From patchwork Sat Jun 6 05:04:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Scott Branden X-Patchwork-Id: 11591053 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 BB82790 for ; Sat, 6 Jun 2020 05:07:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A29BB207DF for ; Sat, 6 Jun 2020 05:07:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="NGT8PX7I" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728666AbgFFFHa (ORCPT ); Sat, 6 Jun 2020 01:07:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46536 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728657AbgFFFHa (ORCPT ); Sat, 6 Jun 2020 01:07:30 -0400 Received: from mail-pg1-x52a.google.com (mail-pg1-x52a.google.com [IPv6:2607:f8b0:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5296EC08C5C2 for ; Fri, 5 Jun 2020 22:07:30 -0700 (PDT) Received: by mail-pg1-x52a.google.com with SMTP id m1so6179977pgk.1 for ; Fri, 05 Jun 2020 22:07:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=7w1pN6TotzpiP8sLo1RA7p/wzGRtcCXptjHTFNygcBg=; b=NGT8PX7IuxdZvUvnE+9nljMW33phBXq08GFl7NiLdp4D93EXGgpos4K81h9NlWK1hG 5PutkZ1ZGL8Z2Xu66AFY4+EPs9Lbba6aYdHNZaivUor0C1sSPBh88zP98A52Et54gs9S is1pzLGrQffKx6ad6j5zvcZtMjhFcK+uh0CdE= 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=7w1pN6TotzpiP8sLo1RA7p/wzGRtcCXptjHTFNygcBg=; b=fbMVmDIdwWWKnTcoVCcggrGTpZxa+jPlTHo/KOPBs50MfUszBnke5E5JzqygZNspYW zXN9tQPHkxic4CJAROaMHP8oNaWcs//2PmfJenbrhi4T2MfSj1LgYyiSigtM+5fr7Hcj /xj6cyHZqNg0B3gNvQXrmn34IeFwt0DLxJoOH7px0UTRP8NdAU/atBQeufPpYfzwuxTY 7wE6+gsNiPLcduZM8gkFUuyQEIcHga6Eu+MZEZjBgM7kqF65yyjBFVkgMTPZ+rjn/vTG 393CU+VKggXuTYjNPGnMiokcIWHAlQUZfwNNAOg3px17aAYxCNpf/a8CJc7E4ToWOavX dbFA== X-Gm-Message-State: AOAM531eYoMzXGKlq1i81dZzsGBxMb39Wf8YoH9UfyE7vpqxIvAlHIQZ IfSILSQw6xO1xkgIGMNceb7Wxg== X-Google-Smtp-Source: ABdhPJzkBAIGqCS+lOJr2U5KizL/ys0e8zYXSUIMTRAJ2mZmzJHn6qNrXl0+JbIGw2l5Kkz3LAyhDg== X-Received: by 2002:a62:8454:: with SMTP id k81mr12522487pfd.140.1591420049341; Fri, 05 Jun 2020 22:07:29 -0700 (PDT) Received: from lbrmn-lnxub113.broadcom.net ([192.19.228.250]) by smtp.gmail.com with ESMTPSA id v8sm1057636pfn.217.2020.06.05.22.07.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Jun 2020 22:07:28 -0700 (PDT) From: Scott Branden To: Luis Chamberlain , Wolfram Sang , Greg Kroah-Hartman , David Brown , Alexander Viro , Shuah Khan , bjorn.andersson@linaro.org, Shuah Khan , Arnd Bergmann Cc: Mimi Zohar , "Rafael J . Wysocki" , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-fsdevel@vger.kernel.org, BCM Kernel Feedback , Olof Johansson , Andrew Morton , Dan Carpenter , Colin Ian King , Kees Cook , Takashi Iwai , linux-kselftest@vger.kernel.org, Andy Gross , linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, Scott Branden Subject: [PATCH v7 8/8] ima: add FIRMWARE_PARTIAL_READ support Date: Fri, 5 Jun 2020 22:04:58 -0700 Message-Id: <20200606050458.17281-9-scott.branden@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200606050458.17281-1-scott.branden@broadcom.com> References: <20200606050458.17281-1-scott.branden@broadcom.com> Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Add FIRMWARE_PARTIAL_READ support for integrity measurement on partial reads of firmware files. Signed-off-by: Scott Branden --- drivers/base/firmware_loader/main.c | 6 +++++- fs/exec.c | 6 ++++-- include/linux/fs.h | 1 + security/integrity/ima/ima_main.c | 24 +++++++++++++++++++++++- 4 files changed, 33 insertions(+), 4 deletions(-) diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c index 93e7fee42cd4..d0c42194af17 100644 --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -483,7 +483,11 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv, /* Already populated data member means we're loading into a buffer */ if (!decompress && fw_priv->data) { buffer = fw_priv->data; - id = READING_FIRMWARE_PREALLOC_BUFFER; + if (fw_priv->opt == KERNEL_PREAD_PART) + id = READING_FIRMWARE_PARTIAL_READ; + else + id = READING_FIRMWARE_PREALLOC_BUFFER; + msize = fw_priv->allocated_size; } diff --git a/fs/exec.c b/fs/exec.c index 751f5ddc7538..06e2465d8d40 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -970,7 +970,8 @@ int kernel_pread_file(struct file *file, void **buf, loff_t *size, goto out; } - if (id != READING_FIRMWARE_PREALLOC_BUFFER) + if ((id != READING_FIRMWARE_PARTIAL_READ) && + (id != READING_FIRMWARE_PREALLOC_BUFFER)) *buf = vmalloc(alloc_size); if (!*buf) { ret = -ENOMEM; @@ -1002,7 +1003,8 @@ int kernel_pread_file(struct file *file, void **buf, loff_t *size, out_free: if (ret < 0) { - if (id != READING_FIRMWARE_PREALLOC_BUFFER) { + if ((id != READING_FIRMWARE_PARTIAL_READ) && + (id != READING_FIRMWARE_PREALLOC_BUFFER)) { vfree(*buf); *buf = NULL; } diff --git a/include/linux/fs.h b/include/linux/fs.h index aee7600958ef..1180091d704d 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3020,6 +3020,7 @@ extern int do_pipe_flags(int *, int); #define __kernel_read_file_id(id) \ id(UNKNOWN, unknown) \ id(FIRMWARE, firmware) \ + id(FIRMWARE_PARTIAL_READ, firmware) \ id(FIRMWARE_PREALLOC_BUFFER, firmware) \ id(FIRMWARE_EFI_EMBEDDED, firmware) \ id(MODULE, kernel-module) \ diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 800fb3bba418..fc5134807acf 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -609,6 +609,9 @@ void ima_post_path_mknod(struct dentry *dentry) */ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) { + enum ima_hooks func; + u32 secid; + /* * READING_FIRMWARE_PREALLOC_BUFFER * @@ -617,11 +620,27 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) * of IMA's signature verification any more than when using two * buffers? */ - return 0; + if (read_id != READING_FIRMWARE_PARTIAL_READ) + return 0; + + if (!file) { + if ((ima_appraise & IMA_APPRAISE_FIRMWARE) && + (ima_appraise & IMA_APPRAISE_ENFORCE)) { + pr_err("Prevent firmware loading_store.\n"); + return -EACCES; /* INTEGRITY_UNKNOWN */ + } + return 0; + } + + func = read_idmap[read_id] ?: FILE_CHECK; + security_task_getsecid(current, &secid); + return process_measurement(file, current_cred(), secid, NULL, + 0, MAY_READ, func); } const int read_idmap[READING_MAX_ID] = { [READING_FIRMWARE] = FIRMWARE_CHECK, + [READING_FIRMWARE_PARTIAL_READ] = FIRMWARE_CHECK, [READING_FIRMWARE_PREALLOC_BUFFER] = FIRMWARE_CHECK, [READING_MODULE] = MODULE_CHECK, [READING_KEXEC_IMAGE] = KEXEC_KERNEL_CHECK, @@ -648,6 +667,9 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size, enum ima_hooks func; u32 secid; + if (read_id == READING_FIRMWARE_PARTIAL_READ) + return 0; + if (!file && read_id == READING_FIRMWARE) { if ((ima_appraise & IMA_APPRAISE_FIRMWARE) && (ima_appraise & IMA_APPRAISE_ENFORCE)) {