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#!/usr/bin/env python
#
# alt-revdep-pax: this file is part of the elfix package
# Copyright (C) 2011 Anthony G. Basile
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
#
# Note: This alternative way of doing revdep-pax only
# works on Gentoo systems where NEEDED.ELF.2 all the
# information we need generated by scanelf during emerge.
#
# See /usr/lib/portage/bin/misc-functions.sh ~line 520
# echo "${arch:3};${obj};${soname};${rpath};${needed}" >> "${PORTAGE_BUILDDIR}"/build-info/NEEDED.ELF.2
#
import getopt
import os
import sys
import pax
from link_map import LinkMap
def get_input(prompt):
""" python2/3 compat input """
if sys.hexversion > 0x03000000:
return input(prompt)
else:
return raw_input(prompt)
def print_problems(elfs_without_flags, sonames_without_flags, sonames_missing_library):
elfs_without_flags = set(elfs_without_flags)
print('\n**** ELF objections without any PAX flags ****')
for m in elfs_without_flags:
print('\t%s' % m)
sonames_without_flags = set(sonames_without_flags)
print('\n**** SONAMEs with library files without PAX flags ****')
for m in sonames_without_flags:
print('\t%s' % m)
sonames_missing_library = set(sonames_missing_library)
print('\n**** SONAMES without any library files ****')
for m in sonames_missing_library:
print('\t%s' % m)
def run_forward(verbose):
(object_linkings, object_reverse_linkings, library2soname, soname2library) = LinkMap().get_maps()
elfs_without_flags = []
sonames_without_flags = []
sonames_missing_library = []
for abi in object_linkings:
for elf in object_linkings[abi]:
try:
(elf_str_flags, elf_bin_flags) = pax.getflags(elf)
sv = '%s :%s ( %s )' % (elf, abi, elf_str_flags)
s = sv
except pax.PaxError:
elfs_without_flags.append(elf)
continue
count = 0
for soname in object_linkings[abi][elf]:
try:
library = soname2library[(soname,abi)]
(library_str_flags, library_bin_flags) = pax.getflags(library)
sv = '%s\n\t%s\t%s ( %s )' % (sv, soname, library, library_str_flags)
if elf_str_flags != library_str_flags:
s = '%s\n\t%s\t%s ( %s )' % (s, soname, library, library_str_flags)
count = count + 1
except KeyError:
sonames_missing_library.append(soname)
except pax.PaxError:
sonames_without_flags.append(soname)
if verbose:
print('%s\n' % sv)
if count == 0:
print('\tNo mismatches\n\n')
else:
print('\tMismatches\n\n')
else:
if count != 0:
print('%s\n\n' % s)
if verbose:
print_problems(elfs_without_flags, sonames_without_flags, sonames_missing_library)
def run_reverse(verbose, executable_only):
(object_linkings, object_reverse_linkings, library2soname, soname2library) = LinkMap().get_maps()
shell_path = path = os.getenv('PATH').split(':')
elfs_without_flags = []
sonames_without_flags = []
sonames_missing_library = []
for abi in object_reverse_linkings:
for soname in object_reverse_linkings[abi]:
try:
library = soname2library[(soname,abi)]
(library_str_flags, library_bin_flags) = pax.getflags(library)
sv = '%s\t%s :%s ( %s )' % (soname, library, abi, library_str_flags)
s = sv
except KeyError:
sonames_missing_library.append(soname)
except pax.PaxError:
sonames_without_flags.append(soname)
count = 0
for elf in object_reverse_linkings[abi][soname]:
try:
(elf_str_flags, elf_bin_flags) = pax.getflags(elf)
if executable_only:
if os.path.dirname(elf) in shell_path:
sv = '%s\n\t%s ( %s )' % (sv, elf, elf_str_flags)
if library_str_flags != elf_str_flags:
s = '%s\n\t%s ( %s )' % (s, elf, elf_str_flags)
count = count + 1
else:
sv = '%s\n\t%s ( %s )' % (sv, elf, elf_str_flags)
if library_str_flags != elf_str_flags:
s = '%s\n\t%s ( %s )' % (s, elf, elf_str_flags)
count = count + 1
except pax.PaxError:
elfs_without_flags.append(elf)
if verbose:
print('%s\n' % sv)
if count == 0:
print('\tNo mismatches\n\n')
else:
print('\tMismatches\n\n')
else:
if count != 0:
print('%s\n\n' % s)
if verbose:
print_problems( elfs_without_flags, sonames_without_flags, sonames_missing_library)
def migrate_flags(importer, exporter_str_flags, exporter_bin_flags):
# We implement the following logic for setting the pax flags
# on the target elf object, the IMPORTER, given that the flags
# from the elf object we want it to match to, the EXPORTER.
#
# EXPORTER IMPORTER RESULT
# On On On
# On Off On + Warn
# On - On
# Off On On + Warn
# Off Off Off
# Off - Off
# - On On
# - Off Off
# - - -
#See /usr/include/elf.h for these values
pf_flags = {
'P':1<<4, 'p':1<<5,
'S':1<<6, 's':1<<7,
'M':1<<8, 'm':1<<9,
'X':1<<10, 'x':1<<11,
'E':1<<12, 'e':1<<13,
'R':1<<14, 'r':1<<15
}
(importer_str_flags, importer_bin_flags) = pax.getflags(importer)
# Start with the exporter's flags
result_bin_flags = exporter_bin_flags
for i in range(len(importer_str_flags)):
# The exporter's flag contradicts the importer's flag, so do nothing
if (exporter_str_flags[i].isupper() and importer_str_flags[i].islower()) or \
(exporter_str_flags[i].islower() and importer_str_flags[i].isupper()):
# Revert the exporter's flag, use the importer's flag and warn
result_bin_flags = result_bin_flags ^ pf_flags[exporter_str_flags[i]]
result_bin_flags = result_bin_flags | pf_flags[importer_str_flags[i]]
print('\t\tWarning: %s has %s, refusing to set to %s' % (
importer, importer_str_flags[i], exporter_str_flags[i] )),
# The exporter's flags is off, so use the importer's flag
if (exporter_str_flags[i] == '-' and importer_str_flags[i] != '-'):
result_bin_flags = result_bin_flags | pf_flags[importer_str_flags[i]]
pax.setbinflags(importer, result_bin_flags)
def run_elf(elf, verbose, mark, allyes):
if not os.path.exists(elf):
print('%s\tNo such OBJECT' % elf)
return
try:
(elf_str_flags, elf_bin_flags) = pax.getflags(elf)
print('%s (%s)\n' % (elf, elf_str_flags))
except pax.PaxError:
print('%s: No PAX flags found\n' % elf)
return
(object_linkings, object_reverse_linkings, library2soname, soname2library) = LinkMap().get_maps()
mismatched_libraries = []
for abi in object_linkings:
if not elf in object_linkings[abi]: # There may be no elf for that abi
continue
for soname in object_linkings[abi][elf]:
try:
library = soname2library[(soname,abi)]
(library_str_flags, library_bin_flags) = pax.getflags(library)
if verbose:
print('\t%s\t%s :%s ( %s )' % (soname, library, abi, library_str_flags))
if elf_str_flags != library_str_flags:
mismatched_libraries.append(library)
if not verbose:
print('\t%s\t%s :%s ( %s )' % (soname, library, abi, library_str_flags))
except pax.PaxError:
print('%s :%s: file for soname not found' % (soname,abi))
if len(mismatched_libraries) == 0:
if not verbose:
print('\tNo mismatches\n')
else:
print('\n'),
if mark:
print('\tWill mark libraries with %s\n' % elf_str_flags)
for library in mismatched_libraries:
do_marking = False
while True:
if allyes:
ans = 'y'
else:
ans = get_input('\tSet flags for %s :%s (y/n): ' % (library,abi))
if ans == 'y':
do_marking = True
break
elif ans == 'n':
do_marking = False
break
else:
print('\t\tPlease enter y or n')
if do_marking:
try:
migrate_flags(library, elf_str_flags, elf_bin_flags)
except pax.PaxError:
print('\n\tCould not set PAX flags on %s, text maybe busy' % (library,abi))
try:
(library_str_flags, library_bin_flags) = pax.getflags(library)
print('\n\t\t%s ( %s )\n' % (library, library_str_flags))
except pax.PaxError:
print('\n\t\t%s: Could not read PAX flags')
def run_soname(name, verbose, use_soname, mark, allyes, executable_only):
shell_path = path = os.getenv('PATH').split(':')
(object_linkings, object_reverse_linkings, library2soname, soname2library) = LinkMap().get_maps()
if use_soname:
soname = name
abi_list = object_reverse_linkings.keys()
for abi in abi_list:
# There must be at least on abi with that soname
if soname in object_reverse_linkings[abi]:
break
else:
print('%s\tNo such SONAME' % soname)
return
else:
try:
(soname, abi) = library2soname[name]
abi_list = [abi]
except KeyError:
print('%s\tNo such LIBRARY' % name)
return
mismatched_elfs = []
for abi in abi_list:
# An soname can belong to one or more abis
if not soname in object_reverse_linkings[abi]:
continue
library = soname2library[(soname,abi)]
(library_str_flags, library_bin_flags) = pax.getflags(library)
print('%s\t%s :%s (%s)\n' % (soname, library, ", ".join(abi_list), library_str_flags))
