Re: [PATCH 1/6] tpm: implement TPM2 function to get update counter

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On Thu Aug 3, 2023 at 4:22 AM EEST, Mimi Zohar wrote:
> On Wed, 2023-08-02 at 06:58 +0300, Jarkko Sakkinen wrote:
> > 
> > From long description I see zero motivation to ack this change, except
> > some heresay about IMA requiring it. Why does IMA need update_cnt and
> > why this is not documented to the long description?
>
> The motivation is to detect whether the IMA measurement list has been
> truncated, for whatever reason.  A new IMA record should be defined
> containing the "pcrCounter" value.  (I have not had a chance to review
> this patch set.)
>
> This new record would be a pre-req for both Tushar's "ima: measure
> events between kexec load and execute" patch set and Sush's proposal to
> trim the measurement list.  (I haven't looked at it yet either.)

Please describe the story in a bit more understandable form. In the
commit messages it is not good to have some redundancy in patch sets.

BR, Jarkko

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