Merge "Add a switch to enforce avb for DSU in userdebug"
diff --git a/fs_mgr/libfs_avb/Android.bp b/fs_mgr/libfs_avb/Android.bp
index bf51fe7..8fb9697 100644
--- a/fs_mgr/libfs_avb/Android.bp
+++ b/fs_mgr/libfs_avb/Android.bp
@@ -31,6 +31,7 @@
static_libs: [
"libavb",
"libdm",
+ "libgsi",
"libfstab",
],
export_static_lib_headers: [
diff --git a/fs_mgr/libfs_avb/fs_avb.cpp b/fs_mgr/libfs_avb/fs_avb.cpp
index ed623bc..5d504ab 100644
--- a/fs_mgr/libfs_avb/fs_avb.cpp
+++ b/fs_mgr/libfs_avb/fs_avb.cpp
@@ -33,6 +33,7 @@
#include <android-base/strings.h>
#include <libavb/libavb.h>
#include <libdm/dm.h>
+#include <libgsi/libgsi.h>
#include "avb_ops.h"
#include "avb_util.h"
@@ -266,6 +267,18 @@
return avb_handle;
}
+static bool IsAvbPermissive() {
+ if (IsDeviceUnlocked()) {
+ // Manually putting a file under metadata partition can enforce AVB verification.
+ if (!access(DSU_METADATA_PREFIX "avb_enforce", F_OK)) {
+ LINFO << "Enforcing AVB verification when the device is unlocked";
+ return false;
+ }
+ return true;
+ }
+ return false;
+}
+
AvbUniquePtr AvbHandle::LoadAndVerifyVbmeta(const FstabEntry& fstab_entry,
const std::vector<std::string>& preload_avb_key_blobs) {
// At least one of the following should be provided for public key matching.
@@ -275,7 +288,7 @@
}
// Binds allow_verification_error and rollback_protection to device unlock state.
- bool allow_verification_error = IsDeviceUnlocked();
+ bool allow_verification_error = IsAvbPermissive();
bool rollback_protection = !allow_verification_error;
std::string public_key_data;
@@ -364,15 +377,15 @@
return LoadAndVerifyVbmeta("vbmeta", fs_mgr_get_slot_suffix(), fs_mgr_get_other_slot_suffix(),
{} /* expected_public_key, already checked by bootloader */,
HashAlgorithm::kSHA256,
- IsDeviceUnlocked(), /* allow_verification_error */
- true, /* load_chained_vbmeta */
+ IsAvbPermissive(), /* allow_verification_error */
+ true, /* load_chained_vbmeta */
false, /* rollback_protection, already checked by bootloader */
nullptr /* custom_device_path */);
}
// TODO(b/128807537): removes this function.
AvbUniquePtr AvbHandle::Open() {
- bool is_device_unlocked = IsDeviceUnlocked();
+ bool allow_verification_error = IsAvbPermissive();
AvbUniquePtr avb_handle(new AvbHandle());
if (!avb_handle) {
@@ -381,8 +394,9 @@
}
FsManagerAvbOps avb_ops;
- AvbSlotVerifyFlags flags = is_device_unlocked ? AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR
- : AVB_SLOT_VERIFY_FLAGS_NONE;
+ AvbSlotVerifyFlags flags = allow_verification_error
+ ? AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR
+ : AVB_SLOT_VERIFY_FLAGS_NONE;
AvbSlotVerifyResult verify_result =
avb_ops.AvbSlotVerify(fs_mgr_get_slot_suffix(), flags, &avb_handle->vbmeta_images_);
@@ -405,9 +419,8 @@
break;
case AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION:
case AVB_SLOT_VERIFY_RESULT_ERROR_PUBLIC_KEY_REJECTED:
- if (!is_device_unlocked) {
- LERROR << "ERROR_VERIFICATION / PUBLIC_KEY_REJECTED isn't allowed "
- << "if the device is LOCKED";
+ if (!allow_verification_error) {
+ LERROR << "ERROR_VERIFICATION / PUBLIC_KEY_REJECTED isn't allowed ";
return nullptr;
}
avb_handle->status_ = AvbHandleStatus::kVerificationError;