patchoat.cc revision 647b1a86f518d8db0331b3d52a96392b7a62504b
1/* 2 * Copyright (C) 2014 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#include "patchoat.h" 17 18#include <stdio.h> 19#include <stdlib.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <unistd.h> 23 24#include <string> 25#include <vector> 26 27#include "base/scoped_flock.h" 28#include "base/stringpiece.h" 29#include "base/stringprintf.h" 30#include "elf_utils.h" 31#include "elf_file.h" 32#include "elf_file_impl.h" 33#include "gc/space/image_space.h" 34#include "image.h" 35#include "instruction_set.h" 36#include "mirror/art_field.h" 37#include "mirror/art_field-inl.h" 38#include "mirror/art_method.h" 39#include "mirror/art_method-inl.h" 40#include "mirror/object.h" 41#include "mirror/object-inl.h" 42#include "mirror/reference.h" 43#include "noop_compiler_callbacks.h" 44#include "offsets.h" 45#include "os.h" 46#include "runtime.h" 47#include "scoped_thread_state_change.h" 48#include "thread.h" 49#include "utils.h" 50 51namespace art { 52 53static InstructionSet ElfISAToInstructionSet(Elf32_Word isa) { 54 switch (isa) { 55 case EM_ARM: 56 return kArm; 57 case EM_AARCH64: 58 return kArm64; 59 case EM_386: 60 return kX86; 61 case EM_X86_64: 62 return kX86_64; 63 case EM_MIPS: 64 return kMips; 65 default: 66 return kNone; 67 } 68} 69 70static bool LocationToFilename(const std::string& location, InstructionSet isa, 71 std::string* filename) { 72 bool has_system = false; 73 bool has_cache = false; 74 // image_location = /system/framework/boot.art 75 // system_image_location = /system/framework/<image_isa>/boot.art 76 std::string system_filename(GetSystemImageFilename(location.c_str(), isa)); 77 if (OS::FileExists(system_filename.c_str())) { 78 has_system = true; 79 } 80 81 bool have_android_data = false; 82 bool dalvik_cache_exists = false; 83 bool is_global_cache = false; 84 std::string dalvik_cache; 85 GetDalvikCache(GetInstructionSetString(isa), false, &dalvik_cache, 86 &have_android_data, &dalvik_cache_exists, &is_global_cache); 87 88 std::string cache_filename; 89 if (have_android_data && dalvik_cache_exists) { 90 // Always set output location even if it does not exist, 91 // so that the caller knows where to create the image. 92 // 93 // image_location = /system/framework/boot.art 94 // *image_filename = /data/dalvik-cache/<image_isa>/boot.art 95 std::string error_msg; 96 if (GetDalvikCacheFilename(location.c_str(), dalvik_cache.c_str(), 97 &cache_filename, &error_msg)) { 98 has_cache = true; 99 } 100 } 101 if (has_system) { 102 *filename = system_filename; 103 return true; 104 } else if (has_cache) { 105 *filename = cache_filename; 106 return true; 107 } else { 108 return false; 109 } 110} 111 112bool PatchOat::Patch(const std::string& image_location, off_t delta, 113 File* output_image, InstructionSet isa, 114 TimingLogger* timings) { 115 CHECK(Runtime::Current() == nullptr); 116 CHECK(output_image != nullptr); 117 CHECK_GE(output_image->Fd(), 0); 118 CHECK(!image_location.empty()) << "image file must have a filename."; 119 CHECK_NE(isa, kNone); 120 121 TimingLogger::ScopedTiming t("Runtime Setup", timings); 122 const char *isa_name = GetInstructionSetString(isa); 123 std::string image_filename; 124 if (!LocationToFilename(image_location, isa, &image_filename)) { 125 LOG(ERROR) << "Unable to find image at location " << image_location; 126 return false; 127 } 128 std::unique_ptr<File> input_image(OS::OpenFileForReading(image_filename.c_str())); 129 if (input_image.get() == nullptr) { 130 LOG(ERROR) << "unable to open input image file at " << image_filename 131 << " for location " << image_location; 132 return false; 133 } 134 int64_t image_len = input_image->GetLength(); 135 if (image_len < 0) { 136 LOG(ERROR) << "Error while getting image length"; 137 return false; 138 } 139 ImageHeader image_header; 140 if (sizeof(image_header) != input_image->Read(reinterpret_cast<char*>(&image_header), 141 sizeof(image_header), 0)) { 142 LOG(ERROR) << "Unable to read image header from image file " << input_image->GetPath(); 143 return false; 144 } 145 146 // Set up the runtime 147 RuntimeOptions options; 148 NoopCompilerCallbacks callbacks; 149 options.push_back(std::make_pair("compilercallbacks", &callbacks)); 150 std::string img = "-Ximage:" + image_location; 151 options.push_back(std::make_pair(img.c_str(), nullptr)); 152 options.push_back(std::make_pair("imageinstructionset", reinterpret_cast<const void*>(isa_name))); 153 if (!Runtime::Create(options, false)) { 154 LOG(ERROR) << "Unable to initialize runtime"; 155 return false; 156 } 157 // Runtime::Create acquired the mutator_lock_ that is normally given away when we Runtime::Start, 158 // give it away now and then switch to a more manageable ScopedObjectAccess. 