linux-kernel - RE: [PATCH v2 2/8] ima: Switch to ima_hash

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Date:   Thu, 6 Feb 2020 12:28:18 +0000
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        "James.Bottomley@...senPartnership.com" 
        <James.Bottomley@...senPartnership.com>,
        "jarkko.sakkinen@...ux.intel.com" <jarkko.sakkinen@...ux.intel.com>
CC:     "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Silviu Vlasceanu <Silviu.Vlasceanu@...wei.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH v2 2/8] ima: Switch to ima_hash_algo for boot aggregate

> -----Original Message-----
> From: Mimi Zohar [mailto:zohar@...ux.ibm.com]
> Sent: Thursday, February 6, 2020 1:17 PM
> To: Roberto Sassu <roberto.sassu@...wei.com>;
> James.Bottomley@...senPartnership.com;
> jarkko.sakkinen@...ux.intel.com
> Cc: linux-integrity@...r.kernel.org; linux-security-module@...r.kernel.org;
> linux-kernel@...r.kernel.org; Silviu Vlasceanu
> <Silviu.Vlasceanu@...wei.com>; stable@...r.kernel.org
> Subject: Re: [PATCH v2 2/8] ima: Switch to ima_hash_algo for boot
> aggregate
> 
> On Thu, 2020-02-06 at 09:36 +0000, Roberto Sassu wrote:
> > > Hi Roberto,
> > >
> > > On Wed, 2020-02-05 at 11:33 +0100, Roberto Sassu wrote:
> > >
> > > <snip>
> > >
> > > > Reported-by: Jerry Snitselaar <jsnitsel@...hat.com>
> > > > Suggested-by: James Bottomley
> > > <James.Bottomley@...senPartnership.com>
> > > > Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> > > > Cc: stable@...r.kernel.org
> > >
> > > Cc'ing stable resulted in Sasha's automated message.  If you're going
> > > to Cc stable, then please include the stable kernel release (e.g. Cc:
> > > stable@...r.kernel.org # v5.3).  Also please include a "Fixes" tag.
> > >  Normally only bug fixes are backported.
> >
> > Ok, will add the kernel version. I also thought which commit I should
> > mention in the Fixes tag. IMA always read the SHA1 bank from the
> > beginning. I could mention the patch that introduces the new API
> > to read other banks, but I'm not sure. What do you think?
> 
> This patch is dependent on nr_allocated_banks.  Please try applying
> this patch to the earliest stable kernel with the commit that
> introduces nr_allocated_banks and test to make sure it works properly.

It also depends on 879b589210a9 ("tpm: retrieve digest size of unknown"
algorithms with PCR read") which exported the mapping between TPM
algorithm ID and crypto ID, and changed the definition of tpm_pcr_read()
to read non-SHA1 PCR banks. It requires many patches, so backporting it
is not a trivial task. I think the earliest kernel this patch can be backported to
is 5.1.

Roberto