Re: [PATCH v2 2/5] selftests/ima: define a set of common functions

[shuah <shuah@kernel.org>]

On 2/26/19 4:26 PM, Mimi Zohar wrote:
> Define, update and move get_secureboot_mode() to a common file for use
> by other tests.
> 
> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
> Reviewed-by: Petr Vorel <pvorel@suse.cz>
> ---
>   tools/testing/selftests/ima/Makefile           |  1 +
>   tools/testing/selftests/ima/common_lib.sh      | 24 ++++++++++++++++++++++++
>   tools/testing/selftests/ima/test_kexec_load.sh | 17 +++--------------
>   3 files changed, 28 insertions(+), 14 deletions(-)
>   create mode 100755 tools/testing/selftests/ima/common_lib.sh
> 
> diff --git a/tools/testing/selftests/ima/Makefile b/tools/testing/selftests/ima/Makefile
> index 0b3adf5444b6..46b9e04d2737 100644
> --- a/tools/testing/selftests/ima/Makefile
> +++ b/tools/testing/selftests/ima/Makefile
> @@ -5,6 +5,7 @@ ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
>   
>   ifeq ($(ARCH),x86)
>   TEST_PROGS := test_kexec_load.sh
> +TEST_FILES := common_lib.sh
>   
>   include ../lib.mk
>   
> diff --git a/tools/testing/selftests/ima/common_lib.sh b/tools/testing/selftests/ima/common_lib.sh
> new file mode 100755
> index 000000000000..5583ea74c14e
> --- /dev/null
> +++ b/tools/testing/selftests/ima/common_lib.sh
> @@ -0,0 +1,24 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0-or-later

# SPDX-License-Identifier: GPL-2.0

> +
> +# 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".
> +# Return 1 for SecureBoot mode enabled.
> +get_secureboot_mode()
> +{
> +	local efivarfs="/sys/firmware/efi/efivars"
> +	# Make sure that efivars is mounted in the normal location
> +	if ! grep -q "^\S\+ $efivarfs efivarfs" /proc/mounts; then
> +		echo "$TEST: efivars is not mounted on $efivarfs" >&2
> +		exit $ksft_skip
> +	fi
> +
> +	# Get secureboot mode
> +	local file="$efivarfs/../vars/SecureBoot-*/data"
> +	if [ ! -e $file ]; then
> +		echo "$TEST: unknown secureboot mode" >&2
> +		exit $ksft_skip
> +	fi
> +	return `od -An -t u1 /sys/firmware/efi/vars/SecureBoot-*/data`
> +}
> diff --git a/tools/testing/selftests/ima/test_kexec_load.sh b/tools/testing/selftests/ima/test_kexec_load.sh
> index 0345803e7bec..35934e0665f1 100755
> --- a/tools/testing/selftests/ima/test_kexec_load.sh
> +++ b/tools/testing/selftests/ima/test_kexec_load.sh
> @@ -5,7 +5,7 @@
>   # is booted in secureboot mode.
>   
>   TEST="$0"
> -EFIVARFS="/sys/firmware/efi/efivars"
> +. ./common_lib.sh
>   rc=0
>   
>   # Kselftest framework requirement - SKIP code is 4.
> @@ -17,19 +17,8 @@ if [ $(id -ru) -ne 0 ]; then
>   	exit $ksft_skip
>   fi
>   
> -# Make sure that efivars is mounted in the normal location
> -if ! grep -q "^\S\+ $EFIVARFS efivarfs" /proc/mounts; then
> -	echo "$TEST: efivars is not mounted on $EFIVARFS" >&2
> -	exit $ksft_skip
> -fi
> -
> -# Get secureboot mode
> -file="$EFIVARFS/SecureBoot-*"
> -if [ ! -e $file ]; then
> -	echo "$TEST: unknown secureboot mode" >&2
> -	exit $ksft_skip
> -fi
> -secureboot=`hexdump $file | awk '{print substr($4,length($4),1)}'`
> +get_secureboot_mode
> +secureboot=$?
>   
>   # kexec_load should fail in secure boot mode
>   KERNEL_IMAGE="/boot/vmlinuz-`uname -r`"
> 

The rest looks good to me.

thanks,
-- Shuah