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Neels Hofmeyr gerrit-no-reply at lists.osmocom.orgReview at https://gerrit.osmocom.org/1940 contrib: add script to find unterminated value_string arrays Unterminated value_string arrays are dangerous since get_value_string() and get_string_value() need to know where the struct ends. If the terminator is missing, they might run through and return arbitrary memory locations. Employ some regexes to find such unterminated value string arrays and return nonzero if any are found. This can be used in our jenkins build jobs to avoid committing unterminated value_string arrays. In fact I've found one in current libosmocore: gsm0808_bssap_names in gsm/gsm0808.c, fixed in a separate patch. Change-Id: I2bc93ab4781487e7685cfb63091a489cd126b1a8 --- A contrib/verify_value_string_arrays_are_terminated.py 1 file changed, 34 insertions(+), 0 deletions(-) git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/40/1940/1 diff --git a/contrib/verify_value_string_arrays_are_terminated.py b/contrib/verify_value_string_arrays_are_terminated.py new file mode 100755 index 0000000..51c0bd4 --- /dev/null +++ b/contrib/verify_value_string_arrays_are_terminated.py @@ -0,0 +1,34 @@ +#!/usr/bin/env python +# vim: expandtab tabstop=2 shiftwidth=2 nocin + +''' +Usage: + verify_value_string_arrays_are_terminated.py PATH [PATH [...]] + +e.g. +libosmocore/contrib/verify_value_string_arrays_are_terminated.py $(find . -name "*.[hc]") +''' + +import re +import sys + +ws = r'\s*' + '\n' + r'*\s*' + +value_string_array_re = re.compile( + r'((\bstruct\s+value_string\b[^{;]*?)' + ws + '=[^{;]*{[^;]*}\s*;)', + re.MULTILINE | re.DOTALL) + +members = r'(\.(value|str)' + ws + '=' + ws + ')?' +terminator_re = re.compile('{' + ws + members + '(0|NULL)' + ws + ',' + + ws + members + '(0|NULL)' + ws + '}') +errors_found = 0 + +for f in sys.argv[1:]: + arrays = value_string_array_re.findall(open(f).read()) + for array_def, name in arrays: + if not terminator_re.search(array_def): + print('ERROR: file contains unterminated value_string %r: %r' + % (name, f)) + errors_found += 1 + +sys.exit(errors_found) -- To view, visit https://gerrit.osmocom.org/1940 To unsubscribe, visit https://gerrit.osmocom.org/settings Gerrit-MessageType: newchange Gerrit-Change-Id: I2bc93ab4781487e7685cfb63091a489cd126b1a8 Gerrit-PatchSet: 1 Gerrit-Project: libosmocore Gerrit-Branch: master Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>