linux-kernel - Re: [RFC PATCH security-next 3/4] hornet: Add an example lskel data extactor script

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Message-ID: <Z97yiwQwzHmVy2p9@kernel.org>
Date: Sat, 22 Mar 2025 19:25:31 +0200
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Blaise Boscaccy <bboscaccy@...ux.microsoft.com>
Cc: Jonathan Corbet <corbet@....net>, David Howells <dhowells@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>, Shuah Khan <shuah@...nel.org>,
	Mickaël Salaün <mic@...ikod.net>,
	Günther Noack <gnoack@...gle.com>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Jan Stancek <jstancek@...hat.com>, Neal Gompa <neal@...pa.dev>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-kbuild@...r.kernel.org,
	linux-kselftest@...r.kernel.org, bpf@...r.kernel.org,
	llvm@...ts.linux.dev, nkapron@...gle.com, teknoraver@...a.com,
	roberto.sassu@...wei.com, xiyou.wangcong@...il.com
Subject: Re: [RFC PATCH security-next 3/4] hornet: Add an example lskel data
 extactor script

On Fri, Mar 21, 2025 at 09:45:05AM -0700, Blaise Boscaccy wrote:
> This script eases lskel developments against hornet by generating the

1. What iskel?
2. Why hornet is here in lower case?

> data payload used for code signing. It extracts the data out of the
> autogenerated lskel header that gets created via bpftool.
> 
> Signed-off-by: Blaise Boscaccy <bboscaccy@...ux.microsoft.com>
> ---
>  scripts/hornet/extract-skel.sh | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>  create mode 100755 scripts/hornet/extract-skel.sh
> 
> diff --git a/scripts/hornet/extract-skel.sh b/scripts/hornet/extract-skel.sh
> new file mode 100755
> index 0000000000000..9ace78794b85e
> --- /dev/null
> +++ b/scripts/hornet/extract-skel.sh
> @@ -0,0 +1,29 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Copyright (c) 2025 Microsoft Corporation
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of version 2 of the GNU General Public
> +# License as published by the Free Software Foundation.
> +
> +function usage() {
> +    echo "Sample script for extracting instructions and map data out of"
> +    echo "autogenerated eBPF lskel headers"
> +    echo ""
> +    echo "USAGE: header_file output_file"
> +    exit
> +}
> +
> +ARGC=$#
> +
> +EXPECTED_ARGS=2
> +
> +if [ $ARGC -ne $EXPECTED_ARGS ] ; then
> +    usage
> +else
> +    printf $(gcc -E $1 | grep "static const char opts_insn" | \
> +		 awk -F"=" '{print $2}' | sed 's/;\+$//' | sed 's/\"//g') > $2
> +    printf $(gcc -E $1 | grep "static const char opts_data" | \
> +		 awk -F"=" '{print $2}' | sed 's/;\+$//' | sed 's/\"//g') >> $2
> +fi
> -- 
> 2.48.1
> 

BR, Jarkko