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 1fe2Sg-0000vT-Ty for kexec@lists.infradead.org; Fri, 13 Jul 2018 18:06:38 +0000 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w6DI4LK0114422 for ; Fri, 13 Jul 2018 14:06:29 -0400 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 2k6xv1njt9-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 13 Jul 2018 14:06:28 -0400 Received: from localhost by e06smtp03.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 13 Jul 2018 19:06:27 +0100 From: Mimi Zohar Subject: [PATCH v6 4/8] firmware: add call to LSM hook before firmware sysfs fallback Date: Fri, 13 Jul 2018 14:05:59 -0400 In-Reply-To: <1531505163-20227-1-git-send-email-zohar@linux.vnet.ibm.com> References: <1531505163-20227-1-git-send-email-zohar@linux.vnet.ibm.com> Message-Id: <1531505163-20227-5-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 , Greg Kroah-Hartman , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, Eric Biederman , Mimi Zohar , "Luis R . Rodriguez" Add an LSM hook prior to allowing firmware sysfs fallback loading. Signed-off-by: Mimi Zohar Acked-by: Luis R. Rodriguez --- Changelog v4: - call new LSM security_kernel_load_data hook Changelog v2: - call security_kernel_read_blob() - rename the READING_FIRMWARE_FALLBACK kernel_read_file_id enumeration to READING_FIRMWARE_FALLBACK_SYSFS. drivers/base/firmware_loader/fallback.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c index 7f732744f0d3..202324291542 100644 --- a/drivers/base/firmware_loader/fallback.c +++ b/drivers/base/firmware_loader/fallback.c @@ -651,6 +651,8 @@ static bool fw_force_sysfs_fallback(enum fw_opt opt_flags) static bool fw_run_sysfs_fallback(enum fw_opt opt_flags) { + int ret; + if (fw_fallback_config.ignore_sysfs_fallback) { pr_info_once("Ignoring firmware sysfs fallback due to sysctl knob\n"); return false; @@ -659,6 +661,11 @@ static bool fw_run_sysfs_fallback(enum fw_opt opt_flags) if ((opt_flags & FW_OPT_NOFALLBACK)) return false; + /* Also permit LSMs and IMA to fail firmware sysfs fallback */ + ret = security_kernel_load_data(LOADING_FIRMWARE); + if (ret < 0) + return ret; + return fw_force_sysfs_fallback(opt_flags); } -- 2.7.5 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec