From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fGwzi-0006Ke-16 for kexec@lists.infradead.org; Fri, 11 May 2018 01:37:15 +0000 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4B1Yrsx063292 for ; Thu, 10 May 2018 21:37:08 -0400 Received: from e06smtp10.uk.ibm.com (e06smtp10.uk.ibm.com [195.75.94.106]) by mx0a-001b2d01.pphosted.com with ESMTP id 2hvvftb2f7-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 10 May 2018 21:37:08 -0400 Received: from localhost by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 11 May 2018 02:37:06 +0100 From: Mimi Zohar Subject: [PATCH 3/3] ima: based on policy require signed kexec kernel images Date: Thu, 10 May 2018 21:36:48 -0400 In-Reply-To: <1526002608-27474-1-git-send-email-zohar@linux.vnet.ibm.com> References: <1526002608-27474-1-git-send-email-zohar@linux.vnet.ibm.com> Message-Id: <1526002608-27474-4-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: Kees Cook , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Matthew Garrett , David Howells , linux-security-module@vger.kernel.org, Eric Biederman , Mimi Zohar The original kexec_load syscall can not verify file signatures. This patch differentiates between the kexec_load and kexec_file_load syscalls. Signed-off-by: Mimi Zohar Cc: Eric Biederman Cc: David Howells Cc: Kees Cook Cc: Matthew Garrett --- security/integrity/ima/ima.h | 1 + security/integrity/ima/ima_main.c | 9 +++++++++ security/integrity/ima/ima_policy.c | 2 ++ 3 files changed, 12 insertions(+) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 35fe91aa1fc9..03c9c37ee345 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -233,6 +233,7 @@ int ima_policy_show(struct seq_file *m, void *v); #define IMA_APPRAISE_MODULES 0x08 #define IMA_APPRAISE_FIRMWARE 0x10 #define IMA_APPRAISE_POLICY 0x20 +#define IMA_APPRAISE_KEXEC 0x40 #ifdef CONFIG_IMA_APPRAISE int ima_appraise_measurement(enum ima_hooks func, diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 74d0bd7e76d7..754ece08e1c6 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -444,6 +444,15 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) } return 0; /* We rely on module signature checking */ } + + if (!file && read_id == READING_KEXEC_IMAGE) { + if ((ima_appraise & IMA_APPRAISE_KEXEC) && + (ima_appraise & IMA_APPRAISE_ENFORCE)) { + pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file syscall.\n"); + return -EACCES; /* INTEGRITY_UNKNOWN */ + } + return 0; + } return 0; } diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index df3e45878a87..a9e96a884867 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -448,6 +448,8 @@ static int ima_appraise_flag(enum ima_hooks func) return IMA_APPRAISE_FIRMWARE; else if (func == POLICY_CHECK) return IMA_APPRAISE_POLICY; + else if (func == KEXEC_KERNEL_CHECK) + return IMA_APPRAISE_KEXEC; return 0; } -- 2.7.5 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec