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 1fZzz0-0002nM-A6 for kexec@lists.infradead.org; Mon, 02 Jul 2018 14:39:21 +0000 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w62EcaPb118179 for ; Mon, 2 Jul 2018 10:39:03 -0400 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0a-001b2d01.pphosted.com with ESMTP id 2jyk6eqmw3-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 02 Jul 2018 10:39:03 -0400 Received: from localhost by e06smtp03.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 2 Jul 2018 15:39:01 +0100 From: Mimi Zohar Subject: [PATCH v5 5/8] ima: based on policy require signed firmware (sysfs fallback) Date: Mon, 2 Jul 2018 10:38:00 -0400 In-Reply-To: <1530542283-26145-1-git-send-email-zohar@linux.vnet.ibm.com> References: <1530542283-26145-1-git-send-email-zohar@linux.vnet.ibm.com> Message-Id: <1530542283-26145-6-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, 9 insertions(+), 1 deletion(-) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 71fecfef0939..e467664965e7 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -472,8 +472,10 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size, if (!file && read_id == READING_FIRMWARE) { if ((ima_appraise & IMA_APPRAISE_FIRMWARE) && - (ima_appraise & IMA_APPRAISE_ENFORCE)) + (ima_appraise & IMA_APPRAISE_ENFORCE)) { + pr_err("Prevent firmware loading_store.\n"); return -EACCES; /* INTEGRITY_UNKNOWN */ + } return 0; } @@ -517,6 +519,12 @@ int ima_load_data(enum kernel_load_data_id id) pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file_load syscall.\n"); return -EACCES; /* INTEGRITY_UNKNOWN */ } + break; + case LOADING_FIRMWARE: + if (ima_appraise & IMA_APPRAISE_FIRMWARE) { + pr_err("Prevent firmware sysfs fallback loading.\n"); + return -EACCES; /* INTEGRITY_UNKNOWN */ + } default: break; } -- 2.7.5 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec