264 lines
9.9 KiB
C++
264 lines
9.9 KiB
C++
// Copyright (c) 2010, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Unit tests for FileID
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#include <elf.h>
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#include <stdlib.h>
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#include <string>
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#include "common/linux/elf_gnu_compat.h"
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#include "common/linux/elfutils.h"
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#include "common/linux/file_id.h"
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#include "common/linux/safe_readlink.h"
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#include "common/linux/synth_elf.h"
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#include "common/test_assembler.h"
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#include "common/tests/auto_tempdir.h"
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#include "common/using_std_string.h"
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#include "breakpad_googletest_includes.h"
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using namespace google_breakpad;
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using google_breakpad::ElfClass32;
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using google_breakpad::ElfClass64;
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using google_breakpad::SafeReadLink;
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using google_breakpad::synth_elf::ELF;
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using google_breakpad::synth_elf::Notes;
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using google_breakpad::test_assembler::kLittleEndian;
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using google_breakpad::test_assembler::Section;
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using ::testing::Types;
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namespace {
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// Simply calling Section::Append(size, byte) produces a uninteresting pattern
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// that tends to get hashed to 0000...0000. This populates the section with
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// data to produce better hashes.
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void PopulateSection(Section* section, int size, int prime_number) {
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for (int i = 0; i < size; i++)
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section->Append(1, (i % prime_number) % 256);
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}
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} // namespace
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#ifndef __ANDROID__
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// This test is disabled on Android: It will always fail, since there is no
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// 'strip' binary installed on test devices.
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TEST(FileIDStripTest, StripSelf) {
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// Calculate the File ID of this binary using
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// FileID::ElfFileIdentifier, then make a copy of this binary,
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// strip it, and ensure that the result is the same.
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char exe_name[PATH_MAX];
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ASSERT_TRUE(SafeReadLink("/proc/self/exe", exe_name));
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// copy our binary to a temp file, and strip it
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AutoTempDir temp_dir;
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string templ = temp_dir.path() + "/file-id-unittest";
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char cmdline[4096];
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sprintf(cmdline, "cp \"%s\" \"%s\"", exe_name, templ.c_str());
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ASSERT_EQ(0, system(cmdline)) << "Failed to execute: " << cmdline;
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sprintf(cmdline, "chmod u+w \"%s\"", templ.c_str());
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ASSERT_EQ(0, system(cmdline)) << "Failed to execute: " << cmdline;
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sprintf(cmdline, "strip \"%s\"", templ.c_str());
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ASSERT_EQ(0, system(cmdline)) << "Failed to execute: " << cmdline;
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uint8_t identifier1[sizeof(MDGUID)];
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uint8_t identifier2[sizeof(MDGUID)];
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FileID fileid1(exe_name);
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EXPECT_TRUE(fileid1.ElfFileIdentifier(identifier1));
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FileID fileid2(templ.c_str());
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EXPECT_TRUE(fileid2.ElfFileIdentifier(identifier2));
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char identifier_string1[37];
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char identifier_string2[37];
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FileID::ConvertIdentifierToString(identifier1, identifier_string1,
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37);
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FileID::ConvertIdentifierToString(identifier2, identifier_string2,
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37);
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EXPECT_STREQ(identifier_string1, identifier_string2);
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}
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#endif // !__ANDROID__
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template<typename ElfClass>
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class FileIDTest : public testing::Test {
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public:
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void GetElfContents(ELF& elf) {
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string contents;
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ASSERT_TRUE(elf.GetContents(&contents));
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ASSERT_LT(0U, contents.size());
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elfdata_v.clear();
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elfdata_v.insert(elfdata_v.begin(), contents.begin(), contents.end());
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elfdata = &elfdata_v[0];
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}
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vector<uint8_t> elfdata_v;
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uint8_t* elfdata;
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};
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typedef Types<ElfClass32, ElfClass64> ElfClasses;
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TYPED_TEST_CASE(FileIDTest, ElfClasses);
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TYPED_TEST(FileIDTest, ElfClass) {
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uint8_t identifier[sizeof(MDGUID)];
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const char expected_identifier_string[] =
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"80808080-8080-0000-0000-008080808080";
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char identifier_string[sizeof(expected_identifier_string)];
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const size_t kTextSectionSize = 128;
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ELF elf(EM_386, TypeParam::kClass, kLittleEndian);
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Section text(kLittleEndian);
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for (size_t i = 0; i < kTextSectionSize; ++i) {
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text.D8(i * 3);
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}
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elf.AddSection(".text", text, SHT_PROGBITS);
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elf.Finish();
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this->GetElfContents(elf);
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EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
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identifier));
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FileID::ConvertIdentifierToString(identifier, identifier_string,
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sizeof(identifier_string));
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EXPECT_STREQ(expected_identifier_string, identifier_string);
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}
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TYPED_TEST(FileIDTest, BuildID) {
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const uint8_t kExpectedIdentifier[sizeof(MDGUID)] =
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{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};
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char expected_identifier_string[] =
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"00000000-0000-0000-0000-000000000000";
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FileID::ConvertIdentifierToString(kExpectedIdentifier,
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expected_identifier_string,
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sizeof(expected_identifier_string));
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uint8_t identifier[sizeof(MDGUID)];
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char identifier_string[sizeof(expected_identifier_string)];
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ELF elf(EM_386, TypeParam::kClass, kLittleEndian);
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Section text(kLittleEndian);
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text.Append(4096, 0);
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elf.AddSection(".text", text, SHT_PROGBITS);
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Notes notes(kLittleEndian);
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notes.AddNote(NT_GNU_BUILD_ID, "GNU", kExpectedIdentifier,
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sizeof(kExpectedIdentifier));
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elf.AddSection(".note.gnu.build-id", notes, SHT_NOTE);
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elf.Finish();
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this->GetElfContents(elf);
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EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
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identifier));
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FileID::ConvertIdentifierToString(identifier, identifier_string,
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sizeof(identifier_string));
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EXPECT_STREQ(expected_identifier_string, identifier_string);
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}
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TYPED_TEST(FileIDTest, BuildIDPH) {
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const uint8_t kExpectedIdentifier[sizeof(MDGUID)] =
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{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};
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char expected_identifier_string[] =
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"00000000-0000-0000-0000-000000000000";
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FileID::ConvertIdentifierToString(kExpectedIdentifier,
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expected_identifier_string,
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sizeof(expected_identifier_string));
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uint8_t identifier[sizeof(MDGUID)];
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char identifier_string[sizeof(expected_identifier_string)];
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ELF elf(EM_386, TypeParam::kClass, kLittleEndian);
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Section text(kLittleEndian);
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text.Append(4096, 0);
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elf.AddSection(".text", text, SHT_PROGBITS);
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Notes notes(kLittleEndian);
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notes.AddNote(0, "Linux",
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reinterpret_cast<const uint8_t *>("\0x42\0x02\0\0"), 4);
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notes.AddNote(NT_GNU_BUILD_ID, "GNU", kExpectedIdentifier,
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sizeof(kExpectedIdentifier));
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int note_idx = elf.AddSection(".note", notes, SHT_NOTE);
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elf.AddSegment(note_idx, note_idx, PT_NOTE);
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elf.Finish();
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this->GetElfContents(elf);
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EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
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identifier));
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FileID::ConvertIdentifierToString(identifier, identifier_string,
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sizeof(identifier_string));
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EXPECT_STREQ(expected_identifier_string, identifier_string);
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}
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// Test to make sure two files with different text sections produce
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// different hashes when not using a build id.
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TYPED_TEST(FileIDTest, UniqueHashes) {
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char identifier_string_1[] =
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"00000000-0000-0000-0000-000000000000";
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char identifier_string_2[] =
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"00000000-0000-0000-0000-000000000000";
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uint8_t identifier_1[sizeof(MDGUID)];
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uint8_t identifier_2[sizeof(MDGUID)];
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{
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ELF elf1(EM_386, TypeParam::kClass, kLittleEndian);
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Section foo_1(kLittleEndian);
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PopulateSection(&foo_1, 32, 5);
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elf1.AddSection(".foo", foo_1, SHT_PROGBITS);
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Section text_1(kLittleEndian);
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PopulateSection(&text_1, 4096, 17);
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elf1.AddSection(".text", text_1, SHT_PROGBITS);
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elf1.Finish();
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this->GetElfContents(elf1);
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}
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EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
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identifier_1));
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FileID::ConvertIdentifierToString(identifier_1, identifier_string_1,
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sizeof(identifier_string_1));
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{
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ELF elf2(EM_386, TypeParam::kClass, kLittleEndian);
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Section text_2(kLittleEndian);
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Section foo_2(kLittleEndian);
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PopulateSection(&foo_2, 32, 5);
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elf2.AddSection(".foo", foo_2, SHT_PROGBITS);
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PopulateSection(&text_2, 4096, 31);
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elf2.AddSection(".text", text_2, SHT_PROGBITS);
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elf2.Finish();
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this->GetElfContents(elf2);
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}
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EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
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identifier_2));
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FileID::ConvertIdentifierToString(identifier_2, identifier_string_2,
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sizeof(identifier_string_2));
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EXPECT_STRNE(identifier_string_1, identifier_string_2);
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}
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