From: Thiago Jung Bauermann <bauerman@linux.ibm.com>
To: Mimi Zohar <zohar@linux.ibm.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
linux-doc@vger.kernel.org,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Jonathan Corbet <corbet@lwn.net>,
linux-kernel@vger.kernel.org, James Morris <jmorris@namei.org>,
David Howells <dhowells@redhat.com>,
"AKASHI, Takahiro" <takahiro.akashi@linaro.org>,
linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
linux-crypto@vger.kernel.org, Jessica Yu <jeyu@kernel.org>,
linux-integrity@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
David Woodhouse <dwmw2@infradead.org>,
"Serge E. Hallyn" <serge@hallyn.com>
Subject: Re: [PATCH v10 12/12] ima: Store the measurement again when appraising a modsig
Date: Tue, 28 May 2019 16:14:30 -0300 [thread overview]
Message-ID: <871s0i75nt.fsf@morokweng.localdomain> (raw)
In-Reply-To: <1559052560.4090.14.camel@linux.ibm.com>
Mimi Zohar <zohar@linux.ibm.com> writes:
> Hi Thiago,
>
> On Thu, 2019-04-18 at 00:51 -0300, Thiago Jung Bauermann wrote:
>> If the IMA template contains the "modsig" or "d-modsig" field, then the
>> modsig should be added to the measurement list when the file is appraised.
>>
>> And that is what normally happens, but if a measurement rule caused a file
>> containing a modsig to be measured before a different rule causes it to be
>> appraised, the resulting measurement entry will not contain the modsig
>> because it is only fetched during appraisal. When the appraisal rule
>> triggers, it won't store a new measurement containing the modsig because
>> the file was already measured.
>>
>> We need to detect that situation and store an additional measurement with
>> the modsig. This is done by adding an IMA_MEASURE action flag if we read a
>> modsig and the IMA template contains a modsig field.
>
> With the new per policy rule "template" support being added, this
> patch needs to be modified so that the per policy "template" format is
> checked. ima_template_has_modsig() should be called with the
> template_desc being used.
Right. Thanks for point out what needs to be done. After rebasing on top
of Matthew Garret's "IMA: Allow profiles to define the desired IMA
template" patch I changed ima_template_has_modsig() to check the
template_desc obtained from process_measurement().
--
Thiago Jung Bauermann
IBM Linux Technology Center
prev parent reply other threads:[~2019-05-28 19:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-18 3:51 [PATCH v10 00/12] Appended signatures support for IMA appraisal Thiago Jung Bauermann
2019-04-18 3:51 ` [PATCH v10 01/12] MODSIGN: Export module signature definitions Thiago Jung Bauermann
2019-05-09 15:42 ` Mimi Zohar
2019-05-28 19:03 ` Thiago Jung Bauermann
2019-04-18 3:51 ` [PATCH v10 02/12] PKCS#7: Refactor verify_pkcs7_signature() Thiago Jung Bauermann
2019-05-09 15:42 ` Mimi Zohar
2019-04-18 3:51 ` [PATCH v10 03/12] PKCS#7: Introduce pkcs7_get_digest() Thiago Jung Bauermann
2019-05-09 15:42 ` Mimi Zohar
2019-04-18 3:51 ` [PATCH v10 04/12] integrity: Introduce struct evm_xattr Thiago Jung Bauermann
2019-04-18 3:51 ` [PATCH v10 05/12] integrity: Select CONFIG_KEYS instead of depending on it Thiago Jung Bauermann
2019-04-18 3:51 ` [PATCH v10 06/12] ima: Use designated initializers for struct ima_event_data Thiago Jung Bauermann
2019-05-09 15:46 ` Mimi Zohar
2019-04-18 3:51 ` [PATCH v10 07/12] ima: Add modsig appraise_type option for module-style appended signatures Thiago Jung Bauermann
2019-04-18 3:51 ` [PATCH v10 08/12] ima: Factor xattr_verify() out of ima_appraise_measurement() Thiago Jung Bauermann
2019-05-09 15:53 ` Mimi Zohar
2019-04-18 3:51 ` [PATCH v10 09/12] ima: Implement support for module-style appended signatures Thiago Jung Bauermann
2019-05-09 23:01 ` Mimi Zohar
2019-05-28 19:23 ` Thiago Jung Bauermann
2019-05-28 20:06 ` Mimi Zohar
2019-05-14 12:09 ` Mimi Zohar
2019-05-28 19:27 ` Thiago Jung Bauermann
2019-04-18 3:51 ` [PATCH v10 10/12] ima: Collect modsig Thiago Jung Bauermann
2019-04-18 3:51 ` [PATCH v10 11/12] ima: Define ima-modsig template Thiago Jung Bauermann
2019-05-09 23:01 ` Mimi Zohar
2019-05-28 19:09 ` Thiago Jung Bauermann
2019-04-18 3:51 ` [PATCH v10 12/12] ima: Store the measurement again when appraising a modsig Thiago Jung Bauermann
2019-05-28 14:09 ` Mimi Zohar
2019-05-28 19:14 ` Thiago Jung Bauermann [this message]
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