The Tor Browser: toolkit/crashreporter/google-breakpad/src/common/linux/elfutils.cc@129ffea94266 (annotated)

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

toolkit/crashreporter/google-breakpad/src/common/linux/elfutils.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) 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.
 #include "common/linux/elfutils.h"
 #include <assert.h>
 #include <string.h>
 #include "common/linux/linux_libc_support.h"
 #include "common/linux/elfutils-inl.h"
 namespace google_breakpad {
 namespace {
 template<typename ElfClass>
 void FindElfClassSection(const char *elf_base,
                          const char *section_name,
                          typename ElfClass::Word section_type,
                          const void **section_start,
                          int *section_size) {
   typedef typename ElfClass::Ehdr Ehdr;
   typedef typename ElfClass::Shdr Shdr;
   assert(elf_base);
   assert(section_start);
   assert(section_size);
   assert(my_strncmp(elf_base, ELFMAG, SELFMAG) == 0);
   const Ehdr* elf_header = reinterpret_cast<const Ehdr*>(elf_base);
   assert(elf_header->e_ident[EI_CLASS] == ElfClass::kClass);
   const Shdr* sections =
     GetOffset<ElfClass,Shdr>(elf_header, elf_header->e_shoff);
   const Shdr* section_names = sections + elf_header->e_shstrndx;
   const char* names =
     GetOffset<ElfClass,char>(elf_header, section_names->sh_offset);
   const char *names_end = names + section_names->sh_size;
   const Shdr* section =
     FindElfSectionByName<ElfClass>(section_name, section_type,
                                    sections, names, names_end,
                                    elf_header->e_shnum);
   if (section != NULL && section->sh_size > 0) {
     *section_start = elf_base + section->sh_offset;
     *section_size = section->sh_size;
   }
 }
 template<typename ElfClass>
 void FindElfClassSegment(const char *elf_base,
                          typename ElfClass::Word segment_type,
                          const void **segment_start,
                          int *segment_size) {
   typedef typename ElfClass::Ehdr Ehdr;
   typedef typename ElfClass::Phdr Phdr;
   assert(elf_base);
   assert(segment_start);
   assert(segment_size);
   assert(my_strncmp(elf_base, ELFMAG, SELFMAG) == 0);
   const Ehdr* elf_header = reinterpret_cast<const Ehdr*>(elf_base);
   assert(elf_header->e_ident[EI_CLASS] == ElfClass::kClass);
   const Phdr* phdrs =
     GetOffset<ElfClass,Phdr>(elf_header, elf_header->e_phoff);
   for (int i = 0; i < elf_header->e_phnum; ++i) {
     if (phdrs[i].p_type == segment_type) {
       *segment_start = elf_base + phdrs[i].p_offset;
       *segment_size = phdrs[i].p_filesz;
       return;
     }
   }
 }
 }  // namespace
 bool IsValidElf(const void* elf_base) {
   return my_strncmp(reinterpret_cast<const char*>(elf_base),
                     ELFMAG, SELFMAG) == 0;
 }
 int ElfClass(const void* elf_base) {
   const ElfW(Ehdr)* elf_header =
     reinterpret_cast<const ElfW(Ehdr)*>(elf_base);
   return elf_header->e_ident[EI_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) {
   assert(elf_mapped_base);
   assert(section_start);
   assert(section_size);
   *section_start = NULL;
   *section_size = 0;
   if (!IsValidElf(elf_mapped_base))
     return false;
   int cls = ElfClass(elf_mapped_base);
   if (elfclass) {
     *elfclass = cls;
   }
   const char* elf_base =
     static_cast<const char*>(elf_mapped_base);
   if (cls == ELFCLASS32) {
     FindElfClassSection<ElfClass32>(elf_base, section_name, section_type,
                                     section_start, section_size);
     return *section_start != NULL;
   } else if (cls == ELFCLASS64) {
     FindElfClassSection<ElfClass64>(elf_base, section_name, section_type,
                                     section_start, section_size);
     return *section_start != NULL;
   }
   return false;
 }
 bool FindElfSegment(const void *elf_mapped_base,
                     uint32_t segment_type,
                     const void **segment_start,
                     int *segment_size,
                     int *elfclass) {
   assert(elf_mapped_base);
   assert(segment_start);
   assert(segment_size);
   *segment_start = NULL;
   *segment_size = 0;
   if (!IsValidElf(elf_mapped_base))
     return false;
   int cls = ElfClass(elf_mapped_base);
   if (elfclass) {
     *elfclass = cls;
   }
   const char* elf_base =
     static_cast<const char*>(elf_mapped_base);
   if (cls == ELFCLASS32) {
     FindElfClassSegment<ElfClass32>(elf_base, segment_type,
                                     segment_start, segment_size);
     return *segment_start != NULL;
   } else if (cls == ELFCLASS64) {
     FindElfClassSegment<ElfClass64>(elf_base, segment_type,
                                     segment_start, segment_size);
     return *segment_start != NULL;
   }
   return false;
 }
 }  // namespace google_breakpad

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

toolkit/crashreporter/google-breakpad/src/common/linux/elfutils.cc