Merge "Refactor update_verifier into a class"
am: ff29eb7f12
Change-Id: Ibecfa11ad96f9b34c1c9a0096f5096e798a18054
diff --git a/tests/component/update_verifier_test.cpp b/tests/component/update_verifier_test.cpp
index a970716..543e427 100644
--- a/tests/component/update_verifier_test.cpp
+++ b/tests/component/update_verifier_test.cpp
@@ -29,19 +29,29 @@
#include "care_map.pb.h"
+using namespace std::string_literals;
+
class UpdateVerifierTest : public ::testing::Test {
protected:
void SetUp() override {
std::string verity_mode = android::base::GetProperty("ro.boot.veritymode", "");
verity_supported = android::base::EqualsIgnoreCase(verity_mode, "enforcing");
+
+ care_map_pb_ = care_map_dir_.path + "/care_map.pb"s;
+ care_map_txt_ = care_map_dir_.path + "/care_map.txt"s;
+ }
+
+ void TearDown() override {
+ unlink(care_map_pb_.c_str());
+ unlink(care_map_txt_.c_str());
}
// Returns a serialized string of the proto3 message according to the given partition info.
std::string ConstructProto(
std::vector<std::unordered_map<std::string, std::string>>& partitions) {
- UpdateVerifier::CareMap result;
+ recovery_update_verifier::CareMap result;
for (const auto& partition : partitions) {
- UpdateVerifier::CareMap::PartitionInfo info;
+ recovery_update_verifier::CareMap::PartitionInfo info;
if (partition.find("name") != partition.end()) {
info.set_name(partition.at("name"));
}
@@ -59,12 +69,16 @@
}
bool verity_supported;
- TemporaryFile care_map_file;
+ UpdateVerifier verifier_;
+
+ TemporaryDir care_map_dir_;
+ std::string care_map_pb_;
+ std::string care_map_txt_;
};
TEST_F(UpdateVerifierTest, verify_image_no_care_map) {
// Non-existing care_map is allowed.
- ASSERT_TRUE(verify_image("/doesntexist"));
+ ASSERT_FALSE(verifier_.ParseCareMap("/doesntexist"));
}
TEST_F(UpdateVerifierTest, verify_image_smoke) {
@@ -75,25 +89,27 @@
}
std::string content = "system\n2,0,1";
- ASSERT_TRUE(android::base::WriteStringToFile(content, care_map_file.path));
- ASSERT_TRUE(verify_image(care_map_file.path));
+ ASSERT_TRUE(android::base::WriteStringToFile(content, care_map_txt_));
+ ASSERT_TRUE(verifier_.ParseCareMap(care_map_txt_));
+ ASSERT_TRUE(verifier_.VerifyPartitions());
// Leading and trailing newlines should be accepted.
- ASSERT_TRUE(android::base::WriteStringToFile("\n" + content + "\n\n", care_map_file.path));
- ASSERT_TRUE(verify_image(care_map_file.path));
+ ASSERT_TRUE(android::base::WriteStringToFile("\n" + content + "\n\n", care_map_txt_));
+ ASSERT_TRUE(verifier_.ParseCareMap(care_map_txt_));
+ ASSERT_TRUE(verifier_.VerifyPartitions());
}
TEST_F(UpdateVerifierTest, verify_image_empty_care_map) {
- ASSERT_FALSE(verify_image(care_map_file.path));
+ ASSERT_FALSE(verifier_.ParseCareMap(care_map_txt_));
}
TEST_F(UpdateVerifierTest, verify_image_wrong_lines) {
// The care map file can have only 2 / 4 / 6 lines.
- ASSERT_TRUE(android::base::WriteStringToFile("line1", care_map_file.path));
- ASSERT_FALSE(verify_image(care_map_file.path));
+ ASSERT_TRUE(android::base::WriteStringToFile("line1", care_map_txt_));
+ ASSERT_FALSE(verifier_.ParseCareMap(care_map_txt_));
- ASSERT_TRUE(android::base::WriteStringToFile("line1\nline2\nline3", care_map_file.path));
- ASSERT_FALSE(verify_image(care_map_file.path));
+ ASSERT_TRUE(android::base::WriteStringToFile("line1\nline2\nline3", care_map_txt_));
+ ASSERT_FALSE(verifier_.ParseCareMap(care_map_txt_));
}
TEST_F(UpdateVerifierTest, verify_image_malformed_care_map) {
@@ -104,8 +120,8 @@
}
std::string content = "system\n2,1,0";
- ASSERT_TRUE(android::base::WriteStringToFile(content, care_map_file.path));
- ASSERT_FALSE(verify_image(care_map_file.path));
+ ASSERT_TRUE(android::base::WriteStringToFile(content, care_map_txt_));
+ ASSERT_FALSE(verifier_.ParseCareMap(care_map_txt_));
}
TEST_F(UpdateVerifierTest, verify_image_legacy_care_map) {
@@ -116,8 +132,8 @@
}
std::string content = "/dev/block/bootdevice/by-name/system\n2,1,0";
- ASSERT_TRUE(android::base::WriteStringToFile(content, care_map_file.path));
- ASSERT_TRUE(verify_image(care_map_file.path));
+ ASSERT_TRUE(android::base::WriteStringToFile(content, care_map_txt_));
+ ASSERT_FALSE(verifier_.ParseCareMap(care_map_txt_));
}
TEST_F(UpdateVerifierTest, verify_image_protobuf_care_map_smoke) {
@@ -132,8 +148,9 @@
};
std::string proto = ConstructProto(partitions);
- ASSERT_TRUE(android::base::WriteStringToFile(proto, care_map_file.path));
- ASSERT_TRUE(verify_image(care_map_file.path));
+ ASSERT_TRUE(android::base::WriteStringToFile(proto, care_map_pb_));
+ ASSERT_TRUE(verifier_.ParseCareMap(care_map_pb_));
+ ASSERT_TRUE(verifier_.VerifyPartitions());
}
TEST_F(UpdateVerifierTest, verify_image_protobuf_care_map_missing_name) {
@@ -148,8 +165,8 @@
};
std::string proto = ConstructProto(partitions);
- ASSERT_TRUE(android::base::WriteStringToFile(proto, care_map_file.path));
- ASSERT_FALSE(verify_image(care_map_file.path));
+ ASSERT_TRUE(android::base::WriteStringToFile(proto, care_map_pb_));
+ ASSERT_FALSE(verifier_.ParseCareMap(care_map_pb_));
}
TEST_F(UpdateVerifierTest, verify_image_protobuf_care_map_bad_ranges) {
@@ -164,6 +181,6 @@
};
std::string proto = ConstructProto(partitions);
- ASSERT_TRUE(android::base::WriteStringToFile(proto, care_map_file.path));
- ASSERT_FALSE(verify_image(care_map_file.path));
+ ASSERT_TRUE(android::base::WriteStringToFile(proto, care_map_pb_));
+ ASSERT_FALSE(verifier_.ParseCareMap(care_map_pb_));
}
diff --git a/update_verifier/Android.bp b/update_verifier/Android.bp
index 7a860a1..1b84619 100644
--- a/update_verifier/Android.bp
+++ b/update_verifier/Android.bp
@@ -15,9 +15,8 @@
cc_defaults {
name: "update_verifier_defaults",
- cflags: [
- "-Wall",
- "-Werror",
+ defaults: [
+ "recovery_defaults",
],
local_include_dirs: [
diff --git a/update_verifier/care_map.proto b/update_verifier/care_map.proto
index 442ddd4..15d3afa 100644
--- a/update_verifier/care_map.proto
+++ b/update_verifier/care_map.proto
@@ -16,7 +16,7 @@
syntax = "proto3";
-package UpdateVerifier;
+package recovery_update_verifier;
option optimize_for = LITE_RUNTIME;
message CareMap {
diff --git a/update_verifier/include/update_verifier/update_verifier.h b/update_verifier/include/update_verifier/update_verifier.h
index 534384e..bdfabed 100644
--- a/update_verifier/include/update_verifier/update_verifier.h
+++ b/update_verifier/include/update_verifier/update_verifier.h
@@ -16,17 +16,45 @@
#pragma once
+#include <map>
#include <string>
+#include <vector>
-int update_verifier(int argc, char** argv);
+#include "otautil/rangeset.h"
-// Returns true to indicate a passing verification (or the error should be ignored); Otherwise
-// returns false on fatal errors, where we should reject the current boot and trigger a fallback.
-// This function tries to process the care_map.txt as protobuf message; and falls back to use the
-// plain text format if the parse failed.
-//
+// The update verifier performs verification upon the first boot to a new slot on A/B devices.
+// During the verification, it reads all the blocks in the care_map. And if a failure happens,
+// it rejects the current boot and triggers a fallback.
