From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5] helo=mx0a-001b2d01.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fJKEB-0001pS-Ez for kexec@lists.infradead.org; Thu, 17 May 2018 14:50:13 +0000 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4HEiufV041161 for ; Thu, 17 May 2018 10:49:55 -0400 Received: from e06smtp12.uk.ibm.com (e06smtp12.uk.ibm.com [195.75.94.108]) by mx0b-001b2d01.pphosted.com with ESMTP id 2j1avckatt-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 17 May 2018 10:49:54 -0400 Received: from localhost by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 17 May 2018 15:49:52 +0100 From: Mimi Zohar Subject: [PATCH v2 7/9] ima: based on policy require signed firmware (sysfs fallback) Date: Thu, 17 May 2018 10:48:48 -0400 In-Reply-To: <1526568530-9144-1-git-send-email-zohar@linux.vnet.ibm.com> References: <1526568530-9144-1-git-send-email-zohar@linux.vnet.ibm.com> Message-Id: <1526568530-9144-8-git-send-email-zohar@linux.vnet.ibm.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: linux-integrity@vger.kernel.org Cc: Andres Rodriguez , Ard Biesheuvel , Greg Kroah-Hartman , "Luis R . Rodriguez" , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Matthew Garrett , David Howells , linux-security-module@vger.kernel.org, Eric Biederman , Mimi Zohar , "Luis R . Rodriguez" With an IMA policy requiring signed firmware, this patch prevents the sysfs fallback method of loading firmware. Signed-off-by: Mimi Zohar Cc: Luis R. Rodriguez Cc: David Howells Cc: Matthew Garrett --- security/integrity/ima/ima_main.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 7e1a127f18fe..29d1a929af5c 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -451,7 +451,17 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) } return 0; } + + if (read_id == READING_FIRMWARE_FALLBACK_SYSFS) { + if ((ima_appraise & IMA_APPRAISE_FIRMWARE) && + (ima_appraise & IMA_APPRAISE_ENFORCE)) { + pr_err("Prevent firmware sysfs fallback loading.\n"); + return -EACCES; + } + return 0; + } return 0; + } static int read_idmap[READING_MAX_ID] = { -- 2.7.5 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec