You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1693 lines
61 KiB
1693 lines
61 KiB
/*
|
|
* Copyright (C) 2008 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
/*
|
|
* Read-only access to Zip archives, with minimal heap allocation.
|
|
*/
|
|
|
|
#define LOG_TAG "ziparchive"
|
|
|
|
#include "ziparchive/zip_archive.h"
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <inttypes.h>
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include <memory>
|
|
#include <optional>
|
|
#include <span>
|
|
#include <vector>
|
|
|
|
#if defined(__APPLE__)
|
|
#define lseek64 lseek
|
|
#endif
|
|
|
|
#if defined(__BIONIC__)
|
|
#include <android/fdsan.h>
|
|
#endif
|
|
|
|
#include <android-base/file.h>
|
|
#include <android-base/logging.h>
|
|
#include <android-base/macros.h> // TEMP_FAILURE_RETRY may or may not be in unistd
|
|
#include <android-base/mapped_file.h>
|
|
#include <android-base/memory.h>
|
|
#include <android-base/strings.h>
|
|
#include <android-base/utf8.h>
|
|
#include <log/log.h>
|
|
|
|
#include "entry_name_utils-inl.h"
|
|
#include "incfs_support/signal_handling.h"
|
|
#include "incfs_support/util.h"
|
|
#include "zip_archive_common.h"
|
|
#include "zip_archive_private.h"
|
|
#include "zlib.h"
|
|
|
|
// Used to turn on crc checks - verify that the content CRC matches the values
|
|
// specified in the local file header and the central directory.
|
|
static constexpr bool kCrcChecksEnabled = false;
|
|
|
|
// The maximum number of bytes to scan backwards for the EOCD start.
|
|
static const uint32_t kMaxEOCDSearch = kMaxCommentLen + sizeof(EocdRecord);
|
|
|
|
// Set a reasonable cap (256 GiB) for the zip file size. So the data is always valid when
|
|
// we parse the fields in cd or local headers as 64 bits signed integers.
|
|
static constexpr uint64_t kMaxFileLength = 256 * static_cast<uint64_t>(1u << 30u);
|
|
|
|
/*
|
|
* A Read-only Zip archive.
|
|
*
|
|
* We want "open" and "find entry by name" to be fast operations, and
|
|
* we want to use as little memory as possible. We memory-map the zip
|
|
* central directory, and load a hash table with pointers to the filenames
|
|
* (which aren't null-terminated). The other fields are at a fixed offset
|
|
* from the filename, so we don't need to extract those (but we do need
|
|
* to byte-read and endian-swap them every time we want them).
|
|
*
|
|
* It's possible that somebody has handed us a massive (~1GB) zip archive,
|
|
* so we can't expect to mmap the entire file.
|
|
*
|
|
* To speed comparisons when doing a lookup by name, we could make the mapping
|
|
* "private" (copy-on-write) and null-terminate the filenames after verifying
|
|
* the record structure. However, this requires a private mapping of
|
|
* every page that the Central Directory touches. Easier to tuck a copy
|
|
* of the string length into the hash table entry.
|
|
*/
|
|
|
|
#if defined(__BIONIC__)
|
|
uint64_t GetOwnerTag(const ZipArchive* archive) {
|
|
return android_fdsan_create_owner_tag(ANDROID_FDSAN_OWNER_TYPE_ZIPARCHIVE,
|
|
reinterpret_cast<uint64_t>(archive));
|
|
}
|
|
#endif
|
|
|
|
ZipArchive::ZipArchive(MappedZipFile&& map, bool assume_ownership)
|
|
: mapped_zip(map),
|
|
close_file(assume_ownership),
|
|
directory_offset(0),
|
|
central_directory(),
|
|
directory_map(),
|
|
num_entries(0) {
|
|
#if defined(__BIONIC__)
|
|
if (assume_ownership) {
|
|
CHECK(mapped_zip.HasFd());
|
|
android_fdsan_exchange_owner_tag(mapped_zip.GetFileDescriptor(), 0, GetOwnerTag(this));
|
|
}
|
|
#endif
|
|
}
|
|
|
|
ZipArchive::ZipArchive(const void* address, size_t length)
|
|
: mapped_zip(address, length),
|
|
close_file(false),
|
|
directory_offset(0),
|
|
central_directory(),
|
|
directory_map(),
|
|
num_entries(0) {}
|
|
|
|
ZipArchive::~ZipArchive() {
|
|
if (close_file && mapped_zip.GetFileDescriptor() >= 0) {
|
|
#if defined(__BIONIC__)
|
|
android_fdsan_close_with_tag(mapped_zip.GetFileDescriptor(), GetOwnerTag(this));
|
|
#else
|
|
close(mapped_zip.GetFileDescriptor());
|
|
#endif
|
|
}
|
|
}
|
|
|
|
struct CentralDirectoryInfo {
|
|
uint64_t num_records;
|
|
// The size of the central directory (in bytes).
|
|
uint64_t cd_size;
|
|
// The offset of the start of the central directory, relative
|
|
// to the start of the file.
|
|
uint64_t cd_start_offset;
|
|
};
|
|
|
|
// Reads |T| at |readPtr| and increments |readPtr|. Returns std::nullopt if the boundary check
|
|
// fails.
|
|
template <typename T>
|
|
static std::optional<T> TryConsumeUnaligned(uint8_t** readPtr, const uint8_t* bufStart,
|
|
size_t bufSize) {
|
|
if (bufSize < sizeof(T) || *readPtr - bufStart > bufSize - sizeof(T)) {
|
|
ALOGW("Zip: %zu byte read exceeds the boundary of allocated buf, offset %zu, bufSize %zu",
|
|
sizeof(T), *readPtr - bufStart, bufSize);
|
|
return std::nullopt;
|
|
}
|
|
return ConsumeUnaligned<T>(readPtr);
|
|
}
|
|
|
|
static ZipError FindCentralDirectoryInfoForZip64(const char* debugFileName, ZipArchive* archive,
|
|
off64_t eocdOffset, CentralDirectoryInfo* cdInfo) {
|
|
if (eocdOffset <= sizeof(Zip64EocdLocator)) {
|
|
ALOGW("Zip: %s: Not enough space for zip64 eocd locator", debugFileName);
|
|
return kInvalidFile;
|
|
}
|
|
// We expect to find the zip64 eocd locator immediately before the zip eocd.
|
|
const int64_t locatorOffset = eocdOffset - sizeof(Zip64EocdLocator);
|
|
Zip64EocdLocator zip64EocdLocator{};
|
|
if (!archive->mapped_zip.ReadAtOffset(reinterpret_cast<uint8_t*>((&zip64EocdLocator)),
|
|
sizeof(Zip64EocdLocator), locatorOffset)) {
|
|
ALOGW("Zip: %s: Read %zu from offset %" PRId64 " failed %s", debugFileName,
|
|
sizeof(Zip64EocdLocator), locatorOffset, debugFileName);
|
|
return kIoError;
|
|
}
|
|
|
|
if (zip64EocdLocator.locator_signature != Zip64EocdLocator::kSignature) {
|
|
ALOGW("Zip: %s: Zip64 eocd locator signature not found at offset %" PRId64, debugFileName,
|
|
locatorOffset);
|
|
return kInvalidFile;
|
|
}
|
|
|
|
const int64_t zip64EocdOffset = zip64EocdLocator.zip64_eocd_offset;
|
|
if (locatorOffset <= sizeof(Zip64EocdRecord) ||
|
|
zip64EocdOffset > locatorOffset - sizeof(Zip64EocdRecord)) {
|
|
ALOGW("Zip: %s: Bad zip64 eocd offset %" PRId64 ", eocd locator offset %" PRId64, debugFileName,
|
|
zip64EocdOffset, locatorOffset);
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
Zip64EocdRecord zip64EocdRecord{};
|
|
if (!archive->mapped_zip.ReadAtOffset(reinterpret_cast<uint8_t*>(&zip64EocdRecord),
|
|
sizeof(Zip64EocdRecord), zip64EocdOffset)) {
|
|
ALOGW("Zip: %s: read %zu from offset %" PRId64 " failed %s", debugFileName,
|
|
sizeof(Zip64EocdLocator), zip64EocdOffset, debugFileName);
|
|
return kIoError;
|
|
}
|
|
|
|
if (zip64EocdRecord.record_signature != Zip64EocdRecord::kSignature) {
|
|
ALOGW("Zip: %s: Zip64 eocd record signature not found at offset %" PRId64, debugFileName,
|
|
zip64EocdOffset);
|
|
return kInvalidFile;
|
|
}
|
|
|
|
if (zip64EocdOffset <= zip64EocdRecord.cd_size ||
|
|
zip64EocdRecord.cd_start_offset > zip64EocdOffset - zip64EocdRecord.cd_size) {
|
|
ALOGW("Zip: %s: Bad offset for zip64 central directory. cd offset %" PRIu64 ", cd size %" PRIu64
|
|
", zip64 eocd offset %" PRIu64,
|
|
debugFileName, zip64EocdRecord.cd_start_offset, zip64EocdRecord.cd_size, zip64EocdOffset);
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
*cdInfo = {.num_records = zip64EocdRecord.num_records,
|
|
.cd_size = zip64EocdRecord.cd_size,
|
|
.cd_start_offset = zip64EocdRecord.cd_start_offset};
|
|
|
|
return kSuccess;
|
|
}
|
|
|
|
static ZipError FindCentralDirectoryInfo(const char* debug_file_name,
|
|
ZipArchive* archive,
|
|
off64_t file_length,
|
|
std::span<uint8_t> scan_buffer,
|
|
CentralDirectoryInfo* cdInfo) {
|
|
const auto read_amount = static_cast<uint32_t>(scan_buffer.size());
|
|
const off64_t search_start = file_length - read_amount;
|
|
|
|
if (!archive->mapped_zip.ReadAtOffset(scan_buffer.data(), read_amount, search_start)) {
|
|
ALOGE("Zip: read %" PRId64 " from offset %" PRId64 " failed", static_cast<int64_t>(read_amount),
|
|
static_cast<int64_t>(search_start));
|
|
return kIoError;
|
|
}
|
|
|
|
/*
|
|
* Scan backward for the EOCD magic. In an archive without a trailing
|
|
* comment, we'll find it on the first try. (We may want to consider
|
|
* doing an initial minimal read; if we don't find it, retry with a
|
|
* second read as above.)
|
|
*/
|
|
CHECK_LE(read_amount, std::numeric_limits<int32_t>::max());
|
|
int32_t i = read_amount - sizeof(EocdRecord);
|
|
for (; i >= 0; i--) {
|
|
if (scan_buffer[i] == 0x50) {
|
|
uint32_t* sig_addr = reinterpret_cast<uint32_t*>(&scan_buffer[i]);
|
|
if (android::base::get_unaligned<uint32_t>(sig_addr) == EocdRecord::kSignature) {
|
|
ALOGV("+++ Found EOCD at buf+%d", i);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (i < 0) {
|
|
ALOGD("Zip: EOCD not found, %s is not zip", debug_file_name);
|
|
return kInvalidFile;
|
|
}
|
|
|
|
const off64_t eocd_offset = search_start + i;
|
|
auto eocd = reinterpret_cast<const EocdRecord*>(scan_buffer.data() + i);
|
|
/*
|
|
* Verify that there's no trailing space at the end of the central directory
|
|
* and its comment.
|
|
*/
|
|
const off64_t calculated_length = eocd_offset + sizeof(EocdRecord) + eocd->comment_length;
|
|
if (calculated_length != file_length) {
|
|
ALOGW("Zip: %" PRId64 " extraneous bytes at the end of the central directory",
|
|
static_cast<int64_t>(file_length - calculated_length));
|
|
return kInvalidFile;
|
|
}
|
|
|
|
// One of the field is 0xFFFFFFFF, look for the zip64 EOCD instead.
|
|
if (eocd->cd_size == UINT32_MAX || eocd->cd_start_offset == UINT32_MAX) {
|
|
ALOGV("Looking for the zip64 EOCD, cd_size: %" PRIu32 "cd_start_offset: %" PRId32,
|
|
eocd->cd_size, eocd->cd_start_offset);
|
|
return FindCentralDirectoryInfoForZip64(debug_file_name, archive, eocd_offset, cdInfo);
|
|
}
|
|
|
|
/*
|
|
* Grab the CD offset and size, and the number of entries in the
|
|
* archive and verify that they look reasonable.
|
|
*/
|
|
if (static_cast<off64_t>(eocd->cd_start_offset) + eocd->cd_size > eocd_offset) {
|
|
ALOGW("Zip: bad offsets (dir %" PRIu32 ", size %" PRIu32 ", eocd %" PRId64 ")",
|
|
eocd->cd_start_offset, eocd->cd_size, static_cast<int64_t>(eocd_offset));
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
*cdInfo = {.num_records = eocd->num_records,
|
|
.cd_size = eocd->cd_size,
|
|
.cd_start_offset = eocd->cd_start_offset};
|
|
return kSuccess;
|
|
}
|
|
|
|
/*
|
|
* Find the zip Central Directory and memory-map it.
|
|
*
|
|
* On success, returns kSuccess after populating fields from the EOCD area:
|
|
* directory_offset
|
|
* directory_ptr
|
|
* num_entries
|
|
*/
|
|
static ZipError MapCentralDirectory(const char* debug_file_name, ZipArchive* archive) {
|
|
// Test file length. We use lseek64 to make sure the file is small enough to be a zip file.
|
|
off64_t file_length = archive->mapped_zip.GetFileLength();
|
|
if (file_length == -1) {
|
|
return kInvalidFile;
|
|
}
|
|
|
|
if (file_length > kMaxFileLength) {
|
|
ALOGV("Zip: zip file too long %" PRId64, static_cast<int64_t>(file_length));
|
|
return kInvalidFile;
|
|
}
|
|
|
|
if (file_length < static_cast<off64_t>(sizeof(EocdRecord))) {
|
|
ALOGV("Zip: length %" PRId64 " is too small to be zip", static_cast<int64_t>(file_length));
|
|
return kInvalidFile;
|
|
}
|
|
|
|
/*
|
|
* Perform the traditional EOCD snipe hunt.
|
|
*
|
|
* We're searching for the End of Central Directory magic number,
|
|
* which appears at the start of the EOCD block. It's followed by
|
|
* 18 bytes of EOCD stuff and up to 64KB of archive comment. We
|
|
* need to read the last part of the file into a buffer, dig through
|
|
* it to find the magic number, parse some values out, and use those
|
|
* to determine the extent of the CD.
|
|
*
|
|
* We start by pulling in the last part of the file.
|
|
*/
|
|
uint32_t read_amount = kMaxEOCDSearch;
|
|
if (file_length < read_amount) {
|
|
read_amount = static_cast<uint32_t>(file_length);
|
|
}
|
|
|
|
CentralDirectoryInfo cdInfo = {};
|
|
std::vector<uint8_t> scan_buffer(read_amount);
|
|
|
|
SCOPED_SIGBUS_HANDLER({
|
|
incfs::util::clearAndFree(scan_buffer);
|
|
return kIoError;
|
|
});
|
|
|
|
if (auto result = FindCentralDirectoryInfo(debug_file_name, archive,
|
|
file_length, scan_buffer, &cdInfo);
|
|
result != kSuccess) {
|
|
return result;
|
|
}
|
|
|
|
scan_buffer.clear();
|
|
|
|
if (cdInfo.num_records == 0) {
|
|
#if defined(__ANDROID__)
|
|
ALOGW("Zip: empty archive?");
|
|
#endif
|
|
return kEmptyArchive;
|
|
}
|
|
|
|
if (cdInfo.cd_size >= SIZE_MAX) {
|
|
ALOGW("Zip: The size of central directory doesn't fit in range of size_t: %" PRIu64,
|
|
cdInfo.cd_size);
|
|
return kInvalidFile;
|
|
}
|
|
|
|
ALOGV("+++ num_entries=%" PRIu64 " dir_size=%" PRIu64 " dir_offset=%" PRIu64, cdInfo.num_records,
|
|
cdInfo.cd_size, cdInfo.cd_start_offset);
|
|
|
|
// It all looks good. Create a mapping for the CD, and set the fields in archive.
|
|
if (!archive->InitializeCentralDirectory(static_cast<off64_t>(cdInfo.cd_start_offset),
|
|
static_cast<size_t>(cdInfo.cd_size))) {
|
|
return kMmapFailed;
|
|
}
|
|
|
|
archive->num_entries = cdInfo.num_records;
|
|
archive->directory_offset = cdInfo.cd_start_offset;
|
|
|
|
return kSuccess;
|
|
}
|
|
|
|
static ZipError ParseZip64ExtendedInfoInExtraField(
|
|
const uint8_t* extraFieldStart, uint16_t extraFieldLength, uint32_t zip32UncompressedSize,
|
|
uint32_t zip32CompressedSize, std::optional<uint32_t> zip32LocalFileHeaderOffset,
|
|
Zip64ExtendedInfo* zip64Info) {
|
|
if (extraFieldLength <= 4) {
|
|
ALOGW("Zip: Extra field isn't large enough to hold zip64 info, size %" PRIu16,
|
|
extraFieldLength);
|
|
return kInvalidFile;
|
|
}
|
|
|
|
// Each header MUST consist of:
|
|
// Header ID - 2 bytes
|
|
// Data Size - 2 bytes
|
|
uint16_t offset = 0;
|
|
while (offset < extraFieldLength - 4) {
|
|
auto readPtr = const_cast<uint8_t*>(extraFieldStart + offset);
|
|
auto headerId = ConsumeUnaligned<uint16_t>(&readPtr);
|
|
auto dataSize = ConsumeUnaligned<uint16_t>(&readPtr);
|
|
|
|
offset += 4;
|
|
if (dataSize > extraFieldLength - offset) {
|
|
ALOGW("Zip: Data size exceeds the boundary of extra field, data size %" PRIu16, dataSize);
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
// Skip the other types of extensible data fields. Details in
|
|
// https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT section 4.5
|
|
if (headerId != Zip64ExtendedInfo::kHeaderId) {
|
|
offset += dataSize;
|
|
continue;
|
|
}
|
|
// Layout for Zip64 extended info (not include first 4 bytes of header)
|
|
// Original
|
|
// Size 8 bytes Original uncompressed file size
|
|
|
|
// Compressed
|
|
// Size 8 bytes Size of compressed data
|
|
|
|
// Relative Header
|
|
// Offset 8 bytes Offset of local header record
|
|
|
|
// Disk Start
|
|
// Number 4 bytes Number of the disk on which
|
|
// this file starts
|
|
if (dataSize == 8 * 3 + 4) {
|
|
ALOGW(
|
|
"Zip: Found `Disk Start Number` field in extra block. Ignoring it.");
|
|
dataSize -= 4;
|
|
}
|
|
// Sometimes, only a subset of {uncompressed size, compressed size, relative
|
|
// header offset} is presents. but golang's zip writer will write out all
|
|
// 3 even if only 1 is necessary. We should parse all 3 fields if they are
|
|
// there.