+
// Note that update_verifier should be backward compatible to not reject care_map.txt from old
// releases, which could otherwise fail to boot into the new release. For example, we've changed
// the care_map format between N and O. An O update_verifier would fail to work with N care_map.txt.
// This could be a result of sideloading an O OTA while the device having a pending N update.
-bool verify_image(const std::string& care_map_name);
+int update_verifier(int argc, char** argv);
+
+// The UpdateVerifier parses the content in the care map, and continues to verify the
+// partitions by reading the cared blocks if there's no format error in the file. Otherwise,
+// it should skip the verification to avoid bricking the device.
+class UpdateVerifier {
+ public:
+ // This function tries to process the care_map.pb as protobuf message; and falls back to use
+ // care_map.txt if the pb format file doesn't exist. If the parsing succeeds, put the result of
+ // the pair <partition_name, ranges> into the |partition_map_|.
+ bool ParseCareMap(const std::string& file_name = "");
+
+ // Verifies the new boot by reading all the cared blocks for partitions in |partition_map_|.
+ bool VerifyPartitions();
+
+ private:
+ // Parses the legacy care_map.txt in plain text format.
+ bool ParseCareMapPlainText(const std::string& content);
+
+ // Finds all the dm-enabled partitions, and returns a map of <partition_name, block_device>.
+ std::map<std::string, std::string> FindDmPartitions();
+
+ // Returns true if we successfully read the blocks in |ranges| of the |dm_block_device|.
+ bool ReadBlocks(const std::string partition_name, const std::string& dm_block_device,
+ const RangeSet& ranges);
+
+ std::map<std::string, RangeSet> partition_map_;
+};
diff --git a/update_verifier/update_verifier.cpp b/update_verifier/update_verifier.cpp
index 5e5aa18..6e86ac9 100644
--- a/update_verifier/update_verifier.cpp
+++ b/update_verifier/update_verifier.cpp
@@ -48,8 +48,6 @@
#include <algorithm>
#include <future>
-#include <string>
-#include <vector>
#include <android-base/file.h>
#include <android-base/logging.h>
@@ -61,7 +59,6 @@
#include <cutils/android_reboot.h>
#include "care_map.pb.h"
-#include "otautil/rangeset.h"
using android::sp;
using android::hardware::boot::V1_0::IBootControl;
@@ -76,29 +73,25 @@
return 0;
}
-static bool read_blocks(const std::string& partition, const std::string& range_str) {
- if (partition != "system" && partition != "vendor" && partition != "product") {
- LOG(ERROR) << "Invalid partition name \"" << partition << "\"";
- return false;
- }
- // Iterate the content of "/sys/block/dm-X/dm/name". If it matches one of "system", "vendor" or
- // "product", then dm-X is a dm-wrapped device for that target. We will later read all the
- // ("cared") blocks from "/dev/block/dm-X" to ensure the target partition's integrity.
+// Iterate the content of "/sys/block/dm-X/dm/name" and find all the dm-wrapped block devices.
+// We will later read all the ("cared") blocks from "/dev/block/dm-X" to ensure the target
+// partition's integrity.
+std::map<std::string, std::string> UpdateVerifier::FindDmPartitions() {
static constexpr auto DM_PATH_PREFIX = "/sys/block/";
dirent** namelist;
int n = scandir(DM_PATH_PREFIX, &namelist, dm_name_filter, alphasort);
if (n == -1) {
PLOG(ERROR) << "Failed to scan dir " << DM_PATH_PREFIX;
- return false;
+ return {};
}
if (n == 0) {
- LOG(ERROR) << "dm block device not found for " << partition;
- return false;
+ LOG(ERROR) << "No dm block device found.";
+ return {};
}
static constexpr auto DM_PATH_SUFFIX = "/dm/name";
static constexpr auto DEV_PATH = "/dev/block/";
- std::string dm_block_device;
+ std::map<std::string, std::string> dm_block_devices;
while (n--) {
std::string path = DM_PATH_PREFIX + std::string(namelist[n]->d_name) + DM_PATH_SUFFIX;
std::string content;
@@ -110,33 +103,18 @@
if (dm_block_name == "vroot") {
dm_block_name = "system";
}
- if (dm_block_name == partition) {
- dm_block_device = DEV_PATH + std::string(namelist[n]->d_name);
- while (n--) {
- free(namelist[n]);
- }
- break;
- }
+
+ dm_block_devices.emplace(dm_block_name, DEV_PATH + std::string(namelist[n]->d_name));
}
free(namelist[n]);
}
free(namelist);
- if (dm_block_device.empty()) {
- LOG(ERROR) << "Failed to find dm block device for " << partition;
- return false;
- }
+ return dm_block_devices;
+}
- // For block range string, first integer 'count' equals 2 * total number of valid ranges,
- // followed by 'count' number comma separated integers. Every two integers reprensent a
- // block range with the first number included in range but second number not included.
