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Dump INFO CODE_ID containing Build ID in Linux dump_syms

Browse source 
I'd like to have the Build ID available for our symbol server
uploading, and this will make it easy.

Most of this change is me rewriting dump_symbols_unittest to be
typed tests so I could add a new test there.

R=mark@chromium.org
BUG=

Review URL: https://codereview.chromium.org/2052263002 .
This commit is contained in:
Ted Mielczarek 2016-06-10 13:23:29 -04:00
parent 7fc25b8962
commit c44217f646
9 changed files with 125 additions and 34 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
src/common/linux/dump_symbols.cc
View file

@ -926,8 +926,10 @@ bool InitModuleForElfClass(const typename ElfClass::Ehdr* elf_header,
// number appended to the end of the file identifier; this isn't
// really used or necessary on other platforms, but be consistent.
string id = FileID::ConvertIdentifierToUUIDString(identifier) + "0";
// This is just the raw Build ID in hex.
string code_id = FileID::ConvertIdentifierToString(identifier);
module.reset(new Module(name, os, architecture, id));
module.reset(new Module(name, os, architecture, id, code_id));
return true;
}

76
src/common/linux/dump_symbols_unittest.cc
View file

@ -40,6 +40,8 @@
#include <vector>
#include "breakpad_googletest_includes.h"
#include "common/linux/elf_gnu_compat.h"
#include "common/linux/elfutils.h"
#include "common/linux/dump_symbols.h"
#include "common/linux/synth_elf.h"
#include "common/module.h"
@ -54,6 +56,7 @@ bool ReadSymbolDataInternal(const uint8_t* obj_file,
Module** module);
using google_breakpad::synth_elf::ELF;
using google_breakpad::synth_elf::Notes;
using google_breakpad::synth_elf::StringTable;
using google_breakpad::synth_elf::SymbolTable;
using google_breakpad::test_assembler::kLittleEndian;
@ -61,7 +64,9 @@ using google_breakpad::test_assembler::Section;
using std::stringstream;
using std::vector;
using ::testing::Test;
using ::testing::Types;
template<typename ElfClass>
class DumpSymbols : public Test {
public:
void GetElfContents(ELF& elf) {
@ -78,7 +83,11 @@ class DumpSymbols : public Test {
uint8_t* elfdata;
};
TEST_F(DumpSymbols, Invalid) {
typedef Types<ElfClass32, ElfClass64> ElfClasses;
TYPED_TEST_CASE(DumpSymbols, ElfClasses);
TYPED_TEST(DumpSymbols, Invalid) {
Elf32_Ehdr header;
memset(&header, 0, sizeof(header));
Module* module;
@ -90,8 +99,8 @@ TEST_F(DumpSymbols, Invalid) {
&module));
}
TEST_F(DumpSymbols, SimplePublic32) {
ELF elf(EM_386, ELFCLASS32, kLittleEndian);
TYPED_TEST(DumpSymbols, SimplePublic) {
ELF elf(TypeParam::kMachine, TypeParam::kClass, kLittleEndian);
// Zero out text section for simplicity.
Section text(kLittleEndian);
text.Append(4096, 0);
@ -99,8 +108,11 @@ TEST_F(DumpSymbols, SimplePublic32) {
// Add a public symbol.
StringTable table(kLittleEndian);
SymbolTable syms(kLittleEndian, 4, table);
syms.AddSymbol("superfunc", (uint32_t)0x1000, (uint32_t)0x10,
SymbolTable syms(kLittleEndian, TypeParam::kAddrSize, table);
syms.AddSymbol("superfunc",
(typename TypeParam::Addr)0x1000,
(typename TypeParam::Addr)0x10,
// ELF32_ST_INFO works for 32-or 64-bit.
ELF32_ST_INFO(STB_GLOBAL, STT_FUNC),
SHN_UNDEF + 1);
int index = elf.AddSection(".dynstr", table, SHT_STRTAB);
@ -109,14 +121,14 @@ TEST_F(DumpSymbols, SimplePublic32) {
SHF_ALLOC, // flags
0, // addr
index, // link
sizeof(Elf32_Sym)); // entsize
sizeof(typename TypeParam::Sym)); // entsize
elf.Finish();
GetElfContents(elf);
this->GetElfContents(elf);
Module* module;
DumpOptions options(ALL_SYMBOL_DATA, true);
EXPECT_TRUE(ReadSymbolDataInternal(elfdata,
EXPECT_TRUE(ReadSymbolDataInternal(this->elfdata,
"foo",
vector<string>(),
options,
@ -124,24 +136,40 @@ TEST_F(DumpSymbols, SimplePublic32) {
stringstream s;
module->Write(s, ALL_SYMBOL_DATA);
EXPECT_EQ("MODULE Linux x86 000000000000000000000000000000000 foo\n"
"PUBLIC 1000 0 superfunc\n",
s.str());
const string expected =
string("MODULE Linux ") + TypeParam::kMachineName
+ " 000000000000000000000000000000000 foo\n"
"INFO CODE_ID 00000000000000000000000000000000\n"
"PUBLIC 1000 0 superfunc\n";
EXPECT_EQ(expected, s.str());
delete module;
}
TEST_F(DumpSymbols, SimplePublic64) {
ELF elf(EM_X86_64, ELFCLASS64, kLittleEndian);
TYPED_TEST(DumpSymbols, SimpleBuildID) {
ELF elf(TypeParam::kMachine, TypeParam::kClass, kLittleEndian);
// Zero out text section for simplicity.
Section text(kLittleEndian);
text.Append(4096, 0);
elf.AddSection(".text", text, SHT_PROGBITS);
// Add a Build ID
const uint8_t kExpectedIdentifierBytes[] =
{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13};
Notes notes(kLittleEndian);
notes.AddNote(NT_GNU_BUILD_ID, "GNU", kExpectedIdentifierBytes,
sizeof(kExpectedIdentifierBytes));
elf.AddSection(".note.gnu.build-id", notes, SHT_NOTE);
// Add a public symbol.
StringTable table(kLittleEndian);
SymbolTable syms(kLittleEndian, 8, table);
syms.AddSymbol("superfunc", (uint64_t)0x1000, (uint64_t)0x10,
ELF64_ST_INFO(STB_GLOBAL, STT_FUNC),
SymbolTable syms(kLittleEndian, TypeParam::kAddrSize, table);
syms.AddSymbol("superfunc",
(typename TypeParam::Addr)0x1000,
(typename TypeParam::Addr)0x10,
// ELF32_ST_INFO works for 32-or 64-bit.
ELF32_ST_INFO(STB_GLOBAL, STT_FUNC),
SHN_UNDEF + 1);
int index = elf.AddSection(".dynstr", table, SHT_STRTAB);
elf.AddSection(".dynsym", syms,
@ -149,14 +177,14 @@ TEST_F(DumpSymbols, SimplePublic64) {
SHF_ALLOC, // flags
0, // addr
index, // link
sizeof(Elf64_Sym)); // entsize
sizeof(typename TypeParam::Sym)); // entsize
elf.Finish();
GetElfContents(elf);
this->GetElfContents(elf);
Module* module;
DumpOptions options(ALL_SYMBOL_DATA, true);
EXPECT_TRUE(ReadSymbolDataInternal(elfdata,
EXPECT_TRUE(ReadSymbolDataInternal(this->elfdata,
"foo",
vector<string>(),
options,
@ -164,9 +192,13 @@ TEST_F(DumpSymbols, SimplePublic64) {
stringstream s;
module->Write(s, ALL_SYMBOL_DATA);
EXPECT_EQ("MODULE Linux x86_64 000000000000000000000000000000000 foo\n"
"PUBLIC 1000 0 superfunc\n",
s.str());
const string expected =
string("MODULE Linux ") + TypeParam::kMachineName
+ " 030201000504070608090A0B0C0D0E0F0 foo\n"
"INFO CODE_ID 000102030405060708090A0B0C0D0E0F10111213\n"
"PUBLIC 1000 0 superfunc\n";
EXPECT_EQ(expected, s.str());
delete module;
}
} // namespace google_breakpad

