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86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
#!/usr/bin/python3
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# Check ELF program headers for WX segments.
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# Copyright (C) 2020-2025 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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"""Check that the program headers do not contain write-exec segments."""
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import argparse
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import os.path
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import re
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import sys
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# Regular expression to extract the RWE flags field. The
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# address/offset columns have varying width.
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RE_LOAD = re.compile(
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r'^ LOAD +(?:0x[0-9a-fA-F]+ +){5}([R ][W ][ E]) +0x[0-9a-fA-F]+\n\Z')
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def process_file(path, inp, xfail):
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"""Analyze one input file."""
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errors = 0
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for line in inp:
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error = None
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if line.startswith(' LOAD '):
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match = RE_LOAD.match(line)
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if match is None:
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error = 'Invalid LOAD line'
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else:
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flags, = match.groups()
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if 'W' in flags and 'E' in flags:
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if xfail:
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print('{}: warning: WX segment (as expected)'.format(
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path))
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else:
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error = 'WX segment'
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if error is not None:
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print('{}: error: {}: {!r}'.format(path, error, line.strip()))
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errors += 1
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if xfail and errors == 0:
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print('{}: warning: missing expected WX segment'.format(path))
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return errors
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def main():
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"""The main entry point."""
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('--xfail',
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help='Mark input files as XFAILed ("*" for all)',
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type=str, default='')
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parser.add_argument('phdrs',
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help='Files containing readelf -Wl output',
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nargs='*')
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opts = parser.parse_args(sys.argv)
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xfails = set(opts.xfail.split(' '))
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xfails_all = opts.xfail.strip() == '*'
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errors = 0
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for path in opts.phdrs:
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xfail = ((os.path.basename(path) + '.phdrs') in xfails
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or xfails_all)
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with open(path) as inp:
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errors += process_file(path, inp, xfail)
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if errors > 0:
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sys.exit(1)
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if __name__ == '__main__':
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main()
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