Verify wipe package when wiping A/B device in recovery.
To increase the security of wiping A/B devices, let uncrypt write
wipe package in misc partition. Then recovery verifies the wipe
package before wiping the device.
Bug: 29159185
Change-Id: I186691bab1928d3dc036bc5542abd64a81bc2168
diff --git a/uncrypt/uncrypt.cpp b/uncrypt/uncrypt.cpp
index d7105a0..f62d132 100644
--- a/uncrypt/uncrypt.cpp
+++ b/uncrypt/uncrypt.cpp
@@ -503,14 +503,31 @@
return false;
}
ALOGI(" received command: [%s] (%zu)", content.c_str(), content.size());
+ std::vector<std::string> options = android::base::Split(content, "\n");
+ std::string wipe_package;
+ for (auto& option : options) {
+ if (android::base::StartsWith(option, "--wipe_package=")) {
+ std::string path = option.substr(strlen("--wipe_package="));
+ if (!android::base::ReadFileToString(path, &wipe_package)) {
+ ALOGE("failed to read %s: %s", path.c_str(), strerror(errno));
+ return false;
+ }
+ option = android::base::StringPrintf("--wipe_package_size=%zu", wipe_package.size());
+ }
+ }
// c8. setup the bcb command
std::string err;
- if (!write_bootloader_message({content}, &err)) {
+ if (!write_bootloader_message(options, &err)) {
ALOGE("failed to set bootloader message: %s", err.c_str());
write_status_to_socket(-1, socket);
return false;
}
+ if (!wipe_package.empty() && !write_wipe_package(wipe_package, &err)) {
+ ALOGE("failed to set wipe package: %s", err.c_str());
+ write_status_to_socket(-1, socket);
+ return false;
+ }
// c10. send "100" status
write_status_to_socket(100, socket);
return true;