); 1805 if (isBuffer(*buffer)) { 1806 /* The binder kernel driver requires each buffer to be 8-byte 1807 * aligned */ 1808 size_t alignedSize = (buffer->length + (BUFFER_ALIGNMENT_BYTES - 1)) 1809 & ~(BUFFER_ALIGNMENT_BYTES - 1); 1810 if (alignedSize > SIZE_MAX - totalBuffersSize) { 1811 ALOGE("ipcBuffersSize(): invalid buffer sizes."); 1812 return 0; 1813 } 1814 totalBuffersSize += alignedSize; 1815 } 1816 } 1817 return totalBuffersSize; 1818 } 1819 1820 void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1821 const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1822 { 1823 binder_size_t minOffset = 0; 1824 freeDataNoInit(); 1825 mError = NO_ERROR; 1826 mData = const_cast<uint8_t*>(data); 1827 mDataSize = mDataCapacity = dataSize; 1828 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid()); 1829 mDataPos = 0; 1830 ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos); 1831 mObjects = const_cast<binder_size_t*>(objects); 1832 mObjectsSize = mObjectsCapacity = objectsCount; 1833 mNextObjectHint = 0; 1834 clearCache(); 1835 mNumRef = 0; 1836 mOwner = relFunc; 1837 mOwnerCookie = relCookie; 1838 for (size_t i = 0; i < mObjectsSize; i++) { 1839 binder_size_t offset = mObjects[i]; 1840 if (offset < minOffset) { 1841 ALOGE("%s: bad object offset %" PRIu64 " < %" PRIu64 "\n", 1842 __func__, (uint64_t)offset, (uint64_t)minOffset); 1843 mObjectsSize = 0; 1844 break; 1845 } 1846 minOffset = offset + sizeof(flat_binder_object); 1847 } 1848 scanForFds(); 1849 } 1850 1851 void Parcel::print(TextOutput& to, uint32_t /*flags*/) const 1852 { 1853 to << "Parcel("; 1854 1855 if (errorCheck() != NO_ERROR) { 1856 const status_t err = errorCheck(); 1857 to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\""; 1858 } else if (dataSize() > 0) { 1859 const uint8_t* DATA = data(); 1860 to << indent << HexDump(DATA, dataSize()) << dedent; 1861 const binder_size_t* OBJS = objects(); 1862 const size_t N = objectsCount(); 1863 for (size_t i=0; i<N; i++) { 1864 const flat_binder_object* flat 1865 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1866 if (flat->hdr.type == BINDER_TYPE_PTR) { 1867 const binder_buffer_object* buffer 1868 = reinterpret_cast<const binder_buffer_object*>(DATA+OBJS[i]); 1869 if(isBuffer(*buffer)) { 1870 HexDump bufferDump((const uint8_t*)buffer->buffer, (size_t)buffer->length); 1871 bufferDump.setSingleLineCutoff(0); 1872 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << " (buffer size " << buffer->length << "):"; 1873 to << indent << bufferDump << dedent; 1874 } else { 1875 to << endl << "Object #" << i << " @ " << (void*)OBJS[i]; 1876 } 1877 } else { 1878 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1879 << TypeCode(flat->hdr.type & 0x7f7f7f00) 1880 << " = " << flat->binder; 1881 } 1882 } 1883 } else { 1884 to << "NULL"; 1885 } 1886 1887 to << ")"; 1888 } 1889 1890 void Parcel::releaseObjects() 1891 { 1892 const sp<ProcessState> proc(ProcessState::self()); 1893 size_t i = mObjectsSize; 1894 uint8_t* const data = mData; 1895 binder_size_t* const objects = mObjects; 1896 while (i > 0) { 1897 i--; 1898 const flat_binder_object* flat 1899 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1900 release_object(proc, *flat, this); 1901 } 1902 } 1903 1904 void Parcel::acquireObjects() 1905 { 1906 const sp<ProcessState> proc(ProcessState::self()); 1907 size_t i = mObjectsSize; 1908 uint8_t* const data = mData; 1909 binder_size_t* const objects = mObjects; 1910 while (i > 0) { 1911 i--; 1912 const binder_object_header* flat 1913 = reinterpret_cast<binder_object_header*>(data+objects[i]); 1914 acquire_object(proc, *flat, this); 1915 } 1916 } 1917 1918 void Parcel::freeData() 1919 { 1920 freeDataNoInit(); 1921 initState(); 1922 } 1923 1924 void Parcel::freeDataNoInit() 1925 { 1926 if (mOwner) { 1927 LOG_ALLOC("Parcel %p: freeing other owner data", this); 1928 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1929 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1930 } else { 1931 LOG_ALLOC("Parcel %p: freeing allocated data", this); 1932 releaseObjects(); 1933 if (mData) { 1934 LOG_ALLOC("Parcel %p: freeing with %zu capacity", this, mDataCapacity); 1935 