- // For example '4,64536,65343,74149,74150' represents: [64536,65343) and [74149,74150).
- RangeSet ranges = RangeSet::Parse(range_str);
- if (!ranges) {
- LOG(ERROR) << "Error parsing RangeSet string " << range_str;
- return false;
- }
-
+bool UpdateVerifier::ReadBlocks(const std::string partition_name,
+ const std::string& dm_block_device, const RangeSet& ranges) {
// RangeSet::Split() splits the ranges into multiple groups with same number of blocks (except for
// the last group).
size_t thread_num = std::thread::hardware_concurrency() ?: 4;
@@ -144,10 +122,10 @@
std::vector<std::future<bool>> threads;
for (const auto& group : groups) {
- auto thread_func = [&group, &dm_block_device, &partition]() {
+ auto thread_func = [&group, &dm_block_device, &partition_name]() {
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(dm_block_device.c_str(), O_RDONLY)));
if (fd.get() == -1) {
- PLOG(ERROR) << "Error reading " << dm_block_device << " for partition " << partition;
+ PLOG(ERROR) << "Error reading " << dm_block_device << " for partition " << partition_name;
return false;
}
@@ -155,9 +133,7 @@
std::vector<uint8_t> buf(1024 * kBlockSize);
size_t block_count = 0;
- for (const auto& range : group) {
- size_t range_start = range.first;
- size_t range_end = range.second;
+ for (const auto& [range_start, range_end] : group) {
if (lseek64(fd.get(), static_cast<off64_t>(range_start) * kBlockSize, SEEK_SET) == -1) {
PLOG(ERROR) << "lseek to " << range_start << " failed";
return false;
@@ -190,26 +166,20 @@
return ret;
}
-static bool process_care_map_plain_text(const std::string& care_map_contents) {
- // care_map file has up to six lines, where every two lines make a pair. Within each pair, the
- // first line has the partition name (e.g. "system"), while the second line holds the ranges of
- // all the blocks to verify.
- std::vector<std::string> lines =
- android::base::Split(android::base::Trim(care_map_contents), "\n");
- if (lines.size() != 2 && lines.size() != 4 && lines.size() != 6) {
- LOG(ERROR) << "Invalid lines in care_map: found " << lines.size()
- << " lines, expecting 2 or 4 or 6 lines.";
+bool UpdateVerifier::VerifyPartitions() {
+ auto dm_block_devices = FindDmPartitions();
+ if (dm_block_devices.empty()) {
+ LOG(ERROR) << "No dm-enabled block device is found.";
return false;
}
- for (size_t i = 0; i < lines.size(); i += 2) {
- // We're seeing an N care_map.txt. Skip the verification since it's not compatible with O
- // update_verifier (the last few metadata blocks can't be read via device mapper).
- if (android::base::StartsWith(lines[i], "/dev/block/")) {
- LOG(WARNING) << "Found legacy care_map.txt; skipped.";
- return true;
+ for (const auto& [partition_name, ranges] : partition_map_) {
+ if (dm_block_devices.find(partition_name) == dm_block_devices.end()) {
+ LOG(ERROR) << "Failed to find dm block device for " << partition_name;
+ return false;
}
- if (!read_blocks(lines[i], lines[i+1])) {
+
+ if (!ReadBlocks(partition_name, dm_block_devices.at(partition_name), ranges)) {
return false;
}
}
@@ -217,45 +187,109 @@
return true;
}
-bool verify_image(const std::string& care_map_name) {
+bool UpdateVerifier::ParseCareMapPlainText(const std::string& content) {
+ // care_map file has up to six lines, where every two lines make a pair. Within each pair, the
+ // first line has the partition name (e.g. "system"), while the second line holds the ranges of
+ // all the blocks to verify.
+ auto lines = android::base::Split(android::base::Trim(content), "\n");
+ if (lines.size() != 2 && lines.size() != 4 && lines.size() != 6) {
+ LOG(WARNING) << "Invalid lines in care_map: found " << lines.size()
+ << " lines, expecting 2 or 4 or 6 lines.";
+ return false;
+ }
+
+ for (size_t i = 0; i < lines.size(); i += 2) {
+ const std::string& partition_name = lines[i];
+ const std::string& range_str = lines[i + 1];
+ // We're seeing an N care_map.txt. Skip the verification since it's not compatible with O
+ // update_verifier (the last few metadata blocks can't be read via device mapper).
