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|
#!/usr/bin/env python
#
# 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 os
import re
import getopt
import sys
import pax
def get_object_needed():
var_db_pkg = '/var/db/pkg'
object_needed = {}
for cat in os.listdir(var_db_pkg):
catdir = '%s/%s' % (var_db_pkg, cat)
for pkg in os.listdir(catdir):
pkgdir = '%s/%s' % (catdir, pkg)
need = '%s/%s' % (pkgdir, 'NEEDED.ELF.2')
try:
g = open(need, 'r')
needs = g.readlines()
for line in needs:
line = line.strip()
link = re.split(';', line)
elf = link[1]
sonames = re.split(',', link[4])
object_needed[elf] = sonames
except IOError:
continue #File probably doesn't exist, which is okay
return object_needed
def run_usage():
print('Package Name : elfix')
print('Bug Reports : http://bugs.gentoo.org/')
print('Program Name : migrate')
print('Description : Migrate PT_PAX to XATTR_PAX Flags on all system ELF objects')
print('')
print('Usage : migrate -v print out all system ELF objects')
print(' : migrate -m [-v] migrate flags on all system ELF objects')
print(' : migrate -d [-v] delete XATTR_PAX on all system ELF objects')
print(' : migrate [-h] print out this help')
print(' : -v be verbose when migrating')
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:], 'vmdh')
except getopt.GetoptError as err:
print(str(err)) # will print something like 'option -a not recognized'
run_usage()
sys.exit(1)
verbose = False
do_migration = False
do_deleteall = False
do_usage = False
opt_count = 0
for o, a in opts:
if o == '-v':
verbose = True
opt_count += 1
elif o == '-m':
do_migration = True
opt_count += 1
elif o == '-d':
do_deleteall = True
opt_count += 1
elif o == '-h':
do_usage = True
opt_count += 1
else:
print('Option included in getopt but not handled here!')
print('Please file a bug')
sys.exit(1)
if do_usage:
run_usage()
sys.exit(0)
if opt_count == 0 or opt_count > 2 or ( do_migration and do_deleteall):
run_usage()
sys.exit(1)
# Do we have XATTR_PAX support?
if do_migration or do_deleteall:
try:
from pax import deletextpax
except ImportError:
print('ERROR: Python module pax.so was compiled without XATTR_PAX support, cannot migrate or delete XATTR_PAX')
sys.exit(1)
object_needed = get_object_needed()
fail = []
none = []
for elf in object_needed:
try:
flags = pax.getflags(elf)[0]
if flags:
if verbose:
print("%s %s" % (flags, elf))
else:
none.append(elf)
if verbose:
print("NONE: %s" % elf)
if do_migration:
flags = re.sub('-','',flags)
pax.setstrflags(elf, flags)
if do_deleteall:
pax.deletextpax(elf)
# We should never get here, because you can
# always getflags() via pax.so since you can
# read PT_PAX even from a busy text file, and
# you can always set the pax flags with pax.so
# even on a busy text file because it will skip
# setting PT_PAX and only set the XATTR_PAX
except pax.PaxError:
if uid == 0:
fail.append(elf)
if verbose:
print("FAIL: %s" % elf)
if verbose:
if fail:
print('\n')
print("ELF executables for which the migration failed:")
for elf in fail:
print("\t%s" % elf)
if none:
print('\n')
print("ELF executables lacking PT_PAX:")
for elf in none:
print("\t%s" % elf)
if __name__ == '__main__':
main()
|
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