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Merge "applypatch: Restrict applypatch_check to eMMC targets."

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This commit is contained in:
Tao Bao
2018-07-10 06:19:19 +00:00
committed by Gerrit Code Review
parent b9b50cd58c 7c1d426dbc
commit e02cbaaa62
4 changed files with 67 additions and 100 deletions
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22
applypatch/applypatch.cpp
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@@ -376,24 +376,26 @@ static int FindMatchingPatch(const uint8_t* sha1, const std::vector<std::string>
return -1;
}
int applypatch_check(const char* filename, const std::vector<std::string>& patch_sha1s) {
// It's okay to specify no SHA-1s; the check will pass if the LoadFileContents is successful.
// (Useful for reading partitions, where the filename encodes the SHA-1s; no need to check them
// twice.)
int applypatch_check(const std::string& filename, const std::vector<std::string>& sha1s) {
if (!android::base::StartsWith(filename, "EMMC:")) {
return 1;
}
// The check will pass if LoadPartitionContents is successful, because the filename already
// encodes the desired SHA-1s.
FileContents file;
if (LoadFileContents(filename, &file) != 0 ||
(!patch_sha1s.empty() && FindMatchingPatch(file.sha1, patch_sha1s) < 0)) {
if (LoadPartitionContents(filename, &file) != 0) {
LOG(INFO) << "\"" << filename << "\" doesn't have any of expected SHA-1 sums; checking cache";
// If the source file is missing or corrupted, it might be because we were killed in the middle
// of patching it. A copy should have been made in cache_temp_source. If that file exists and
// matches the SHA-1 we're looking for, the check still passes.
// If the partition is corrupted, it might be because we were killed in the middle of patching
// it. A copy should have been made in cache_temp_source. If that file exists and matches the
// SHA-1 we're looking for, the check still passes.
if (LoadFileContents(Paths::Get().cache_temp_source(), &file) != 0) {
LOG(ERROR) << "Failed to load cache file";
return 1;
}
if (FindMatchingPatch(file.sha1, patch_sha1s) < 0) {
if (FindMatchingPatch(file.sha1, sha1s) < 0) {
LOG(ERROR) << "The cache bits don't match any SHA-1 for \"" << filename << "\"";
return 1;
}

7
applypatch/include/applypatch/applypatch.h
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@@ -78,9 +78,10 @@ int applypatch(const char* source_filename, const char* target_filename,
const std::vector<std::string>& patch_sha1s,
const std::vector<std::unique_ptr<Value>>& patch_data, const Value* bonus_data);
// Returns 0 if the contents of the file or the cached file match any of the given SHA-1's. Returns
// nonzero otherwise.
int applypatch_check(const char* filename, const std::vector<std::string>& patch_sha1s);
// Returns 0 if the contents of the eMMC target or the cached file match any of the given SHA-1's.
// Returns nonzero otherwise. 'filename' must refer to an eMMC partition target. It would only use
// 'sha1s' to find a match on /cache if the hashes embedded in the filename fail to match.
int applypatch_check(const std::string& filename, const std::vector<std::string>& sha1s);
// Flashes a given image to the target partition. It verifies the target cheksum first, and will
// return if target already has the desired hash. Otherwise it checks the checksum of the given

4
tests/component/updater_test.cpp
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@@ -250,8 +250,10 @@ TEST_F(UpdaterTest, apply_patch_check) {
expect("t", cmd.c_str(), kNoCause);
// Multiple arguments.
// As long as it successfully loads the partition specified in filename, it won't check against
// any given SHAs.
cmd = "apply_patch_check(\"" + filename + "\", \"wrong_sha1\", \"wrong_sha2\")";
expect("", cmd.c_str(), kNoCause);
expect("t", cmd.c_str(), kNoCause);
cmd = "apply_patch_check(\"" + filename + "\", \"wrong_sha1\", \"" + src_hash +
"\", \"wrong_sha2\")";

134
tests/unit/applypatch_test.cpp
View File

@@ -33,7 +33,6 @@
#include <android-base/test_utils.h>
#include <android-base/unique_fd.h>
#include <gtest/gtest.h>
#include <openssl/sha.h>
#include "applypatch/applypatch.h"
#include "common/test_constants.h"
@@ -42,139 +41,102 @@
using namespace std::string_literals;
static void sha1sum(const std::string& fname, std::string* sha1, size_t* fsize = nullptr) {
ASSERT_TRUE(sha1 != nullptr);
std::string data;
ASSERT_TRUE(android::base::ReadFileToString(fname, &data));
if (fsize != nullptr) {
*fsize = data.size();
}
uint8_t digest[SHA_DIGEST_LENGTH];
SHA1(reinterpret_cast<const uint8_t*>(data.c_str()), data.size(), digest);
*sha1 = print_sha1(digest);
}
static void mangle_file(const std::string& fname) {
std::string content(1024, '\0');
for (size_t i = 0; i < 1024; i++) {
content[i] = rand() % 256;
}
ASSERT_TRUE(android::base::WriteStringToFile(content, fname));
}
class ApplyPatchTest : public ::testing::Test {
public:
protected:
void SetUp() override {
// set up files
old_file = from_testdata_base("old.file");
new_file = from_testdata_base("new.file");
nonexistent_file = from_testdata_base("nonexistent.file");
FileContents old_fc;
ASSERT_EQ(0, LoadFileContents(old_file, &old_fc));
old_sha1 = print_sha1(old_fc.sha1);
old_size = old_fc.data.size();
new_file = from_testdata_base("new.file");
FileContents new_fc;
ASSERT_EQ(0, LoadFileContents(new_file, &new_fc));
new_sha1 = print_sha1(new_fc.sha1);
new_size = new_fc.data.size();
// set up SHA constants
sha1sum(old_file, &old_sha1, &old_size);
sha1sum(new_file, &new_sha1, &new_size);
srand(time(nullptr));
bad_sha1_a = android::base::StringPrintf("%040x", rand());
bad_sha1_b = android::base::StringPrintf("%040x", rand());
// Reset the cache backup file.
Paths::Get().set_cache_temp_source("/cache/saved.file");
}
std::string old_file;
std::string new_file;
std::string nonexistent_file;
std::string old_sha1;
size_t old_size;
std::string new_file;
std::string new_sha1;
size_t new_size;
std::string bad_sha1_a;
std::string bad_sha1_b;
size_t old_size;
size_t new_size;
};
TEST_F(ApplyPatchTest, CheckModeSkip) {
std::vector<std::string> sha1s;
ASSERT_EQ(0, applypatch_check(&old_file[0], sha1s));
TEST_F(ApplyPatchTest, CheckMode) {
std::string partition = "EMMC:" + old_file + ":" + std::to_string(old_size) + ":" + old_sha1;
ASSERT_EQ(0, applypatch_check(partition, {}));
ASSERT_EQ(0, applypatch_check(partition, { old_sha1 }));
ASSERT_EQ(0, applypatch_check(partition, { bad_sha1_a, bad_sha1_b }));
ASSERT_EQ(0, applypatch_check(partition, { bad_sha1_a, old_sha1, bad_sha1_b }));
}
TEST_F(ApplyPatchTest, CheckModeSingle) {
std::vector<std::string> sha1s = { old_sha1 };
ASSERT_EQ(0, applypatch_check(&old_file[0], sha1s));
TEST_F(ApplyPatchTest, CheckMode_NonEmmcTarget) {
ASSERT_NE(0, applypatch_check(old_file, {}));
ASSERT_NE(0, applypatch_check(old_file, { old_sha1 }));
ASSERT_NE(0, applypatch_check(old_file, { bad_sha1_a, bad_sha1_b }));
ASSERT_NE(0, applypatch_check(old_file, { bad_sha1_a, old_sha1, bad_sha1_b }));
}
TEST_F(ApplyPatchTest, CheckModeMultiple) {
std::vector<std::string> sha1s = { bad_sha1_a, old_sha1, bad_sha1_b };
ASSERT_EQ(0, applypatch_check(&old_file[0], sha1s));
}
TEST_F(ApplyPatchTest, CheckModeFailure) {
std::vector<std::string> sha1s = { bad_sha1_a, bad_sha1_b };
ASSERT_NE(0, applypatch_check(&old_file[0], sha1s));
}
TEST_F(ApplyPatchTest, CheckModeEmmcTarget) {
TEST_F(ApplyPatchTest, CheckMode_EmmcTarget) {
// EMMC:old_file:size:sha1 should pass the check.
std::string src_file = "EMMC:" + old_file + ":" + std::to_string(old_size) + ":" + old_sha1;
