RE: One question about trusted key of keyring in Linux kernel.

[Zhao, Shirley]

Oh, get you, James. 
Understand, thanks for your feedback. 
Looking forward for your proposed API. 

- Shirley 

-----Original Message-----
From: James Bottomley <jejb@xxxxxxxxxxxxx> 
Sent: Wednesday, December 4, 2019 11:33 AM
To: Zhao, Shirley <shirley.zhao@xxxxxxxxx>; Mimi Zohar <zohar@xxxxxxxxxxxxx>; Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>; Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-integrity@xxxxxxxxxxxxxxx; keyrings@xxxxxxxxxxxxxxx; linux-doc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; 'Mauro Carvalho Chehab' <mchehab+samsung@xxxxxxxxxx>; Zhu, Bing <bing.zhu@xxxxxxxxx>; Chen, Luhai <luhai.chen@xxxxxxxxx>
Subject: Re: One question about trusted key of keyring in Linux kernel.

On Wed, 2019-12-04 at 03:01 +0000, Zhao, Shirley wrote:
> Hi, James,
> 
> Using policy digest to reload trusted key, doesn't work, either. 
> Please check the steps below. 
> I think policy digest should be calculated by TPM when verifying the 
> policy to reload key.

You misunderstand my meaning: the API we have now doesn't work; the key blob the kernel returns currently after key create won't reload because it contains extraneous data.  I was proposing a working API I thought might replace it, but obviously it has to be coded up and accepted into a kernel version before you can use it.

If you want to get trusted keys working today, I think the TPM 1.2 API still works if you have a TPM 1.2 system.

James