From patchwork Wed Jul 31 22:16:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Garrett X-Patchwork-Id: 11069679 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 881111395 for ; Wed, 31 Jul 2019 22:19:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7672927F17 for ; Wed, 31 Jul 2019 22:19:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6A9EF27F81; Wed, 31 Jul 2019 22:19:03 +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=-14.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,RCVD_IN_DNSWL_HI,USER_IN_DEF_DKIM_WL 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 BF84727F17 for ; Wed, 31 Jul 2019 22:19:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728938AbfGaWTC (ORCPT ); Wed, 31 Jul 2019 18:19:02 -0400 Received: from mail-pf1-f201.google.com ([209.85.210.201]:56781 "EHLO mail-pf1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731317AbfGaWRK (ORCPT ); Wed, 31 Jul 2019 18:17:10 -0400 Received: by mail-pf1-f201.google.com with SMTP id x10so44197134pfa.23 for ; Wed, 31 Jul 2019 15:17:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=dLYiAr9hqix+w29Ej2S74ESH31+c2YOxCuX5zuQe/lQ=; b=J+R9NUO+EGzhsAS+m7c7T6iL5dyKw3ljJgj6BiTleClCqjtCkL+kDdezdvcfJsGDJ3 4cZ/Pja44HS7lRZcjKwU+essKoGJAGX49BZChnDX5eS3gUwv132EaOLiDNO5ingG5GjE Hltl6luJSw70OVN8qxNs+3AsY1u8GWtW5bBKTx6/LtlzUyenj1VnNDQo5j53whvNvE5S 3f/HX7+8T9WT81XFNhC83MGeSW2rLzVeUBBdJUwfOrA1GWSDXG+SZizQGxgdAofeB7+V 5mqdOiQZj3P1HA5clhctegxqzkvrJ15LJWEBdBUrocyOqFQzzQSuDIddJnpvNnIkBYoO sD2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=dLYiAr9hqix+w29Ej2S74ESH31+c2YOxCuX5zuQe/lQ=; b=jPJxQvKSCePHKdmFk86nb9Fe908Ai/N3Bw//RkC3QSY6dY2gcSA9RjlIwhVQxO6phe IOL+xJrDz7m9t3o9+dEDyIRfaJSNzD3jLY6CnBJReaK+7/2bY5HVVHN7IOBsDuatpKT0 79eybL4TCy5h8RUmtJ3H+mhGdeYleF5c+qqI9K4gtqfXxbon4edjcsDsY5/Z3tFasgyB xMzcynONpP7OANPvDQR9JRxMvlln4ZpEzJuDnfKonF1kpUCutd6I7g5f496FqahLWk3F 25Trw6R/M1Cn7GDGkEPS2Y/XpY6k8S73W+fS1StD2B7zn9cz/qRHabNq6IzU+vyyw49L TUpg== X-Gm-Message-State: APjAAAUvo8Bx/Qc7xe/z1r3jwbOect9ADRpVtBiyZEdqCB33GPXCIhlc cn36qa4186nMXmqIiEXv0sMc6Pnb3xO5iZChbFX0NQ== X-Google-Smtp-Source: APXvYqwQus0lJGImYcSy61wdfORdev9zJKBsUr+9s8EamtAjx/4lM5SZqKuI6SuBut2QwhBzvMi/sB17oQh+vRzaoIESNQ== X-Received: by 2002:a63:6c46:: with SMTP id h67mr107976504pgc.248.1564611429249; Wed, 31 Jul 2019 15:17:09 -0700 (PDT) Date: Wed, 31 Jul 2019 15:16:05 -0700 In-Reply-To: <20190731221617.234725-1-matthewgarrett@google.com> Message-Id: <20190731221617.234725-18-matthewgarrett@google.com> Mime-Version: 1.0 References: <20190731221617.234725-1-matthewgarrett@google.com> X-Mailer: git-send-email 2.22.0.770.g0f2c4a37fd-goog Subject: [PATCH V37 17/29] Prohibit PCMCIA CIS storage when the kernel is locked down From: Matthew Garrett To: jmorris@namei.org Cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, David Howells , Dominik Brodowski , Matthew Garrett , Kees Cook Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP From: David Howells Prohibit replacement of the PCMCIA Card Information Structure when the kernel is locked down. Suggested-by: Dominik Brodowski Signed-off-by: David Howells Signed-off-by: Matthew Garrett Reviewed-by: Kees Cook --- drivers/pcmcia/cistpl.c | 5 +++++ include/linux/security.h | 1 + security/lockdown/lockdown.c | 1 + 3 files changed, 7 insertions(+) diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c index abd029945cc8..629359fe3513 100644 --- a/drivers/pcmcia/cistpl.c +++ b/drivers/pcmcia/cistpl.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include @@ -1575,6 +1576,10 @@ static ssize_t pccard_store_cis(struct file *filp, struct kobject *kobj, struct pcmcia_socket *s; int error; + error = security_locked_down(LOCKDOWN_PCMCIA_CIS); + if (error) + return error; + s = to_socket(container_of(kobj, struct device, kobj)); if (off) diff --git a/include/linux/security.h b/include/linux/security.h index 1c32522b3c5a..3773ad09b831 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -111,6 +111,7 @@ enum lockdown_reason { LOCKDOWN_IOPORT, LOCKDOWN_MSR, LOCKDOWN_ACPI_TABLES, + LOCKDOWN_PCMCIA_CIS, LOCKDOWN_INTEGRITY_MAX, LOCKDOWN_CONFIDENTIALITY_MAX, }; diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c index ecb51b1a5c03..22482e1b9a77 100644 --- a/security/lockdown/lockdown.c +++ b/security/lockdown/lockdown.c @@ -26,6 +26,7 @@ static char *lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1] = { [LOCKDOWN_IOPORT] = "raw io port access", [LOCKDOWN_MSR] = "raw MSR access", [LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables", + [LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage", [LOCKDOWN_INTEGRITY_MAX] = "integrity", [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality", };