linux-kernel - Re: [PATCH RESEND] docs: update trusted-encrypted.rst

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Date:   Mon, 17 Aug 2020 01:01:38 +0800
From:   Coly Li <colyli@...e.de>
To:     Stefan Berger <stefanb@...ux.ibm.com>
Cc:     keyrings@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dan Williams <dan.j.williams@...el.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: Re: [PATCH RESEND] docs: update trusted-encrypted.rst

On 2020/8/17 00:06, Stefan Berger wrote:
> On 8/15/20 3:51 AM, Coly Li wrote:
>> The parameters in tmp2 commands are outdated, people are not able to
>> create trusted key by the example commands.
>>
>> This patch updates the paramerters of tpm2 commands, they are verified
>> by tpm2-tools-4.1 with Linux v5.8 kernel.
>>
>> Signed-off-by: Coly Li <colyli@...e.de>
>> Cc: Dan Williams <dan.j.williams@...el.com>
>> Cc: James Bottomley <jejb@...ux.ibm.com>
>> Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>> Cc: Mimi Zohar <zohar@...ux.ibm.com>
>> Cc: Stefan Berger <stefanb@...ux.ibm.com>
>> ---
>>   Documentation/security/keys/trusted-encrypted.rst | 9 ++++-----
>>   1 file changed, 4 insertions(+), 5 deletions(-)
>>
>> diff --git a/Documentation/security/keys/trusted-encrypted.rst
>> b/Documentation/security/keys/trusted-encrypted.rst
>> index 9483a7425ad5..442a2775156e 100644
>> --- a/Documentation/security/keys/trusted-encrypted.rst
>> +++ b/Documentation/security/keys/trusted-encrypted.rst
>> @@ -39,10 +39,9 @@ With the IBM TSS 2 stack::
>>     Or with the Intel TSS 2 stack::
>>   -  #> tpm2_createprimary --hierarchy o -G rsa2048 -o key.ctxt
>> +  #> tpm2_createprimary --hierarchy o -G rsa2048 key.ctxt
>>     [...]
>> -  handle: 0x800000FF
> 
> 
> Are you sure about this? My documentation for 4.1.3 on F32 states
> 
> 
> -c, --key-context=FILE:
> 
>          The file path to save the object context of the generated
> primary object.
> 
> 

Yes of course you are right, it is s/-o/-c

> 
>> -  #> tpm2_evictcontrol -c key.ctxt -p 0x81000001
>> +  #> tpm2_evictcontrol -c key.ctxt 0x81000001
>>     persistentHandle: 0x81000001
> 
> 
> This seems correct.
> 
> 
>>     Usage::
>> @@ -115,7 +114,7 @@ append 'keyhandle=0x81000001' to statements
>> between quotes, such as
> 
> 
> A note in this file states this:
> 
> Note: When using a TPM 2.0 with a persistent key with handle 0x81000001,
> append 'keyhandle=0x81000001' to statements between quotes, such as
> "new 32 keyhandle=0x81000001".
> 
> Now if someone was (still) interested in TPM 1.2 then the below changes
> you are proposing wouldn't work for them. Maybe you should adapt the
> note to state that these keyhandle=... should be removed for the TPM 1.2
> case.
> 

I agree. Indeed I have no idea why number 0x81000001 is used, and I
don't have practice experience with TPM 1.2. Now the purpose of this
patch accomplished: experts response and confirm my guess :-)

Thanks.

>>     ::
>>   -    $ keyctl add trusted kmk "new 32" @u
>> +    $ keyctl add trusted kmk "new 32 keyhandle=0x81000001" @u
>>       440502848
>>         $ keyctl show
>> @@ -138,7 +137,7 @@ append 'keyhandle=0x81000001' to statements
>> between quotes, such as
>>     Load a trusted key from the saved blob::
>>   -    $ keyctl add trusted kmk "load `cat kmk.blob`" @u
>> +    $ keyctl add trusted kmk "load `cat kmk.blob`
>> keyhandle=0x81000001" @u
>>       268728824
>>         $ keyctl print 268728824
> 
> 

Coly Li