From patchwork Sat Apr 20 00:15:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prakhar Srivastava X-Patchwork-Id: 10909879 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0858613B5 for ; Sat, 20 Apr 2019 00:16:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EB21428CBB for ; Sat, 20 Apr 2019 00:16:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DFB0D28E14; Sat, 20 Apr 2019 00:16:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C419228CBB for ; Sat, 20 Apr 2019 00:16:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727357AbfDTAPw (ORCPT ); Fri, 19 Apr 2019 20:15:52 -0400 Received: from mail-pf1-f194.google.com ([209.85.210.194]:41281 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725858AbfDTAPv (ORCPT ); Fri, 19 Apr 2019 20:15:51 -0400 Received: by mail-pf1-f194.google.com with SMTP id 188so3153626pfd.8; Fri, 19 Apr 2019 17:15:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=eMFDUMGPg9svBemR3kNl+I7JDj7h3EAZp1KY9ojzIcE=; b=SCdyD0t8NDNzdihEGSsf3RbYesAe2cvCjKRDzLZ6UW1K5RtzF79MbDe2MLUIy8cb6l E8yyJ8jdY+UVOXHUZ2hpgKspfXuh9pYIhU3SAeC0y4JoPsUzZsQZtK7DksLqgX027LTm JUSSvDs63zk+d2Ckb804pXjs7NKaCYg6bwUyrJu0og1VtBd7iM9cRUY+iSDzDpXx91wh H9oHFzTDFulekT7YQQfolAHzilNitl3GaW0Da87rm3e/93iFkDrPfGUSd9UmcC2+EFVs 5cD7Ozg7ffHKPesRwOdlNhsh6vdv8peRlNwVeT/isklPUbpUvG2UAy6mVr66sKZ1BCJ1 L51g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=eMFDUMGPg9svBemR3kNl+I7JDj7h3EAZp1KY9ojzIcE=; b=c1dQwSo6X93aLR+X5JwvpTSFOrXwe/Fn3Fax7axuomGnHpT9ZUiTKeVfiPgfzHo9Zd de+vijzEorglyoTbLl30fs5bMtvRYMvBZcGAv2oqG7GIzNcWJySb3WnIfUTVBxJzTGwr z7DEOo4MtFvelUAihP3RuXhFdJoUk1VLXc18tqdYW5DLaFf2hCKRgNTXvnnbUDD2J/lX WFvrcVYAg5/1rxqavSHFeQFbkuR2OoTyUp5GcA7Ch3k0v6DLyciw4nUtcOUQ/zukkIYk ITz2n2Oxj+qScxtl2NqK9dVftcjtfRd5mysmn6JFKWj7G+RVGHJ8e06nVhbdfIorGJkK 78MQ== X-Gm-Message-State: APjAAAVdQjoaBwyEd8oN4KuBCGuuMgHEH89Bs1YRgFepL8ffAhLyS1n2 0jnOhoXk+pE+ydIE4yRqawMmWaNNjiA= X-Google-Smtp-Source: APXvYqywUZe67MMD7vU+EraF76aWxm0b0ZHyJFcqF1pio2hb63Lew//h5HGHhSc7MAvrgv2RC48DXA== X-Received: by 2002:a63:10c:: with SMTP id 12mr6846302pgb.276.1555719350968; Fri, 19 Apr 2019 17:15:50 -0700 (PDT) Received: from prsriva-linux.corp.microsoft.com ([2001:4898:80e8:2:5828:72bc:96ef:ce7c]) by smtp.gmail.com with ESMTPSA id a3sm8339902pfn.182.2019.04.19.17.15.49 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 19 Apr 2019 17:15:49 -0700 (PDT) From: Prakhar Srivastava X-Google-Original-From: Prakhar Srivastava To: linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org Cc: zohar@linux.vnet.ibm.com, ebiederm@xmission.com, vgoyal@redhat.com, Prakhar Srivastava , Prakhar Srivastava Subject: [PATCH v2 2/3 RFC] use event name instead of enum to make the call generic Date: Fri, 19 Apr 2019 17:15:42 -0700 Message-Id: <20190420001543.6760-2-prsriva02@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190420001543.6760-1-prsriva02@gmail.com> References: <20190420001543.6760-1-prsriva02@gmail.com> Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Prakhar Srivastava Signed-off-by: Prakhar Srivastava --- Currently for soft reboot(kexec_file_load) the kernel file and signature is measured by IMA. The cmdline args used to load the kernel is not measured. The boot aggregate that gets calculated will have no change since the EFI loader has not been triggered. Adding the kexec cmdline args measure and kernel version will add some attestable criteria. remove enums to control type of buffers entries, instead pass the event name to be used. include/linux/ima.h | 10 ++-------- kernel/kexec_file.c | 3 +++ security/integrity/ima/ima.h | 2 +- security/integrity/ima/ima_main.c | 30 ++++++++++-------------------- 4 files changed, 16 insertions(+), 29 deletions(-) diff --git a/include/linux/ima.h b/include/linux/ima.h index 733d0cb9dedc..5e41507c57e5 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -14,12 +14,6 @@ #include struct linux_binprm; -enum __buffer_id { - KERNEL_VERSION, - KEXEC_CMDLINE, - MAX_BUFFER_ID = KEXEC_CMDLINE -} buffer_id; - #ifdef CONFIG_IMA extern int ima_bprm_check(struct linux_binprm *bprm); extern int ima_file_check(struct file *file, int mask, int opened); @@ -29,7 +23,7 @@ extern int ima_read_file(struct file *file, enum kernel_read_file_id id); extern int ima_post_read_file(struct file *file, void *buf, loff_t size, enum kernel_read_file_id id); extern void ima_post_path_mknod(struct dentry *dentry); -extern void ima_buffer_check(const void *buff, int size, enum buffer_id id); +extern void ima_buffer_check(const void *buff, int size, char *eventname); #ifdef CONFIG_IMA_KEXEC extern void ima_add_kexec_buffer(struct kimage *image); #endif @@ -72,7 +66,7 @@ static inline void ima_post_path_mknod(struct dentry *dentry) } static inline void ima_buffer_check(const void *buff, int size, - enum buffer_id id) + char *eventname) { return; } diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index b118735fea9d..2a5234eb4b28 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -182,6 +182,9 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd, ret = -EINVAL; goto out; } + + ima_buffer_check(image->cmdline_buf, cmdline_len - 1, + "kexec_cmdline"); } /* Call arch image load handlers */ diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index b71f2f6f7421..fcade3c103ed 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -181,8 +181,8 @@ enum ima_hooks { FIRMWARE_CHECK, KEXEC_KERNEL_CHECK, KEXEC_INITRAMFS_CHECK, - BUFFER_CHECK, POLICY_CHECK, + BUFFER_CHECK, MAX_CHECK }; diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 6408cadaadbb..da82c705a5ed 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -160,8 +160,7 @@ void ima_file_free(struct file *file) * (Instead of using the file hash the buffer hash is used). * @buff - The buffer that needs to be added to the log * @size - size of buffer(in bytes) - * @id - buffer id, this is differentiator for the various buffers - * that can be measured. + * @id - eventname, event name to be used for buffer measurement. * * The buffer passed is added to the ima logs. * If the sig template is used, then the sig field contains the buffer. @@ -170,7 +169,7 @@ void ima_file_free(struct file *file) * On error cases surface errors from ima calls. */ static int process_buffer_measurement(const void *buff, int size, - enum buffer_id id) + char *eventname) { int ret = -EINVAL; struct ima_template_entry *entry = NULL; @@ -185,23 +184,13 @@ static int process_buffer_measurement(const void *buff, int size, int violation = 0; int pcr = CONFIG_IMA_MEASURE_PCR_IDX; - if (!buff || size == 0) + if (!buff || size == 0 || !eventname) goto err_out; if (ima_get_action(NULL, 0, BUFFER_CHECK, &pcr) != IMA_MEASURE) goto err_out; - switch (buffer_id) { - case KERNEL_VERSION: - name = "Kernel-version"; - break; - case KEXEC_CMDLINE: - name = "Kexec-cmdline"; - break; - default: - goto err_out; - } - + name = eventname; memset(iint, 0, sizeof(*iint)); memset(&hash, 0, sizeof(hash)); @@ -452,15 +441,16 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) * ima_buffer_check - based on policy, collect & store buffer measurement * @buf: pointer to buffer * @size: size of buffer - * @buffer_id: caller identifier + * @eventname: caller identifier * * Buffers can only be measured, not appraised. The buffer identifier - * is used as the measurement list entry name (eg. boot_cmdline). + * is used as the measurement list entry name (eg. boot_cmdline, + * kernel_version). */ -void ima_buffer_check(const void *buf, int size, enum buffer_id id) +void ima_buffer_check(const void *buf, int size, char *eventname) { - if (buf && size != 0) - process_buffer_measurement(buf, size, id); + if (buf && size != 0 && eventname) + process_buffer_measurement(buf, size, eventname); return; }