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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 11 Oct 2019 14:14:06 +0100 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x9BDE4P757999396 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 11 Oct 2019 13:14:04 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4B3F442042; Fri, 11 Oct 2019 13:14:04 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3FE844203F; Fri, 11 Oct 2019 13:14:02 +0000 (GMT) Received: from localhost.localdomain (unknown [9.85.178.57]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 11 Oct 2019 13:14:02 +0000 (GMT) Subject: Re: [PATCH v7 5/8] ima: make process_buffer_measurement() generic From: Mimi Zohar To: Nayna Jain , linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Ard Biesheuvel , Jeremy Kerr , Matthew Garret , Greg Kroah-Hartman , Claudio Carvalho , George Wilson , Elaine Palmer , Eric Ricther , "Oliver O'Halloran" , Prakhar Srivastava Date: Fri, 11 Oct 2019 09:14:01 -0400 In-Reply-To: <1570497267-13672-6-git-send-email-nayna@linux.ibm.com> References: <1570497267-13672-1-git-send-email-nayna@linux.ibm.com> <1570497267-13672-6-git-send-email-nayna@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.20.5 (3.20.5-1.fc24) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19101113-4275-0000-0000-000003713179 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19101113-4276-0000-0000-000038843CBB Message-Id: <1570799641.5250.75.camel@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-10-11_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910110124 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [Cc'ing Prakhar Srivastava] On Mon, 2019-10-07 at 21:14 -0400, Nayna Jain wrote: > An additional measurement record is needed to indicate the blacklisted > binary. The record will measure the blacklisted binary hash. > > This patch makes the function process_buffer_measurement() generic to be > called by the blacklisting function. It modifies the function to handle > more than just the KEXEC_CMDLINE. The purpose of this patch is to make process_buffer_measurement() more generic.  The patch description should simply say, 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 (eg. blacklisted binary hashes). Mimi > > Signed-off-by: Nayna Jain > --- > security/integrity/ima/ima.h | 3 +++ > security/integrity/ima/ima_main.c | 29 ++++++++++++++--------------- > 2 files changed, 17 insertions(+), 15 deletions(-) > > diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h > index 3689081aaf38..ed86c1f70d7f 100644 > --- a/security/integrity/ima/ima.h > +++ b/security/integrity/ima/ima.h > @@ -217,6 +217,9 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, > struct evm_ima_xattr_data *xattr_value, > int xattr_len, const struct modsig *modsig, int pcr, > struct ima_template_desc *template_desc); > +void process_buffer_measurement(const void *buf, int size, > + const char *eventname, int pcr, > + struct ima_template_desc *template_desc); > void ima_audit_measurement(struct integrity_iint_cache *iint, > const unsigned char *filename); > int ima_alloc_init_template(struct ima_event_data *event_data, > diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c > index 60027c643ecd..77115e884496 100644 > --- a/security/integrity/ima/ima_main.c > +++ b/security/integrity/ima/ima_main.c > @@ -626,14 +626,14 @@ int ima_load_data(enum kernel_load_data_id id) > * @buf: pointer to the buffer that needs to be added to the log. > * @size: size of buffer(in bytes). > * @eventname: event name to be used for the buffer entry. > - * @cred: a pointer to a credentials structure for user validation. > - * @secid: the secid of the task to be validated. > + * @pcr: pcr to extend the measurement > + * @template_desc: template description > * > * Based on policy, the buffer is measured into the ima log. > */ > -static void process_buffer_measurement(const void *buf, int size, > - const char *eventname, > - const struct cred *cred, u32 secid) > +void process_buffer_measurement(const void *buf, int size, > + const char *eventname, int pcr, > + struct ima_template_desc *template_desc) > { > int ret = 0; > struct ima_template_entry *entry = NULL; > @@ -642,19 +642,11 @@ static void process_buffer_measurement(const void *buf, int size, > .filename = eventname, > .buf = buf, > .buf_len = size}; > - struct ima_template_desc *template_desc = NULL; > struct { > struct ima_digest_data hdr; > char digest[IMA_MAX_DIGEST_SIZE]; > } hash = {}; > int violation = 0; > - int pcr = CONFIG_IMA_MEASURE_PCR_IDX; > - int action = 0; > - > - action = ima_get_action(NULL, cred, secid, 0, KEXEC_CMDLINE, &pcr, > - &template_desc); > - if (!(action & IMA_MEASURE)) > - return; > > iint.ima_hash = &hash.hdr; > iint.ima_hash->algo = ima_hash_algo; > @@ -686,12 +678,19 @@ static void process_buffer_measurement(const void *buf, int size, > */ > void ima_kexec_cmdline(const void *buf, int size) > { > + int pcr = CONFIG_IMA_MEASURE_PCR_IDX; > + struct ima_template_desc *template_desc = NULL; > + int action; > u32 secid; > > if (buf && size != 0) { > security_task_getsecid(current, &secid); > - process_buffer_measurement(buf, size, "kexec-cmdline", > - current_cred(), secid); > + action = ima_get_action(NULL, current_cred(), secid, 0, > + KEXEC_CMDLINE, &pcr, &template_desc); > + if (!(action & IMA_MEASURE)) > + return; > + process_buffer_measurement(buf, size, "kexec-cmdline", pcr, > + template_desc); > } > } >