From 36b8eb3ce55602bcf36199330e98f2e154225cf7 Mon Sep 17 00:00:00 2001
From: Stefano Brivio <sbrivio@redhat.com>
Date: Tue, 25 Oct 2022 15:19:55 +0200
Subject: seitan: Initial import

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
 transform.sh | 160 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100755 transform.sh

(limited to 'transform.sh')

diff --git a/transform.sh b/transform.sh
new file mode 100755
index 0000000..1e9eaeb
--- /dev/null
+++ b/transform.sh
@@ -0,0 +1,160 @@
+#!/bin/sh -eu
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+# SEITAN - Syscall Expressive Interpreter, Transformer and Notifier
+#
+# transform.sh - Build syscall transformation table headers
+#
+# Copyright (c) 2022 Red Hat GmbH
+# Author: Stefano Brivio <sbrivio@redhat.com>
+
+TMP="$(mktemp)"
+IN="${@}"
+OUT="transform.h"
+
+HEADER="/* This file was automatically generated by $(basename ${0}) */
+
+struct table {
+	int type;
+	long number;
+	char arg[1024][6];
+};"
+
+# Prefix for each profile
+PRE='
+struct table table_@PROFILE@[] = {'
+
+# Suffix for each profile
+POST='};
+'
+
+# cleanup() - Remove temporary file if it exists
+cleanup() {
+	rm -f "${TMP}"
+}
+trap "cleanup" EXIT
+
+# sub() - Substitute in-place file line with processed template line
+# $1:	Line number
+# $2:	Template name (variable name)
+# $@:	Replacement for @KEY@ in the form KEY:value
+sub() {
+	IFS=
+	__line_no="${1}"
+	__template="$(eval printf '%s' "\${${2}}")"
+	shift; shift
+
+	sed -i "${__line_no}s#.*#${__template}#" "${TMP}"
+
+	IFS=' '
+	for __def in ${@}; do
+		__key="@${__def%%:*}@"
+		__value="${__def#*:}"
+		sed -i "${__line_no}s/${__key}/${__value}/" "${TMP}"
+	done
+	unset IFS
+}
+
+# finish() - Finalise header file from temporary files with prefix and suffix
+# $1:	Variable name of prefix
+# $@:	Replacements for prefix variable
+finish() {
+	IFS=
+	__out="$(eval printf '%s' "\${${1}}")"
+	shift
+
+	IFS=' '
+	for __def in ${@}; do
+		__key="@${__def%%:*}@"
+		__value="${__def#*:}"
+		__out="$(printf '%s' "${__out}" | sed "s#${__key}#${__value}#")"
+	done
+
+	printf '%s\n' "${__out}" >> "${OUT}"
+	cat "${TMP}" >> "${OUT}"
+	rm "${TMP}"
+	printf '%s' "${POST}" >> "${OUT}"
+	unset IFS
+}
+
+# syscall_nr - Get syscall number from compiler
+# $1:	Name of syscall
+syscall_nr() {
+	__in="$(printf "#include <asm-generic/unistd.h>\n#include <sys/syscall.h>\n__NR_%s" ${1})"
+	__out="$(echo "${__in}" | cc -E -xc - -o - | tail -1)"
+	[ "${__out}" = "__NR_$1" ] && return 1
+
+	# Output might be in the form "(x + y)" (seen on armv6l, armv7l)
+	__out="$(eval echo $((${__out})))"
+	echo "${__out}"
+}
+
+filter() {
+	__filtered=
+	for __c in ${@}; do
+		__arch_match=0
+		case ${__c} in
+		*:*)
+			case ${__c} in
+			$(uname -m):*)
+				__arch_match=1
+				__c=${__c##*:}
+				;;
+			esac
+			;;
+		*)
+			__arch_match=1
+			;;
+		esac
+		[ ${__arch_match} -eq 0 ] && continue
+
+		IFS='| '
+		__found=0
+		for __name in ${__c}; do
+			syscall_nr "${__name}" >/dev/null && __found=1 && break
+		done
+		unset IFS
+
+		if [ ${__found} -eq 0 ]; then
+			echo
+			echo "Warning: no syscall number for ${__c}" >&2
+			echo "  none of these syscalls will be allowed" >&2
+			continue
+		fi
+
+		__filtered="${__filtered} ${__name}"
+	done
+
+	echo "${__filtered}" | tr ' ' '\n' | sort -u
+}
+
+printf '%s\n' "${HEADER}" > "${OUT}"
+__profiles="${IN}"
+for __p in ${__profiles}; do
+	IFS='
+'
+	for __l in $(grep "^[a-z].*" "${__p}" | tr -s '\t'); do
+		unset IFS
+		__syscall_token="$(echo "${__l}" | cut -f1)"
+		__type_token="$(echo "${__l}" | cut -f2)"
+		__arg1_token="$(echo "${__l}" | cut -f3)"
+		__arg2_token="$(echo "${__l}" | cut -f4)"
+		__arg3_token="$(echo "${__l}" | cut -f5)"
+		__arg4_token="$(echo "${__l}" | cut -f6)"
+		__arg5_token="$(echo "${__l}" | cut -f7)"
+		__arg6_token="$(echo "${__l}" | cut -f8)"
+
+		__syscall_nr="$(syscall_nr "${__syscall_token}")"
+		__type_enum="$(echo ${__type_token} | tr [a-z] [A-Z])"
+
+		printf "\t{ %i, %s, \"%s\", \"%s\", \"%s\", \"%s\", \"%s\", \"%s\", },\n" \
+			${__syscall_nr} "${__type_enum}" \
+			"${__arg1_token}" "${__arg2_token}" "${__arg3_token}" \
+			"${__arg4_token}" "${__arg5_token}" "${__arg6_token}" \
+			>> "${TMP}"
+	IFS='
+'
+	done
+	finish PRE "PROFILE:${__p}"
+done
-- 
cgit v1.2.3