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 1fLo8w-0004tF-Js for kexec@lists.infradead.org; Thu, 24 May 2018 11:10:58 +0000 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4OAxkR8092628 for ; Thu, 24 May 2018 07:10:39 -0400 Received: from e06smtp12.uk.ibm.com (e06smtp12.uk.ibm.com [195.75.94.108]) by mx0b-001b2d01.pphosted.com with ESMTP id 2j5tyckte0-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 24 May 2018 07:10:39 -0400 Received: from localhost by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 24 May 2018 12:10:37 +0100 From: Mimi Zohar Subject: [PATCH v3 4/7] firmware: add call to LSM hook before firmware sysfs fallback Date: Thu, 24 May 2018 07:09:33 -0400 In-Reply-To: <1527160176-29269-1-git-send-email-zohar@linux.vnet.ibm.com> References: <1527160176-29269-1-git-send-email-zohar@linux.vnet.ibm.com> Message-Id: <1527160176-29269-5-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 , Kees Cook , Ard Biesheuvel , Greg Kroah-Hartman , "Luis R . Rodriguez" , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, David Howells , 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 Cc: Luis R. Rodriguez Cc: David Howells Cc: Kees Cook Changelog: - 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 +++++++ include/linux/fs.h | 1 + 2 files changed, 8 insertions(+) diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c index 358354148dec..ae102efcc9f0 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(unsigned int opt_flags) static bool fw_run_sysfs_fallback(unsigned int 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(unsigned int opt_flags) if ((opt_flags & FW_OPT_NOFALLBACK)) return false; + /* Also permit LSMs and IMA to fail firmware sysfs fallback */ + ret = security_kernel_read_data(NULL, READING_FIRMWARE_FALLBACK_SYSFS); + if (ret < 0) + return ret; + return fw_force_sysfs_fallback(opt_flags); } diff --git a/include/linux/fs.h b/include/linux/fs.h index 760d8da1b6c7..6e31d9207435 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2810,6 +2810,7 @@ extern int do_pipe_flags(int *, int); id(UNKNOWN, unknown) \ id(FIRMWARE, firmware) \ id(FIRMWARE_PREALLOC_BUFFER, firmware) \ + id(FIRMWARE_FALLBACK_SYSFS, firmware) \ id(MODULE, kernel-module) \ id(KEXEC_IMAGE, kexec-image) \ id(KEXEC_INITRAMFS, kexec-initramfs) \ -- 2.7.5 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec