linux-kernel - Re: [PATCH V8 2/3] Define a new ima template field buf

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Date:   Fri, 14 Jun 2019 05:15:44 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     Prakhar Srivastava <prsriva02@...il.com>
cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, zohar@...ux.ibm.com,
        roberto.sassu@...wei.com, vgoyal@...hat.com
Subject: Re: [PATCH V8 2/3] Define a new ima template field buf

On Wed, 12 Jun 2019, Prakhar Srivastava wrote:

> A buffer(kexec cmdline args) measured into ima cannot be
> appraised without already being aware of the buffer contents.
> Since hashes are non-reversible, raw buffer is needed for
> validation or regenerating hash for appraisal/attestation.
> 
> This patch adds support to ima to allow store/read the
> buffer contents in HEX.
> 
> - Add two new fields to ima_event_data to hold the buf and
> buf_len [Suggested by Roberto]
> - Add a new temaplte field 'buf' to be used to store/read
> the buffer data.[Suggested by Mimi]
> - Updated process_buffer_meaurement to add the buffer to
> ima_event_data. process_buffer_measurement added in
> "Define a new IMA hook to measure the boot command line
>  arguments"
> - Add a new template policy name ima-buf to represent
> 'd-ng|n-ng|buf'
> 
> Signed-off-by: Prakhar Srivastava <prsriva02@...il.com>
> Reviewed-by: Roberto Sassu <roberto.sassu@...wei.com>


Reviewed-by: James Morris <jamorris@...ux.microsoft.com>


-- 
James Morris
<jmorris@...ei.org>