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

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.

     1 // Copyright (c) 2012, Google Inc.

     2 // All rights reserved.

     3 //

     4 // Redistribution and use in source and binary forms, with or without

     5 // modification, are permitted provided that the following conditions are

     6 // met:

     7 //

     8 //     * Redistributions of source code must retain the above copyright

     9 // notice, this list of conditions and the following disclaimer.

    10 //     * Redistributions in binary form must reproduce the above

    11 // copyright notice, this list of conditions and the following disclaimer

    12 // in the documentation and/or other materials provided with the

    13 // distribution.

    14 //     * Neither the name of Google Inc. nor the names of its

    15 // contributors may be used to endorse or promote products derived from

    16 // this software without specific prior written permission.

    17 //

    18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

    22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

    24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

    25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

    26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    30 #include "common/linux/elfutils.h"

    32 #include <assert.h>

    33 #include <string.h>

    35 #include "common/linux/linux_libc_support.h"

    36 #include "common/linux/elfutils-inl.h"

    38 namespace google_breakpad {

    40 namespace {

    42 template<typename ElfClass>

    43 void FindElfClassSection(const char *elf_base,

    44                          const char *section_name,

    45                          typename ElfClass::Word section_type,

    46                          const void **section_start,

    47                          int *section_size) {

    48   typedef typename ElfClass::Ehdr Ehdr;

    49   typedef typename ElfClass::Shdr Shdr;

    51   assert(elf_base);

    52   assert(section_start);

    53   assert(section_size);

    55   assert(my_strncmp(elf_base, ELFMAG, SELFMAG) == 0);

    57   const Ehdr* elf_header = reinterpret_cast<const Ehdr*>(elf_base);

    58   assert(elf_header->e_ident[EI_CLASS] == ElfClass::kClass);

    60   const Shdr* sections =

    61     GetOffset<ElfClass,Shdr>(elf_header, elf_header->e_shoff);

    62   const Shdr* section_names = sections + elf_header->e_shstrndx;

    63   const char* names =

    64     GetOffset<ElfClass,char>(elf_header, section_names->sh_offset);

    65   const char *names_end = names + section_names->sh_size;

    67   const Shdr* section =

    68     FindElfSectionByName<ElfClass>(section_name, section_type,

    69                                    sections, names, names_end,

    70                                    elf_header->e_shnum);

    72   if (section != NULL && section->sh_size > 0) {

    73     *section_start = elf_base + section->sh_offset;

    74     *section_size = section->sh_size;

    75   }

    76 }

    78 template<typename ElfClass>

    79 void FindElfClassSegment(const char *elf_base,

    80                          typename ElfClass::Word segment_type,

    81                          const void **segment_start,

    82                          int *segment_size) {

    83   typedef typename ElfClass::Ehdr Ehdr;

    84   typedef typename ElfClass::Phdr Phdr;

    86   assert(elf_base);

    87   assert(segment_start);

    88   assert(segment_size);

    90   assert(my_strncmp(elf_base, ELFMAG, SELFMAG) == 0);

    92   const Ehdr* elf_header = reinterpret_cast<const Ehdr*>(elf_base);

    93   assert(elf_header->e_ident[EI_CLASS] == ElfClass::kClass);

    95   const Phdr* phdrs =

    96     GetOffset<ElfClass,Phdr>(elf_header, elf_header->e_phoff);

    98   for (int i = 0; i < elf_header->e_phnum; ++i) {

    99     if (phdrs[i].p_type == segment_type) {

   100       *segment_start = elf_base + phdrs[i].p_offset;

   101       *segment_size = phdrs[i].p_filesz;

   102       return;

   103     }

   104   }

   105 }

   107 }  // namespace

   109 bool IsValidElf(const void* elf_base) {

   110   return my_strncmp(reinterpret_cast<const char*>(elf_base),

   111                     ELFMAG, SELFMAG) == 0;

   112 }

   114 int ElfClass(const void* elf_base) {

   115   const ElfW(Ehdr)* elf_header =

   116     reinterpret_cast<const ElfW(Ehdr)*>(elf_base);

   118   return elf_header->e_ident[EI_CLASS];

   119 }

   121 bool FindElfSection(const void *elf_mapped_base,

   122                     const char *section_name,

   123                     uint32_t section_type,

   124                     const void **section_start,

   125                     int *section_size,

   126                     int *elfclass) {

   127   assert(elf_mapped_base);

   128   assert(section_start);

   129   assert(section_size);

   131   *section_start = NULL;

   132   *section_size = 0;

   134   if (!IsValidElf(elf_mapped_base))

   135     return false;

   137   int cls = ElfClass(elf_mapped_base);

   138   if (elfclass) {

   139     *elfclass = cls;

   140   }

   142   const char* elf_base =

   143     static_cast<const char*>(elf_mapped_base);

   145   if (cls == ELFCLASS32) {

   146     FindElfClassSection<ElfClass32>(elf_base, section_name, section_type,

   147                                     section_start, section_size);

   148     return *section_start != NULL;

   149   } else if (cls == ELFCLASS64) {

   150     FindElfClassSection<ElfClass64>(elf_base, section_name, section_type,

   151                                     section_start, section_size);

   152     return *section_start != NULL;

   153   }

   155   return false;

   156 }

   158 bool FindElfSegment(const void *elf_mapped_base,

   159                     uint32_t segment_type,

   160                     const void **segment_start,

   161                     int *segment_size,

   162                     int *elfclass) {

   163   assert(elf_mapped_base);

   164   assert(segment_start);

   165   assert(segment_size);

   167   *segment_start = NULL;

   168   *segment_size = 0;

   170   if (!IsValidElf(elf_mapped_base))

   171     return false;

   173   int cls = ElfClass(elf_mapped_base);

   174   if (elfclass) {

   175     *elfclass = cls;

   176   }

   178   const char* elf_base =

   179     static_cast<const char*>(elf_mapped_base);

   181   if (cls == ELFCLASS32) {

   182     FindElfClassSegment<ElfClass32>(elf_base, segment_type,

   183                                     segment_start, segment_size);

   184     return *segment_start != NULL;

   185   } else if (cls == ELFCLASS64) {

   186     FindElfClassSegment<ElfClass64>(elf_base, segment_type,

   187                                     segment_start, segment_size);

   188     return *segment_start != NULL;

   189   }

   191   return false;

   192 }

   194 }  // namespace google_breakpad

The Tor Browser / file revision

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

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