From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932411Ab2IDPzv (ORCPT ); Tue, 4 Sep 2012 11:55:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52242 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757135Ab2IDPzr (ORCPT ); Tue, 4 Sep 2012 11:55:47 -0400 From: Matthew Garrett To: linux-kernel@vger.kernel.org Cc: linux-security-module@vger.kernel.org, linux-efi@vger.kernel.org, Josh Boyer Subject: [PATCH 08/11] Secure boot: Add a dummy kernel parameter that will switch on Secure Boot mode Date: Tue, 4 Sep 2012 11:55:14 -0400 Message-Id: <1346774117-2277-9-git-send-email-mjg@redhat.com> In-Reply-To: <1346774117-2277-1-git-send-email-mjg@redhat.com> References: <1346774117-2277-1-git-send-email-mjg@redhat.com> X-SA-Do-Not-Run: Yes X-SA-Exim-Connect-IP: 66.187.233.206 X-SA-Exim-Mail-From: mjg@redhat.com X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Josh Boyer This forcibly drops CAP_SECURE_FIRMWARE from both cap_permitted and cap_bset in the init_cred struct, which everything else inherits from. This works on any machine and can be used to develop even if the box doesn't have UEFI. Signed-off-by: Josh Boyer --- kernel/cred.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/kernel/cred.c b/kernel/cred.c index de728ac..47669a9 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -623,6 +623,23 @@ void __init cred_init(void) 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); } +void __init secureboot_enable() +{ + pr_info("Secure boot enabled\n"); + cap_lower((&init_cred)->cap_bset, CAP_SECURE_FIRMWARE); + cap_lower((&init_cred)->cap_permitted, CAP_SECURE_FIRMWARE); +} + +/* Dummy Secure Boot enable option to fake out UEFI SB=1 */ +static int __init secureboot_enable_opt(char *str) +{ + int sb_enable = !!simple_strtol(str, NULL, 0); + if (sb_enable) + secureboot_enable(); + return 1; +} +__setup("secureboot_enable=", secureboot_enable_opt); + /** * prepare_kernel_cred - Prepare a set of credentials for a kernel service * @daemon: A userspace daemon to be used as a reference -- 1.7.11.4