std::vector<std::string> sha1s;
ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));
ASSERT_EQ(0, applypatch_check(src_file, {}));
// EMMC:old_file:(size-1):sha1:(size+1):sha1 should fail the check.
src_file = "EMMC:" + old_file + ":" + std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
std::to_string(old_size + 1) + ":" + old_sha1;
ASSERT_EQ(1, applypatch_check(src_file.c_str(), sha1s));
ASSERT_NE(0, applypatch_check(src_file, {}));
// EMMC:old_file:(size-1):sha1:size:sha1:(size+1):sha1 should pass the check.
src_file = "EMMC:" + old_file + ":" + std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
std::to_string(old_size) + ":" + old_sha1 + ":" + std::to_string(old_size + 1) + ":" +
old_sha1;
ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));
ASSERT_EQ(0, applypatch_check(src_file, {}));
// EMMC:old_file:(size+1):sha1:(size-1):sha1:size:sha1 should pass the check.
src_file = "EMMC:" + old_file + ":" + std::to_string(old_size + 1) + ":" + old_sha1 + ":" +
std::to_string(old_size - 1) + ":" + old_sha1 + ":" + std::to_string(old_size) + ":" +
old_sha1;
ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));
ASSERT_EQ(0, applypatch_check(src_file, {}));
// EMMC:new_file:(size+1):old_sha1:(size-1):old_sha1:size:old_sha1:size:new_sha1
// should pass the check.
src_file = "EMMC:" + new_file + ":" + std::to_string(old_size + 1) + ":" + old_sha1 + ":" +
std::to_string(old_size - 1) + ":" + old_sha1 + ":" + std::to_string(old_size) + ":" +
old_sha1 + ":" + std::to_string(new_size) + ":" + new_sha1;
ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));
ASSERT_EQ(0, applypatch_check(src_file, {}));
}
class ApplyPatchCacheTest : public ApplyPatchTest {
protected:
void SetUp() override {
ApplyPatchTest::SetUp();
Paths::Get().set_cache_temp_source(old_file);
}
};
TEST_F(ApplyPatchTest, CheckMode_UseBackup) {
std::string corrupted = "EMMC:" + old_file + ":" + std::to_string(old_size) + ":" + bad_sha1_a;
ASSERT_NE(0, applypatch_check(corrupted, { old_sha1 }));
TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSourceSingle) {
TemporaryFile temp_file;
mangle_file(temp_file.path);
std::vector<std::string> sha1s_single = { old_sha1 };
ASSERT_EQ(0, applypatch_check(temp_file.path, sha1s_single));
ASSERT_EQ(0, applypatch_check(nonexistent_file.c_str(), sha1s_single));
Paths::Get().set_cache_temp_source(old_file);
ASSERT_EQ(0, applypatch_check(corrupted, { old_sha1 }));
ASSERT_EQ(0, applypatch_check(corrupted, { bad_sha1_a, old_sha1, bad_sha1_b }));
}
TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSourceMultiple) {
TemporaryFile temp_file;
mangle_file(temp_file.path);
std::vector<std::string> sha1s_multiple = { bad_sha1_a, old_sha1, bad_sha1_b };
ASSERT_EQ(0, applypatch_check(temp_file.path, sha1s_multiple));
ASSERT_EQ(0, applypatch_check(nonexistent_file.c_str(), sha1s_multiple));
}
TEST_F(ApplyPatchTest, CheckMode_UseBackup_BothCorrupted) {
std::string corrupted = "EMMC:" + old_file + ":" + std::to_string(old_size) + ":" + bad_sha1_a;
ASSERT_NE(0, applypatch_check(corrupted, {}));
ASSERT_NE(0, applypatch_check(corrupted, { old_sha1 }));
TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSourceFailure) {
TemporaryFile temp_file;
mangle_file(temp_file.path);
std::vector<std::string> sha1s_failure = { bad_sha1_a, bad_sha1_b };
ASSERT_NE(0, applypatch_check(temp_file.path, sha1s_failure));
ASSERT_NE(0, applypatch_check(nonexistent_file.c_str(), sha1s_failure));
Paths::Get().set_cache_temp_source(old_file);
ASSERT_NE(0, applypatch_check(corrupted, { bad_sha1_a, bad_sha1_b }));
}
class FreeCacheTest : public ::testing::Test {