1 files changed, 241 insertions, 0 deletions
diff --git a/toolkit/crashreporter/google-breakpad/src/common/linux/elfutils.cc b/toolkit/crashreporter/google-breakpad/src/common/linux/elfutils.cc
new file mode 100644
index 0000000000..e2e16e6dfd
--- /dev/null
+++ b/toolkit/crashreporter/google-breakpad/src/common/linux/elfutils.cc
@@ -0,0 +1,241 @@
+// 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"
+
+#if defined(__FreeBSD__)
+#  define ElfW(type) Elf_##type
+#endif
+
+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,
+                         size_t *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,
+                         wasteful_vector<ElfSegment> *segments) {
+  typedef typename ElfClass::Ehdr Ehdr;
+  typedef typename ElfClass::Phdr Phdr;
+
+  assert(elf_base);
+  assert(segments);
+
+  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) {
+      ElfSegment seg = {};
+      seg.start = elf_base + phdrs[i].p_offset;
+      seg.size = phdrs[i].p_filesz;
+      segments->push_back(seg);
+    }
+  }
+}
+
+}  // 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,
+                    size_t *section_size) {
+  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);
+  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 FindElfSegments(const void* elf_mapped_base,
+                     uint32_t segment_type,
+                     wasteful_vector<ElfSegment>* segments) {
+  assert(elf_mapped_base);
+  assert(segments);
+
+  if (!IsValidElf(elf_mapped_base))
+    return false;
+
+  int cls = ElfClass(elf_mapped_base);
+  const char* elf_base =
+    static_cast<const char*>(elf_mapped_base);
+
+  if (cls == ELFCLASS32) {
+    FindElfClassSegment<ElfClass32>(elf_base, segment_type, segments);
+    return true;
+  } else if (cls == ELFCLASS64) {
+    FindElfClassSegment<ElfClass64>(elf_base, segment_type, segments);
+    return true;
+  }
+
+  return false;
+}
+
+template <typename ElfClass>
+bool FindElfSoNameFromDynamicSection(const void* section_start,
+                                     size_t section_size,
+                                     const void* dynstr_start,
+                                     size_t dynstr_size,
+                                     char* soname,
+                                     size_t soname_size) {
+  typedef typename ElfClass::Dyn Dyn;
+
+  auto* dynamic = static_cast<const Dyn*>(section_start);
+  size_t dcount = section_size / sizeof(Dyn);
+  for (const Dyn* dyn = dynamic; dyn < dynamic + dcount; ++dyn) {
+    if (dyn->d_tag == DT_SONAME) {
+      const char* dynstr = static_cast<const char*>(dynstr_start);
+      if (dyn->d_un.d_val >= dynstr_size) {
+        // Beyond the end of the dynstr section
+        return false;
+      }
+      const char* str = dynstr + dyn->d_un.d_val;
+      const size_t maxsize = dynstr_size - dyn->d_un.d_val;
+      my_strlcpy(soname, str, maxsize < soname_size ? maxsize : soname_size);
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool ElfFileSoNameFromMappedFile(const void* elf_base,
+                                 char* soname,
+                                 size_t soname_size) {
+  if (!IsValidElf(elf_base)) {
+    // Not ELF
+    return false;
+  }
+
+  const void* segment_start;
+  size_t segment_size;
+  if (!FindElfSection(elf_base, ".dynamic", SHT_DYNAMIC, &segment_start,
+                      &segment_size)) {
+    // No dynamic section
+    return false;
+  }
+
+  const void* dynstr_start;
+  size_t dynstr_size;
+  if (!FindElfSection(elf_base, ".dynstr", SHT_STRTAB, &dynstr_start,
+                      &dynstr_size)) {
+    // No dynstr section
+    return false;
+  }
+
+  int cls = ElfClass(elf_base);
+  return cls == ELFCLASS32 ? FindElfSoNameFromDynamicSection<ElfClass32>(
+                                 segment_start, segment_size, dynstr_start,
+                                 dynstr_size, soname, soname_size)
+                           : FindElfSoNameFromDynamicSection<ElfClass64>(
+                                 segment_start, segment_size, dynstr_start,
+                                 dynstr_size, soname, soname_size);
+}
+
+}  // namespace google_breakpad