The Tor Browser: comparison toolkit/crashreporter/google-breakpad/src/common/mac/macho

--1:000000000000
+:e0a55de1dfb6
+// Copyright (c) 2006, 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.
+// macho_walker.cc: Iterate over the load commands in a mach-o file
+//
+// See macho_walker.h for documentation
+//
+// Author: Dan Waylonis
+extern "C" {  // necessary for Leopard
+#include <assert.h>
+#include <fcntl.h>
+#include <mach-o/arch.h>
+#include <mach-o/loader.h>
+#include <mach-o/swap.h>
+#include <string.h>
+#include <unistd.h>
+}
+#include "common/mac/byteswap.h"
+#include "common/mac/macho_walker.h"
+#include "common/mac/macho_utilities.h"
+namespace MacFileUtilities {
+MachoWalker::MachoWalker(const char *path, LoadCommandCallback callback,
+void *context)
+: file_(0),
+memory_(NULL),
+memory_size_(0),
+callback_(callback),
+callback_context_(context),
+current_header_(NULL),
+current_header_size_(0),
+current_header_offset_(0) {
+file_ = open(path, O_RDONLY);
+}
+MachoWalker::MachoWalker(void *memory, size_t size,
+LoadCommandCallback callback, void *context)
+: file_(0),
+memory_(memory),
+memory_size_(size),
+callback_(callback),
+callback_context_(context),
+current_header_(NULL),
+current_header_size_(0),
+current_header_offset_(0) {
+}
+MachoWalker::~MachoWalker() {
+if (file_ != -1)
+close(file_);
+}
+bool MachoWalker::WalkHeader(cpu_type_t cpu_type, cpu_subtype_t cpu_subtype) {
+cpu_type_t valid_cpu_type = cpu_type;
+cpu_subtype_t valid_cpu_subtype = cpu_subtype;
+// if |cpu_type| is 0, use the native cpu type.
+if (cpu_type == 0) {
+const NXArchInfo *arch = NXGetLocalArchInfo();
+assert(arch);
+valid_cpu_type = arch->cputype;
+valid_cpu_subtype = CPU_SUBTYPE_MULTIPLE;
+}
+off_t offset;
+if (FindHeader(valid_cpu_type, valid_cpu_subtype, offset)) {
+if (cpu_type & CPU_ARCH_ABI64)
+return WalkHeader64AtOffset(offset);
+return WalkHeaderAtOffset(offset);
+}
+return false;
+}
+bool MachoWalker::ReadBytes(void *buffer, size_t size, off_t offset) {
+if (memory_) {
+if (offset < 0)
+return false;
+bool result = true;
+if (offset + size > memory_size_) {
+if (static_cast<size_t>(offset) >= memory_size_)
+return false;
+size = memory_size_ - static_cast<size_t>(offset);
+result = false;
+}
+memcpy(buffer, static_cast<char *>(memory_) + offset, size);
+return result;
+} else {
+return pread(file_, buffer, size, offset) == (ssize_t)size;
+}
+}
+bool MachoWalker::CurrentHeader(struct mach_header_64 *header, off_t *offset) {
+if (current_header_) {
+memcpy(header, current_header_, sizeof(mach_header_64));
+*offset = current_header_offset_;
+return true;
+}
+return false;
+}
+bool MachoWalker::FindHeader(cpu_type_t cpu_type,
+cpu_subtype_t cpu_subtype,
+off_t &offset) {
+// Read the magic bytes that's common amongst all mach-o files
+uint32_t magic;
+if (!ReadBytes(&magic, sizeof(magic), 0))
+return false;
+offset = sizeof(magic);
+// Figure out what type of file we've got
+bool is_fat = false;
+if (magic == FAT_MAGIC || magic == FAT_CIGAM) {
+is_fat = true;
+}
+else if (magic != MH_MAGIC && magic != MH_CIGAM && magic != MH_MAGIC_64 &&
+magic != MH_CIGAM_64) {
+return false;
+}
+if (!is_fat) {
+// If we don't have a fat header, check if the cpu type matches the single
+// header
+struct mach_header header;
+if (!ReadBytes(&header, sizeof(header), 0))
+return false;
+if (magic == MH_CIGAM || magic == MH_CIGAM_64)
+swap_mach_header(&header, NXHostByteOrder());
+if (cpu_type != header.cputype ||
+(cpu_subtype != CPU_SUBTYPE_MULTIPLE &&
+cpu_subtype != header.cpusubtype)) {
+return false;
+}
+offset = 0;
+return true;
+} else {
+// Read the fat header and find an appropriate architecture
+offset = 0;
+struct fat_header fat;
+if (!ReadBytes(&fat, sizeof(fat), offset))
+return false;
+if (NXHostByteOrder() != NX_BigEndian)
+swap_fat_header(&fat, NXHostByteOrder());
+offset += sizeof(fat);
+// Search each architecture for the desired one
+struct fat_arch arch;
+for (uint32_t i = 0; i < fat.nfat_arch; ++i) {
+if (!ReadBytes(&arch, sizeof(arch), offset))
+return false;
+if (NXHostByteOrder() != NX_BigEndian)
+swap_fat_arch(&arch, 1, NXHostByteOrder());
+if (arch.cputype == cpu_type &&
+(cpu_subtype == CPU_SUBTYPE_MULTIPLE ||
+arch.cpusubtype == cpu_subtype)) {
+offset = arch.offset;
+return true;
+}
+offset += sizeof(arch);
+}
+}
+return false;
+}
+bool MachoWalker::WalkHeaderAtOffset(off_t offset) {
+struct mach_header header;
+if (!ReadBytes(&header, sizeof(header), offset))
+return false;
+bool swap = (header.magic == MH_CIGAM);
+if (swap)
+swap_mach_header(&header, NXHostByteOrder());
+// Copy the data into the mach_header_64 structure.  Since the 32-bit and
+// 64-bit only differ in the last field (reserved), this is safe to do.
+struct mach_header_64 header64;
+memcpy((void *)&header64, (const void *)&header, sizeof(header));
+header64.reserved = 0;
+current_header_ = &header64;
+current_header_size_ = sizeof(header); // 32-bit, not 64-bit
+current_header_offset_ = offset;
+offset += current_header_size_;
+bool result = WalkHeaderCore(offset, header.ncmds, swap);
+current_header_ = NULL;
+current_header_size_ = 0;
+current_header_offset_ = 0;
+return result;
+}
+bool MachoWalker::WalkHeader64AtOffset(off_t offset) {
+struct mach_header_64 header;
+if (!ReadBytes(&header, sizeof(header), offset))
+return false;
+bool swap = (header.magic == MH_CIGAM_64);
+if (swap)
+breakpad_swap_mach_header_64(&header, NXHostByteOrder());
+current_header_ = &header;
+current_header_size_ = sizeof(header);
+current_header_offset_ = offset;
+offset += current_header_size_;
+bool result = WalkHeaderCore(offset, header.ncmds, swap);
+current_header_ = NULL;
+current_header_size_ = 0;
+current_header_offset_ = 0;
+return result;
+}
+bool MachoWalker::WalkHeaderCore(off_t offset, uint32_t number_of_commands,
+bool swap) {
+for (uint32_t i = 0; i < number_of_commands; ++i) {
+struct load_command cmd;
+if (!ReadBytes(&cmd, sizeof(cmd), offset))
+return false;
+if (swap)
+swap_load_command(&cmd, NXHostByteOrder());
+// Call the user callback
+if (callback_ && !callback_(this, &cmd, offset, swap, callback_context_))
+break;
+offset += cmd.cmdsize;
+}
+return true;
+}
+}  // namespace MacFileUtilities

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comparison: toolkit/crashreporter/google-breakpad/src/common/mac/macho_walker.cc

toolkit/crashreporter/google-breakpad/src/common/mac/macho_walker.cc