linux-kernel - Re: [PATCH v9 5/8] ima: make process_buffer

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Date:   Wed, 30 Oct 2019 12:35:52 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        Nayna Jain <nayna@...ux.ibm.com>, linuxppc-dev@...abs.org,
        linux-efi@...r.kernel.org, linux-integrity@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Jeremy Kerr <jk@...abs.org>,
        Matthew Garret <matthew.garret@...ula.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Claudio Carvalho <cclaudio@...ux.ibm.com>,
        George Wilson <gcwilson@...ux.ibm.com>,
        Elaine Palmer <erpalmer@...ibm.com>,
        Eric Ricther <erichte@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Prakhar Srivastava <prsriva02@...il.com>
Subject: Re: [PATCH v9 5/8] ima: make process_buffer_measurement() generic

On Wed, 2019-10-30 at 08:22 -0700, Lakshmi Ramasubramanian wrote:
> On 10/23/19 8:47 PM, Nayna Jain wrote:
> 
> Hi Nayna,
> 
> > process_buffer_measurement() is limited to measuring the kexec boot
> > command line. This patch makes process_buffer_measurement() more
> > generic, allowing it to measure other types of buffer data (e.g.
> > blacklisted binary hashes or key hashes).
> 
> Now that process_buffer_measurement() is being made generic to measure 
> any buffer, it would be good to add a tag to indicate what type of 
> buffer is being measured.
> 
> For example, if the buffer is kexec command line the log could look like:
> 
>   "kexec_cmdline: <command line data>"
> 
> Similarly, if the buffer is blacklisted binary hash:
> 
>   "blacklist hash: <data>".
> 
> If the buffer is key hash:
> 
>   "<name of the keyring>: key data".
> 
> This would greatly help the consumer of the IMA log to know the type of 
> data represented in each IMA log entry.

Both the existing kexec command line and the new blacklist buffer
measurement pass that information in the eventname.   The [PATCH 7/8]
"ima: check against blacklisted hashes for files with modsig" patch
description includes an example.

Mimi