From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756803Ab2IUI1K (ORCPT ); Fri, 21 Sep 2012 04:27:10 -0400 Received: from smtp.nue.novell.com ([195.135.221.5]:59690 "EHLO smtp.nue.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756445Ab2IUI1E (ORCPT ); Fri, 21 Sep 2012 04:27:04 -0400 Subject: Re: [PATCH V2 07/10] Secure boot: Add a dummy kernel parameter that will switch on Secure Boot mode From: joeyli To: Matthew Garrett Cc: linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-efi@vger.kernel.org, Josh Boyer In-Reply-To: <1348152065-31353-8-git-send-email-mjg@redhat.com> References: <1348152065-31353-1-git-send-email-mjg@redhat.com> <1348152065-31353-8-git-send-email-mjg@redhat.com> Content-Type: text/plain; charset="UTF-8" Date: Fri, 21 Sep 2012 16:20:53 +0800 Message-ID: <1348215653.5337.94.camel@linux-s257.site> Mime-Version: 1.0 X-Mailer: Evolution 2.28.2 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 於 四，2012-09-20 於 10:41 -0400，Matthew Garrett 提到： > From: Josh Boyer > > This forcibly drops CAP_COMPROMISE_KERNEL 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 Patch works to me for test lock the IO port access. Tested-by: Lee, Chun-Yi Joey Lee > --- > kernel/cred.c | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/kernel/cred.c b/kernel/cred.c > index de728ac..7e6e83f 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_COMPROMISE_KERNEL); > + cap_lower((&init_cred)->cap_permitted, CAP_COMPROMISE_KERNEL); > +} > + > +/* 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