【开机重启问题】Android P 绕过dm-verity检测

在update_verifier里绕过dm-verity检测

//bootable/recovery/update_verifier/update_verifier.cpp
//int update_verifier(int argc, char** argv) {

...

#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.
      LOG(WARNING) << "Found dm-verity in EIO mode.";
    } else if (android::base::EqualsIgnoreCase(verity_mode, "disabled")) {
      LOG(WARNING) << "dm-verity in disabled mode; marking without verification.";
      skip_verification = true;
+    } else if (verity_mode == "logging") {
+      LOG(ERROR) << "Ethan skip here, dm-verity mode : " << verity_mode << ", expecting work around.";
+      skip_verification = true;    
    } else if (verity_mode != "enforcing") {
      LOG(ERROR) << "Unexpected dm-verity mode : " << verity_mode << ", expecting enforcing.";
      return reboot_device();

参考文档：

https://source.android.google.cn/devices/tech/ota/ab/

https://source.android.google.cn/security/verifiedboot/dm-verity.html

https://blog.youkuaiyun.com/u012932409/article/details/102466579