allow dump_syms to operate on contents in memory
dump_syms assumes it is operating on a file and can access a compliant file system. This change allows dump_syms to operate on the contents of a file that has already been read into memory. This is useful in a server context where the file does not exist on the local file system. Change-Id: Id63f115c2df287083d548dadd5ac487f97bde057 Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/3327644 Reviewed-by: Mark Mentovai <mark@chromium.org>
This commit is contained in:
Adam Duke
Mark Mentovai
parent
92a20b6504
commit
772cfc1db6
7 changed files with 97 additions and 230 deletions
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@ -1449,7 +1449,7 @@ bool MinidumpGenerator::WriteCVRecord(MDRawModule* module, int cpu_type,
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unsigned char identifier[16];
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bool result = false;
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if (in_memory) {
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MacFileUtilities::MachoID macho(module_path,
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MacFileUtilities::MachoID macho(
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reinterpret_cast<void*>(module->base_of_image),
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static_cast<size_t>(module->size_of_image));
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result = macho.UUIDCommand(cpu_type, CPU_SUBTYPE_MULTIPLE, identifier);
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@ -128,10 +128,11 @@ bool DumpSymbols::Read(const string& filename) {
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return false;
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}
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input_pathname_ = filename;
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from_disk_ = true;
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// Does this filename refer to a dSYM bundle?
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string contents_path = input_pathname_ + "/Contents/Resources/DWARF";
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string contents_path = filename + "/Contents/Resources/DWARF";
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string object_filename;
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if (S_ISDIR(st.st_mode) &&
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access(contents_path.c_str(), F_OK) == 0) {
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// If there's one file under Contents/Resources/DWARF then use that,
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@ -139,30 +140,31 @@ bool DumpSymbols::Read(const string& filename) {
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const vector<string> entries = list_directory(contents_path);
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if (entries.size() == 0) {
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fprintf(stderr, "Unable to find DWARF-bearing file in bundle: %s\n",
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input_pathname_.c_str());
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filename.c_str());
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return false;
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}
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if (entries.size() > 1) {
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fprintf(stderr, "Too many DWARF files in bundle: %s\n",
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input_pathname_.c_str());
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filename.c_str());
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return false;
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}
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object_filename_ = entries[0];
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object_filename = entries[0];
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} else {
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object_filename_ = input_pathname_;
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object_filename = filename;
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}
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// Read the file's contents into memory.
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bool read_ok = true;
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string error;
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if (stat(object_filename_.c_str(), &st) != -1) {
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FILE* f = fopen(object_filename_.c_str(), "rb");
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if (f) {
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contents_.reset(new uint8_t[st.st_size]);
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scoped_array<uint8_t> contents;
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off_t total = 0;
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if (stat(object_filename.c_str(), &st) != -1) {
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FILE* f = fopen(object_filename.c_str(), "rb");
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if (f) {
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contents.reset(new uint8_t[st.st_size]);
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while (total < st.st_size && !feof(f)) {
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size_t read = fread(&contents_[0] + total, 1, st.st_size - total, f);
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size_t read = fread(&contents[0] + total, 1, st.st_size - total, f);
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if (read == 0) {
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if (ferror(f)) {
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read_ok = false;
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@ -180,16 +182,22 @@ bool DumpSymbols::Read(const string& filename) {
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if (!read_ok) {
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fprintf(stderr, "Error reading object file: %s: %s\n",
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object_filename_.c_str(),
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error.c_str());
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object_filename.c_str(), error.c_str());
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return false;
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}
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return ReadData(contents.release(), total, object_filename);
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}
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bool DumpSymbols::ReadData(uint8_t* contents, size_t size,
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const std::string& filename) {
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contents_.reset(contents);
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size_ = size;
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object_filename_ = filename;
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// Get the list of object files present in the file.
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FatReader::Reporter fat_reporter(object_filename_);
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FatReader fat_reader(&fat_reporter);
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if (!fat_reader.Read(&contents_[0],
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st.st_size)) {
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if (!fat_reader.Read(contents_.get(), size)) {
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return false;
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}
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@ -283,7 +291,13 @@ SuperFatArch* DumpSymbols::FindBestMatchForArchitecture(
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}
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string DumpSymbols::Identifier() {
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FileID file_id(object_filename_.c_str());
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scoped_ptr<FileID> file_id;
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if (from_disk_) {
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file_id.reset(new FileID(object_filename_.c_str()));
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} else {
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file_id.reset(new FileID(contents_.get(), size_));
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}
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unsigned char identifier_bytes[16];
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scoped_ptr<Module> module;
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if (!selected_object_file_) {
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@ -292,7 +306,7 @@ string DumpSymbols::Identifier() {
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}
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cpu_type_t cpu_type = selected_object_file_->cputype;
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cpu_subtype_t cpu_subtype = selected_object_file_->cpusubtype;
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if (!file_id.MachoIdentifier(cpu_type, cpu_subtype, identifier_bytes)) {
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if (!file_id->MachoIdentifier(cpu_type, cpu_subtype, identifier_bytes)) {
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fprintf(stderr, "Unable to calculate UUID of mach-o binary %s!\n",
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object_filename_.c_str());
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return "";
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@ -57,21 +57,30 @@ class DumpSymbols {
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DumpSymbols(SymbolData symbol_data, bool handle_inter_cu_refs)
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: symbol_data_(symbol_data),
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handle_inter_cu_refs_(handle_inter_cu_refs),
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input_pathname_(),
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object_filename_(),
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contents_(),
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size_(0),
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from_disk_(false),
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object_files_(),
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selected_object_file_(),
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selected_object_name_() { }
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selected_object_name_() {}
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~DumpSymbols() {
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}
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// Prepare to read debugging information from |filename|. |filename| may be
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// the name of a universal binary, a Mach-O file, or a dSYM bundle
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// containing either of the above. On success, return true; if there is a
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// problem reading |filename|, report it and return false.
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// the name of a fat file, a Mach-O file, or a dSYM bundle containing either
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// of the above. On success, return true; if there is a problem reading
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// |filename|, report it and return false.
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bool Read(const std::string& filename);
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// Prepare to read debugging information from |contents|. |contents| is
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// expected to be the data obtained from reading a fat file, or a Mach-O file.
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// |filename| is used to determine the object filename in the generated
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// output; there will not be an attempt to open this file as the data
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// is already expected to be in memory. On success, return true; if there is a
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// problem reading |contents|, report it and return false.
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bool ReadData(uint8_t* contents, size_t size, const std::string& filename);
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// If this dumper's file includes an object file for |cpu_type| and
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// |cpu_subtype|, then select that object file for dumping, and return
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// true. Otherwise, return false, and leave this dumper's selected
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@ -162,19 +171,22 @@ class DumpSymbols {
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// Whether to handle references between compilation units.
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const bool handle_inter_cu_refs_;
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// The name of the file or bundle whose symbols this will dump.
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// This is the path given to Read, for use in error messages.
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std::string input_pathname_;
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// The name of the file this DumpSymbols will actually read debugging
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// information from. Normally, this is the same as input_pathname_, but if
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// filename refers to a dSYM bundle, then this is the resource file
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// within that bundle.
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// information from. If the filename passed to Read refers to a dSYM bundle,
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// then this is the resource file within that bundle.
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std::string object_filename_;
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// The complete contents of object_filename_, mapped into memory.
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scoped_array<uint8_t> contents_;
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// The size of contents_.
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size_t size_;
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// Indicates which entry point to DumpSymbols was used, i.e. Read vs ReadData.
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// This is used to indicate that downstream code paths can/should also read
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// from disk or not.
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bool from_disk_;
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// A vector of SuperFatArch structures describing the object files
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// object_filename_ contains. If object_filename_ refers to a fat binary,
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// this may have more than one element; if it refers to a Mach-O file, this
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@ -33,53 +33,41 @@
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//
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// Author: Dan Waylonis
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#include "common/mac/file_id.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "common/mac/file_id.h"
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#include "common/mac/macho_id.h"
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#include "common/scoped_ptr.h"
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using MacFileUtilities::MachoID;
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namespace google_breakpad {
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FileID::FileID(const char *path) {
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// Constructs a FileID given a path to a file
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FileID::FileID(const char* path) : memory_(nullptr), size_(0) {
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snprintf(path_, sizeof(path_), "%s", path);
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}
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bool FileID::FileIdentifier(unsigned char identifier[16]) {
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int fd = open(path_, O_RDONLY);
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if (fd == -1)
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return false;
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MD5Context md5;
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MD5Init(&md5);
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// Read 4k x 2 bytes at a time. This is faster than just 4k bytes, but
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// doesn't seem to be an unreasonable size for the stack.
