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

--1:000000000000
+:934c9eb9a493
+// 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

The Tor Browser / file comparison

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

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