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1936 if (mDataCapacity <= gParcelGlobalAllocSize) { 1937 gParcelGlobalAllocSize = gParcelGlobalAllocSize - mDataCapacity; 1938 } else { 1939 gParcelGlobalAllocSize = 0; 1940 } 1941 if (gParcelGlobalAllocCount > 0) { 1942 gParcelGlobalAllocCount--; 1943 } 1944 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1945 free(mData); 1946 } 1947 if (mObjects) free(mObjects); 1948 } 1949 } 1950 1951 status_t Parcel::growData(size_t len) 1952 { 1953 if (len > INT32_MAX) { 1954 // don't accept size_t values which may have come from an 1955 // inadvertent conversion from a negative int. 1956 return BAD_VALUE; 1957 } 1958 1959 size_t newSize = ((mDataSize+len)*3)/2; 1960 return (newSize <= mDataSize) 1961 ? (status_t) NO_MEMORY 1962 : continueWrite(newSize); 1963 } 1964 1965 status_t Parcel::restartWrite(size_t desired) 1966 { 1967 if (desired > INT32_MAX) { 1968 // don't accept size_t values which may have come from an 1969 // inadvertent conversion from a negative int. 1970 return BAD_VALUE; 1971 } 1972 1973 if (mOwner) { 1974 freeData(); 1975 return continueWrite(desired); 1976 } 1977 1978 uint8_t* data = (uint8_t*)realloc(mData, desired); 1979 if (!data && desired > mDataCapacity) { 1980 mError = NO_MEMORY; 1981 return NO_MEMORY; 1982 } 1983 1984 releaseObjects(); 1985 1986 if (data) { 1987 LOG_ALLOC("Parcel %p: restart from %zu to %zu capacity", this, mDataCapacity, desired); 1988 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1989 gParcelGlobalAllocSize += desired; 1990 gParcelGlobalAllocSize -= mDataCapacity; 1991 if (!mData) { 1992 gParcelGlobalAllocCount++; 1993 } 1994 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1995 mData = data; 1996 mDataCapacity = desired; 1997 } 1998 1999 mDataSize = mDataPos = 0; 2000 ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize); 2001 ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos); 2002 2003 free(mObjects); 2004 mObjects = NULL; 2005 mObjectsSize = mObjectsCapacity = 0; 2006 mNextObjectHint = 0; 2007 mHasFds = false; 2008 clearCache(); 2009 mNumRef = 0; 2010 mFdsKnown = true; 2011 mAllowFds = true; 2012 2013 return NO_ERROR; 2014 } 2015 2016 status_t Parcel::continueWrite(size_t desired) 2017 { 2018 if (desired > INT32_MAX) { 2019 // don't accept size_t values which may have come from an 2020 // inadvertent conversion from a negative int. 2021 return BAD_VALUE; 2022 } 2023 2024 // If shrinking, first adjust for any objects that appear 2025 // after the new data size. 2026 size_t objectsSize = mObjectsSize; 2027 if (desired < mDataSize) { 2028 if (desired == 0) { 2029 objectsSize = 0; 2030 } else { 2031 while (objectsSize > 0) { 2032 if (mObjects[objectsSize-1] < desired) 2033 break; 2034 objectsSize--; 2035 } 2036 } 2037 } 2038 2039 if (mOwner) { 2040 // If the size is going to zero, just release the owner's data. 2041 if (desired == 0) { 2042 freeData(); 2043 return NO_ERROR; 2044 } 2045 2046 // If there is a different owner, we need to take 2047 // posession. 2048 uint8_t* data = (uint8_t*)malloc(desired); 2049 if (!data) { 2050 mError = NO_MEMORY; 2051 return NO_MEMORY; 2052 } 2053 binder_size_t* objects = NULL; 2054 2055 if (objectsSize) { 2056 objects = (binder_size_t*)calloc(objectsSize, sizeof(binder_size_t)); 2057 if (!objects) { 2058 free(data); 2059 2060 mError = NO_MEMORY; 2061 return NO_MEMORY; 2062 } 2063 2064 // Little hack to only acquire references on objects 2065 // we will be keeping. 2066 size_t oldObjectsSize = mObjectsSize; 2067 mObjectsSize = objectsSize; 2068 acquireObjects(); 2069 mObjectsSize = oldObjectsSize; 2070 } 2071 2072 if (mData) { 2073 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 2074 } 2075 if (objects && mObjects) { 2076 memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t)); 2077 } 2078 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 2079 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 2080 mOwner = NULL; 2081 2082 LOG_ALLOC("Parcel %p: taking ownership of %zu capacity", this, desired); 2083 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 2084 gParcelGlobalAllocSize += desired; 2085 gParcelGlobalAllocCount++; 2086 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 2087 2088 mData = data; 2089 mObjects = objects; 2090 mDataSize = (mDataSize < desired) ? mDataSize : desired; 2091 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 2092 mDataCapacity = desired; 2093 mObjectsSize = mObjectsCapacity = objectsSize; 2094 mNextObjectHint = 0; 2095 2096 clearCache(); 2097 } else if (mData) { 2098 if (objectsSize < mObjectsSize) { 2099 // Need to release refs on any objects we are dropping. 