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Switch the Linux minidump writer to use MDCVInfoELF for CV data.

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This preserves full build ids in minidumps, which are useful for
tracking down the right version of system libraries from Linux
distributions.

The default build id produced by GNU binutils' ld is a 160-bit SHA-1
hash of some parts of the binary, which is exactly 20 bytes:
https://sourceware.org/binutils/docs-2.26/ld/Options.html#index-g_t_002d_002dbuild_002did-292

The bulk of the changes here are to change the signatures of the
FileID methods to use a wasteful_vector instead of raw pointers, since
build ids can be of arbitrary length.

The previous change that added support for this in the processor code
preserved the return value of `Minidump::debug_identifier()` as the
current `GUID+age` treatment for backwards-compatibility, and exposed
the full build id from `Minidump::code_identifier()`, which was
previously stubbed out for Linux dumps. This change keeps the debug ID
in the `dump_syms` output the same to match.

R=mark@chromium.org, thestig@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1688743002 .
This commit is contained in:
Ted Mielczarek
2016-04-05 09:34:20 -04:00
parent c1848484e1
commit 6c8f80aa8b
16 changed files with 460 additions and 227 deletions
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31
src/common/linux/file_id.h
View File

@@ -37,10 +37,15 @@
#include <string>
#include "common/linux/guid_creator.h"
#include "common/memory.h"
namespace google_breakpad {
static const size_t kMDGUIDSize = sizeof(MDGUID);
// GNU binutils' ld defaults to 'sha1', which is 160 bits == 20 bytes,
// so this is enough to fit that, which most binaries will use.
// This is just a sensible default for auto_wasteful_vector so most
// callers can get away with stack allocation.
static const size_t kDefaultBuildIdSize = 20;
class FileID {
public:
@@ -48,25 +53,25 @@ class FileID {
~FileID() {}
// Load the identifier for the elf file path specified in the constructor into
// |identifier|. Return false if the identifier could not be created for the
// file.
// |identifier|.
//
// The current implementation will look for a .note.gnu.build-id
// section and use that as the file id, otherwise it falls back to
// XORing the first 4096 bytes of the .text section to generate an identifier.
bool ElfFileIdentifier(uint8_t identifier[kMDGUIDSize]);
bool ElfFileIdentifier(wasteful_vector<uint8_t>& identifier);
// Load the identifier for the elf file mapped into memory at |base| into
// |identifier|. Return false if the identifier could not be created for the
// |identifier|. Return false if the identifier could not be created for this
// file.
static bool ElfFileIdentifierFromMappedFile(const void* base,
uint8_t identifier[kMDGUIDSize]);
static bool ElfFileIdentifierFromMappedFile(
const void* base,
wasteful_vector<uint8_t>& identifier);
// Convert the |identifier| data to a NULL terminated string. The string will
// be formatted as a UUID (e.g., 22F065BB-FC9C-49F7-80FE-26A7CEBD7BCE).
// The |buffer| should be at least 37 bytes long to receive all of the data
// and termination. Shorter buffers will contain truncated data.
static void ConvertIdentifierToString(const uint8_t identifier[kMDGUIDSize],
char* buffer, int buffer_length);
// Convert the |identifier| data to a string. The string will
// be formatted as a UUID in all uppercase without dashes.
// (e.g., 22F065BBFC9C49F780FE26A7CEBD7BCE).
static std::string ConvertIdentifierToUUIDString(
const wasteful_vector<uint8_t>& identifier);
private:
// Storage for the path specified