+ if (android::base::StartsWith(partition_name, "/dev/block/")) {
+ LOG(WARNING) << "Found legacy care_map.txt; skipped.";
+ return false;
+ }
+
+ // For block range string, first integer 'count' equals 2 * total number of valid ranges,
+ // followed by 'count' number comma separated integers. Every two integers reprensent a
+ // block range with the first number included in range but second number not included.
+ // For example '4,64536,65343,74149,74150' represents: [64536,65343) and [74149,74150).
+ RangeSet ranges = RangeSet::Parse(range_str);
+ if (!ranges) {
+ LOG(WARNING) << "Error parsing RangeSet string " << range_str;
+ return false;
+ }
+
+ partition_map_.emplace(partition_name, ranges);
+ }
+
+ return true;
+}
+
+bool UpdateVerifier::ParseCareMap(const std::string& file_name) {
+ partition_map_.clear();
+
+ std::string care_map_name = file_name;
+ if (care_map_name.empty()) {
+ std::string care_map_prefix = "/data/ota_package/care_map";
+ care_map_name = care_map_prefix + ".pb";
+ if (access(care_map_name.c_str(), R_OK) == -1) {
+ LOG(WARNING) << care_map_name
+ << " doesn't exist, falling back to read the care_map in plain text format.";
+ care_map_name = care_map_prefix + ".txt";
+ }
+ }
+
android::base::unique_fd care_map_fd(TEMP_FAILURE_RETRY(open(care_map_name.c_str(), O_RDONLY)));
// If the device is flashed before the current boot, it may not have care_map.txt in
// /data/ota_package. To allow the device to continue booting in this situation, we should
// print a warning and skip the block verification.
if (care_map_fd.get() == -1) {
PLOG(WARNING) << "Failed to open " << care_map_name;
- return true;
+ return false;
}
std::string file_content;
if (!android::base::ReadFdToString(care_map_fd.get(), &file_content)) {
- PLOG(ERROR) << "Failed to read " << care_map_name;
+ PLOG(WARNING) << "Failed to read " << care_map_name;
return false;
}
if (file_content.empty()) {
- LOG(ERROR) << "Unexpected empty care map";
+ LOG(WARNING) << "Unexpected empty care map";
return false;
}
- UpdateVerifier::CareMap care_map;
- // Falls back to use the plain text version if we cannot parse the file as protobuf message.
+ if (android::base::EndsWith(care_map_name, ".txt")) {
+ return ParseCareMapPlainText(file_content);
+ }
+
+ recovery_update_verifier::CareMap care_map;
if (!care_map.ParseFromString(file_content)) {
- return process_care_map_plain_text(file_content);
+ LOG(WARNING) << "Failed to parse " << care_map_name << " in protobuf format.";
+ return false;
}
for (const auto& partition : care_map.partitions()) {
if (partition.name().empty()) {
- LOG(ERROR) << "Unexpected empty partition name.";
+ LOG(WARNING) << "Unexpected empty partition name.";
return false;
}
if (partition.ranges().empty()) {
- LOG(ERROR) << "Unexpected block ranges for partition " << partition.name();
+ LOG(WARNING) << "Unexpected block ranges for partition " << partition.name();
return false;
}
- if (!read_blocks(partition.name(), partition.ranges())) {
+ RangeSet ranges = RangeSet::Parse(partition.ranges());
+ if (!ranges) {
+ LOG(WARNING) << "Error parsing RangeSet string " << partition.ranges();
return false;
}
+
+ // TODO(xunchang) compare the fingerprint of the partition.
+ partition_map_.emplace(partition.name(), ranges);
+ }
+
+ if (partition_map_.empty()) {
+ LOG(WARNING) << "No partition to verify";
+ return false;
}
return true;
@@ -308,8 +342,10 @@
}
if (!skip_verification) {
- static constexpr auto CARE_MAP_FILE = "/data/ota_package/care_map.txt";
- if (!verify_image(CARE_MAP_FILE)) {
+ UpdateVerifier verifier;
+ if (!verifier.ParseCareMap()) {
+ LOG(WARNING) << "Failed to parse the care map file, skipping verification";
+ } else if (!verifier.VerifyPartitions()) {
LOG(ERROR) << "Failed to verify all blocks in care map file.";
return reboot_device();
}