linux-kernel - Re: [PATCH v4 1/2] tpm: add ptr to the tpm_space struct to file

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 10 Aug 2018 11:05:17 -0700
From:   Tadeusz Struk <tadeusz.struk@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     flihp@...bit.us, jgg@...pe.ca, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] tpm: add ptr to the tpm_space struct to file_priv

On 08/10/2018 10:27 AM, Jarkko Sakkinen wrote:
> On Tue, Aug 07, 2018 at 01:27:44PM -0700, Tadeusz Struk wrote:
>> Add a ptr to struct tpm_space to the file_priv to have an easy
>> access to it in the async job without the need to allocate memory.
>> This also allows to consolidate of the write operations for
>> the two interfaces.
> 
> I think the 2nd premise should be the priority and the first premise should
> be removed as it is not needed in any possible way to justify the
> change.

Jarkko,
The main reason why the pointer to tpm_space struct was added to the
file_priv was to have access to space in the async job when it is enqueued
via the /dev/tpm<N> interface. Currently it is only available in tpmrm_priv.
Otherwise I would need to introduce yet another struct what would consist of
a ptr file_priv and a ptr to tpm_space and allocate it on every enqueue.
Much easier was to to it this way. The consolidation was only a side effect
of this so I think the description is correct.
Thanks,
-- 
Tadeusz