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87 lines
2.7 KiB
Perl
Executable File
87 lines
2.7 KiB
Perl
Executable File
#!/usr/bin/env perl
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# Find functions making recursive calls to themselves.
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# (Multiple recursion where a() calls b() which calls a() not covered.)
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#
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# When the recursion depth might depend on data controlled by the attacker in
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# an unbounded way, those functions should use interation instead.
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#
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# Typical usage: scripts/recursion.pl library/*.c
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#
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# Copyright The Mbed TLS Contributors
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# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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#
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# This file is provided under the Apache License 2.0, or the
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# GNU General Public License v2.0 or later.
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#
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# **********
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# Apache License 2.0:
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# **********
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#
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# **********
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# GNU General Public License v2.0 or later:
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# **********
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use warnings;
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use strict;
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use utf8;
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use open qw(:std utf8);
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# exclude functions that are ok:
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# - mpi_write_hlp: bounded by size of mbedtls_mpi, a compile-time constant
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# - x509_crt_verify_child: bounded by MBEDTLS_X509_MAX_INTERMEDIATE_CA
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my $known_ok = qr/mpi_write_hlp|x509_crt_verify_child/;
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my $cur_name;
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my $inside;
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my @funcs;
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die "Usage: $0 file.c [...]\n" unless @ARGV;
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while (<>)
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{
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if( /^[^\/#{}\s]/ && ! /\[.*]/ ) {
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chomp( $cur_name = $_ ) unless $inside;
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} elsif( /^{/ && $cur_name ) {
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$inside = 1;
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$cur_name =~ s/.* ([^ ]*)\(.*/$1/;
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} elsif( /^}/ && $inside ) {
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undef $inside;
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undef $cur_name;
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} elsif( $inside && /\b\Q$cur_name\E\([^)]/ ) {
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push @funcs, $cur_name unless /$known_ok/;
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}
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}
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print "$_\n" for @funcs;
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exit @funcs;
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