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

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Message-ID: <20250321164537.16719-4-bboscaccy@linux.microsoft.com>
Date: Fri, 21 Mar 2025 09:45:05 -0700
From: Blaise Boscaccy <bboscaccy@...ux.microsoft.com>
To: 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>,
	Blaise Boscaccy <bboscaccy@...ux.microsoft.com>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	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,
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Subject: [RFC PATCH security-next 3/4] hornet: Add an example lskel data extactor script

This script eases lskel developments against hornet by generating the
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