|
|
const bool completeField = dataSize == 8 * 3;
|
|
|
|
std::optional<uint64_t> uncompressedFileSize;
|
|
std::optional<uint64_t> compressedFileSize;
|
|
std::optional<uint64_t> localHeaderOffset;
|
|
if (zip32UncompressedSize == UINT32_MAX || completeField) {
|
|
uncompressedFileSize = TryConsumeUnaligned<uint64_t>(
|
|
&readPtr, extraFieldStart, extraFieldLength);
|
|
if (!uncompressedFileSize.has_value()) return kInvalidOffset;
|
|
}
|
|
if (zip32CompressedSize == UINT32_MAX || completeField) {
|
|
compressedFileSize = TryConsumeUnaligned<uint64_t>(
|
|
&readPtr, extraFieldStart, extraFieldLength);
|
|
if (!compressedFileSize.has_value()) return kInvalidOffset;
|
|
}
|
|
if (zip32LocalFileHeaderOffset == UINT32_MAX || completeField) {
|
|
localHeaderOffset = TryConsumeUnaligned<uint64_t>(
|
|
&readPtr, extraFieldStart, extraFieldLength);
|
|
if (!localHeaderOffset.has_value()) return kInvalidOffset;
|
|
}
|
|
|
|
// calculate how many bytes we read after the data size field.
|
|
size_t bytesRead = readPtr - (extraFieldStart + offset);
|
|
if (bytesRead == 0) {
|
|
ALOGW("Zip: Data size should not be 0 in zip64 extended field");
|
|
return kInvalidFile;
|
|
}
|
|
|
|
if (dataSize != bytesRead) {
|
|
auto localOffsetString = zip32LocalFileHeaderOffset.has_value()
|
|
? std::to_string(zip32LocalFileHeaderOffset.value())
|
|
: "missing";
|
|
ALOGW("Zip: Invalid data size in zip64 extended field, expect %zu , get %" PRIu16
|
|
", uncompressed size %" PRIu32 ", compressed size %" PRIu32 ", local header offset %s",
|
|
bytesRead, dataSize, zip32UncompressedSize, zip32CompressedSize,
|
|
localOffsetString.c_str());
|
|
return kInvalidFile;
|
|
}
|
|
|
|
zip64Info->uncompressed_file_size = uncompressedFileSize;
|
|
zip64Info->compressed_file_size = compressedFileSize;
|
|
zip64Info->local_header_offset = localHeaderOffset;
|
|
return kSuccess;
|
|
}
|
|
|
|
ALOGW("Zip: zip64 extended info isn't found in the extra field.");
|
|
return kInvalidFile;
|
|
}
|
|
|
|
/*
|
|
* Parses the Zip archive's Central Directory. Allocates and populates the
|
|
* hash table.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static ZipError ParseZipArchive(ZipArchive* archive) {
|
|
SCOPED_SIGBUS_HANDLER(return kIoError);
|
|
|
|
const uint8_t* const cd_ptr = archive->central_directory.GetBasePtr();
|
|
const size_t cd_length = archive->central_directory.GetMapLength();
|
|
const uint64_t num_entries = archive->num_entries;
|
|
|
|
if (num_entries <= UINT16_MAX) {
|
|
archive->cd_entry_map = CdEntryMapZip32::Create(static_cast<uint16_t>(num_entries));
|
|
} else {
|
|
archive->cd_entry_map = CdEntryMapZip64::Create();
|
|
}
|
|
if (archive->cd_entry_map == nullptr) {
|
|
return kAllocationFailed;
|
|
}
|
|
|
|
/*
|
|
* Walk through the central directory, adding entries to the hash
|
|
* table and verifying values.
|
|
*/
|
|
const uint8_t* const cd_end = cd_ptr + cd_length;
|
|
const uint8_t* ptr = cd_ptr;
|
|
for (uint64_t i = 0; i < num_entries; i++) {
|
|
if (ptr > cd_end - sizeof(CentralDirectoryRecord)) {
|
|
ALOGW("Zip: ran off the end (item #%" PRIu64 ", %zu bytes of central directory)", i,
|
|
cd_length);
|
|
#if defined(__ANDROID__)
|
|
android_errorWriteLog(0x534e4554, "36392138");
|
|
#endif
|
|
return kInvalidFile;
|
|
}
|
|
|
|
auto cdr = reinterpret_cast<const CentralDirectoryRecord*>(ptr);
|
|
if (cdr->record_signature != CentralDirectoryRecord::kSignature) {
|
|
ALOGW("Zip: missed a central dir sig (at %" PRIu64 ")", i);
|
|
return kInvalidFile;
|
|
}
|
|
|
|
const uint16_t file_name_length = cdr->file_name_length;
|
|
const uint16_t extra_length = cdr->extra_field_length;
|
|
const uint16_t comment_length = cdr->comment_length;
|
|
const uint8_t* file_name = ptr + sizeof(CentralDirectoryRecord);
|
|
|
|
if (file_name_length >= cd_length || file_name > cd_end - file_name_length) {
|
|
ALOGW("Zip: file name for entry %" PRIu64
|
|
" exceeds the central directory range, file_name_length: %" PRIu16 ", cd_length: %zu",
|
|
i, file_name_length, cd_length);
|
|
return kInvalidEntryName;
|
|
}
|
|
|
|
const uint8_t* extra_field = file_name + file_name_length;
|
|
if (extra_length >= cd_length || extra_field > cd_end - extra_length) {
|
|
ALOGW("Zip: extra field for entry %" PRIu64
|
|
" exceeds the central directory range, file_name_length: %" PRIu16 ", cd_length: %zu",
|
|
i, extra_length, cd_length);
|
|
return kInvalidFile;
|
|
}
|
|
|
|
off64_t local_header_offset = cdr->local_file_header_offset;
|
|
if (local_header_offset == UINT32_MAX) {
|
|
Zip64ExtendedInfo zip64_info{};
|
|
if (auto status = ParseZip64ExtendedInfoInExtraField(
|
|
extra_field, extra_length, cdr->uncompressed_size, cdr->compressed_size,
|
|
cdr->local_file_header_offset, &zip64_info);
|
|
status != kSuccess) {
|
|
return status;
|
|
}
|
|
CHECK(zip64_info.local_header_offset.has_value());
|
|
local_header_offset = zip64_info.local_header_offset.value();
|
|
}
|
|
|
|
if (local_header_offset >= archive->directory_offset) {
|
|
ALOGW("Zip: bad LFH offset %" PRId64 " at entry %" PRIu64,
|
|
static_cast<int64_t>(local_header_offset), i);
|
|
return kInvalidFile;
|
|
}
|
|
|
|
// Check that file name is valid UTF-8 and doesn't contain NUL (U+0000) characters.
|
|
if (!IsValidEntryName(file_name, file_name_length)) {
|
|
ALOGW("Zip: invalid file name at entry %" PRIu64, i);
|
|
return kInvalidEntryName;
|
|
}
|
|
|
|
// Add the CDE filename to the hash table.
|
|
std::string_view entry_name{reinterpret_cast<const char*>(file_name), file_name_length};
|
|
if (auto add_result =
|
|
archive->cd_entry_map->AddToMap(entry_name, archive->central_directory.GetBasePtr());
|
|
add_result != 0) {
|
|
ALOGW("Zip: Error adding entry to hash table %d", add_result);
|
|
return add_result;
|
|
}
|
|
|
|
ptr += sizeof(CentralDirectoryRecord) + file_name_length + extra_length + comment_length;
|
|
if ((ptr - cd_ptr) > static_cast<int64_t>(cd_length)) {
|
|
ALOGW("Zip: bad CD advance (%tu vs %zu) at entry %" PRIu64, ptr - cd_ptr, cd_length, i);
|
|
return kInvalidFile;
|
|
}
|
|
}
|
|
|
|
uint32_t lfh_start_bytes;
|
|
if (!archive->mapped_zip.ReadAtOffset(reinterpret_cast<uint8_t*>(&lfh_start_bytes),
|
|
sizeof(uint32_t), 0)) {
|
|
ALOGW("Zip: Unable to read header for entry at offset == 0.");
|
|
return kInvalidFile;
|
|
}
|
|
|
|
if (lfh_start_bytes != LocalFileHeader::kSignature) {
|
|
ALOGW("Zip: Entry at offset zero has invalid LFH signature %" PRIx32, lfh_start_bytes);
|
|
#if defined(__ANDROID__)
|
|
android_errorWriteLog(0x534e4554, "64211847");
|
|
#endif
|
|
return kInvalidFile;
|
|
}
|
|
|
|
ALOGV("+++ zip good scan %" PRIu64 " entries", num_entries);
|
|
|
|
return kSuccess;
|
|
}
|
|
|
|
static int32_t OpenArchiveInternal(ZipArchive* archive, const char* debug_file_name) {
|
|
int32_t result = MapCentralDirectory(debug_file_name, archive);
|
|
return result != kSuccess ? result : ParseZipArchive(archive);
|
|
}
|
|
|
|
int32_t OpenArchiveFd(int fd, const char* debug_file_name, ZipArchiveHandle* handle,
|
|
bool assume_ownership) {
|
|
ZipArchive* archive = new ZipArchive(MappedZipFile(fd), assume_ownership);
|
|
*handle = archive;
|
|
return OpenArchiveInternal(archive, debug_file_name);
|
|
}
|
|
|
|
int32_t OpenArchiveFdRange(int fd, const char* debug_file_name, ZipArchiveHandle* handle,
|
|
off64_t length, off64_t offset, bool assume_ownership) {
|
|
ZipArchive* archive = new ZipArchive(MappedZipFile(fd, length, offset), assume_ownership);
|
|
*handle = archive;
|
|
|
|
if (length < 0) {
|
|
ALOGW("Invalid zip length %" PRId64, length);
|
|
return kIoError;
|
|
}
|
|
|
|
if (offset < 0) {
|
|
ALOGW("Invalid zip offset %" PRId64, offset);
|
|
return kIoError;
|
|
}
|
|
|
|
return OpenArchiveInternal(archive, debug_file_name);
|
|
}
|
|
|
|
int32_t OpenArchive(const char* fileName, ZipArchiveHandle* handle) {
|
|
const int fd = ::android::base::utf8::open(fileName, O_RDONLY | O_BINARY | O_CLOEXEC, 0);
|
|
ZipArchive* archive = new ZipArchive(MappedZipFile(fd), true);
|
|
*handle = archive;
|
|
|
|
if (fd < 0) {
|
|
ALOGW("Unable to open '%s': %s", fileName, strerror(errno));
|
|
return kIoError;
|
|
}
|
|
|
|
return OpenArchiveInternal(archive, fileName);
|
|
}
|
|
|
|
int32_t OpenArchiveFromMemory(const void* address, size_t length, const char* debug_file_name,
|
|
ZipArchiveHandle* handle) {
|
|
ZipArchive* archive = new ZipArchive(address, length);
|
|
*handle = archive;
|
|
return OpenArchiveInternal(archive, debug_file_name);
|
|
}
|
|
|
|
ZipArchiveInfo GetArchiveInfo(ZipArchiveHandle archive) {
|
|
ZipArchiveInfo result;
|
|
result.archive_size = archive->mapped_zip.GetFileLength();
|
|
result.entry_count = archive->num_entries;
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Close a ZipArchive, closing the file and freeing the contents.
|
|
*/
|
|
void CloseArchive(ZipArchiveHandle archive) {
|
|
ALOGV("Closing archive %p", archive);
|
|
delete archive;
|
|
}
|
|
|
|
static int32_t ValidateDataDescriptor(MappedZipFile& mapped_zip, const ZipEntry64* entry) {
|
|
SCOPED_SIGBUS_HANDLER(return kIoError);
|
|
|
|
// Maximum possible size for data descriptor: 2 * 4 + 2 * 8 = 24 bytes
|
|
// The zip format doesn't specify the size of data descriptor. But we won't read OOB here even
|
|
// if the descriptor isn't present. Because the size cd + eocd in the end of the zipfile is
|
|
// larger than 24 bytes. And if the descriptor contains invalid data, we'll abort due to
|
|
// kInconsistentInformation.
|
|
uint8_t ddBuf[24];
|
|
off64_t offset = entry->offset;
|
|
if (entry->method != kCompressStored) {
|
|
offset += entry->compressed_length;
|
|
} else {
|
|
offset += entry->uncompressed_length;
|
|
}
|
|
|
|
if (!mapped_zip.ReadAtOffset(ddBuf, sizeof(ddBuf), offset)) {
|
|
return kIoError;
|
|
}
|
|
|
|
const uint32_t ddSignature = *(reinterpret_cast<const uint32_t*>(ddBuf));
|
|
uint8_t* ddReadPtr = (ddSignature == DataDescriptor::kOptSignature) ? ddBuf + 4 : ddBuf;
|
|
DataDescriptor descriptor{};
|
|
descriptor.crc32 = ConsumeUnaligned<uint32_t>(&ddReadPtr);
|
|
// Don't use entry->zip64_format_size, because that is set to true even if
|
|
// both compressed/uncompressed size are < 0xFFFFFFFF.
|
|
constexpr auto u32max = std::numeric_limits<uint32_t>::max();
|
|
if (entry->compressed_length >= u32max ||
|
|
entry->uncompressed_length >= u32max) {
|
|
descriptor.compressed_size = ConsumeUnaligned<uint64_t>(&ddReadPtr);
|
|
descriptor.uncompressed_size = ConsumeUnaligned<uint64_t>(&ddReadPtr);
|
|
} else {
|
|
descriptor.compressed_size = ConsumeUnaligned<uint32_t>(&ddReadPtr);
|
|
descriptor.uncompressed_size = ConsumeUnaligned<uint32_t>(&ddReadPtr);
|
|
}
|
|
|
|
// Validate that the values in the data descriptor match those in the central
|
|
// directory.
|
|
if (entry->compressed_length != descriptor.compressed_size ||
|
|
entry->uncompressed_length != descriptor.uncompressed_size ||
|
|
entry->crc32 != descriptor.crc32) {
|
|
ALOGW("Zip: size/crc32 mismatch. expected {%" PRIu64 ", %" PRIu64 ", %" PRIx32
|
|
"}, was {%" PRIu64 ", %" PRIu64 ", %" PRIx32 "}",
|
|
entry->compressed_length, entry->uncompressed_length, entry->crc32,
|
|
descriptor.compressed_size, descriptor.uncompressed_size, descriptor.crc32);
|
|
return kInconsistentInformation;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int32_t FindEntry(const ZipArchive* archive, std::string_view entryName,
|
|
const uint64_t nameOffset, ZipEntry64* data) {
|
|
std::vector<uint8_t> name_buf;
|
|
std::vector<uint8_t> local_extra_field;
|
|
SCOPED_SIGBUS_HANDLER({
|
|
incfs::util::clearAndFree(name_buf);
|
|
incfs::util::clearAndFree(local_extra_field);
|
|
return kIoError;
|
|
});
|
|
|
|
// Recover the start of the central directory entry from the filename
|
|
// pointer. The filename is the first entry past the fixed-size data,
|
|
// so we can just subtract back from that.
|
|
const uint8_t* base_ptr = archive->central_directory.GetBasePtr();
|
|
const uint8_t* ptr = base_ptr + nameOffset;
|
|
ptr -= sizeof(CentralDirectoryRecord);
|
|
|
|
// This is the base of our mmapped region, we have to check that
|
|
// the name that's in the hash table is a pointer to a location within
|
|
// this mapped region.
|
|
if (ptr < base_ptr || ptr > base_ptr + archive->central_directory.GetMapLength()) {
|
|
ALOGW("Zip: Invalid entry pointer");
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
auto cdr = reinterpret_cast<const CentralDirectoryRecord*>(ptr);
|
|
|
|
// The offset of the start of the central directory in the zipfile.
|
|
// We keep this lying around so that we can check all our lengths
|
|
// and our per-file structures.
|
|
const off64_t cd_offset = archive->directory_offset;
|
|
|
|
// Fill out the compression method, modification time, crc32
|
|
// and other interesting attributes from the central directory. These
|
|
// will later be compared against values from the local file header.
|
|
data->method = cdr->compression_method;
|
|
data->mod_time = cdr->last_mod_date << 16 | cdr->last_mod_time;
|
|
data->crc32 = cdr->crc32;
|
|
data->compressed_length = cdr->compressed_size;
|
|
data->uncompressed_length = cdr->uncompressed_size;
|
|
|
|
// Figure out the local header offset from the central directory. The
|
|
// actual file data will begin after the local header and the name /
|
|
// extra comments.
|
|
off64_t local_header_offset = cdr->local_file_header_offset;
|
|
// One of the info field is UINT32_MAX, try to parse the real value in the zip64 extended info in
|
|
// the extra field.
|
|
if (cdr->uncompressed_size == UINT32_MAX || cdr->compressed_size == UINT32_MAX ||
|
|
cdr->local_file_header_offset == UINT32_MAX) {
|
|
const uint8_t* extra_field = ptr + sizeof(CentralDirectoryRecord) + cdr->file_name_length;
|
|
Zip64ExtendedInfo zip64_info{};
|
|
if (auto status = ParseZip64ExtendedInfoInExtraField(
|
|
extra_field, cdr->extra_field_length, cdr->uncompressed_size, cdr->compressed_size,
|
|
cdr->local_file_header_offset, &zip64_info);
|
|
status != kSuccess) {
|
|
return status;
|
|
}
|
|
|
|
data->uncompressed_length = zip64_info.uncompressed_file_size.value_or(cdr->uncompressed_size);
|
|
data->compressed_length = zip64_info.compressed_file_size.value_or(cdr->compressed_size);
|
|
local_header_offset = zip64_info.local_header_offset.value_or(local_header_offset);
|
|
data->zip64_format_size =
|
|
cdr->uncompressed_size == UINT32_MAX || cdr->compressed_size == UINT32_MAX;
|
|
}
|
|
|
|
off64_t local_header_end;
|
|
if (__builtin_add_overflow(local_header_offset, sizeof(LocalFileHeader), &local_header_end) ||
|
|
local_header_end >= cd_offset) {
|
|
// We tested >= because the name that follows can't be zero length.
|
|
ALOGW("Zip: bad local hdr offset in zip");
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
uint8_t lfh_buf[sizeof(LocalFileHeader)];
|
|
if (!archive->mapped_zip.ReadAtOffset(lfh_buf, sizeof(lfh_buf), local_header_offset)) {
|
|
ALOGW("Zip: failed reading lfh name from offset %" PRId64,
|
|
static_cast<int64_t>(local_header_offset));
|
|
return kIoError;
|
|
}
|
|
|
|
auto lfh = reinterpret_cast<const LocalFileHeader*>(lfh_buf);
|
|
if (lfh->lfh_signature != LocalFileHeader::kSignature) {
|
|
ALOGW("Zip: didn't find signature at start of lfh, offset=%" PRId64,
|
|
static_cast<int64_t>(local_header_offset));
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
// Check that the local file header name matches the declared name in the central directory.
|
|
CHECK_LE(entryName.size(), UINT16_MAX);
|
|
auto name_length = static_cast<uint16_t>(entryName.size());
|
|
if (lfh->file_name_length != name_length) {
|
|
ALOGW("Zip: lfh name length did not match central directory for %s: %" PRIu16 " %" PRIu16,
|
|
std::string(entryName).c_str(), lfh->file_name_length, name_length);
|
|
return kInconsistentInformation;
|
|
}
|
|
off64_t name_offset;
|
|
if (__builtin_add_overflow(local_header_offset, sizeof(LocalFileHeader), &name_offset)) {
|
|
ALOGW("Zip: lfh name offset invalid");
|
|
return kInvalidOffset;
|
|
}
|
|
off64_t name_end;
|
|
if (__builtin_add_overflow(name_offset, name_length, &name_end) || name_end > cd_offset) {
|
|
// We tested > cd_offset here because the file data that follows can be zero length.
|
|
ALOGW("Zip: lfh name length invalid");
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
name_buf.resize(name_length);
|
|
if (!archive->mapped_zip.ReadAtOffset(name_buf.data(), name_buf.size(), name_offset)) {
|
|
ALOGW("Zip: failed reading lfh name from offset %" PRId64, static_cast<int64_t>(name_offset));
|
|
return kIoError;
|
|
}
|
|
if (memcmp(entryName.data(), name_buf.data(), name_buf.size()) != 0) {
|
|
ALOGW("Zip: lfh name did not match central directory");
|
|
return kInconsistentInformation;
|
|
}
|
|
|
|
uint64_t lfh_uncompressed_size = lfh->uncompressed_size;
|
|
uint64_t lfh_compressed_size = lfh->compressed_size;
|
|
if (lfh_uncompressed_size == UINT32_MAX || lfh_compressed_size == UINT32_MAX) {
|
|
if (lfh_uncompressed_size != UINT32_MAX || lfh_compressed_size != UINT32_MAX) {
|
|
ALOGW(
|
|
"Zip: The zip64 extended field in the local header MUST include BOTH original and "
|
|
"compressed file size fields.");
|
|
return kInvalidFile;
|
|
}
|
|
|
|
const off64_t lfh_extra_field_offset = name_offset + lfh->file_name_length;
|
|
const uint16_t lfh_extra_field_size = lfh->extra_field_length;
|
|
if (lfh_extra_field_offset > cd_offset - lfh_extra_field_size) {
|
|
ALOGW("Zip: extra field has a bad size for entry %s", std::string(entryName).c_str());
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
local_extra_field.resize(lfh_extra_field_size);
|
|
if (!archive->mapped_zip.ReadAtOffset(local_extra_field.data(), lfh_extra_field_size,
|
|
lfh_extra_field_offset)) {
|
|
ALOGW("Zip: failed reading lfh extra field from offset %" PRId64, lfh_extra_field_offset);
|
|
return kIoError;
|
|
}
|
|
|
|
Zip64ExtendedInfo zip64_info{};
|
|
if (auto status = ParseZip64ExtendedInfoInExtraField(
|
|
local_extra_field.data(), lfh_extra_field_size, lfh->uncompressed_size,
|
|
lfh->compressed_size, std::nullopt, &zip64_info);
|
|
status != kSuccess) {
|
|
return status;
|
|
}
|
|
|
|
CHECK(zip64_info.uncompressed_file_size.has_value());
|
|
CHECK(zip64_info.compressed_file_size.has_value());
|
|
lfh_uncompressed_size = zip64_info.uncompressed_file_size.value();
|
|
lfh_compressed_size = zip64_info.compressed_file_size.value();
|
|
}
|
|
|
|
// Paranoia: Match the values specified in the local file header
|
|
// to those specified in the central directory.
|
|
|
|
// Warn if central directory and local file header don't agree on the use
|
|
// of a trailing Data Descriptor. The reference implementation is inconsistent
|
|
// and appears to use the LFH value during extraction (unzip) but the CD value
|
|
// while displayng information about archives (zipinfo). The spec remains
|
|
// silent on this inconsistency as well.
|
|
//
|
|
// For now, always use the version from the LFH but make sure that the values
|
|
// specified in the central directory match those in the data descriptor.
|
|
//
|
|
// NOTE: It's also worth noting that unzip *does* warn about inconsistencies in
|
|
// bit 11 (EFS: The language encoding flag, marking that filename and comment are
|
|
// encoded using UTF-8). This implementation does not check for the presence of
|
|
// that flag and always enforces that entry names are valid UTF-8.
|
|
if ((lfh->gpb_flags & kGPBDDFlagMask) != (cdr->gpb_flags & kGPBDDFlagMask)) {
|
|
ALOGW("Zip: gpb flag mismatch at bit 3. expected {%04" PRIx16 "}, was {%04" PRIx16 "}",
|
|
cdr->gpb_flags, lfh->gpb_flags);
|
|
}
|
|
|
|
// If there is no trailing data descriptor, verify that the central directory and local file
|
|
// header agree on the crc, compressed, and uncompressed sizes of the entry.
|
|
if ((lfh->gpb_flags & kGPBDDFlagMask) == 0) {
|
|
data->has_data_descriptor = 0;
|
|
if (data->compressed_length != lfh_compressed_size ||
|
|
data->uncompressed_length != lfh_uncompressed_size || data->crc32 != lfh->crc32) {
|
|
ALOGW("Zip: size/crc32 mismatch. expected {%" PRIu64 ", %" PRIu64 ", %" PRIx32
|
|
"}, was {%" PRIu64 ", %" PRIu64 ", %" PRIx32 "}",
|
|
data->compressed_length, data->uncompressed_length, data->crc32, lfh_compressed_size,
|
|
lfh_uncompressed_size, lfh->crc32);
|
|
return kInconsistentInformation;
|
|
}
|
|
} else {
|
|
data->has_data_descriptor = 1;
|
|
}
|
|
|
|
// 4.4.2.1: the upper byte of `version_made_by` gives the source OS. Unix is 3.
|
|
data->version_made_by = cdr->version_made_by;
|
|
data->external_file_attributes = cdr->external_file_attributes;
|
|
if ((data->version_made_by >> 8) == 3) {
|
|
data->unix_mode = (cdr->external_file_attributes >> 16) & 0xffff;
|
|
} else {
|
|
data->unix_mode = 0777;
|
|
}
|
|
|
|
// 4.4.4: general purpose bit flags.
|
|
data->gpbf = lfh->gpb_flags;
|
|
|
|
// 4.4.14: the lowest bit of the internal file attributes field indicates text.
|
|
// Currently only needed to implement zipinfo.
|
|
data->is_text = (cdr->internal_file_attributes & 1);
|
|
|
|
const off64_t data_offset = local_header_offset + sizeof(LocalFileHeader) +
|
|
lfh->file_name_length + lfh->extra_field_length;
|
|
if (data_offset > cd_offset) {
|
|
ALOGW("Zip: bad data offset %" PRId64 " in zip", static_cast<int64_t>(data_offset));
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
if (data->compressed_length > cd_offset - data_offset) {
|
|
ALOGW("Zip: bad compressed length in zip (%" PRId64 " + %" PRIu64 " > %" PRId64 ")",
|
|
static_cast<int64_t>(data_offset), data->compressed_length,
|
|
static_cast<int64_t>(cd_offset));
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
if (data->method == kCompressStored && data->uncompressed_length > cd_offset - data_offset) {
|
|
ALOGW("Zip: bad uncompressed length in zip (%" PRId64 " + %" PRIu64 " > %" PRId64 ")",
|
|
static_cast<int64_t>(data_offset), data->uncompressed_length,
|
|
static_cast<int64_t>(cd_offset));
|
|
return kInvalidOffset;
|
|
}
|
|
|
|
data->offset = data_offset;
|
|
return 0;
|
|
}
|
|
|
|
struct IterationHandle {
|
|
ZipArchive* archive;
|
|
|
|
std::function<bool(std::string_view)> matcher;
|
|
|
|
uint32_t position = 0;
|
|
|
|
IterationHandle(ZipArchive* archive, std::function<bool(std::string_view)> in_matcher)
|
|
: archive(archive), matcher(std::move(in_matcher)) {}
|
|
|
|
bool Match(std::string_view entry_name) const { return matcher(entry_name); }
|
|
};
|
|
|
|
int32_t StartIteration(ZipArchiveHandle archive, void** cookie_ptr,
|
|
const std::string_view optional_prefix,
|
|
const std::string_view optional_suffix) {
|
|
if (optional_prefix.size() > static_cast<size_t>(UINT16_MAX) ||
|
|
optional_suffix.size() > static_cast<size_t>(UINT16_MAX)) {
|
|
ALOGW("Zip: prefix/suffix too long");
|
|
return kInvalidEntryName;
|
|
}
|
|
auto matcher = [prefix = std::string(optional_prefix),
|
|
suffix = std::string(optional_suffix)](std::string_view name) mutable {
|
|
return android::base::StartsWith(name, prefix) && android::base::EndsWith(name, suffix);
|
|
};
|
|
return StartIteration(archive, cookie_ptr, std::move(matcher));
|
|
}
|
|
|
|
int32_t StartIteration(ZipArchiveHandle archive, void** cookie_ptr,
|
|
std::function<bool(std::string_view)> matcher) {
|
|
if (archive == nullptr || archive->cd_entry_map == nullptr) {
|
|
ALOGW("Zip: Invalid ZipArchiveHandle");
|
|
return kInvalidHandle;
|
|
}
|
|
|
|
archive->cd_entry_map->ResetIteration();
|
|
*cookie_ptr = new IterationHandle(archive, std::move(matcher));
|
|
return 0;
|
|
}
|
|
|
|
void EndIteration(void* cookie) {
|
|
delete reinterpret_cast<IterationHandle*>(cookie);
|
|
}
|
|
|
|
int32_t ZipEntry::CopyFromZipEntry64(ZipEntry* dst, const ZipEntry64* src) {
|
|
if (src->compressed_length > UINT32_MAX || src->uncompressed_length > UINT32_MAX) {
|
|
ALOGW(
|
|
"Zip: the entry size is too large to fit into the 32 bits ZipEntry, uncompressed "
|
|
"length %" PRIu64 ", compressed length %" PRIu64,
|
|
src->uncompressed_length, src->compressed_length);
|
|
return kUnsupportedEntrySize;
|
|
}
|
|
|
|
*dst = *src;
|
|
dst->uncompressed_length = static_cast<uint32_t>(src->uncompressed_length);
|
|
dst->compressed_length = static_cast<uint32_t>(src->compressed_length);
|
|
return kSuccess;
|
|
}
|
|
|
|
int32_t FindEntry(const ZipArchiveHandle archive, const std::string_view entryName,
|
|
ZipEntry* data) {
|
|
ZipEntry64 entry64;
|
|
if (auto status = FindEntry(archive, entryName, &entry64); status != kSuccess) {
|
|
return status;
|
|
}
|
|
|
|
return ZipEntry::CopyFromZipEntry64(data, &entry64);
|
|
}
|
|
|
|
int32_t FindEntry(const ZipArchiveHandle archive, const std::string_view entryName,
|
|
ZipEntry64* data) {
|
|
if (entryName.empty() || entryName.size() > static_cast<size_t>(UINT16_MAX)) {
|
|
ALOGW("Zip: Invalid filename of length %zu", entryName.size());
|
|
return kInvalidEntryName;
|
|
}
|
|
|
|
const auto [result, offset] =
|
|
archive->cd_entry_map->GetCdEntryOffset(entryName, archive->central_directory.GetBasePtr());
|
|
if (result != 0) {
|
|
ALOGV("Zip: Could not find entry %.*s", static_cast<int>(entryName.size()), entryName.data());
|
|
return static_cast<int32_t>(result); // kEntryNotFound is safe to truncate.
|
|
}
|
|
// We know there are at most hash_table_size entries, safe to truncate.
|
|
return FindEntry(archive, entryName, offset, data);
|
|
}
|
|
|
|
int32_t Next(void* cookie, ZipEntry* data, std::string* name) {
|
|
ZipEntry64 entry64;
|
|
if (auto status = Next(cookie, &entry64, name); status != kSuccess) {
|
|
return status;
|
|
}
|
|
|
|
return ZipEntry::CopyFromZipEntry64(data, &entry64);
|
|
}
|
|
|
|
int32_t Next(void* cookie, ZipEntry* data, std::string_view* name) {
|
|
ZipEntry64 entry64;
|
|
if (auto status = Next(cookie, &entry64, name); status != kSuccess) {
|
|
return status;
|
|
}
|
|
|
|
return ZipEntry::CopyFromZipEntry64(data, &entry64);
|
|
}
|
|
|
|
int32_t Next(void* cookie, ZipEntry64* data, std::string* name) {
|
|
std::string_view sv;
|
|
int32_t result = Next(cookie, data, &sv);
|
|
if (result == 0 && name) {
|
|
*name = std::string(sv);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
int32_t Next(void* cookie, ZipEntry64* data, std::string_view* name) {
|
|
IterationHandle* handle = reinterpret_cast<IterationHandle*>(cookie);
|
|
if (handle == nullptr) {
|
|
ALOGW("Zip: Null ZipArchiveHandle");
|
|
return kInvalidHandle;
|
|
}
|
|
|
|
ZipArchive* archive = handle->archive;
|
|
if (archive == nullptr || archive->cd_entry_map == nullptr) {
|
|
ALOGW("Zip: Invalid ZipArchiveHandle");
|
|
return kInvalidHandle;
|
|
}
|
|
|
|
SCOPED_SIGBUS_HANDLER(return kIoError);
|
|
|
|
auto entry = archive->cd_entry_map->Next(archive->central_directory.GetBasePtr());
|
|
while (entry != std::pair<std::string_view, uint64_t>()) {
|
|
const auto [entry_name, offset] = entry;
|
|
if (handle->Match(entry_name)) {
|
|
const int error = FindEntry(archive, entry_name, offset, data);
|
|
if (!error && name) {
|
|
*name = entry_name;
|
|
}
|
|
return error;
|
|
}
|
|
entry = archive->cd_entry_map->Next(archive->central_directory.GetBasePtr());
|
|
}
|
|
|
|
archive->cd_entry_map->ResetIteration();
|
|
return kIterationEnd;
|
|
}
|
|
|
|
// A Writer that writes data to a fixed size memory region.
|
|
// The size of the memory region must be equal to the total size of
|
|
// the data appended to it.
|
|
class MemoryWriter : public zip_archive::Writer {
|
|
public:
|
|
static std::optional<MemoryWriter> Create(uint8_t* buf, size_t size,
|
|
const ZipEntry64* entry) {
|
|
const uint64_t declared_length = entry->uncompressed_length;
|
|
if (declared_length > size) {
|
|
ALOGW("Zip: file size %" PRIu64 " is larger than the buffer size %zu.", declared_length,
|
|
size);
|
|
return {};
|
|
}
|
|
|
|
return std::make_optional<MemoryWriter>(buf, size);
|
|
}
|
|
|
|
virtual bool Append(uint8_t* buf, size_t buf_size) override {
|
|
if (size_ < buf_size || bytes_written_ > size_ - buf_size) {
|
|
ALOGW("Zip: Unexpected size %zu (declared) vs %zu (actual)", size_,
|
|
bytes_written_ + buf_size);
|
|
return false;
|
|
}
|
|
|
|
memcpy(buf_ + bytes_written_, buf, buf_size);
|
|
bytes_written_ += buf_size;
|
|
return true;
|
|
}
|
|
|
|
MemoryWriter(uint8_t* buf, size_t size) : Writer(), buf_(buf), size_(size), bytes_written_(0) {}
|
|
|
|
private:
|
|
uint8_t* const buf_{nullptr};
|
|
const size_t size_;
|
|
size_t bytes_written_;
|
|
};
|
|
|
|
// A Writer that appends data to a file |fd| at its current position.
|
|
// The file will be truncated to the end of the written data.
|
|
class FileWriter : public zip_archive::Writer {
|
|
public:
|
|
// Creates a FileWriter for |fd| and prepare to write |entry| to it,
|
|
// guaranteeing that the file descriptor is valid and that there's enough
|
|
// space on the volume to write out the entry completely and that the file
|
|
// is truncated to the correct length (no truncation if |fd| references a
|
|
// block device).
|
|
//
|
|
// Returns a valid FileWriter on success, |nullopt| if an error occurred.
|
|
static std::optional<FileWriter> Create(int fd, const ZipEntry64* entry) {
|
|
const uint64_t declared_length = entry->uncompressed_length;
|
|
const off64_t current_offset = lseek64(fd, 0, SEEK_CUR);
|
|
if (current_offset == -1) {
|
|
ALOGW("Zip: unable to seek to current location on fd %d: %s", fd, strerror(errno));
|
|
return {};
|
|
}
|
|
|
|
if (declared_length > SIZE_MAX || declared_length > INT64_MAX) {
|
|
ALOGW("Zip: file size %" PRIu64 " is too large to extract.", declared_length);
|
|
return {};
|
|
}
|
|
|
|
#if defined(__linux__)
|
|
if (declared_length > 0) {
|
|
// Make sure we have enough space on the volume to extract the compressed
|
|
// entry. Note that the call to ftruncate below will change the file size but
|
|
// will not allocate space on disk and this call to fallocate will not
|
|
// change the file size.
|
|
// Note: fallocate is only supported by the following filesystems -
|
|
// btrfs, ext4, ocfs2, and xfs. Therefore fallocate might fail with
|
|
// EOPNOTSUPP error when issued in other filesystems.
|
|
// Hence, check for the return error code before concluding that the
|
|
// disk does not have enough space.
|
|
long result = TEMP_FAILURE_RETRY(fallocate(fd, 0, current_offset, declared_length));
|
|
if (result == -1 && errno == ENOSPC) {
|
|
ALOGW("Zip: unable to allocate %" PRIu64 " bytes at offset %" PRId64 ": %s",
|
|
declared_length, static_cast<int64_t>(current_offset), strerror(errno));
|
|
return {};
|
|
}
|
|
}
|
|
#endif // __linux__
|
|
|
|
struct stat sb;
|
|
if (fstat(fd, &sb) == -1) {
|
|
ALOGW("Zip: unable to fstat file: %s", strerror(errno));
|
|
return {};
|
|
}
|
|
|
|
// Block device doesn't support ftruncate(2).
|
|
if (!S_ISBLK(sb.st_mode)) {
|
|
long result = TEMP_FAILURE_RETRY(ftruncate(fd, declared_length + current_offset));
|
|
if (result == -1) {
|
|
ALOGW("Zip: unable to truncate file to %" PRId64 ": %s",
|
|
static_cast<int64_t>(declared_length + current_offset), strerror(errno));
|
|
return {};
|
|
}
|
|
}
|
|
|
|
return std::make_optional<FileWriter>(fd, declared_length);
|
|
}
|
|
|
|
virtual bool Append(uint8_t* buf, size_t buf_size) override {
|
|
if (declared_length_ < buf_size || total_bytes_written_ > declared_length_ - buf_size) {
|
|
ALOGW("Zip: Unexpected size %zu (declared) vs %zu (actual)", declared_length_,
|
|
total_bytes_written_ + buf_size);
|
|
return false;
|
|
}
|
|
|
|
const bool result = android::base::WriteFully(fd_, buf, buf_size);
|
|
if (result) {
|
|
total_bytes_written_ += buf_size;
|
|
} else {
|
|
ALOGW("Zip: unable to write %zu bytes to file; %s", buf_size, strerror(errno));
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
explicit FileWriter(const int fd = -1, const uint64_t declared_length = 0)
|
|
: Writer(),
|
|
fd_(fd),
|
|
declared_length_(static_cast<size_t>(declared_length)),
|
|
total_bytes_written_(0) {
|
|
CHECK_LE(declared_length, SIZE_MAX);
|
|
}
|
|
|
|
private:
|
|
int fd_;
|
|
const size_t declared_length_;
|
|
size_t total_bytes_written_;
|
|
};
|
|
|
|
class EntryReader : public zip_archive::Reader {
|
|
public:
|
|
EntryReader(const MappedZipFile& zip_file, const ZipEntry64* entry)
|
|
: Reader(), zip_file_(zip_file), entry_(entry) {}
|
|
|
|
virtual bool ReadAtOffset(uint8_t* buf, size_t len, off64_t offset) const {
|
|
return zip_file_.ReadAtOffset(buf, len, entry_->offset + offset);
|
|
}
|
|
|
|
virtual ~EntryReader() {}
|
|
|
|
private:
|
|
const MappedZipFile& zip_file_;
|
|
const ZipEntry64* entry_;
|
|
};
|
|
|
|
// This method is using libz macros with old-style-casts
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wold-style-cast"
|
|
static inline int zlib_inflateInit2(z_stream* stream, int window_bits) {
|
|
return inflateInit2(stream, window_bits);
|
|
}
|
|
#pragma GCC diagnostic pop
|
|
|
|
namespace zip_archive {
|
|
|
|
// Moved out of line to avoid -Wweak-vtables.
|
|
Reader::~Reader() {}
|
|
Writer::~Writer() {}
|
|
|
|
} // namespace zip_archive
|
|
|
|
template <bool OnIncfs>
|
|
static int32_t inflateImpl(const zip_archive::Reader& reader,
|
|
const uint64_t compressed_length,
|
|
const uint64_t uncompressed_length,
|
|
zip_archive::Writer* writer, uint64_t* crc_out) {
|
|
const size_t kBufSize = 32768;
|
|
std::vector<uint8_t> read_buf(kBufSize);
|
|
std::vector<uint8_t> write_buf(kBufSize);
|
|
z_stream zstream;
|
|
int zerr;
|
|
|
|
/*
|
|
* Initialize the zlib stream struct.
|
|
*/
|
|
memset(&zstream, 0, sizeof(zstream));
|
|
zstream.zalloc = Z_NULL;
|
|
zstream.zfree = Z_NULL;
|
|
zstream.opaque = Z_NULL;
|
|
zstream.next_in = NULL;
|
|
zstream.avail_in = 0;
|
|
zstream.next_out = &write_buf[0];
|
|
zstream.avail_out = kBufSize;
|
|
zstream.data_type = Z_UNKNOWN;
|
|
|
|
/*
|
|
* Use the undocumented "negative window bits" feature to tell zlib
|
|
* that there's no zlib header waiting for it.
|
|
*/
|
|
zerr = zlib_inflateInit2(&zstream, -MAX_WBITS);
|
|
if (zerr != Z_OK) {
|
|
if (zerr == Z_VERSION_ERROR) {
|
|
ALOGE("Installed zlib is not compatible with linked version (%s)", ZLIB_VERSION);
|
|
} else {
|
|
ALOGW("Call to inflateInit2 failed (zerr=%d)", zerr);
|
|
}
|
|
|
|
return kZlibError;
|
|
}
|
|
|
|
auto zstream_deleter = [](z_stream* stream) {
|
|
inflateEnd(stream); /* free up any allocated structures */
|
|
};
|
|
|
|
std::unique_ptr<z_stream, decltype(zstream_deleter)> zstream_guard(&zstream, zstream_deleter);
|
|
|
|
SCOPED_SIGBUS_HANDLER_CONDITIONAL(OnIncfs, {
|
|
zstream_guard.reset();
|
|
incfs::util::clearAndFree(read_buf);
|
|
incfs::util::clearAndFree(write_buf);
|
|
return kIoError;
|
|
});
|
|
|
|
const bool compute_crc = (crc_out != nullptr);
|
|
uLong crc = 0;
|
|
uint64_t remaining_bytes = compressed_length;
|
|
uint64_t total_output = 0;
|
|
do {
|
|
/* read as much as we can */
|
|
if (zstream.avail_in == 0) {
|
|
const uint32_t read_size =
|
|
(remaining_bytes > kBufSize) ? kBufSize : static_cast<uint32_t>(remaining_bytes);
|
|
const off64_t offset = (compressed_length - remaining_bytes);
|
|
// Make sure to read at offset to ensure concurrent access to the fd.
|
|
if (!reader.ReadAtOffset(read_buf.data(), read_size, offset)) {
|
|
ALOGW("Zip: inflate read failed, getSize = %u: %s", read_size, strerror(errno));
|
|
return kIoError;
|
|
}
|
|
|
|
remaining_bytes -= read_size;
|
|
|
|
zstream.next_in = &read_buf[0];
|
|
zstream.avail_in = read_size;
|
|
}
|
|
|
|
/* uncompress the data */
|
|
zerr = inflate(&zstream, Z_NO_FLUSH);
|
|
if (zerr != Z_OK && zerr != Z_STREAM_END) {
|
|
ALOGW("Zip: inflate zerr=%d (nIn=%p aIn=%u nOut=%p aOut=%u)", zerr, zstream.next_in,
|
|
zstream.avail_in, zstream.next_out, zstream.avail_out);
|
|
return kZlibError;
|
|
}
|
|
|
|
/* write when we're full or when we're done */
|
|
if (zstream.avail_out == 0 || (zerr == Z_STREAM_END && zstream.avail_out != kBufSize)) {
|
|
const size_t write_size = zstream.next_out - &write_buf[0];
|
|
if (!writer->Append(&write_buf[0], write_size)) {
|
|
return kIoError;
|
|
} else if (compute_crc) {
|
|
DCHECK_LE(write_size, kBufSize);
|
|
crc = crc32(crc, &write_buf[0], static_cast<uint32_t>(write_size));
|
|
}
|
|
|
|
total_output += kBufSize - zstream.avail_out;
|
|
zstream.next_out = &write_buf[0];
|
|
zstream.avail_out = kBufSize;
|
|
}
|
|
} while (zerr == Z_OK);
|
|
|
|
CHECK_EQ(zerr, Z_STREAM_END); /* other errors should've been caught */
|
|
|
|
// NOTE: zstream.adler is always set to 0, because we're using the -MAX_WBITS
|
|
// "feature" of zlib to tell it there won't be a zlib file header. zlib
|
|
// doesn't bother calculating the checksum in that scenario. We just do
|
|
// it ourselves above because there are no additional gains to be made by
|
|
// having zlib calculate it for us, since they do it by calling crc32 in
|
|
// the same manner that we have above.
|
|
if (compute_crc) {
|
|
*crc_out = crc;
|
|
}
|
|
if (total_output != uncompressed_length || remaining_bytes != 0) {
|
|
ALOGW("Zip: size mismatch on inflated file (%lu vs %" PRIu64 ")", zstream.total_out,
|
|
uncompressed_length);
|
|
return kInconsistentInformation;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int32_t InflateEntryToWriter(MappedZipFile& mapped_zip, const ZipEntry64* entry,
|
|
zip_archive::Writer* writer, uint64_t* crc_out) {
|
|
const EntryReader reader(mapped_zip, entry);
|
|
|
|
return inflateImpl<true>(reader, entry->compressed_length,
|
|
entry->uncompressed_length, writer, crc_out);
|
|
}
|
|
|
|
static int32_t CopyEntryToWriter(MappedZipFile& mapped_zip, const ZipEntry64* entry,
|
|
zip_archive::Writer* writer, uint64_t* crc_out) {
|
|
static const uint32_t kBufSize = 32768;
|
|
std::vector<uint8_t> buf(kBufSize);
|
|
|
|
SCOPED_SIGBUS_HANDLER({
|
|
incfs::util::clearAndFree(buf);
|
|
return kIoError;
|
|
});
|
|
|
|
const uint64_t length = entry->uncompressed_length;
|
|
uint64_t count = 0;
|
|
uLong crc = 0;
|
|
while (count < length) {
|
|
uint64_t remaining = length - count;
|
|
off64_t offset = entry->offset + count;
|
|
|
|
// Safe conversion because kBufSize is narrow enough for a 32 bit signed value.
|
|
const uint32_t block_size =
|
|
(remaining > kBufSize) ? kBufSize : static_cast<uint32_t>(remaining);
|
|
|
|
// Make sure to read at offset to ensure concurrent access to the fd.
|
|
if (!mapped_zip.ReadAtOffset(buf.data(), block_size, offset)) {
|
|
ALOGW("CopyFileToFile: copy read failed, block_size = %u, offset = %" PRId64 ": %s",
|
|
block_size, static_cast<int64_t>(offset), strerror(errno));
|
|
return kIoError;
|
|
}
|
|
|
|
if (!writer->Append(&buf[0], block_size)) {
|
|
return kIoError;
|
|
}
|
|
if (crc_out) {
|
|
crc = crc32(crc, &buf[0], block_size);
|
|
}
|
|
count += block_size;
|
|
}
|
|
|
|
if (crc_out) {
|
|
*crc_out = crc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int32_t extractToWriter(ZipArchiveHandle handle, const ZipEntry64* entry,
|
|
zip_archive::Writer* writer) {
|
|
const uint16_t method = entry->method;
|
|
|
|
// this should default to kUnknownCompressionMethod.
|
|
int32_t return_value = -1;
|
|
uint64_t crc = 0;
|
|
if (method == kCompressStored) {
|
|
return_value =
|
|
CopyEntryToWriter(handle->mapped_zip, entry, writer, kCrcChecksEnabled ? &crc : nullptr);
|
|
} else if (method == kCompressDeflated) {
|
|
return_value =
|
|
InflateEntryToWriter(handle->mapped_zip, entry, writer, kCrcChecksEnabled ? &crc : nullptr);
|
|
}
|
|
|
|
if (!return_value && entry->has_data_descriptor) {
|
|
return_value = ValidateDataDescriptor(handle->mapped_zip, entry);
|
|
if (return_value) {
|
|
return return_value;
|
|
}
|
|
}
|
|
|
|
// Validate that the CRC matches the calculated value.
|
|
if (kCrcChecksEnabled && (entry->crc32 != static_cast<uint32_t>(crc))) {
|
|
ALOGW("Zip: crc mismatch: expected %" PRIu32 ", was %" PRIu64, entry->crc32, crc);
|
|
return kInconsistentInformation;
|
|
}
|
|
|
|
return return_value;
|
|
}
|
|
|
|
int32_t ExtractToMemory(ZipArchiveHandle archive, const ZipEntry* entry, uint8_t* begin,
|
|
size_t size) {
|
|
ZipEntry64 entry64(*entry);
|
|
return ExtractToMemory(archive, &entry64, begin, size);
|
|
}
|
|
|
|
int32_t ExtractToMemory(ZipArchiveHandle archive, const ZipEntry64* entry, uint8_t* begin,
|
|
size_t size) {
|
|
auto writer = MemoryWriter::Create(begin, size, entry);
|
|
if (!writer) {
|
|
return kIoError;
|
|
}
|
|
|
|
return extractToWriter(archive, entry, &writer.value());
|
|
}
|
|
|
|
int32_t ExtractEntryToFile(ZipArchiveHandle archive, const ZipEntry* entry, int fd) {
|
|
ZipEntry64 entry64(*entry);
|
|
return ExtractEntryToFile(archive, &entry64, fd);
|
|
}
|
|
|
|
int32_t ExtractEntryToFile(ZipArchiveHandle archive, const ZipEntry64* entry, int fd) {
|
|
auto writer = FileWriter::Create(fd, entry);
|
|
if (!writer) {
|
|
return kIoError;
|
|
}
|
|
|
|
return extractToWriter(archive, entry, &writer.value());
|
|
}
|
|
|
|
int GetFileDescriptor(const ZipArchiveHandle archive) {
|
|
return archive->mapped_zip.GetFileDescriptor();
|
|
}
|
|
|
|
off64_t GetFileDescriptorOffset(const ZipArchiveHandle archive) {
|
|
return archive->mapped_zip.GetFileOffset();
|
|
}
|
|
|
|
//
|
|
// ZIPARCHIVE_DISABLE_CALLBACK_API disables all APIs that accept user callbacks.
|
|
// It gets defined for the incfs-supporting version of libziparchive, where one
|
|
// has to control all the code accessing the archive. See more at
|
|
// incfs_support/signal_handling.h
|
|
//
|
|
#if !ZIPARCHIVE_DISABLE_CALLBACK_API && !defined(_WIN32)
|
|
class ProcessWriter : public zip_archive::Writer {
|
|
public:
|
|
ProcessWriter(ProcessZipEntryFunction func, void* cookie)
|
|
: Writer(), proc_function_(func), cookie_(cookie) {}
|
|
|
|
virtual bool Append(uint8_t* buf, size_t buf_size) override {
|
|
return proc_function_(buf, buf_size, cookie_);
|
|
}
|
|
|
|
private:
|
|
ProcessZipEntryFunction proc_function_;
|
|
void* cookie_;
|
|
};
|
|
|
|
int32_t ProcessZipEntryContents(ZipArchiveHandle archive, const ZipEntry* entry,
|
|
ProcessZipEntryFunction func, void* cookie) {
|
|
ZipEntry64 entry64(*entry);
|
|
return ProcessZipEntryContents(archive, &entry64, func, cookie);
|
|
}
|
|
|
|
int32_t ProcessZipEntryContents(ZipArchiveHandle archive, const ZipEntry64* entry,
|
|
ProcessZipEntryFunction func, void* cookie) {
|
|
ProcessWriter writer(func, cookie);
|
|
return extractToWriter(archive, entry, &writer);
|
|
}
|
|
|
|
#endif // !ZIPARCHIVE_DISABLE_CALLBACK_API && !defined(_WIN32)
|
|
|
|
int MappedZipFile::GetFileDescriptor() const {
|
|
if (!has_fd_) {
|
|
ALOGW("Zip: MappedZipFile doesn't have a file descriptor.");
|
|
return -1;
|
|
}
|
|
return fd_;
|
|
}
|
|
|
|
const void* MappedZipFile::GetBasePtr() const {
|
|
if (has_fd_) {
|
|
ALOGW("Zip: MappedZipFile doesn't have a base pointer.");
|
|
return nullptr;
|
|
}
|
|
return base_ptr_;
|
|
}
|
|
|
|
off64_t MappedZipFile::GetFileOffset() const {
|
|
return fd_offset_;
|
|
}
|
|
|
|
off64_t MappedZipFile::GetFileLength() const {
|
|
if (has_fd_) {
|
|
if (data_length_ != -1) {
|
|
return data_length_;
|
|
}
|
|
data_length_ = lseek64(fd_, 0, SEEK_END);
|
|
if (data_length_ == -1) {
|
|
ALOGE("Zip: lseek on fd %d failed: %s", fd_, strerror(errno));
|
|
}
|
|
return data_length_;
|
|
} else {
|
|
if (base_ptr_ == nullptr) {
|
|
ALOGE("Zip: invalid file map");
|
|
return -1;
|
|
}
|
|
return data_length_;
|
|
}
|
|
}
|
|
|
|
// Attempts to read |len| bytes into |buf| at offset |off|.
|
|
bool MappedZipFile::ReadAtOffset(uint8_t* buf, size_t len, off64_t off) const {
|
|
if (has_fd_) {
|
|
if (off < 0) {
|
|
ALOGE("Zip: invalid offset %" PRId64, off);
|
|
return false;
|
|
}
|
|
|
|
off64_t read_offset;
|
|
if (__builtin_add_overflow(fd_offset_, off, &read_offset)) {
|
|
ALOGE("Zip: invalid read offset %" PRId64 " overflows, fd offset %" PRId64, off, fd_offset_);
|
|
return false;
|
|
}
|
|
|
|
if (data_length_ != -1) {
|
|
off64_t read_end;
|
|
if (len > std::numeric_limits<off64_t>::max() ||
|
|
__builtin_add_overflow(off, static_cast<off64_t>(len), &read_end)) {
|
|
ALOGE("Zip: invalid read length %" PRId64 " overflows, offset %" PRId64,
|
|
static_cast<off64_t>(len), off);
|
|
return false;
|
|
}
|
|
|
|
if (read_end > data_length_) {
|
|
ALOGE("Zip: invalid read length %" PRId64 " exceeds data length %" PRId64 ", offset %"
|
|
PRId64, static_cast<off64_t>(len), data_length_, off);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!android::base::ReadFullyAtOffset(fd_, buf, len, read_offset)) {
|
|
ALOGE("Zip: failed to read at offset %" PRId64, off);
|
|
return false;
|
|
}
|
|
} else {
|
|
if (off < 0 || data_length_ < len || off > data_length_ - len) {
|
|
ALOGE("Zip: invalid offset: %" PRId64 ", read length: %zu, data length: %" PRId64, off, len,
|
|
data_length_);
|
|
return false;
|
|
}
|
|
memcpy(buf, static_cast<const uint8_t*>(base_ptr_) + off, len);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void CentralDirectory::Initialize(const void* map_base_ptr, off64_t cd_start_offset,
|
|
size_t cd_size) {
|
|
base_ptr_ = static_cast<const uint8_t*>(map_base_ptr) + cd_start_offset;
|
|
length_ = cd_size;
|
|
}
|
|
|
|
bool ZipArchive::InitializeCentralDirectory(off64_t cd_start_offset, size_t cd_size) {
|
|
if (mapped_zip.HasFd()) {
|
|
directory_map = android::base::MappedFile::FromFd(mapped_zip.GetFileDescriptor(),
|
|
mapped_zip.GetFileOffset() + cd_start_offset,
|
|
cd_size, PROT_READ);
|
|
if (!directory_map) {
|
|
ALOGE("Zip: failed to map central directory (offset %" PRId64 ", size %zu): %s",
|
|
cd_start_offset, cd_size, strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
CHECK_EQ(directory_map->size(), cd_size);
|
|
central_directory.Initialize(directory_map->data(), 0 /*offset*/, cd_size);
|
|
} else {
|
|
if (mapped_zip.GetBasePtr() == nullptr) {
|
|
ALOGE("Zip: Failed to map central directory, bad mapped_zip base pointer");
|
|
return false;
|
|
}
|
|
if (static_cast<off64_t>(cd_start_offset) + static_cast<off64_t>(cd_size) >
|
|
mapped_zip.GetFileLength()) {
|
|
ALOGE(
|
|
"Zip: Failed to map central directory, offset exceeds mapped memory region ("
|
|
"start_offset %" PRId64 ", cd_size %zu, mapped_region_size %" PRId64 ")",
|
|
static_cast<int64_t>(cd_start_offset), cd_size, mapped_zip.GetFileLength());
|
|
return false;
|
|
}
|
|
|
|
central_directory.Initialize(mapped_zip.GetBasePtr(), cd_start_offset, cd_size);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// This function returns the embedded timestamp as is and doesn't perform validation.
|
|
tm ZipEntryCommon::GetModificationTime() const {
|
|
tm t = {};
|
|
|
|
t.tm_hour = (mod_time >> 11) & 0x1f;
|
|
t.tm_min = (mod_time >> 5) & 0x3f;
|
|
t.tm_sec = (mod_time & 0x1f) << 1;
|
|
|
|
t.tm_year = ((mod_time >> 25) & 0x7f) + 80;
|
|
t.tm_mon = ((mod_time >> 21) & 0xf) - 1;
|
|
t.tm_mday = (mod_time >> 16) & 0x1f;
|
|
|
|
return t;
|
|
}
|
|
|
|
namespace zip_archive {
|
|
|
|
int32_t Inflate(const Reader& reader, const uint64_t compressed_length,
|
|
const uint64_t uncompressed_length, Writer* writer,
|
|
uint64_t* crc_out) {
|
|
return inflateImpl<false>(reader, compressed_length, uncompressed_length,
|
|
writer, crc_out);
|
|
}
|
|
|
|
//
|
|
// ZIPARCHIVE_DISABLE_CALLBACK_API disables all APIs that accept user callbacks.
|
|
// It gets defined for the incfs-supporting version of libziparchive, where one
|
|
// has to control all the code accessing the archive. See more at
|
|
// incfs_support/signal_handling.h
|
|
//
|
|
#if !ZIPARCHIVE_DISABLE_CALLBACK_API
|
|
|
|
int32_t ExtractToWriter(ZipArchiveHandle handle, const ZipEntry64* entry,
|
|
zip_archive::Writer* writer) {
|
|
return extractToWriter(handle, entry, writer);
|
|
}
|
|
|
|
#endif // !ZIPARCHIVE_DISABLE_CALLBACK_API
|
|
|
|
} // namespace zip_archive
|