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# $NetBSD: check-relro-elf.awk,v 1.3 2019/04/24 22:56:47 maya Exp $
#
# Copyright (c) 2007 Joerg Sonnenberger <joerg@NetBSD.org>.
# Copyright (c) 2017 Pierre Pronchery <khorben@NetBSD.org>.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Joerg Sonnenberger.
#
# Originally developed as part of Google's Summer of Code 2007 program.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Read a list of potential ELF binaries from stdin.
# For each, extract the list of program headers.
# Check that the GNU_RELRO header is present.
#
function shquote(IN, out) {
out = IN;
gsub("\\\\", "\\\\", out);
gsub("\\\n", "\\n", out);
gsub("\\\t", "\\t", out);
gsub(" ", "\\ ", out);
gsub("'", "\\'", out);
gsub("`", "\\`", out);
gsub("\"", "\\\"", out);
gsub(";", "\\;", out);
gsub("&", "\\&", out);
gsub("<", "\\<", out);
gsub(">", "\\>", out);
gsub("\\(", "\\(", out);
gsub("\\)", "\\)", out);
gsub("\\|", "\\|", out);
gsub("\\*", "\\*", out);
gsub("\\?", "\\?", out);
gsub("\\{", "\\{", out);
gsub("\\}", "\\}", out);
gsub("\\[", "\\[", out);
gsub("\\]", "\\]", out);
gsub("\\$", "\\$", out);
gsub("!", "\\!", out);
gsub("#", "\\#", out);
gsub("\\^", "\\^", out);
gsub("~", "\\~", out);
return out;
}
function checkrelro(ELF, got_relro, found) {
cmd = readelf " -Wl " shquote(ELF) " 2> /dev/null"
while ((cmd | getline) > 0) {
found = 1
if ($1 == "GNU_RELRO") {
got_relro = 1
}
# PT_INTERP for executables
# DYNAMIC for libraries, executables
if (($1 == "INTERP") ||
($1 == "DYNAMIC")) {
dynamic = 1
}
}
close(cmd)
if (found == 1 && dynamic == 1 && got_relro != 1) {
print ELF ": missing RELRO"
}
}
BEGIN {
readelf = ENVIRON["READELF"]
if (readelf == "")
readelf = "readelf"
}
{ checkrelro($0); }
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