From patchwork Wed Jul 15 15:48:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lakshmi Ramasubramanian X-Patchwork-Id: 11665831 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 02EA917C5 for ; Wed, 15 Jul 2020 15:49:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DFC5B20663 for ; Wed, 15 Jul 2020 15:49:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="jM9NTkdT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727019AbgGOPtB (ORCPT ); Wed, 15 Jul 2020 11:49:01 -0400 Received: from linux.microsoft.com ([13.77.154.182]:45920 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725991AbgGOPtA (ORCPT ); Wed, 15 Jul 2020 11:49:00 -0400 Received: from localhost.localdomain (c-73-42-176-67.hsd1.wa.comcast.net [73.42.176.67]) by linux.microsoft.com (Postfix) with ESMTPSA id 5770B20B490C; Wed, 15 Jul 2020 08:48:59 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 5770B20B490C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1594828139; bh=OqDhaj3lxUF2+F+a7rlNEFcsWrZi5ztd9xoMLqCdtb8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jM9NTkdTyQWFznJayggIeGGBa+zjV22gF5o6/bmBhW6Xjdz7XTlh2LW0Cut7ZjrFS s+KqN47ZmWY0pRc9VM0DdsznCv7kIvB/hbQ8tLXXUtzsn//ab49ep97k1JLp7FlCnU a51dnyEOXhwWu+m5MdcCLmwZSCn9MmSmMuY7s+oM= From: Lakshmi Ramasubramanian To: zohar@linux.ibm.com, stephen.smalley.work@gmail.com, casey@schaufler-ca.com Cc: jmorris@namei.org, linux-integrity@vger.kernel.org, selinux@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 3/5] LSM: Add security_state function pointer in lsm_info struct Date: Wed, 15 Jul 2020 08:48:51 -0700 Message-Id: <20200715154853.23374-4-nramas@linux.microsoft.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200715154853.23374-1-nramas@linux.microsoft.com> References: <20200715154853.23374-1-nramas@linux.microsoft.com> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: The security modules that require their data to be measured using the IMA subsystem need to define a function that the LSM can call to trigger the measurement. Add a function pointer field namely security_state in lsm_info structure. Update LSM to call this security module function, if defined, to measure the security module's data using the IMA subsystem. Signed-off-by: Lakshmi Ramasubramanian --- include/linux/lsm_hooks.h | 3 +++ security/security.c | 48 ++++++++++++++++++++++++++++++++++++++- 2 files changed, 50 insertions(+), 1 deletion(-) diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index 95b7c1d32062..a688eb29e5d8 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -1591,6 +1591,9 @@ struct lsm_info { int *enabled; /* Optional: controlled by CONFIG_LSM */ int (*init)(void); /* Required. */ struct lsm_blob_sizes *blobs; /* Optional: for blob sharing. */ + int (*security_state)(void); /* Optional: for measuring the state + * of the security module. + */ }; extern struct lsm_info __start_lsm_info[], __end_lsm_info[]; diff --git a/security/security.c b/security/security.c index 70a7ad357bc6..3fbabc2e6ddb 100644 --- a/security/security.c +++ b/security/security.c @@ -86,6 +86,9 @@ static __initconst const char * const builtin_lsm_order = CONFIG_LSM; static __initdata struct lsm_info **ordered_lsms; static __initdata struct lsm_info *exclusive; +static struct lsm_info *security_state_lsms; +static int security_state_lsms_count; + static __initdata bool debug; #define init_debug(...) \ do { \ @@ -235,6 +238,45 @@ static void __init initialize_lsm(struct lsm_info *lsm) } } +static int measure_security_state(struct lsm_info *lsm) +{ + if (!lsm->security_state) + return 0; + + return lsm->security_state(); +} + +static void __init initialize_security_state_lsms(void) +{ + struct lsm_info **lsm; + int count = 0; + int inx; + + for (lsm = ordered_lsms; *lsm; lsm++) { + if ((*lsm)->security_state) + count++; + } + + if (count == 0) + return; + + security_state_lsms = kcalloc(count, sizeof(struct lsm_info), + GFP_KERNEL); + if (!security_state_lsms) + return; + + inx = 0; + for (lsm = ordered_lsms; *lsm; lsm++) { + if ((*lsm)->security_state) { + security_state_lsms[inx].security_state = + (*lsm)->security_state; + inx++; + } + } + + security_state_lsms_count = count; +} + /* Populate ordered LSMs list from comma-separated LSM name list. */ static void __init ordered_lsm_parse(const char *order, const char *origin) { @@ -352,8 +394,12 @@ static void __init ordered_lsm_init(void) lsm_early_cred((struct cred *) current->cred); lsm_early_task(current); - for (lsm = ordered_lsms; *lsm; lsm++) + for (lsm = ordered_lsms; *lsm; lsm++) { initialize_lsm(*lsm); + measure_security_state(*lsm); + } + + initialize_security_state_lsms(); kfree(ordered_lsms); }