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DO NOT MERGE : Fix build breakage due to 2d516d2d46.

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Test: make
Test: zip_archive_test
Bug: 64211847

Change-Id: Ide48ce66542e152d88520dcd6abcd104e48137f6
This commit is contained in:
Narayan Kamath 2017-09-14 10:41:28 +01:00
parent 64406ab149
commit 547c7d9a0b
2 changed files with 35 additions and 31 deletions
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50
libziparchive/zip_archive.cc
View file

@ -594,6 +594,29 @@ static int32_t MapCentralDirectory(int fd, const char* debug_file_name,
return result;
}
// Attempts to read |len| bytes into |buf| at offset |off|.
//
// This method uses pread64 on platforms that support it and
// lseek64 + read on platforms that don't. This implies that
// callers should not rely on the |fd| offset being incremented
// as a side effect of this call.
static inline ssize_t ReadAtOffset(int fd, uint8_t* buf, size_t len,
off64_t off) {
#ifdef HAVE_PREAD
return TEMP_FAILURE_RETRY(pread64(fd, buf, len, off));
#else
// The only supported platform that doesn't support pread at the moment
// is Windows. Only recent versions of windows support unix like forks,
// and even there the semantics are quite different.
if (lseek64(fd, off, SEEK_SET) != off) {
ALOGW("Zip: failed seek to offset %" PRId64, off);
return kIoError;
}
return TEMP_FAILURE_RETRY(read(fd, buf, len));
#endif // HAVE_PREAD
}
/*
* Parses the Zip archive's Central Directory. Allocates and populates the
* hash table.
@ -672,8 +695,8 @@ static int32_t ParseZipArchive(ZipArchive* archive) {
}
uint32_t lfh_start_bytes;
if (!archive->mapped_zip.ReadAtOffset(reinterpret_cast<uint8_t*>(&lfh_start_bytes),
sizeof(uint32_t), 0)) {
if (ReadAtOffset(archive->fd, reinterpret_cast<uint8_t*>(&lfh_start_bytes),
sizeof(uint32_t), 0) != sizeof(uint32_t)) {
ALOGW("Zip: Unable to read header for entry at offset == 0.");
return -1;
}
@ -755,29 +778,6 @@ static int32_t UpdateEntryFromDataDescriptor(int fd,
return 0;
}
// Attempts to read |len| bytes into |buf| at offset |off|.
//
// This method uses pread64 on platforms that support it and
// lseek64 + read on platforms that don't. This implies that
// callers should not rely on the |fd| offset being incremented
// as a side effect of this call.
static inline ssize_t ReadAtOffset(int fd, uint8_t* buf, size_t len,
off64_t off) {
#ifdef HAVE_PREAD
return TEMP_FAILURE_RETRY(pread64(fd, buf, len, off));
#else
// The only supported platform that doesn't support pread at the moment
// is Windows. Only recent versions of windows support unix like forks,
// and even there the semantics are quite different.
if (lseek64(fd, off, SEEK_SET) != off) {
ALOGW("Zip: failed seek to offset %" PRId64, off);
return kIoError;
}
return TEMP_FAILURE_RETRY(read(fd, buf, len));
#endif // HAVE_PREAD
}
static int32_t FindEntry(const ZipArchive* archive, const int ent,
ZipEntry* data) {
const uint16_t nameLen = archive->hash_table[ent].name_length;

16
libziparchive/zip_archive_test.cc
View file

@ -266,7 +266,7 @@ TEST(ziparchive, ExtractToFile) {
// Manual changes :
// [2] = 0xff // Corrupt the LFH signature of entry 0.
// [3] = 0xff // Corrupt the LFH signature of entry 0.
static const std::vector<uint8_t> kZipFileWithBrokenLfhSignature{
static const uint8_t kZipFileWithBrokenLfhSignature[] = {
//[lfh-sig-----------], [lfh contents---------------------------------
0x50, 0x4b, 0xff, 0xff, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x77, 0x80,
//--------------------------------------------------------------------
@ -297,12 +297,16 @@ static const std::vector<uint8_t> kZipFileWithBrokenLfhSignature{
0x00, 0x00, 0x43, 0x00, 0x00, 0x00, 0x00, 0x00};
TEST(ziparchive, BrokenLfhSignature) {
TemporaryFile tmp_file;
ASSERT_NE(-1, tmp_file.fd);
ASSERT_TRUE(android::base::WriteFully(tmp_file.fd, &kZipFileWithBrokenLfhSignature[0],
kZipFileWithBrokenLfhSignature.size()));
char kTempFilePattern[] = "zip_archive_input_XXXXXX";
int fd = make_temporary_file(kTempFilePattern);
ASSERT_NE(-1, fd);
ASSERT_EQ(static_cast<int32_t>(sizeof(kZipFileWithBrokenLfhSignature)),
TEMP_FAILURE_RETRY(write(fd, kZipFileWithBrokenLfhSignature,
sizeof(kZipFileWithBrokenLfhSignature))));
ZipArchiveHandle handle;
ASSERT_EQ(-1, OpenArchiveFd(tmp_file.fd, "LeadingNonZipBytes", &handle));
ASSERT_EQ(-1, OpenArchiveFd(fd, "LeadingNonZipBytes", &handle));
close(fd);
}
int main(int argc, char** argv) {