cppcheck/addons/y2038.py

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#!/usr/bin/env python3
#
# cppcheck addon for Y2038 safeness detection
#
# Detects:
#
# 1. _TIME_BITS being defined to something else than 64 bits
# 2. _USE_TIME_BITS64 being defined when _TIME_BITS is not
# 3. Any Y2038-unsafe symbol when _USE_TIME_BITS64 is not defined.
#
# Example usage:
# $ cppcheck --dump path-to-src/test.c
# $ y2038.py path-to-src/test.c.dump
#
# y2038.py will walk the source tree for .dump files.
from __future__ import print_function
import cppcheckdata
import sys
import os
import re
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# --------------------------------------------
# #define/#undef detection regular expressions
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# --------------------------------------------
# test for '#define _TIME_BITS 64'
re_define_time_bits_64 = re.compile(r'^\s*#\s*define\s+_TIME_BITS\s+64\s*$')
# test for '#define _TIME_BITS ...' (combine w/ above to test for 'not 64')
re_define_time_bits = re.compile(r'^\s*#\s*define\s+_TIME_BITS\s+.*$')
# test for '#undef _TIME_BITS' (if it ever happens)
re_undef_time_bits = re.compile(r'^\s*#\s*undef\s+_TIME_BITS\s*$')
# test for '#define _USE_TIME_BITS64'
re_define_use_time_bits64 = re.compile(r'^\s*#\s*define\s+_USE_TIME_BITS64\s*$')
# test for '#undef _USE_TIME_BITS64' (if it ever happens)
re_undef_use_time_bits64 = re.compile(r'^\s*#\s*undef\s+_USE_TIME_BITS64\s*$')
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# --------------------------------
# List of Y2038-unsafe identifiers
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# --------------------------------
# This is WIP. Eventually it should contain all identifiers (types
# and functions) which would be affected by the Y2038 bug.
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id_Y2038 = {
# Y2038-unsafe types by definition
'time_t'
# Types using Y2038-unsafe types
'lastlog',
'msqid_ds',
'semid_ds',
'timeb',
'timespec',
'timeval',
'utimbuf',
'itimerspec',
'stat',
'clnt_ops',
'elf_prstatus',
'itimerval',
'ntptimeval',
'rusage',
'timex',
'utmp',
'utmpx',
# APIs using 2038-unsafe types
'ctime',
'ctime_r',
'difftime',
'gmtime',
'gmtime_r',
'localtime',
'localtime_r',
'mktime',
'stime',
'timegm',
'timelocal',
'time',
'msgctl',
'ftime',
'aio_suspend',
'clock_getres',
'clock_gettime',
'clock_nanosleep',
'clock_settime',
'futimens',
'mq_timedreceive',
'mq_timedsend',
'nanosleep',
'pselect',
'pthread_cond_timedwait',
'pthread_mutex_timedlock',
'pthread_rwlock_timedrdlock',
'pthread_rwlock_timedwrlock',
'sched_rr_get_interval',
'sem_timedwait',
'sigtimedwait',
'timespec_get',
'utimensat',
'adjtime',
'pmap_rmtcall',
'clntudp_bufcreate',
'clntudp_create',
'futimes',
'gettimeofday',
'lutimes',
'select',
'settimeofday',
'utimes',
'utime',
'timerfd_gettime',
'timerfd_settime',
'timer_gettime',
'timer_settime',
'fstatat',
'fstat',
'__fxstatat',
'__fxstat',
'lstat',
'__lxstat',
'stat',
'__xstat',
'struct itimerval',
'setitimer',
'getitimer',
'ntp_gettime',
'getrusage',
'wait3',
'wait4',
'adjtimex',
'ntp_adjtime',
'getutent_r',
'getutent',
'getutid_r',
'getutid',
'getutline_r',
'getutline',
'login',
'pututline',
'updwtmp',
'getutxent',
'getutxid',
'getutxline',
'pututxline'
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}
def check_y2038_safe(dumpfile, quiet=False):
# Assume that the code is Y2038 safe until proven otherwise
y2038safe = True
# load XML from .dump file
data = cppcheckdata.parsedump(dumpfile)
# Convert dump file path to source file in format generated by cppcheck.
# For example after the following call:
# cppcheck ./src/my-src.c --dump
# We got 'src/my-src.c' value for 'file' field in cppcheckdata.
srcfile = dumpfile.rstrip('.dump')
srcfile = os.path.expanduser(srcfile)
srcfile = os.path.normpath(srcfile)
# go through each configuration
for cfg in data.configurations:
if not quiet:
print('Checking ' + srcfile + ', config "' + cfg.name + '"...')
safe_ranges = []
safe = -1
time_bits_defined = False
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srclinenr = '0'
for directive in cfg.directives:
# track source line number
if directive.file == srcfile:
srclinenr = directive.linenr
# check for correct _TIME_BITS if present
if re_define_time_bits_64.match(directive.str):
time_bits_defined = True
elif re_define_time_bits.match(directive.str):
cppcheckdata.reportError(directive, 'error',
'_TIME_BITS must be defined equal to 64',
'y2038',
'type-bits-not-64')
time_bits_defined = False
y2038safe = False
elif re_undef_time_bits.match(directive.str):
time_bits_defined = False
# check for _USE_TIME_BITS64 (un)definition
if re_define_use_time_bits64.match(directive.str):
safe = int(srclinenr)
# warn about _TIME_BITS not being defined
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if not time_bits_defined:
cppcheckdata.reportError(directive, 'warning',
'_USE_TIME_BITS64 is defined but _TIME_BITS was not',
'y2038',
'type-bits-undef')
elif re_undef_use_time_bits64.match(directive.str):
unsafe = int(srclinenr)
# do we have a safe..unsafe area?
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if unsafe > safe > 0:
safe_ranges.append((safe, unsafe))
safe = -1
# check end of source beyond last directive
if len(cfg.tokenlist) > 0:
unsafe = int(cfg.tokenlist[-1].linenr)
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if unsafe > safe > 0:
safe_ranges.append((safe, unsafe))
# go through all tokens
for token in cfg.tokenlist:
if token.str in id_Y2038:
if not any(lower <= int(token.linenr) <= upper
for (lower, upper) in safe_ranges):
cppcheckdata.reportError(token, 'warning',
token.str + ' is Y2038-unsafe',
'y2038',
'unsafe-call')
y2038safe = False
token = token.next
return y2038safe
def get_args():
parser = cppcheckdata.ArgumentParser()
return parser.parse_args()
if __name__ == '__main__':
args = get_args()
exit_code = 0
quiet = not any((args.quiet, args.cli))
if not args.dumpfile:
if not args.quiet:
print("no input files.")
sys.exit(0)
for dumpfile in args.dumpfile:
if not os.path.isfile(dumpfile):
print("Error: File not found: %s" % dumpfile)
sys.exit(127)
if not os.access(dumpfile, os.R_OK):
print("Error: Permission denied: %s" % dumpfile)
sys.exit(13)
if not args.quiet:
print('Checking ' + dumpfile + '...')
y2038safe = check_y2038_safe(dumpfile, quiet)
if not y2038safe and exit_code == 0:
exit_code = 1
sys.exit(exit_code)