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unsigned char buffer[4096 * 2];
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size_t buffer_size = sizeof(buffer);
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while ((buffer_size = read(fd, buffer, buffer_size) > 0)) {
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MD5Update(&md5, buffer, static_cast<unsigned>(buffer_size));
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}
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close(fd);
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MD5Final(identifier, &md5);
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return true;
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}
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// Constructs a FileID given the contents of a file and its size
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FileID::FileID(void* memory, size_t size)
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: path_(), memory_(memory), size_(size) {}
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bool FileID::MachoIdentifier(cpu_type_t cpu_type,
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cpu_subtype_t cpu_subtype,
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unsigned char identifier[16]) {
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MachoID macho(path_);
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if (macho.UUIDCommand(cpu_type, cpu_subtype, identifier))
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scoped_ptr<MachoID> macho;
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if (memory_) {
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macho.reset(new MachoID(memory_, size_));
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} else {
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macho.reset(new MachoID(path_));
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}
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if (macho->UUIDCommand(cpu_type, cpu_subtype, identifier))
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return true;
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return macho.MD5(cpu_type, cpu_subtype, identifier);
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return macho->MD5(cpu_type, cpu_subtype, identifier);
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}
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// static
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@ -36,19 +36,18 @@
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#include <limits.h>
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#include <mach/machine.h>
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#include <stddef.h>
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namespace google_breakpad {
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class FileID {
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public:
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FileID(const char *path);
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~FileID() {}
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// Constructs a FileID given a path to a file
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FileID(const char* path);
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// Load the identifier for the file path specified in the constructor into
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// |identifier|. Return false if the identifier could not be created for the
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// file.
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// The current implementation will return the MD5 hash of the file's bytes.
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bool FileIdentifier(unsigned char identifier[16]);
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// Constructs a FileID given the contents of a file and its size.
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FileID(void* memory, size_t size);
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~FileID() {}
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// Treat the file as a mach-o file that will contain one or more archicture.
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// Accepted values for |cpu_type| and |cpu_subtype| (e.g., CPU_TYPE_X86 or
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@ -74,6 +73,16 @@ class FileID {
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private:
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// Storage for the path specified
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char path_[PATH_MAX];
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// Storage for contents of a file if this instance is used to operate on in
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// memory file data rather than directly from a filesystem. If memory_ is
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// null, the file represented by path_ will be opened/read. If memory_ is
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// non-null, it is assumed to contain valid data, and no file operations will
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// occur.
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void* memory_;
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// Size of memory_
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size_t size_;
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};
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} // namespace google_breakpad
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@ -37,11 +37,7 @@
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#include <fcntl.h>
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#include <mach-o/loader.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "common/mac/macho_id.h"
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#include "common/mac/macho_walker.h"
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@ -54,73 +50,18 @@ using google_breakpad::MD5Update;
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using google_breakpad::MD5Final;
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MachoID::MachoID(const char* path)
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: memory_(0),
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memory_size_(0),
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crc_(0),
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md5_context_(),
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update_function_(NULL) {
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: memory_(0), memory_size_(0), md5_context_(), update_function_(NULL) {
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snprintf(path_, sizeof(path_), "%s", path);
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}
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MachoID::MachoID(const char* path, void* memory, size_t size)
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: memory_(memory),
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MachoID::MachoID(void* memory, size_t size)
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: path_(),
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memory_(memory),
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memory_size_(size),
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crc_(0),
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md5_context_(),
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update_function_(NULL) {
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snprintf(path_, sizeof(path_), "%s", path);
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}
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update_function_(NULL) {}
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MachoID::~MachoID() {
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}
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// The CRC info is from http://en.wikipedia.org/wiki/Adler-32
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// With optimizations from http://www.zlib.net/
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// The largest prime smaller than 65536
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#define MOD_ADLER 65521
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// MAX_BLOCK is the largest n such that 255n(n+1)/2 + (n+1)(MAX_BLOCK-1) <= 2^32-1
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#define MAX_BLOCK 5552
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void MachoID::UpdateCRC(unsigned char* bytes, size_t size) {
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// Unrolled loops for summing
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#define DO1(buf,i) {sum1 += (buf)[i]; sum2 += sum1;}
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#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);
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#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);
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#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);
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#define DO16(buf) DO8(buf,0); DO8(buf,8);
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// Split up the crc
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uint32_t sum1 = crc_ & 0xFFFF;
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uint32_t sum2 = (crc_ >> 16) & 0xFFFF;
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// Do large blocks
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while (size >= MAX_BLOCK) {
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size -= MAX_BLOCK;
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int block_count = MAX_BLOCK / 16;
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do {
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DO16(bytes);
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bytes += 16;
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} while (--block_count);
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sum1 %= MOD_ADLER;
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sum2 %= MOD_ADLER;
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}
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// Do remaining bytes
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if (size) {
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while (size >= 16) {
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size -= 16;
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DO16(bytes);
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bytes += 16;
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}
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while (size--) {
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sum1 += *bytes++;
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sum2 += sum1;
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}
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sum1 %= MOD_ADLER;
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sum2 %= MOD_ADLER;
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crc_ = (sum2 << 16) | sum1;
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}
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}
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MachoID::~MachoID() {}
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void MachoID::UpdateMD5(unsigned char* bytes, size_t size) {
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MD5Update(&md5_context_, bytes, static_cast<unsigned>(size));
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@ -169,59 +110,6 @@ bool MachoID::UUIDCommand(cpu_type_t cpu_type,
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return false;
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}
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bool MachoID::IDCommand(cpu_type_t cpu_type,
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cpu_subtype_t cpu_subtype,
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unsigned char identifier[16]) {
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struct dylib_command dylib_cmd;
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dylib_cmd.cmd = 0;
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if (!WalkHeader(cpu_type, cpu_subtype, IDWalkerCB, &dylib_cmd))
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return false;
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// If we found the command, we'll have initialized the dylib_command
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// structure
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if (dylib_cmd.cmd == LC_ID_DYLIB) {
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// Take the hashed filename, version, and compatability version bytes
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// to form the first 12 bytes, pad the rest with zeros
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// create a crude hash of the filename to generate the first 4 bytes
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identifier[0] = 0;
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identifier[1] = 0;
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identifier[2] = 0;
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identifier[3] = 0;
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for (int j = 0, i = (int)strlen(path_)-1; i>=0 && path_[i]!='/'; ++j, --i) {
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identifier[j%4] += path_[i];
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}
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identifier[4] = (dylib_cmd.dylib.current_version >> 24) & 0xFF;
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identifier[5] = (dylib_cmd.dylib.current_version >> 16) & 0xFF;
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identifier[6] = (dylib_cmd.dylib.current_version >> 8) & 0xFF;
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identifier[7] = dylib_cmd.dylib.current_version & 0xFF;
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identifier[8] = (dylib_cmd.dylib.compatibility_version >> 24) & 0xFF;
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identifier[9] = (dylib_cmd.dylib.compatibility_version >> 16) & 0xFF;
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identifier[10] = (dylib_cmd.dylib.compatibility_version >> 8) & 0xFF;
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identifier[11] = dylib_cmd.dylib.compatibility_version & 0xFF;
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identifier[12] = (cpu_type >> 24) & 0xFF;
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identifier[13] = (cpu_type >> 16) & 0xFF;
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identifier[14] = (cpu_type >> 8) & 0xFF;
|
||||
identifier[15] = cpu_type & 0xFF;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
uint32_t MachoID::Adler32(cpu_type_t cpu_type, cpu_subtype_t cpu_subtype) {
|
||||
update_function_ = &MachoID::UpdateCRC;
|
||||
crc_ = 0;
|
||||
|
||||
if (!WalkHeader(cpu_type, cpu_subtype, WalkerCB, this))
|
||||
return 0;
|
||||
|
||||
return crc_;
|
||||
}
|
||||
|
||||
bool MachoID::MD5(cpu_type_t cpu_type, cpu_subtype_t cpu_subtype, unsigned char identifier[16]) {
|
||||
update_function_ = &MachoID::UpdateMD5;
|
||||
|
||||
|
|
@ -346,24 +234,4 @@ bool MachoID::UUIDWalkerCB(MachoWalker* walker, load_command* cmd, off_t offset,
|
|||
// Continue processing
|
||||
return true;
|
||||
}
|
||||
|
||||
// static
|
||||
bool MachoID::IDWalkerCB(MachoWalker* walker, load_command* cmd, off_t offset,
|
||||
bool swap, void* context) {
|
||||
if (cmd->cmd == LC_ID_DYLIB) {
|
||||
struct dylib_command* dylib_cmd = (struct dylib_command*)context;
|
||||
|
||||
if (!walker->ReadBytes(dylib_cmd, sizeof(struct dylib_command), offset))
|
||||
return false;
|
||||
|
||||
if (swap)
|
||||
breakpad_swap_dylib_command(dylib_cmd);
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
// Continue processing
|
||||
return true;
|
||||
}
|
||||
|
||||
} // namespace MacFileUtilities
|
||||
|
|
|
|||
|
|
@ -46,7 +46,7 @@ namespace MacFileUtilities {
|
|||
class MachoID {
|
||||
public:
|
||||
MachoID(const char* path);
|
||||
MachoID(const char* path, void* memory, size_t size);
|
||||
MachoID(void* memory, size_t size);
|
||||
~MachoID();
|
||||
|
||||
// For the given |cpu_type| and |cpu_subtype|, return a UUID from the LC_UUID
|
||||
|
|
@ -56,19 +56,6 @@ class MachoID {
|
|||
cpu_subtype_t cpu_subtype,
|
||||
unsigned char identifier[16]);
|
||||
|
||||
// For the given |cpu_type| and |cpu_subtype|, return a UUID from the
|
||||
// LC_ID_DYLIB command.
|
||||
// Return false if there isn't a LC_ID_DYLIB command.
|
||||
bool IDCommand(cpu_type_t cpu_type,
|
||||
cpu_subtype_t cpu_subtype,
|
||||
unsigned char identifier[16]);
|
||||
|
||||
// For the given |cpu_type| and |cpu_subtype|, return the Adler32 CRC for the
|
||||
// mach-o data segment(s).
|
||||
// Return 0 on error (e.g., if the file is not a mach-o file)
|
||||
uint32_t Adler32(cpu_type_t cpu_type,
|
||||
cpu_subtype_t cpu_subtype);
|
||||
|
||||
// For the given |cpu_type|, and |cpu_subtype| return the MD5 for the mach-o
|
||||
// data segment(s).
|
||||
// Return true on success, false otherwise
|
||||
|
|
@ -80,10 +67,6 @@ class MachoID {
|
|||
// Signature of class member function to be called with data read from file
|
||||
typedef void (MachoID::*UpdateFunction)(unsigned char* bytes, size_t size);
|
||||
|
||||
// Update the CRC value by examining |size| |bytes| and applying the algorithm
|
||||
// to each byte.
|
||||
void UpdateCRC(unsigned char* bytes, size_t size);
|
||||
|
||||
// Update the MD5 value by examining |size| |bytes| and applying the algorithm
|
||||
// to each byte.
|
||||
void UpdateMD5(unsigned char* bytes, size_t size);
|
||||
|
|
@ -103,10 +86,6 @@ class MachoID {
|
|||
static bool UUIDWalkerCB(MachoWalker* walker, load_command* cmd, off_t offset,
|
||||
bool swap, void* context);
|
||||
|
||||
// The callback from the MachoWalker for LC_ID_DYLIB
|
||||
static bool IDWalkerCB(MachoWalker* walker, load_command* cmd, off_t offset,
|
||||
bool swap, void* context);
|
||||
|
||||
// File path
|
||||
char path_[PATH_MAX];
|
||||
|
||||
|
|
@ -116,9 +95,6 @@ class MachoID {
|
|||
// Size of the memory region
|
||||
size_t memory_size_;
|
||||
|
||||
// The current crc value
|
||||
uint32_t crc_;
|
||||
|
||||
// The MD5 context
|
||||
google_breakpad::MD5Context md5_context_;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue