linux-kernel - Re: [PATCH 2/3] scripts/ima: define a set of common functions

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Date:   Sun, 3 Feb 2019 22:19:58 +0100
From:   Petr Vorel <pvorel@...e.cz>
To:     Mimi Zohar <zohar@...ux.ibm.com>
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        David Howells <dhowells@...hat.com>,
        Dave Young <dyoung@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>
Subject: Re: [PATCH 2/3] scripts/ima: define a set of common functions

Hi Mimi,

> Define and move get_secureboot_mode() to a common file for use by other
> tests.

> Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
Reviewed-by: Petr Vorel <pvorel@...e.cz>
> ---
>  tools/testing/selftests/ima/common_lib.sh      | 20 ++++++++++++++++++++
>  tools/testing/selftests/ima/test_kexec_load.sh | 17 +++--------------
>  2 files changed, 23 insertions(+), 14 deletions(-)
>  create mode 100755 tools/testing/selftests/ima/common_lib.sh

> diff --git a/tools/testing/selftests/ima/common_lib.sh b/tools/testing/selftests/ima/common_lib.sh
> new file mode 100755
> index 000000000000..ae097a634da5
> --- /dev/null
> +++ b/tools/testing/selftests/ima/common_lib.sh
> @@ -0,0 +1,20 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0+
# SPDX-License-Identifier: GPL-2.0-or-later

> +
> +get_secureboot_mode()
> +{
> +	EFIVARFS="/sys/firmware/efi/efivars"
	local efivarfs="/sys/firmware/efi/efivars"
	local file
It's a good practise to use local keyword and lower case the name of the
variable for variables used only locally (if you treat $EFIVARFS as constant,
I'd move it outside of get_secureboot_mode()).
I personally try to avoid using global variables (except constant like).

> +	# 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
There could be helper function printing error and exit in selftest library.

> +	# Get secureboot mode
> +	file="$EFIVARFS/SecureBoot-*"
	file="$efivarfs/SecureBoot-*"

...
>  KERNEL_IMAGE="/boot/vmlinuz-`uname -r`"
Another candidate for helper for potential selftest library.

Kind regards,
Petr