From patchwork Thu Jun 16 12:47:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 12883818 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B295CCA47C for ; Thu, 16 Jun 2022 12:47:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231148AbiFPMry (ORCPT ); Thu, 16 Jun 2022 08:47:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229666AbiFPMry (ORCPT ); Thu, 16 Jun 2022 08:47:54 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D181F109B; Thu, 16 Jun 2022 05:47:51 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 41D426167F; Thu, 16 Jun 2022 12:47:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10851C3411C; Thu, 16 Jun 2022 12:47:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1655383670; bh=qucNDYIYgVCGTJMJ3sdpzySUORGf8r9vijq4+kXU8K4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nONDFAZ6lJCNL0rJaEqcl16s9H+EBiIVCKCGkvHL0GMuTUU02Silpb+lPSW7mPC9H DNTBXqTGxYd2TQulvaOKhyLV7bhsIVN9o9urQ8KuJ73SoPgslnPtK8x1XENw/R/dMY Wvgr8WSCRocW81DkWyF0pUq6q41DnA+DyqGUhEPKmk/22ma1kNvkp31SoNJLCwRZ5Q ZAMjSGRLCpAtillb8yxvnSi8fKBpmeUCct5pK/Yhe6cIVtNiMLysfY0x7QOsghif85 1zQzBfqRR36xcVUPgFAFhxfGvwBx8oixkewrzP8BIMcKA9JQer0znrcX+Ytdl2mtVT Yw6wguuL7WZsA== From: Ard Biesheuvel To: linux-efi@vger.kernel.org Cc: Ard Biesheuvel , Matthew Garrett , Peter Jones , Tony Luck , Kees Cook , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , linux-kselftest@vger.kernel.org, Shuah Khan , Mimi Zohar Subject: [RFC PATCH 1/2] selftests/kexec: remove broken EFI_VARS secure boot fallback check Date: Thu, 16 Jun 2022 14:47:39 +0200 Message-Id: <20220616124740.580708-2-ardb@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220616124740.580708-1-ardb@kernel.org> References: <20220616124740.580708-1-ardb@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3028; h=from:subject; bh=qucNDYIYgVCGTJMJ3sdpzySUORGf8r9vijq4+kXU8K4=; b=owEB7QES/pANAwAKAcNPIjmS2Y8kAcsmYgBiqyZpW6zfkCpUOh5lc1fvD6RyRo84exIiLU17eQCU mwj1sMCJAbMEAAEKAB0WIQT72WJ8QGnJQhU3VynDTyI5ktmPJAUCYqsmaQAKCRDDTyI5ktmPJG6oDA CkzZu9dAxo/Ckimn6Vr6RtYcNSZKVxLuL0gv03nUQM+2J9oBdptezOFzZrKDg4srKgKWFvCnBtFjvd XMyG1sGeXeXnwif/J3iotvcq3fLHtnaJmJd+ykqrchMp07ydvm9m2Q347PnN0mOtmSfU1ax9nab/tY XToCWah1ZAuTn0iweOauiNkQEmWeXUuxxuF082KVYMfdJMAXu1OjfDweves12AELuA0Y5M/x4bCdVK gncoH780+uKWgRE/Dhg/M9PDP/XPYfg2PFu8jaMnJrE9JrY8bGHiesEfoqfHStsvITu5nYpO9s3S/0 dttZwCoElBt77jpSAYoKfYRV/UIDt5VAFu8xam2erZObYr5sz/6HLshXhJbjuOFWhPo50z6j5OFEpv U+e6kO/bKUjV/N4HbUOJzncNwULAbdZabmHKOnNF2KB5r979Fc6Ua6GtZpo7xf44KLkJ8V8/MeHDEo RqrkSDFYnP6h3lBsjaDvk8Ir2PuNyyZVGbZGA0dW2mtXU= X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Commit b433a52aa28733e0 ("selftests/kexec: update get_secureboot_mode") refactored the code that discovers the EFI secure boot mode so it only depends on either the efivars pseudo filesystem or the efivars sysfs interface, but never both. However, the latter version was not implemented correctly, given the fact that the local 'efi_vars' variable never assumes a value. This means the fallback has been dead code ever since it was introduced. So let's drop the fallback altogether. The sysfs interface has been deprecated for ~10 years now, and is only enabled on x86 to begin with, so it is time to get rid of it entirely. Cc: Shuah Khan Cc: Mimi Zohar Signed-off-by: Ard Biesheuvel Reviewed-by: Mimi Zohar --- tools/testing/selftests/kexec/kexec_common_lib.sh | 36 ++------------------ 1 file changed, 2 insertions(+), 34 deletions(-) diff --git a/tools/testing/selftests/kexec/kexec_common_lib.sh b/tools/testing/selftests/kexec/kexec_common_lib.sh index 0e114b34d5d7..641ef05863b2 100755 --- a/tools/testing/selftests/kexec/kexec_common_lib.sh +++ b/tools/testing/selftests/kexec/kexec_common_lib.sh @@ -65,32 +65,6 @@ get_efivarfs_secureboot_mode() return 0; } -get_efi_var_secureboot_mode() -{ - local efi_vars - local secure_boot_file - local setup_mode_file - local secureboot_mode - local setup_mode - - if [ ! -d "$efi_vars" ]; then - log_skip "efi_vars is not enabled\n" - fi - secure_boot_file=$(find "$efi_vars" -name SecureBoot-* 2>/dev/null) - setup_mode_file=$(find "$efi_vars" -name SetupMode-* 2>/dev/null) - if [ -f "$secure_boot_file/data" ] && \ - [ -f "$setup_mode_file/data" ]; then - secureboot_mode=`od -An -t u1 "$secure_boot_file/data"` - setup_mode=`od -An -t u1 "$setup_mode_file/data"` - - if [ $secureboot_mode -eq 1 ] && [ $setup_mode -eq 0 ]; then - log_info "secure boot mode enabled (CONFIG_EFI_VARS)" - return 1; - fi - fi - return 0; -} - # On powerpc platform, check device-tree property # /proc/device-tree/ibm,secureboot/os-secureboot-enforcing # to detect secureboot state. @@ -113,9 +87,8 @@ get_arch() } # Check efivar SecureBoot-$(the UUID) and SetupMode-$(the UUID). -# The secure boot mode can be accessed either as the last integer -# of "od -An -t u1 /sys/firmware/efi/efivars/SecureBoot-*" or from -# "od -An -t u1 /sys/firmware/efi/vars/SecureBoot-*/data". The efi +# The secure boot mode can be accessed as the last integer of +# "od -An -t u1 /sys/firmware/efi/efivars/SecureBoot-*". The efi # SetupMode can be similarly accessed. # Return 1 for SecureBoot mode enabled and SetupMode mode disabled. get_secureboot_mode() @@ -129,11 +102,6 @@ get_secureboot_mode() else get_efivarfs_secureboot_mode secureboot_mode=$? - # fallback to using the efi_var files - if [ $secureboot_mode -eq 0 ]; then - get_efi_var_secureboot_mode - secureboot_mode=$? - fi fi if [ $secureboot_mode -eq 0 ]; then