Merge "Make update_verifier generic across verified boot versions."
diff --git a/tests/Android.mk b/tests/Android.mk
index b29ff50..fd44978 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -74,14 +74,6 @@
LOCAL_CFLAGS += -DAB_OTA_UPDATER=1
endif
-ifeq ($(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VERITY),true)
-LOCAL_CFLAGS += -DPRODUCT_SUPPORTS_VERITY=1
-endif
-
-ifeq ($(BOARD_AVB_ENABLE),true)
-LOCAL_CFLAGS += -DBOARD_AVB_ENABLE=1
-endif
-
LOCAL_MODULE := recovery_component_test
LOCAL_COMPATIBILITY_SUITE := device-tests
LOCAL_C_INCLUDES := bootable/recovery
diff --git a/tests/component/update_verifier_test.cpp b/tests/component/update_verifier_test.cpp
index 1544bb2..f6ef6dc 100644
--- a/tests/component/update_verifier_test.cpp
+++ b/tests/component/update_verifier_test.cpp
@@ -17,6 +17,8 @@
#include <string>
#include <android-base/file.h>
+#include <android-base/properties.h>
+#include <android-base/strings.h>
#include <android-base/test_utils.h>
#include <gtest/gtest.h>
#include <update_verifier/update_verifier.h>
@@ -24,11 +26,8 @@
class UpdateVerifierTest : public ::testing::Test {
protected:
void SetUp() override {
-#if defined(PRODUCT_SUPPORTS_VERITY) || defined(BOARD_AVB_ENABLE)
- verity_supported = true;
-#else
- verity_supported = false;
-#endif
+ std::string verity_mode = android::base::GetProperty("ro.boot.veritymode", "");
+ verity_supported = android::base::EqualsIgnoreCase(verity_mode, "enforcing");
}
bool verity_supported;
diff --git a/update_verifier/Android.mk b/update_verifier/Android.mk
index 0ff8854..8d61cd1 100644
--- a/update_verifier/Android.mk
+++ b/update_verifier/Android.mk
@@ -39,14 +39,6 @@
LOCAL_C_INCLUDES := \
$(LOCAL_PATH)/include
-ifeq ($(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VERITY),true)
-LOCAL_CFLAGS += -DPRODUCT_SUPPORTS_VERITY=1
-endif
-
-ifeq ($(BOARD_AVB_ENABLE),true)
-LOCAL_CFLAGS += -DBOARD_AVB_ENABLE=1
-endif
-
include $(BUILD_STATIC_LIBRARY)
# update_verifier (executable)
diff --git a/update_verifier/update_verifier.cpp b/update_verifier/update_verifier.cpp
index 92d9313..dc72763 100644
--- a/update_verifier/update_verifier.cpp
+++ b/update_verifier/update_verifier.cpp
@@ -15,24 +15,26 @@
*/
/*
- * This program verifies the integrity of the partitions after an A/B OTA
- * update. It gets invoked by init, and will only perform the verification if
- * it's the first boot post an A/B OTA update.
+ * update_verifier verifies the integrity of the partitions after an A/B OTA update. It gets invoked
+ * by init, and will only perform the verification if it's the first boot post an A/B OTA update
+ * (https://source.android.com/devices/tech/ota/ab/#after_reboot).
*
- * Update_verifier relies on dm-verity to capture any corruption on the partitions
- * being verified. And its behavior varies depending on the dm-verity mode.
- * Upon detection of failures:
+ * update_verifier relies on device-mapper-verity (dm-verity) to capture any corruption on the
+ * partitions being verified (https://source.android.com/security/verifiedboot). The verification
+ * will be skipped, if dm-verity is not enabled on the device.
+ *
+ * Upon detecting verification failures, the device will be rebooted, although the trigger of the
+ * reboot depends on the dm-verity mode.
* enforcing mode: dm-verity reboots the device
* eio mode: dm-verity fails the read and update_verifier reboots the device
* other mode: not supported and update_verifier reboots the device
*
- * After a predefined number of failing boot attempts, the bootloader should
- * mark the slot as unbootable and stops trying. Other dm-verity modes (
- * for example, veritymode=EIO) are not accepted and simply lead to a
- * verification failure.
+ * All these reboots prevent the device from booting into a known corrupt state. If the device
+ * continuously fails to boot into the new slot, the bootloader should mark the slot as unbootable
+ * and trigger a fallback to the old slot.
*
- * The current slot will be marked as having booted successfully if the
- * verifier reaches the end after the verification.
+ * The current slot will be marked as having booted successfully if the verifier reaches the end
+ * after the verification.
*/
#include "update_verifier/update_verifier.h"
@@ -103,12 +105,10 @@
PLOG(WARNING) << "Failed to read " << path;
} else {
std::string dm_block_name = android::base::Trim(content);
-#ifdef BOARD_AVB_ENABLE
// AVB is using 'vroot' for the root block device but we're expecting 'system'.
if (dm_block_name == "vroot") {
dm_block_name = "system";
}
-#endif
if (dm_block_name == partition) {
dm_block_device = DEV_PATH + std::string(namelist[n]->d_name);
while (n--) {
@@ -264,19 +264,13 @@
if (is_successful == BoolResult::FALSE) {
// The current slot has not booted successfully.
-#if defined(PRODUCT_SUPPORTS_VERITY) || defined(BOARD_AVB_ENABLE)
bool skip_verification = false;
std::string verity_mode = android::base::GetProperty("ro.boot.veritymode", "");
if (verity_mode.empty()) {
- // With AVB it's possible to disable verification entirely and
- // in this case ro.boot.veritymode is empty.
-#if defined(BOARD_AVB_ENABLE)
- LOG(WARNING) << "verification has been disabled; marking without verification.";
+ // Skip the verification if ro.boot.veritymode property is not set. This could be a result
+ // that device doesn't support dm-verity, or has disabled that.
+ LOG(WARNING) << "dm-verity not enabled; marking without verification.";
skip_verification = true;
-#else
- LOG(ERROR) << "Failed to get dm-verity mode.";
- return reboot_device();
-#endif
} else if (android::base::EqualsIgnoreCase(verity_mode, "eio")) {
// We shouldn't see verity in EIO mode if the current slot hasn't booted successfully before.
// Continue the verification until we fail to read some blocks.
@@ -285,7 +279,7 @@
LOG(WARNING) << "dm-verity in disabled mode; marking without verification.";
skip_verification = true;
} else if (verity_mode != "enforcing") {
- LOG(ERROR) << "Unexpected dm-verity mode : " << verity_mode << ", expecting enforcing.";
+ LOG(ERROR) << "Unexpected dm-verity mode: " << verity_mode << ", expecting enforcing.";
return reboot_device();
}
@@ -296,9 +290,6 @@
return reboot_device();
}
}
-#else
- LOG(WARNING) << "dm-verity not enabled; marking without verification.";
-#endif
CommandResult cr;
module->markBootSuccessful([&cr](CommandResult result) { cr = result; });