Re: [PATCH 7/8] ima: use ima_hash_algo for collision detection in the measurement list

Mimi Zohar
2020-01-31T14:22:15Z

On Fri, 2020-01-31 at 14:02 +0000, Roberto Sassu wrote:
> > -----Original Message-----
> > From: linux-integrity-owner@vger.kernel.org [mailto:linux-integrity-
> > owner@vger.kernel.org] On Behalf Of Mimi Zohar
> > Sent: Thursday, January 30, 2020 11:26 PM
> > To: Roberto Sassu <roberto.sassu@huawei.com>;
> > jarkko.sakkinen@linux.intel.com;
> > james.bottomley@hansenpartnership.com; linux-integrity@vger.kernel.org
> > Cc: linux-security-module@vger.kernel.org; linux-kernel@vger.kernel.org;
> > Silviu Vlasceanu <Silviu.Vlasceanu@huawei.com>
> > Subject: Re: [PATCH 7/8] ima: use ima_hash_algo for collision detection in
> > the measurement list
> >
> > On Mon, 2020-01-27 at 18:04 +0100, Roberto Sassu wrote:
> > > Before calculating a digest for each PCR bank, collisions were detected
> > > with a SHA1 digest. This patch includes ima_hash_algo among the
> > algorithms
> > > used to calculate the template digest and checks collisions on that digest.
> > >
> > > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> >
> > Definitely needed to protect against a sha1 collision attack.
> >
> > <snip>
> >
> > >
> > > diff --git a/security/integrity/ima/ima_api.c
> > b/security/integrity/ima/ima_api.c
> > > index ebaf0056735c..a9bb45de6db9 100644
> > > --- a/security/integrity/ima/ima_api.c
> > > +++ b/security/integrity/ima/ima_api.c
> > > @@ -51,7 +51,7 @@ int ima_alloc_init_template(struct ima_event_data
> > *event_data,
> > > if (!*entry)
> > > return -ENOMEM;
> > >
> > > - (*entry)->digests = kcalloc(ima_tpm_chip->nr_allocated_banks + 1,
> > > + (*entry)->digests = kcalloc(ima_tpm_chip->nr_allocated_banks + 2,
> > > sizeof(*(*entry)->digests), GFP_NOFS);
> > > if (!(*entry)->digests) {
> > > result = -ENOMEM;
> >
> > I would prefer not having to allocate and use "nr_allocated_banks + 1"
> > everywhere, but I understand the need for it.  I'm not sure this patch
> > warrants allocating +2.  Perhaps, if a TPM bank doesn't exist for the
> > IMA default hash algorithm, use a different algorithm or, worst case,
> > continue using the ima_sha1_idx.
>
> We could introduce a new option called ima_hash_algo_tpm to specify
> the algorithm of an allocated bank. We can use this for boot_aggregate
> and hash collision detection.

I don't think that would work in the case where the IMA default hash
is set to sha256, but the system has a TPM 1.2 chip.  We would be left
using SHA1 for the file hash collision detection.

With my suggestion of defining an "extra" variable, I kind of back
tracked here.  There are two problems that I'm trying to address -
hard coding the number of additional "banks" and unnecessarily
allocating more memory than necessary.  By pre-walking the list,
calculating the "extra" banks, you'll resolve both issues.

Mimi