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|
#!/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
|