159 Thread::Current()->TransitionFromRunnableToSuspended(kNative); 160 ScopedObjectAccess soa(Thread::Current()); 161 162 t.NewTiming("Image and oat Patching setup"); 163 // Create the map where we will write the image patches to. 164 std::string error_msg; 165 std::unique_ptr<MemMap> image(MemMap::MapFile(image_len, PROT_READ | PROT_WRITE, MAP_PRIVATE, 166 input_image->Fd(), 0, 167 input_image->GetPath().c_str(), 168 &error_msg)); 169 if (image.get() == nullptr) { 170 LOG(ERROR) << "unable to map image file " << input_image->GetPath() << " : " << error_msg; 171 return false; 172 } 173 gc::space::ImageSpace* ispc = Runtime::Current()->GetHeap()->GetImageSpace(); 174 175 PatchOat p(image.release(), ispc->GetLiveBitmap(), ispc->GetMemMap(), 176 delta, timings); 177 t.NewTiming("Patching files"); 178 if (!p.PatchImage()) { 179 LOG(ERROR) << "Failed to patch image file " << input_image->GetPath(); 180 return false; 181 } 182 183 t.NewTiming("Writing files"); 184 if (!p.WriteImage(output_image)) { 185 return false; 186 } 187 return true; 188} 189 190bool PatchOat::Patch(const File* input_oat, const std::string& image_location, off_t delta, 191 File* output_oat, File* output_image, InstructionSet isa, 192 TimingLogger* timings) { 193 CHECK(Runtime::Current() == nullptr); 194 CHECK(output_image != nullptr); 195 CHECK_GE(output_image->Fd(), 0); 196 CHECK(input_oat != nullptr); 197 CHECK(output_oat != nullptr); 198 CHECK_GE(input_oat->Fd(), 0); 199 CHECK_GE(output_oat->Fd(), 0); 200 CHECK(!image_location.empty()) << "image file must have a filename."; 201 202 TimingLogger::ScopedTiming t("Runtime Setup", timings); 203 204 if (isa == kNone) { 205 Elf32_Ehdr elf_hdr; 206 if (sizeof(elf_hdr) != input_oat->Read(reinterpret_cast<char*>(&elf_hdr), sizeof(elf_hdr), 0)) { 207 LOG(ERROR) << "unable to read elf header"; 208 return false; 209 } 210 isa = ElfISAToInstructionSet(elf_hdr.e_machine); 211 } 212 const char* isa_name = GetInstructionSetString(isa); 213 std::string image_filename; 214 if (!LocationToFilename(image_location, isa, &image_filename)) { 215 LOG(ERROR) << "Unable to find image at location " << image_location; 216 return false; 217 } 218 std::unique_ptr<File> input_image(OS::OpenFileForReading(image_filename.c_str())); 219 if (input_image.get() == nullptr) { 220 LOG(ERROR) << "unable to open input image file at " << image_filename 221 << " for location " << image_location; 222 return false; 223 } 224 int64_t image_len = input_image->GetLength(); 225 if (image_len < 0) { 226 LOG(ERROR) << "Error while getting image length"; 227 return false; 228 } 229 ImageHeader image_header; 230 if (sizeof(image_header) != input_image->Read(reinterpret_cast<char*>(&image_header), 231 sizeof(image_header), 0)) { 232 LOG(ERROR) << "Unable to read image header from image file " << input_image->GetPath(); 233 } 234 235 // Set up the runtime 236 RuntimeOptions options; 237 NoopCompilerCallbacks callbacks; 238 options.push_back(std::make_pair("compilercallbacks", &callbacks)); 239 std::string img = "-Ximage:" + image_location; 240 options.push_back(std::make_pair(img.c_str(), nullptr)); 241 options.push_back(std::make_pair("imageinstructionset", reinterpret_cast<const void*>(isa_name))); 242 if (!Runtime::Create(options, false)) { 243 LOG(ERROR) << "Unable to initialize runtime"; 244 return false; 245 } 246 // Runtime::Create acquired the mutator_lock_ that is normally given away when we Runtime::Start, 247 // give it away now and then switch to a more manageable ScopedObjectAccess. 248 Thread::Current()->TransitionFromRunnableToSuspended(kNative); 249 ScopedObjectAccess soa(Thread::Current()); 250 251 t.NewTiming("Image and oat Patching setup"); 252 // Create the map where we will write the image patches to. 253 std::string error_msg; 254 std::unique_ptr<MemMap> image(MemMap::MapFile(image_len, PROT_READ | PROT_WRITE, MAP_PRIVATE, 255 input_image->Fd(), 0, 256 input_image->GetPath().c_str(), 257 &error_msg)); 258 if (image.get() == nullptr) { 259 LOG(ERROR) << "unable to map image file " << input_image->GetPath() << " : " << error_msg; 260 return false; 261 } 262 gc::space::ImageSpace* ispc = Runtime::Current()->GetHeap()->GetImageSpace(); 263 264 std::unique_ptr<ElfFile> elf(ElfFile::Open(const_cast<File*>(input_oat), 265 PROT_READ | PROT_WRITE, MAP_PRIVATE, &error_msg)); 266 if (elf.get() == nullptr) { 267 LOG(ERROR) << "unable to open oat file " << input_oat->GetPath() << " : " << error_msg; 268 return false; 269 } 270 271 PatchOat p(elf.release(), image.release(), ispc->GetLiveBitmap(), ispc->GetMemMap(), 272 delta, timings); 273 t.NewTiming("Patching files"); 274 if (!p.PatchElf()) { 275 LOG(ERROR) << "Failed to patch oat file " << input_oat->GetPath(); 276 return false; 277 } 278 if (!p.PatchImage()) { 279 LOG(ERROR) << "Failed to patch image file " << input_image->GetPath(); 280 return false; 281 } 282 283 t.NewTiming("Writing files"); 284 if (!p.WriteElf(output_oat)) { 285 return false; 286 } 287 if (!p.WriteImage(output_image)) { 288 return false; 289 } 290 return true; 291} 292 293bool PatchOat::WriteElf(File* out) { 294 TimingLogger::ScopedTiming t("Writing Elf File", timings_); 295 296 CHECK(oat_file_.get() != nullptr); 297 CHECK(out != nullptr); 298 size_t expect = oat_file_->Size(); 299 if (out->WriteFully(reinterpret_cast<char*>(oat_file_->Begin()), expect) && 300 out->SetLength(expect) == 0) { 301 return true; 302 } else { 303 LOG(ERROR) << "Writing to oat file " << out->GetPath() << " failed."; 304 return false; 305 } 306} 307 308bool PatchOat::WriteImage(File* out) { 309 TimingLogger::ScopedTiming t("Writing image File", timings_); 310 std::string error_msg; 311 312 ScopedFlock img_flock; 313 img_flock.Init(out, &error_msg); 314 315 CHECK(image_ != nullptr); 316 CHECK(out != nullptr); 317 size_t expect = image_->Size(); 318 if (out->WriteFully(reinterpret_cast<char*>(image_->Begin()), expect) && 319 out->SetLength(expect) == 0) { 320 return true; 321 } else { 322 LOG(ERROR) << "Writing to image file " << out->GetPath() << " failed."; 323 return false; 324 } 325} 326 327bool PatchOat::PatchImage() { 328 ImageHeader* image_header = reinterpret_cast<ImageHeader*>(image_->Begin()); 329 CHECK_GT(image_->Size(), sizeof(ImageHeader)); 330 // These are the roots from the original file. 331 mirror::Object* img_roots = image_header->GetImageRoots(); 332 image_header->RelocateImage(delta_); 333 334 VisitObject(img_roots); 335 if (!image_header->IsValid()) { 336 LOG(ERROR) << "reloction renders image header invalid"; 337 return false; 338 } 339 340 { 341 TimingLogger::ScopedTiming t("Walk Bitmap", timings_); 342 // Walk the bitmap. 343 WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); 344 bitmap_->Walk(PatchOat::BitmapCallback, this); 345 } 346 return true; 347} 348 349bool PatchOat::InHeap(mirror::Object* o) { 350 uintptr_t begin = reinterpret_cast<uintptr_t>(heap_->Begin()); 351 uintptr_t end = reinterpret_cast<uintptr_t>(heap_->End()); 352 uintptr_t obj = reinterpret_cast<uintptr_t>(o); 353 return o == nullptr || (begin <= obj && obj < end); 354} 355 356void PatchOat::PatchVisitor::operator() (mirror::Object* obj, MemberOffset off, 357 bool is_static_unused) const { 358 mirror::Object* referent = obj->GetFieldObject<mirror::Object, kVerifyNone>(off); 359 DCHECK(patcher_->InHeap(referent)) << "Referent is not in the heap."; 360 mirror::Object* moved_object = patcher_->RelocatedAddressOf(referent); 361 copy_->SetFieldObjectWithoutWriteBarrier<false, true, kVerifyNone>(off, moved_object); 362} 363 364void PatchOat::PatchVisitor::operator() (mirror::Class* cls, mirror::Reference* ref) const { 365 MemberOffset off = mirror::Reference::ReferentOffset(); 366 mirror::Object* referent = ref->GetReferent(); 367 DCHECK(patcher_->InHeap(referent)) << "Referent is not in the heap."; 368 mirror::Object* moved_object = patcher_->RelocatedAddressOf(referent); 369 copy_->SetFieldObjectWithoutWriteBarrier<false, true, kVerifyNone>(off, moved_object); 370} 371 372mirror::Object* PatchOat::RelocatedCopyOf(mirror::Object* obj) { 373 if (obj == nullptr) { 374 return nullptr; 375 } 376 DCHECK_GT(reinterpret_cast<uintptr_t>(obj), reinterpret_cast<uintptr_t>(heap_->Begin())); 377 DCHECK_LT(reinterpret_cast<uintptr_t>(obj), reinterpret_cast<uintptr_t>(heap_->End())); 378 uintptr_t heap_off = 379 reinterpret_cast<uintptr_t>(obj) - reinterpret_cast<uintptr_t>(heap_->Begin()); 380 DCHECK_LT(heap_off, image_->Size()); 381 return reinterpret_cast<mirror::Object*>(image_->Begin() + heap_off); 382} 383 384mirror::Object* PatchOat::RelocatedAddressOf(mirror::Object* obj) { 385 if (obj == nullptr) { 386 return nullptr; 387 } else { 388 return reinterpret_cast<mirror::Object*>(reinterpret_cast<uint8_t*>(obj) + delta_); 389 } 390} 391 392// Called by BitmapCallback 393void PatchOat::VisitObject(mirror::Object* object) { 394 mirror::Object* copy = RelocatedCopyOf(object); 395 CHECK(copy != nullptr); 396 if (kUseBakerOrBrooksReadBarrier) { 397 object->AssertReadBarrierPointer(); 398 if (kUseBrooksReadBarrier) { 399 mirror::Object* moved_to = RelocatedAddressOf(object); 400 copy->SetReadBarrierPointer(moved_to); 401 DCHECK_EQ(copy->GetReadBarrierPointer(), moved_to); 402 } 403 } 404 PatchOat::PatchVisitor visitor(this, copy); 405 object->VisitReferences<true, kVerifyNone>(visitor, visitor); 406 if (object->IsArtMethod<kVerifyNone>()) { 407 FixupMethod(static_cast<mirror::ArtMethod*>(object), 408 static_cast<mirror::ArtMethod*>(copy)); 409 } 410} 411 412void PatchOat::FixupMethod(mirror::ArtMethod* object, mirror::ArtMethod* copy) { 413 // Just update the entry points if it looks like we should. 414 // TODO: sanity check all the pointers' values 415 uintptr_t portable = reinterpret_cast<uintptr_t>( 416 object->GetEntryPointFromPortableCompiledCode<kVerifyNone>()); 417 if (portable != 0) { 418 copy->SetEntryPointFromPortableCompiledCode(reinterpret_cast<void*>(portable + delta_)); 419 } 420 uintptr_t quick= reinterpret_cast<uintptr_t>( 421 object->GetEntryPointFromQuickCompiledCode<kVerifyNone>()); 422 if (quick != 0) { 423 copy->SetEntryPointFromQuickCompiledCode(reinterpret_cast<void*>(quick + delta_)); 424 } 425 uintptr_t interpreter = reinterpret_cast<uintptr_t>( 426 object->GetEntryPointFromInterpreter<kVerifyNone>()); 427 if (interpreter != 0) { 428 copy->SetEntryPointFromInterpreter( 429 reinterpret_cast<mirror::EntryPointFromInterpreter*>(interpreter + delta_)); 430 } 431 432 uintptr_t native_method = reinterpret_cast<uintptr_t>(object->GetNativeMethod()); 433 if (native_method != 0) { 434 copy->SetNativeMethod(reinterpret_cast<void*>(native_method + delta_)); 435 } 436 437 uintptr_t native_gc_map = reinterpret_cast<uintptr_t>(object->GetNativeGcMap()); 438 if (native_gc_map != 0) { 439 copy->SetNativeGcMap(reinterpret_cast<uint8_t*>(native_gc_map + delta_)); 440 } 441} 442 443bool PatchOat::Patch(File* input_oat, off_t delta, File* output_oat, TimingLogger* timings) { 444 CHECK(input_oat != nullptr); 445 CHECK(output_oat != nullptr); 446 CHECK_GE(input_oat->Fd(), 0); 447 CHECK_GE(output_oat->Fd(), 0); 448 TimingLogger::ScopedTiming t("Setup Oat File Patching", timings); 449 450 std::string error_msg; 451 std::unique_ptr<ElfFile> elf(ElfFile::Open(const_cast<File*>(input_oat), 452 PROT_READ | PROT_WRITE, MAP_PRIVATE, &error_msg)); 453 if (elf.get() == nullptr) { 454 LOG(ERROR) << "unable to open oat file " << input_oat->GetPath() << " : " << error_msg; 455 return false; 456 } 457 458 PatchOat p(elf.release(), delta, timings); 459 t.NewTiming("Patch Oat file"); 460 if (!p.PatchElf()) { 461 return false; 462 } 463 464 t.NewTiming("Writing oat file"); 465 if (!p.WriteElf(output_oat)) { 466 return false; 467 } 468 return true; 469} 470 471template <typename ElfFileImpl, typename ptr_t> 472bool PatchOat::CheckOatFile(ElfFileImpl* oat_file) { 473 auto patches_sec = oat_file->FindSectionByName(".oat_patches"); 474 if (patches_sec->sh_type != SHT_OAT_PATCH) { 475 return false; 476 } 477 ptr_t* patches = reinterpret_cast<ptr_t*>(oat_file->Begin() + patches_sec->sh_offset); 478 ptr_t* patches_end = patches + (patches_sec->sh_size / sizeof(ptr_t)); 479 auto oat_data_sec = oat_file->FindSectionByName(".rodata"); 480 auto oat_text_sec = oat_file->FindSectionByName(".text"); 481 if (oat_data_sec == nullptr) { 482 return false; 483 } 484 if (oat_text_sec == nullptr) { 485 return false; 486 } 487 if (oat_text_sec->sh_offset <= oat_data_sec->sh_offset) { 488 return false; 489 } 490 491 for (; patches < patches_end; patches++) { 492 if (oat_text_sec->sh_size <= *patches) { 493 return false; 494 } 495 } 496 497 return true; 498} 499 500template <typename ElfFileImpl> 501bool PatchOat::PatchOatHeader(ElfFileImpl* oat_file) { 502 auto rodata_sec = oat_file->FindSectionByName(".rodata"); 503 if (rodata_sec == nullptr) { 504 return false; 505 } 506 OatHeader* oat_header = reinterpret_cast<OatHeader*>(oat_file->Begin() + rodata_sec->sh_offset); 507 if (!oat_header->IsValid()) { 508 LOG(ERROR) << "Elf file " << oat_file->GetFile().GetPath() << " has an invalid oat header"; 509 return false; 510 } 511 oat_header->RelocateOat(delta_); 512 return true; 513} 514 515bool PatchOat::PatchElf() { 516 if (oat_file_->is_elf64_) 517 return PatchElf<ElfFileImpl64>(oat_file_->GetImpl64()); 518 else 519 return PatchElf<ElfFileImpl32>(oat_file_->GetImpl32()); 520} 521 522template <typename ElfFileImpl> 523bool PatchOat::PatchElf(ElfFileImpl* oat_file) { 524 TimingLogger::ScopedTiming t("Fixup Elf Text Section", timings_); 525 if (!PatchTextSection<ElfFileImpl>(oat_file)) { 526 return false; 527 } 528 529 if (!PatchOatHeader<ElfFileImpl>(oat_file)) { 530 return false; 531 } 532 533 bool need_fixup = false; 534 for (unsigned int i = 0; i < oat_file->GetProgramHeaderNum(); i++) { 535 auto hdr = oat_file->GetProgramHeader(i); 536 if (hdr->p_vaddr != 0 && hdr->p_vaddr != hdr->p_offset) { 537 need_fixup = true; 538 } 539 if (hdr->p_paddr != 0 && hdr->p_paddr != hdr->p_offset) { 540 need_fixup = true; 541 } 542 } 543 if (!need_fixup) { 544 // This was never passed through ElfFixup so all headers/symbols just have their offset as 545 // their addr. Therefore we do not need to update these parts. 546 return true; 547 } 548 549 t.NewTiming("Fixup Elf Headers"); 550 // Fixup Phdr's 551 oat_file->FixupProgramHeaders(delta_); 552 553 t.NewTiming("Fixup Section Headers"); 554 // Fixup Shdr's 555 oat_file->FixupSectionHeaders(delta_); 556 557 t.NewTiming("Fixup Dynamics"); 558 oat_file->FixupDynamic(delta_); 559 560 t.NewTiming("Fixup Elf Symbols"); 561 // Fixup dynsym 562 if (!oat_file->FixupSymbols(delta_, true)) { 563 return false; 564 } 565 // Fixup symtab 566 if (!oat_file->FixupSymbols(delta_, false)) { 567 return false; 568 } 569 570 t.NewTiming("Fixup Debug Sections"); 571 if (!oat_file->FixupDebugSections(delta_)) { 572 return false; 573 } 574 575 return true; 576} 577 578template <typename ElfFileImpl> 579bool PatchOat::PatchTextSection(ElfFileImpl* oat_file) { 580 auto patches_sec = oat_file->FindSectionByName(".oat_patches"); 581 if (patches_sec == nullptr) { 582 LOG(ERROR) << ".oat_patches section not found. Aborting patch"; 583 return false; 584 } 585 if (patches_sec->sh_type != SHT_OAT_PATCH) { 586 LOG(ERROR) << "Unexpected type of .oat_patches"; 587 return false; 588 } 589 590 switch (patches_sec->sh_entsize) { 591 case sizeof(uint32_t): 592 return PatchTextSection<ElfFileImpl, uint32_t>(oat_file); 593 case sizeof(uint64_t): 594 return PatchTextSection<ElfFileImpl, uint64_t>(oat_file); 595 default: 596 LOG(ERROR) << ".oat_patches Entsize of " << patches_sec->sh_entsize << "bits " 597 << "is not valid"; 598 return false; 599 } 600} 601 602template <typename ElfFileImpl, typename patch_loc_t> 603bool PatchOat::PatchTextSection(ElfFileImpl* oat_file) { 604 bool oat_file_valid = CheckOatFile<ElfFileImpl, patch_loc_t>(oat_file); 605 CHECK(oat_file_valid) << "Oat file invalid"; 606 auto patches_sec = oat_file->FindSectionByName(".oat_patches"); 607 patch_loc_t* patches = reinterpret_cast<patch_loc_t*>(oat_file->Begin() + patches_sec->sh_offset); 608 patch_loc_t* patches_end = patches + (patches_sec->sh_size / sizeof(patch_loc_t)); 609 auto oat_text_sec = oat_file->FindSectionByName(".text"); 610 CHECK(oat_text_sec != nullptr); 611 uint8_t* to_patch = oat_file->Begin() + oat_text_sec->sh_offset; 612 uintptr_t to_patch_end = reinterpret_cast<uintptr_t>(to_patch) + oat_text_sec->sh_size; 613 614 for (; patches < patches_end; patches++) { 615 CHECK_LT(*patches, oat_text_sec->sh_size) << "Bad Patch"; 616 uint32_t* patch_loc = reinterpret_cast<uint32_t*>(to_patch + *patches); 617 CHECK_LT(reinterpret_cast<uintptr_t>(patch_loc), to_patch_end); 618 *patch_loc += delta_; 619 } 620 return true; 621} 622 623static int orig_argc; 624static char** orig_argv; 625 626static std::string CommandLine() { 627 std::vector<std::string> command; 628 for (int i = 0; i < orig_argc; ++i) { 629 command.push_back(orig_argv[i]); 630 } 631 return Join(command, ' '); 632} 633 634static void UsageErrorV(const char* fmt, va_list ap) { 635 std::string error; 636 StringAppendV(&error, fmt, ap); 637 LOG(ERROR) << error; 638} 639 640static void UsageError(const char* fmt, ...) { 641 va_list ap; 642 va_start(ap, fmt); 643 UsageErrorV(fmt, ap); 644 va_end(ap); 645} 646 647static void Usage(const char *fmt, ...) NO_RETURN; 648static void Usage(const char *fmt, ...) { 649 va_list ap; 650 va_start(ap, fmt); 651 UsageErrorV(fmt, ap); 652 va_end(ap); 653 654 UsageError("Command: %s", CommandLine().c_str()); 655 UsageError("Usage: patchoat [options]..."); 656 UsageError(""); 657 UsageError(" --instruction-set=<isa>: Specifies the instruction set the patched code is"); 658 UsageError(" compiled for. Required if you use --input-oat-location"); 659 UsageError(""); 660 UsageError(" --input-oat-file=<file.oat>: Specifies the exact filename of the oat file to be"); 661 UsageError(" patched."); 662 UsageError(""); 663 UsageError(" --input-oat-fd=<file-descriptor>: Specifies the file-descriptor of the oat file"); 664 UsageError(" to be patched."); 665 UsageError(""); 666 UsageError(" --input-oat-location=<file.oat>: Specifies the 'location' to read the patched"); 667 UsageError(" oat file from. If used one must also supply the --instruction-set"); 668 UsageError(""); 669 UsageError(" --input-image-location=<file.art>: Specifies the 'location' of the image file to"); 670 UsageError(" be patched. If --instruction-set is not given it will use the instruction set"); 671 UsageError(" extracted from the --input-oat-file."); 672 UsageError(""); 673 UsageError(" --output-oat-file=<file.oat>: Specifies the exact file to write the patched oat"); 674 UsageError(" file to."); 675 UsageError(""); 676 UsageError(" --output-oat-fd=<file-descriptor>: Specifies the file-descriptor to write the"); 677 UsageError(" the patched oat file to."); 678 UsageError(""); 679 UsageError(" --output-image-file=<file.art>: Specifies the exact file to write the patched"); 680 UsageError(" image file to."); 681 UsageError(""); 682 UsageError(" --output-image-fd=<file-descriptor>: Specifies the file-descriptor to write the"); 683 UsageError(" the patched image file to."); 684 UsageError(""); 685 UsageError(" --orig-base-offset=<original-base-offset>: Specify the base offset the input file"); 686 UsageError(" was compiled with. This is needed if one is specifying a --base-offset"); 687 UsageError(""); 688 UsageError(" --base-offset=<new-base-offset>: Specify the base offset we will repatch the"); 689 UsageError(" given files to use. This requires that --orig-base-offset is also given."); 690 UsageError(""); 691 UsageError(" --base-offset-delta=<delta>: Specify the amount to change the old base-offset by."); 692 UsageError(" This value may be negative."); 693 UsageError(""); 694 UsageError(" --patched-image-file=<file.art>: Use the same patch delta as was used to patch"); 695 UsageError(" the given image file."); 696 UsageError(""); 697 UsageError(" --patched-image-location=<file.art>: Use the same patch delta as was used to"); 698 UsageError(" patch the given image location. If used one must also specify the"); 699 UsageError(" --instruction-set flag. It will search for this image in the same way that"); 700 UsageError(" is done when loading one."); 701 UsageError(""); 702 UsageError(" --lock-output: Obtain a flock on output oat file before starting."); 703 UsageError(""); 704 UsageError(" --no-lock-output: Do not attempt to obtain a flock on output oat file."); 705 UsageError(""); 706 UsageError(" --dump-timings: dump out patch timing information"); 707 UsageError(""); 708 UsageError(" --no-dump-timings: do not dump out patch timing information"); 709 UsageError(""); 710 711 exit(EXIT_FAILURE); 712} 713 714static bool ReadBaseDelta(const char* name, off_t* delta, std::string* error_msg) { 715 CHECK(name != nullptr); 716 CHECK(delta != nullptr); 717 std::unique_ptr<File> file; 718 if (OS::FileExists(name)) { 719 file.reset(OS::OpenFileForReading(name)); 720 if (file.get() == nullptr) { 721 *error_msg = "Failed to open file %s for reading"; 722 return false; 723 } 724 } else { 725 *error_msg = "File %s does not exist"; 726 return false; 727 } 728 CHECK(file.get() != nullptr); 729 ImageHeader hdr; 730 if (sizeof(hdr) != file->Read(reinterpret_cast<char*>(&hdr), sizeof(hdr), 0)) { 731 *error_msg = "Failed to read file %s"; 732 return false; 733 } 734 if (!hdr.IsValid()) { 735 *error_msg = "%s does not contain a valid image header."; 736 return false; 737 } 738 *delta = hdr.GetPatchDelta(); 739 return true; 740} 741 742static File* CreateOrOpen(const char* name, bool* created) { 743 if (OS::FileExists(name)) { 744 *created = false; 745 return OS::OpenFileReadWrite(name); 746 } else { 747 *created = true; 748 std::unique_ptr<File> f(OS::CreateEmptyFile(name)); 749 if (f.get() != nullptr) { 750 if (fchmod(f->Fd(), 0644) != 0) { 751 PLOG(ERROR) << "Unable to make " << name << " world readable"; 752 TEMP_FAILURE_RETRY(unlink(name)); 753 return nullptr; 754 } 755 } 756 return f.release(); 757 } 758} 759 760static int patchoat(int argc, char **argv) { 761 InitLogging(argv); 762 const bool debug = kIsDebugBuild; 763 orig_argc = argc; 764 orig_argv = argv; 765 TimingLogger timings("patcher", false, false); 766 767 InitLogging(argv); 768 769 // Skip over the command name. 770 argv++; 771 argc--; 772 773 if (argc == 0) { 774 Usage("No arguments specified"); 775 } 776 777 timings.StartTiming("Patchoat"); 778 779 // cmd line args 780 bool isa_set = false; 781 InstructionSet isa = kNone; 782 std::string input_oat_filename; 783 std::string input_oat_location; 784 int input_oat_fd = -1; 785 bool have_input_oat = false; 786 std::string input_image_location; 787 std::string output_oat_filename; 788 int output_oat_fd = -1; 789 bool have_output_oat = false; 790 std::string output_image_filename; 791 int output_image_fd = -1; 792 bool have_output_image = false; 793 uintptr_t base_offset = 0; 794 bool base_offset_set = false; 795 uintptr_t orig_base_offset = 0; 796 bool orig_base_offset_set = false; 797 off_t base_delta = 0; 798 bool base_delta_set = false; 799 std::string patched_image_filename; 800 std::string patched_image_location; 801 bool dump_timings = kIsDebugBuild; 802 bool lock_output = true; 803 804 for (int i = 0; i < argc; i++) { 805 const StringPiece option(argv[i]); 806 const bool log_options = false; 807 if (log_options) { 808 LOG(INFO) << "patchoat: option[" << i << "]=" << argv[i]; 809 } 810 if (option.starts_with("--instruction-set=")) { 811 isa_set = true; 812 const char* isa_str = option.substr(strlen("--instruction-set=")).data(); 813 isa = GetInstructionSetFromString(isa_str); 814 if (isa == kNone) { 815 Usage("Unknown or invalid instruction set %s", isa_str); 816 } 817 } else if (option.starts_with("--input-oat-location=")) { 818 if (have_input_oat) { 819 Usage("Only one of --input-oat-file, --input-oat-location and --input-oat-fd may be used."); 820 } 821 have_input_oat = true; 822 input_oat_location = option.substr(strlen("--input-oat-location=")).data(); 823 } else if (option.starts_with("--input-oat-file=")) { 824 if (have_input_oat) { 825 Usage("Only one of --input-oat-file, --input-oat-location and --input-oat-fd may be used."); 826 } 827 have_input_oat = true; 828 input_oat_filename = option.substr(strlen("--input-oat-file=")).data(); 829 } else if (option.starts_with("--input-oat-fd=")) { 830 if (have_input_oat) { 831 Usage("Only one of --input-oat-file, --input-oat-location and --input-oat-fd may be used."); 832 } 833 have_input_oat = true; 834 const char* oat_fd_str = option.substr(strlen("--input-oat-fd=")).data(); 835 if (!ParseInt(oat_fd_str, &input_oat_fd)) { 836 Usage("Failed to parse --input-oat-fd argument '%s' as an integer", oat_fd_str); 837 } 838 if (input_oat_fd < 0) { 839 Usage("--input-oat-fd pass a negative value %d", input_oat_fd); 840 } 841 } else if (option.starts_with("--input-image-location=")) { 842 input_image_location = option.substr(strlen("--input-image-location=")).data(); 843 } else if (option.starts_with("--output-oat-file=")) { 844 if (have_output_oat) { 845 Usage("Only one of --output-oat-file, and --output-oat-fd may be used."); 846 } 847 have_output_oat = true; 848 output_oat_filename = option.substr(strlen("--output-oat-file=")).data(); 849 } else if (option.starts_with("--output-oat-fd=")) { 850 if (have_output_oat) { 851 Usage("Only one of --output-oat-file, --output-oat-fd may be used."); 852 } 853 have_output_oat = true; 854 const char* oat_fd_str = option.substr(strlen("--output-oat-fd=")).data(); 855 if (!ParseInt(oat_fd_str, &output_oat_fd)) { 856 Usage("Failed to parse --output-oat-fd argument '%s' as an integer", oat_fd_str); 857 } 858 if (output_oat_fd < 0) { 859 Usage("--output-oat-fd pass a negative value %d", output_oat_fd); 860 } 861 } else if (option.starts_with("--output-image-file=")) { 862 if (have_output_image) { 863 Usage("Only one of --output-image-file, and --output-image-fd may be used."); 864 } 865 have_output_image = true; 866 output_image_filename = option.substr(strlen("--output-image-file=")).data(); 867 } else if (option.starts_with("--output-image-fd=")) { 868 if (have_output_image) { 869 Usage("Only one of --output-image-file, and --output-image-fd may be used."); 870 } 871 have_output_image = true; 872 const char* image_fd_str = option.substr(strlen("--output-image-fd=")).data(); 873 if (!ParseInt(image_fd_str, &output_image_fd)) { 874 Usage("Failed to parse --output-image-fd argument '%s' as an integer", image_fd_str); 875 } 876 if (output_image_fd < 0) { 877 Usage("--output-image-fd pass a negative value %d", output_image_fd); 878 } 879 } else if (option.starts_with("--orig-base-offset=")) { 880 const char* orig_base_offset_str = option.substr(strlen("--orig-base-offset=")).data(); 881 orig_base_offset_set = true; 882 if (!ParseUint(orig_base_offset_str, &orig_base_offset)) { 883 Usage("Failed to parse --orig-base-offset argument '%s' as an uintptr_t", 884 orig_base_offset_str); 885 } 886 } else if (option.starts_with("--base-offset=")) { 887 const char* base_offset_str = option.substr(strlen("--base-offset=")).data(); 888 base_offset_set = true; 889 if (!ParseUint(base_offset_str, &base_offset)) { 890 Usage("Failed to parse --base-offset argument '%s' as an uintptr_t", base_offset_str); 891 } 892 } else if (option.starts_with("--base-offset-delta=")) { 893 const char* base_delta_str = option.substr(strlen("--base-offset-delta=")).data(); 894 base_delta_set = true; 895 if (!ParseInt(base_delta_str, &base_delta)) { 896 Usage("Failed to parse --base-offset-delta argument '%s' as an off_t", base_delta_str); 897 } 898 } else if (option.starts_with("--patched-image-location=")) { 899 patched_image_location = option.substr(strlen("--patched-image-location=")).data(); 900 } else if (option.starts_with("--patched-image-file=")) { 901 patched_image_filename = option.substr(strlen("--patched-image-file=")).data(); 902 } else if (option == "--lock-output") { 903 lock_output = true; 904 } else if (option == "--no-lock-output") { 905 lock_output = false; 906 } else if (option == "--dump-timings") { 907 dump_timings = true; 908 } else if (option == "--no-dump-timings") { 909 dump_timings = false; 910 } else { 911 Usage("Unknown argument %s", option.data()); 912 } 913 } 914 915 { 916 // Only 1 of these may be set. 917 uint32_t cnt = 0; 918 cnt += (base_delta_set) ? 1 : 0; 919 cnt += (base_offset_set && orig_base_offset_set) ? 1 : 0; 920 cnt += (!patched_image_filename.empty()) ? 1 : 0; 921 cnt += (!patched_image_location.empty()) ? 1 : 0; 922 if (cnt > 1) { 923 Usage("Only one of --base-offset/--orig-base-offset, --base-offset-delta, " 924 "--patched-image-filename or --patched-image-location may be used."); 925 } else if (cnt == 0) { 926 Usage("Must specify --base-offset-delta, --base-offset and --orig-base-offset, " 927 "--patched-image-location or --patched-image-file"); 928 } 929 } 930 931 if (have_input_oat != have_output_oat) { 932 Usage("Either both input and output oat must be supplied or niether must be."); 933 } 934 935 if ((!input_image_location.empty()) != have_output_image) { 936 Usage("Either both input and output image must be supplied or niether must be."); 937 } 938 939 // We know we have both the input and output so rename for clarity. 940 bool have_image_files = have_output_image; 941 bool have_oat_files = have_output_oat; 942 943 if (!have_oat_files && !have_image_files) { 944 Usage("Must be patching either an oat or an image file or both."); 945 } 946 947 if (!have_oat_files && !isa_set) { 948 Usage("Must include ISA if patching an image file without an oat file."); 949 } 950 951 if (!input_oat_location.empty()) { 952 if (!isa_set) { 953 Usage("specifying a location requires specifying an instruction set"); 954 } 955 if (!LocationToFilename(input_oat_location, isa, &input_oat_filename)) { 956 Usage("Unable to find filename for input oat location %s", input_oat_location.c_str()); 957 } 958 if (debug) { 959 LOG(INFO) << "Using input-oat-file " << input_oat_filename; 960 } 961 } 962 if (!patched_image_location.empty()) { 963 if (!isa_set) { 964 Usage("specifying a location requires specifying an instruction set"); 965 } 966 std::string system_filename; 967 bool has_system = false; 968 std::string cache_filename; 969 bool has_cache = false; 970 bool has_android_data_unused = false; 971 bool is_global_cache = false; 972 if (!gc::space::ImageSpace::FindImageFilename(patched_image_location.c_str(), isa, 973 &system_filename, &has_system, &cache_filename, 974 &has_android_data_unused, &has_cache, 975 &is_global_cache)) { 976 Usage("Unable to determine image file for location %s", patched_image_location.c_str()); 977 } 978 if (has_cache) { 979 patched_image_filename = cache_filename; 980 } else if (has_system) { 981 LOG(WARNING) << "Only image file found was in /system for image location " 982 << patched_image_location; 983 patched_image_filename = system_filename; 984 } else { 985 Usage("Unable to determine image file for location %s", patched_image_location.c_str()); 986 } 987 if (debug) { 988 LOG(INFO) << "Using patched-image-file " << patched_image_filename; 989 } 990 } 991 992 if (!base_delta_set) { 993 if (orig_base_offset_set && base_offset_set) { 994 base_delta_set = true; 995 base_delta = base_offset - orig_base_offset; 996 } else if (!patched_image_filename.empty()) { 997 base_delta_set = true; 998 std::string error_msg; 999 if (!ReadBaseDelta(patched_image_filename.c_str(), &base_delta, &error_msg)) { 1000 Usage(error_msg.c_str(), patched_image_filename.c_str()); 1001 } 1002 } else { 1003 if (base_offset_set) { 1004 Usage("Unable to determine original base offset."); 1005 } else { 1006 Usage("Must supply a desired new offset or delta."); 1007 } 1008 } 1009 } 1010 1011 if (!IsAligned<kPageSize>(base_delta)) { 1012 Usage("Base offset/delta must be alligned to a pagesize (0x%08x) boundary.", kPageSize); 1013 } 1014 1015 // Do we need to cleanup output files if we fail? 1016 bool new_image_out = false; 1017 bool new_oat_out = false; 1018 1019 std::unique_ptr<File> input_oat; 1020 std::unique_ptr<File> output_oat; 1021 std::unique_ptr<File> output_image; 1022 1023 if (have_image_files) { 1024 CHECK(!input_image_location.empty()); 1025 1026 if (output_image_fd != -1) { 1027 if (output_image_filename.empty()) { 1028 output_image_filename = "output-image-file"; 1029 } 1030 output_image.reset(new File(output_image_fd, output_image_filename)); 1031 } else { 1032 CHECK(!output_image_filename.empty()); 1033 output_image.reset(CreateOrOpen(output_image_filename.c_str(), &new_image_out)); 1034 } 1035 } else { 1036 CHECK(output_image_filename.empty() && output_image_fd == -1 && input_image_location.empty()); 1037 } 1038 1039 if (have_oat_files) { 1040 if (input_oat_fd != -1) { 1041 if (input_oat_filename.empty()) { 1042 input_oat_filename = "input-oat-file"; 1043 } 1044 input_oat.reset(new File(input_oat_fd, input_oat_filename)); 1045 } else { 1046 CHECK(!input_oat_filename.empty()); 1047 input_oat.reset(OS::OpenFileForReading(input_oat_filename.c_str())); 1048 if (input_oat.get() == nullptr) { 1049 LOG(ERROR) << "Could not open input oat file: " << strerror(errno); 1050 } 1051 } 1052 1053 if (output_oat_fd != -1) { 1054 if (output_oat_filename.empty()) { 1055 output_oat_filename = "output-oat-file"; 1056 } 1057 output_oat.reset(new File(output_oat_fd, output_oat_filename)); 1058 } else { 1059 CHECK(!output_oat_filename.empty()); 1060 output_oat.reset(CreateOrOpen(output_oat_filename.c_str(), &new_oat_out)); 1061 } 1062 } 1063 1064 auto cleanup = [&output_image_filename, &output_oat_filename, 1065 &new_oat_out, &new_image_out, &timings, &dump_timings](bool success) { 1066 timings.EndTiming(); 1067 if (!success) { 1068 if (new_oat_out) { 1069 CHECK(!output_oat_filename.empty()); 1070 TEMP_FAILURE_RETRY(unlink(output_oat_filename.c_str())); 1071 } 1072 if (new_image_out) { 1073 CHECK(!output_image_filename.empty()); 1074 TEMP_FAILURE_RETRY(unlink(output_image_filename.c_str())); 1075 } 1076 } 1077 if (dump_timings) { 1078 LOG(INFO) << Dumpable<TimingLogger>(timings); 1079 } 1080 }; 1081 1082 if ((have_oat_files && (input_oat.get() == nullptr || output_oat.get() == nullptr)) || 1083 (have_image_files && output_image.get() == nullptr)) { 1084 cleanup(false); 1085 return EXIT_FAILURE; 1086 } 1087 1088 ScopedFlock output_oat_lock; 1089 if (lock_output) { 1090 std::string error_msg; 1091 if (have_oat_files && !output_oat_lock.Init(output_oat.get(), &error_msg)) { 1092 LOG(ERROR) << "Unable to lock output oat " << output_image->GetPath() << ": " << error_msg; 1093 cleanup(false); 1094 return EXIT_FAILURE; 1095 } 1096 } 1097 1098 if (debug) { 1099 LOG(INFO) << "moving offset by " << base_delta 1100 << " (0x" << std::hex << base_delta << ") bytes or " 1101 << std::dec << (base_delta/kPageSize) << " pages."; 1102 } 1103 1104 bool ret; 1105 if (have_image_files && have_oat_files) { 1106 TimingLogger::ScopedTiming pt("patch image and oat", &timings); 1107 ret = PatchOat::Patch(input_oat.get(), input_image_location, base_delta, 1108 output_oat.get(), output_image.get(), isa, &timings); 1109 } else if (have_oat_files) { 1110 TimingLogger::ScopedTiming pt("patch oat", &timings); 1111 ret = PatchOat::Patch(input_oat.get(), base_delta, output_oat.get(), &timings); 1112 } else { 1113 TimingLogger::ScopedTiming pt("patch image", &timings); 1114 CHECK(have_image_files); 1115 ret = PatchOat::Patch(input_image_location, base_delta, output_image.get(), isa, &timings); 1116 } 1117 cleanup(ret); 1118 return (ret) ? EXIT_SUCCESS : EXIT_FAILURE; 1119} 1120 1121} // namespace art 1122 1123int main(int argc, char **argv) { 1124 return art::patchoat(argc, argv); 1125} 1126