for elf in object_reverse_linkings[abi][soname]:
try:
(elf_str_flags, elf_bin_flags ) = pax.getflags(elf)
if verbose:
if executable_only:
if os.path.dirname(elf) in shell_path:
print('\t%s ( %s )' % (elf, elf_str_flags ))
else:
print('\t%s ( %s )' % ( elf, elf_str_flags ))
if library_str_flags != elf_str_flags:
if executable_only:
if os.path.dirname(elf) in shell_path:
mismatched_elfs.append(elf)
if not verbose:
print('\t%s ( %s )' % (elf, elf_str_flags ))
else:
mismatched_elfs.append(elf)
if not verbose:
print('\t%s ( %s )' % (elf, elf_str_flags ))
except pax.PaxError:
# If you can't get the pax flags, then its automatically mismatched
if executable_only:
if os.path.dirname(elf) in shell_path:
mismatched_elfs.append(elf)
if not verbose:
print('\t%s ( %s )' % (elf, '****' ))
else:
mismatched_elfs.append(elf)
if not verbose:
print('\t%s ( %s )' % (elf, '****' ))
if len(mismatched_elfs) == 0:
if not verbose:
print('\tNo mismatches\n')
else:
print('\n'),
if mark:
print('\tWill mark elf with %s\n' % library_str_flags)
for elf in mismatched_elfs:
if executable_only:
if not os.path.dirname(elf) in shell_path:
continue
do_marking = False
while True:
if allyes:
ans = 'y'
else:
ans = get_input('\tSet flags for %s (y/n): ' % elf)
if ans == 'y':
do_marking = True
break
elif ans == 'n':
do_marking = False
break
else:
print('\t\tPlease enter y or n')
if do_marking:
try:
migrate_flags(elf, library_str_flags, library_bin_flags)
except pax.PaxError:
print('\n\tCould not set pax flags on %s, file is probably busy' % elf)
print('\tShut down all processes that use it and try again')
(elf_str_flags, elf_bin_flags) = pax.getflags(elf)
print('\n\t\t%s ( %s )\n' % (elf, elf_str_flags ))
def run_usage():
print('Package Name : elfix')
print('Bug Reports : http://bugs.gentoo.org/')
print('Program Name : revdep-pax')
print('Description : Get or set pax flags on an ELF object')
print('')
print('Usage : revdep-pax -f [-v] print out all forward mappings for all system ELF objects')
print(' : revdep-pax -r [-ve] print out all reverse mappings for all system sonames')
print(' : revdep-pax -b OBJECT [-myv] print all forward mappings only for OBJECT')
print(' : revdep-pax -s SONAME [-myve] print all reverse mappings only for SONAME')
print(' : revdep-pax -l LIBRARY [-myve] print all reverse mappings only for LIBRARY file')
print(' : revdep-pax [-h] print out this help')
print(' : -v verbose, otherwise just print mismatching objects')
print(' : -e only print out executables in shell $PATH')
print(' : -m don\'t just report, but mark the mismatching objects')
print(' : -y assume "yes" to all prompts for marking (USE CAREFULLY!)')
print('')
def main():
# Are we root?
uid = os.getuid()
if uid != 0:
print('This program must be run as root')
sys.exit(1)
try:
opts, args = getopt.getopt(sys.argv[1:], 'hfrb:s:l:vemy')
except getopt.GetoptError as err:
print(str(err)) # will print something like 'option -a not recognized'
run_usage()
sys.exit(1)
if len(opts) == 0:
run_usage()
sys.exit(1)
do_usage = False
do_forward = False
do_reverse = False
elf = None
soname = None
library = None
verbose = False
executable_only = False
mark = False
allyes = False
opt_count = 0
for o, a in opts:
if o == '-h':
do_usage = True
opt_count += 1
elif o == '-f':
do_forward = True
opt_count += 1
elif o == '-r':
do_reverse = True
opt_count += 1
elif o == '-b':
elf = a
opt_count += 1
elif o == '-s':
soname = a
opt_count += 1
elif o == '-l':
library = a
opt_count += 1
elif o == '-v':
verbose = True
elif o == '-e':
executable_only = True
elif o == '-m':
mark = True
elif o == '-y':
allyes = True
else:
print('Option included in getopt but not handled here!')
print('Please file a bug')
sys.exit(1)
# Only allow one of -h, -f -r -b -s
if opt_count > 1 or do_usage:
run_usage()
elif do_forward:
run_forward(verbose)
elif do_reverse:
run_reverse(verbose, executable_only)
elif elf != None:
run_elf(elf, verbose, mark, allyes)
elif soname != None:
run_soname(soname, verbose, True, mark, allyes, executable_only)
elif library != None:
library = os.path.realpath(library)
run_soname(library, verbose, False, mark, allyes, executable_only)
if __name__ == '__main__':
main()
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