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

toolkit/crashreporter/google-breakpad/src/common/mac/macho_walker.cc@129ffea94266 (annotated)

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

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 // 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

The Tor Browser / annotate

toolkit/crashreporter/google-breakpad/src/common/mac/macho_walker.cc@129ffea94266 (annotated)

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