linux-kernel - [PATCH v3 3/4] hornet: Add a light skeleton data extractor script

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Message-ID: <20250502184421.1424368-4-bboscaccy@linux.microsoft.com>
Date: Fri,  2 May 2025 11:44:09 -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,
	nkapron@...gle.com,
	teknoraver@...a.com,
	roberto.sassu@...wei.com,
	xiyou.wangcong@...il.com,
	Tyler Hicks <code@...icks.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>
Subject: [PATCH v3 3/4] hornet: Add a light skeleton data extractor script

This script eases light skeleton development against Hornet by
generating a data payload which can be used for signing a light
skeleton binary using sign-ebpf. The binary payload it generates
contains the skeleton's ebpf instructions followed by the skeleton
loader's map.

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 000000000000..9ace78794b85
--- /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