8b0ecbccf4
Signed-off-by: Shaun Case <warmsocks@gmail.com> Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
59 lines
1.7 KiB
Perl
Executable file
59 lines
1.7 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 iteration 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
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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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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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