// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This source set defines shared expectations for:
// 1. The packed-data format used to pass information from chrome.dll
// to chrome_elf.dll across restarts.
// 2. The APIs exported by chrome_elf.dll to share logs of module load attempts.
#ifndef CHROME_CHROME_ELF_THIRD_PARTY_DLLS_PACKED_LIST_FORMAT_H_
#define CHROME_CHROME_ELF_THIRD_PARTY_DLLS_PACKED_LIST_FORMAT_H_
#include <stdint.h>
#include <array>
#include <string>
#include "chrome/chrome_elf/sha1/sha1.h"
namespace third_party_dlls {
// -----------------------------------------------------------------------------
// This defines the expected format for a packed list of third-party modules.
// - At offset 0: {PackedListMetadata}
// - Immediately following: {Array of PackedListModule}
// - Anything else can be stored in the rest of the file.
//
// - It's a requirement that the list be packed little-endian and also that
// 32-bit alignment == 64-bit alignment (so no handling required).
// - It's also required that the array be *sorted*. First by basename hash,
// second by code_id hash (there can be multiple of the same basename hash).
// -----------------------------------------------------------------------------
// Subkey relative to install_static::GetRegistryPath().
extern const wchar_t kThirdPartyRegKeyName[];
// Subkey value of type REG_SZ to hold a full path to a packed-list file.
extern const wchar_t kBlFilePathRegValue[];
enum PackedListVersion : uint32_t {
kInitialVersion = 1,
kCurrent = kInitialVersion,
kUnsupported
};
struct PackedListMetadata {
// The version of the packed list format. This should always be ordered
// first for backward compatibility purposes.
PackedListVersion version;
// The number of PackedListModule elements that follows the metadata in
// the packed list.
uint32_t module_count;
};
struct PackedListModule {
// SHA1 of lowercase, UTF-8 basename (no path).
elf_sha1::Digest basename_hash;
// Code ID. Get the formatted string via GetFingerprintString(), then SHA1.
elf_sha1::Digest code_id_hash;
// A timestamp used for tracking "last attempted load". Used to manage
// lifetime of entries in the local caches.
uint32_t time_date_stamp;
};
// Centralized utility function that takes required PE fingerprint data and
// returns a formatted fingerprint string. The caller should SHA1 hash the
// returned string.
// - This string is generated by formatting the FileHeader.TimeDateStamp
// and OptionalHeader.SizeOfImage with the formatting string %08X%x.
// - To be used for PackedListModule.code_id_hash, IsModuleListed() and logging
// APIs.
std::string GetFingerprintString(uint32_t time_data_stamp, uint32_t image_size);
// These structs are directly written to a storage type. Therefore the padding
// should be consistent across compilations.
static_assert(sizeof(PackedListMetadata) == 8,
"The actual padding of the PackedListMetadata struct doesn't"
"match the expected padding");
static_assert(sizeof(PackedListModule) == 44,
"The actual padding of the PackedListModule struct doesn't match"
"the expected padding");
} // namespace third_party_dlls
#endif // CHROME_CHROME_ELF_THIRD_PARTY_DLLS_PACKED_LIST_FORMAT_H_
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