/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ // Copyright (c) 2006, 2012, Google Inc. // All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // This file is derived from the following files in // toolkit/crashreporter/google-breakpad: // src/common/android/include/elf.h // src/common/linux/elfutils.h // src/common/linux/file_id.h // src/common/linux/elfutils-inl.h #ifndef LulElfInt_h #define LulElfInt_h // This header defines functions etc internal to the ELF reader. It // should not be included outside of LulElf.cpp. #include <elf.h> #include <stdlib.h> #include "mozilla/Assertions.h" #include "PlatformMacros.h" // (derived from) // elfutils.h: Utilities for dealing with ELF files. // #include <link.h> #if defined(GP_OS_android) // From toolkit/crashreporter/google-breakpad/src/common/android/include/elf.h // The Android headers don't always define this constant. # ifndef EM_X86_64 # define EM_X86_64 62 # endif # ifndef EM_PPC64 # define EM_PPC64 21 # endif # ifndef EM_S390 # define EM_S390 22 # endif # ifndef NT_GNU_BUILD_ID # define NT_GNU_BUILD_ID 3 # endif # ifndef ElfW # define ElfW(type) _ElfW(Elf, ELFSIZE, type) # define _ElfW(e, w, t) _ElfW_1(e, w, _##t) # define _ElfW_1(e, w, t) e##w##t # endif #endif #if defined(GP_OS_freebsd) # ifndef ElfW # define ElfW(type) Elf_##type # endif #endif namespace lul { // Traits classes so consumers can write templatized code to deal // with specific ELF bits. struct ElfClass32 { typedef Elf32_Addr Addr; typedef Elf32_Ehdr Ehdr; typedef Elf32_Nhdr Nhdr; typedef Elf32_Phdr Phdr; typedef Elf32_Shdr Shdr; typedef Elf32_Half Half; typedef Elf32_Off Off; typedef Elf32_Word Word; static const int kClass = ELFCLASS32; static const size_t kAddrSize = sizeof(Elf32_Addr); }; struct ElfClass64 { typedef Elf64_Addr Addr; typedef Elf64_Ehdr Ehdr; typedef Elf64_Nhdr Nhdr; typedef Elf64_Phdr Phdr; typedef Elf64_Shdr Shdr; typedef Elf64_Half Half; typedef Elf64_Off Off; typedef Elf64_Word Word; static const int kClass = ELFCLASS64; static const size_t kAddrSize = sizeof(Elf64_Addr); }; bool IsValidElf(const void* elf_header); int ElfClass(const void* elf_base); // Attempt to find a section named |section_name| of type |section_type| // in the ELF binary data at |elf_mapped_base|. On success, returns true // and sets |*section_start| to point to the start of the section data, // and |*section_size| to the size of the section's data. If |elfclass| // is not NULL, set |*elfclass| to the ELF file class. bool FindElfSection(const void* elf_mapped_base, const char* section_name, uint32_t section_type, const void** section_start, int* section_size, int* elfclass); // Internal helper method, exposed for convenience for callers // that already have more info. template <typename ElfClass> const typename ElfClass::Shdr* FindElfSectionByName( const char* name, typename ElfClass::Word section_type, const typename ElfClass::Shdr* sections, const char* section_names, const char* names_end, int nsection); // Attempt to find the first segment of type |segment_type| in the ELF // binary data at |elf_mapped_base|. On success, returns true and sets // |*segment_start| to point to the start of the segment data, and // and |*segment_size| to the size of the segment's data. If |elfclass| // is not NULL, set |*elfclass| to the ELF file class. bool FindElfSegment(const void* elf_mapped_base, uint32_t segment_type, const void** segment_start, int* segment_size, int* elfclass); // Convert an offset from an Elf header into a pointer to the mapped // address in the current process. Takes an extra template parameter // to specify the return type to avoid having to dynamic_cast the // result. template <typename ElfClass, typename T> const T* GetOffset(const typename ElfClass::Ehdr* elf_header, typename ElfClass::Off offset); // (derived from) // file_id.h: Return a unique identifier for a file // static const size_t kMDGUIDSize = sizeof(MDGUID); class FileID { public: // Load the identifier for the elf file mapped into memory at |base| into // |identifier|. Return false if the identifier could not be created for the // file. static bool ElfFileIdentifierFromMappedFile(const void* base, uint8_t identifier[kMDGUIDSize]); // Convert the |identifier| data to a NULL terminated string. The string will // be formatted as a UUID (e.g., 22F065BB-FC9C-49F7-80FE-26A7CEBD7BCE). // The |buffer| should be at least 37 bytes long to receive all of the data // and termination. Shorter buffers will contain truncated data. static void ConvertIdentifierToString(const uint8_t identifier[kMDGUIDSize], char* buffer, int buffer_length); }; template <typename ElfClass, typename T> const T* GetOffset(const typename ElfClass::Ehdr* elf_header, typename ElfClass::Off offset) { return reinterpret_cast<const T*>(reinterpret_cast<uintptr_t>(elf_header) + offset); } template <typename ElfClass> const typename ElfClass::Shdr* FindElfSectionByName( const char* name, typename ElfClass::Word section_type, const typename ElfClass::Shdr* sections, const char* section_names, const char* names_end, int nsection) { MOZ_ASSERT(name != NULL); MOZ_ASSERT(sections != NULL); MOZ_ASSERT(nsection > 0); int name_len = strlen(name); if (name_len == 0) return NULL; for (int i = 0; i < nsection; ++i) { const char* section_name = section_names + sections[i].sh_name; if (sections[i].sh_type == section_type && names_end - section_name >= name_len + 1 && strcmp(name, section_name) == 0) { return sections + i; } } return NULL; } } // namespace lul // And finally, the external interface, offered to LulMain.cpp #include "LulElfExt.h" #endif // LulElfInt_h