8
src/common/linux/elfutils.h
View file

@ -49,9 +49,13 @@ struct ElfClass32 {
typedef Elf32_Shdr Shdr;
typedef Elf32_Half Half;
typedef Elf32_Off Off;
typedef Elf32_Sym Sym;
typedef Elf32_Word Word;
static const int kClass = ELFCLASS32;
static const uint16_t kMachine = EM_386;
static const size_t kAddrSize = sizeof(Elf32_Addr);
static constexpr const char* kMachineName = "x86";
};
struct ElfClass64 {
@ -62,9 +66,13 @@ struct ElfClass64 {
typedef Elf64_Shdr Shdr;
typedef Elf64_Half Half;
typedef Elf64_Off Off;
typedef Elf64_Sym Sym;
typedef Elf64_Word Word;
static const int kClass = ELFCLASS64;
static const uint16_t kMachine = EM_X86_64;
static const size_t kAddrSize = sizeof(Elf64_Addr);
static constexpr const char* kMachineName = "x86_64";
};
bool IsValidElf(const void* elf_header);

26
src/common/linux/file_id.cc
View file

@ -164,8 +164,18 @@ bool FileID::ElfFileIdentifier(wasteful_vector<uint8_t>& identifier) {
return ElfFileIdentifierFromMappedFile(mapped_file.data(), identifier);
}
// This function is not ever called in an unsafe context, so it's OK
// These three functions are not ever called in an unsafe context, so it's OK
// to allocate memory and use libc.
static string bytes_to_hex_string(const uint8_t* bytes, size_t count) {
string result;
for (unsigned int idx = 0; idx < count; ++idx) {
char buf[3];
snprintf(buf, sizeof(buf), "%02X", bytes[idx]);
result.append(buf);
}
return result;
}
// static
string FileID::ConvertIdentifierToUUIDString(
const wasteful_vector<uint8_t>& identifier) {
@ -181,13 +191,13 @@ string FileID::ConvertIdentifierToUUIDString(
uint16_t* data3 = reinterpret_cast<uint16_t*>(identifier_swapped + 6);
*data3 = htons(*data3);
string result;
for (unsigned int idx = 0; idx < kMDGUIDSize; ++idx) {
char buf[3];
snprintf(buf, sizeof(buf), "%02X", identifier_swapped[idx]);
result.append(buf);
}
return result;
return bytes_to_hex_string(identifier_swapped, kMDGUIDSize);
}
// static
string FileID::ConvertIdentifierToString(
const wasteful_vector<uint8_t>& identifier) {
return bytes_to_hex_string(&identifier[0], identifier.size());
}
} // namespace google_breakpad

4
src/common/linux/file_id.h
View file

@ -73,6 +73,10 @@ class FileID {
static std::string ConvertIdentifierToUUIDString(
const wasteful_vector<uint8_t>& identifier);
// Convert the entire |identifier| data to a hex string.
static std::string ConvertIdentifierToString(
const wasteful_vector<uint8_t>& identifier);
private:
// Storage for the path specified
std::string path_;

17
src/common/linux/file_id_unittest.cc
View file

@ -319,3 +319,20 @@ TYPED_TEST(FileIDTest, UniqueHashes) {
EXPECT_NE(identifier_string_1, identifier_string_2);
}
TYPED_TEST(FileIDTest, ConvertIdentifierToString) {
const uint8_t kIdentifierBytes[] =
{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F};
const char* kExpected =
"000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
id_vector identifier(this->make_vector());
identifier.insert(identifier.end(),
kIdentifierBytes,
kIdentifierBytes + sizeof(kIdentifierBytes));
ASSERT_EQ(kExpected,
FileID::ConvertIdentifierToString(identifier));
}

8
src/common/module.cc
View file

@ -49,11 +49,13 @@ using std::hex;
Module::Module(const string &name, const string &os,
const string &architecture, const string &id) :
const string &architecture, const string &id,
const string &code_id /* = "" */) :
name_(name),
os_(os),
architecture_(architecture),
id_(id),
code_id_(code_id),
load_address_(0) { }
Module::~Module() {
@ -235,6 +237,10 @@ bool Module::Write(std::ostream &stream, SymbolData symbol_data) {
if (!stream.good())
return ReportError();
if (!code_id_.empty()) {
stream << "INFO CODE_ID " << code_id_ << endl;
}
if (symbol_data != ONLY_CFI) {
AssignSourceIds();

5
src/common/module.h
View file

@ -179,7 +179,7 @@ class Module {
// Create a new module with the given name, operating system,
// architecture, and ID string.
Module(const string &name, const string &os, const string &architecture,
const string &id);
const string &id, const string &code_id = "");
~Module();
// Set the module's load address to LOAD_ADDRESS; addresses given
@ -281,6 +281,7 @@ class Module {
string os() const { return os_; }
string architecture() const { return architecture_; }
string identifier() const { return id_; }
string code_identifier() const { return code_id_; }
private:
// Report an error that has occurred writing the symbol file, using
@ -293,7 +294,7 @@ class Module {
static bool WriteRuleMap(const RuleMap &rule_map, std::ostream &stream);
// Module header entries.
string name_, os_, architecture_, id_;
string name_, os_, architecture_, id_, code_id_;
// The module's nominal load address. Addresses for functions and
// lines are absolute, assuming the module is loaded at this

11
src/common/module_unittest.cc
View file

@ -64,6 +64,7 @@ static Module::Function *generate_duplicate_function(const string &name) {
#define MODULE_OS "os-name"
#define MODULE_ARCH "architecture"
#define MODULE_ID "id-string"
#define MODULE_CODE_ID "code-id-string"
TEST(Write, Header) {
stringstream s;
@ -74,6 +75,16 @@ TEST(Write, Header) {
contents.c_str());
}
TEST(Write, HeaderCodeId) {
stringstream s;
Module m(MODULE_NAME, MODULE_OS, MODULE_ARCH, MODULE_ID, MODULE_CODE_ID);
m.Write(s, ALL_SYMBOL_DATA);
string contents = s.str();
EXPECT_STREQ("MODULE os-name architecture id-string name with spaces\n"
"INFO CODE_ID code-id-string\n",
contents.c_str());
}
TEST(Write, OneLineFunc) {
stringstream s;
Module m(MODULE_NAME, MODULE_OS, MODULE_ARCH, MODULE_ID);