2100 const sp<ProcessState> proc(ProcessState::self()); 2101 for (size_t i=objectsSize; i<mObjectsSize; i++) { 2102 const flat_binder_object* flat 2103 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 2104 if (flat->hdr.type == BINDER_TYPE_FD) { 2105 // will need to rescan because we may have lopped off the only FDs 2106 mFdsKnown = false; 2107 } 2108 release_object(proc, *flat, this); 2109 } 2110 binder_size_t* objects = 2111 (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t)); 2112 if (objects) { 2113 mObjects = objects; 2114 } 2115 mObjectsSize = objectsSize; 2116 mNextObjectHint = 0; 2117 2118 clearCache(); 2119 } 2120 2121 // We own the data, so we can just do a realloc(). 2122 if (desired > mDataCapacity) { 2123 uint8_t* data = (uint8_t*)realloc(mData, desired); 2124 if (data) { 2125 LOG_ALLOC("Parcel %p: continue from %zu to %zu capacity", this, mDataCapacity, 2126 desired); 2127 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 2128 gParcelGlobalAllocSize += desired; 2129 gParcelGlobalAllocSize -= mDataCapacity; 2130 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 2131 mData = data; 2132 mDataCapacity = desired; 2133 } else { 2134 mError = NO_MEMORY; 2135 return NO_MEMORY; 2136 } 2137 } else { 2138 if (mDataSize > desired) { 2139 mDataSize = desired; 2140 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 2141 } 2142 if (mDataPos > desired) { 2143 mDataPos = desired; 2144 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 2145 } 2146 } 2147 2148 } else { 2149 // This is the first data. Easy! 2150 uint8_t* data = (uint8_t*)malloc(desired); 2151 if (!data) { 2152 mError = NO_MEMORY; 2153 return NO_MEMORY; 2154 } 2155 2156 if(!(mDataCapacity == 0 && mObjects == NULL 2157 && mObjectsCapacity == 0)) { 2158 ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired); 2159 } 2160 2161 LOG_ALLOC("Parcel %p: allocating with %zu capacity", this, desired); 2162 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 2163 gParcelGlobalAllocSize += desired; 2164 gParcelGlobalAllocCount++; 2165 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 2166 2167 mData = data; 2168 mDataSize = mDataPos = 0; 2169 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 2170 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 2171 mDataCapacity = desired; 2172 } 2173 2174 return NO_ERROR; 2175 } 2176 2177 void Parcel::initState() 2178 { 2179 LOG_ALLOC("Parcel %p: initState", this); 2180 mError = NO_ERROR; 2181 mData = 0; 2182 mDataSize = 0; 2183 mDataCapacity = 0; 2184 mDataPos = 0; 2185 ALOGV("initState Setting data size of %p to %zu", this, mDataSize); 2186 ALOGV("initState Setting data pos of %p to %zu", this, mDataPos); 2187 mObjects = NULL; 2188 mObjectsSize = 0; 2189 mObjectsCapacity = 0; 2190 mNextObjectHint = 0; 2191 mHasFds = false; 2192 mFdsKnown = true; 2193 mAllowFds = true; 2194 mOwner = NULL; 2195 clearCache(); 2196 mNumRef = 0; 2197 2198 // racing multiple init leads only to multiple identical write 2199 if (gMaxFds == 0) { 2200 struct rlimit result; 2201 if (!getrlimit(RLIMIT_NOFILE, &result)) { 2202 gMaxFds = (size_t)result.rlim_cur; 2203 //ALOGI("parcel fd limit set to %zu", gMaxFds); 2204 } else { 2205 ALOGW("Unable to getrlimit: %s", strerror(errno)); 2206 gMaxFds = 1024; 2207 } 2208 } 2209 } 2210 2211 void Parcel::scanForFds() const 2212 { 2213 bool hasFds = false; 2214 for (size_t i=0; i<mObjectsSize; i++) { 2215 const flat_binder_object* flat 2216 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 2217 if (flat->hdr.type == BINDER_TYPE_FD) { 2218 hasFds = true; 2219 break; 2220 } 2221 } 2222 mHasFds = hasFds; 2223 mFdsKnown = true; 2224 } 2225 2226 }; // namespace hardware 2227 }; // namespace android 2228
