/usr/bin/mklibs is in mklibs 0.1.41.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# mklibs.py: An automated way to create a minimal /lib/ directory.
#
# Copyright 2001 by Falk Hueffner <falk@debian.org>
# & Goswin Brederlow <goswin.brederlow@student.uni-tuebingen.de>
#
# mklibs.sh by Marcus Brinkmann <Marcus.Brinkmann@ruhr-uni-bochum.de>
# used as template
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# HOW IT WORKS
#
# - Gather all unresolved symbols and libraries needed by the programs
# and reduced libraries
# - Gather all symbols provided by the already reduced libraries
# (none on the first pass)
# - If all symbols are provided we are done
# - go through all libraries and remember what symbols they provide
# - go through all unresolved/needed symbols and mark them as used
# - for each library:
# - find pic file (if not present copy and strip the so)
# - compile in only used symbols
# - strip
# - back to the top
# TODO
# * complete argument parsing as given as comment in main
import string
import re
import sys
import os
import glob
import getopt
from stat import *
import subprocess
DEBUG_NORMAL = 1
DEBUG_VERBOSE = 2
DEBUG_SPAM = 3
debuglevel = DEBUG_NORMAL
def debug(level, *msg):
if debuglevel >= level:
print string.join(msg)
# return a list of lines of output of the command
def command(command, *args):
debug(DEBUG_SPAM, "calling", command, string.join(args))
pipe = os.popen(command + ' ' + ' '.join(args), 'r')
output = pipe.read().strip()
status = pipe.close()
if status is not None and os.WEXITSTATUS(status) != 0:
print "Command failed with status", os.WEXITSTATUS(status), ":", \
command, string.join(args)
print "With output:", output
sys.exit(1)
return [i for i in output.split('\n') if i]
# Filter a list according to a regexp containing a () group. Return
# a set.
def regexpfilter(list, regexp, groupnr = 1):
pattern = re.compile(regexp)
result = set()
for x in list:
match = pattern.match(x)
if match:
result.add(match.group(groupnr))
return result
def elf_header(obj):
if not os.access(obj, os.F_OK):
raise Exception("Cannot find lib: " + obj)
output = command("mklibs-readelf", "--print-elf-header", obj)
s = [int(i) for i in output[0].split()]
return {'class': s[0], 'data': s[1], 'machine': s[2], 'flags': s[3]}
# Return a set of rpath strings for the passed object
def rpath(obj):
if not os.access(obj, os.F_OK):
raise Exception("Cannot find lib: " + obj)
output = command("mklibs-readelf", "--print-rpath", obj)
return [root + "/" + x for x in output]
# Return a set of libraries the passed objects depend on.
def library_depends(obj):
if not os.access(obj, os.F_OK):
raise Exception("Cannot find lib: " + obj)
return command("mklibs-readelf", "--print-needed", obj)
# Return a list of libraries the passed objects depend on. The
# libraries are in "-lfoo" format suitable for passing to gcc.
def library_depends_gcc_libnames(obj):
if not os.access(obj, os.F_OK):
raise Exception("Cannot find lib: " + obj)
libs = library_depends(obj)
ret = []
for i in libs:
match = re.match("^(((?P<ld>ld\S*)|(lib(?P<lib>\S+))))\.so.*$", i)
if match:
if match.group('ld'):
ret.append(find_lib(match.group(0)))
elif match.group('lib'):
ret.append('-l%s' % match.group('lib'))
return ' '.join(ret)
class Symbol(object):
def __init__(self, name, version, library):
self.name, self.version, self.library = name, version, library
def __str__(self):
ret = [self.name]
if self.version:
ret.append(self.version)
if self.library:
ret.append(self.library)
return '@'.join(ret)
class UndefinedSymbol(Symbol):
def __init__(self, name, weak, version, library):
super(UndefinedSymbol, self).__init__(name, version, library)
self.weak, self.library = weak, library
def symbol_is_blacklisted(name):
# The ARM Embedded ABI spec states symbols under this namespace as
# possibly appearing in output objects.
if name.startswith("__aeabi_"):
return True
return False
# Return undefined symbols in an object as a set of tuples (name, weakness)
def undefined_symbols(obj):
if not os.access(obj, os.F_OK):
raise Exception("Cannot find lib" + obj)
output = command("mklibs-readelf", "--print-symbols-undefined", obj)
result = []
for line in output:
name, weak_string, version_string, library_string = line.split()[:4]
if symbol_is_blacklisted(name):
continue
weak = False
if weak_string.lower() == 'true':
weak = True
version = None
if version_string.lower() not in ('base', 'none'):
version = version_string
library = None
if library_string.lower() != 'none':
library = library_string
result.append(UndefinedSymbol(name, weak, version, library))
return result
class ProvidedSymbol(Symbol):
def __init__(self, name, version, library, default_version):
super(ProvidedSymbol, self).__init__(name, version, library)
self.default_version = default_version
def base_names(self):
ret = []
if self.version:
if self.library:
ret.append('@'.join((self.name, self.version, self.library)))
ret.append('@'.join((self.name, self.version)))
if self.default_version:
ret.append(self.name)
else:
ret.append(self.name)
return ret
def linker_name(self):
if self.default_version or not self.version:
return self.name
return '@'.join((self.name, self.version))
# Return a set of symbols provided by a library
def provided_symbols(obj):
if not os.access(obj, os.F_OK):
raise Exception("Cannot find lib" + obj)
library = extract_soname(obj)
output = command("mklibs-readelf", "--print-symbols-provided", obj)
result = []
for line in output:
name, weak_string, version_string, default_version_string = line.split()[:4]
version = None
if version_string.lower() not in ('base', 'none'):
version = version_string
default_version = False
if default_version_string.lower() == 'true':
default_version = True
result.append(ProvidedSymbol(name, version, library, default_version))
return result
# Return real target of a symlink
def resolve_link(file):
debug(DEBUG_SPAM, "resolving", file)
while S_ISLNK(os.lstat(file)[ST_MODE]):
new_file = os.readlink(file)
if new_file[0] != "/":
file = os.path.join(os.path.dirname(file), new_file)
else:
file = new_file
debug(DEBUG_SPAM, "resolved to", file)
return file
# Find complete path of a library, by searching in lib_path
def find_lib(lib):
for path in lib_path:
if os.access(sysroot + path + "/" + lib, os.F_OK):
return sysroot + path + "/" + lib
return ""
# Find a PIC archive for the library
def find_pic(lib):
base_name = so_pattern.match(lib).group(1)
for path in lib_path:
for file in glob.glob(sysroot + path + "/" + base_name + "_pic.a"):
if os.access(file, os.F_OK):
return resolve_link(file)
return ""
# Find a PIC .map file for the library
def find_pic_map(lib):
base_name = so_pattern.match(lib).group(1)
for path in lib_path:
for file in glob.glob(sysroot + path + "/" + base_name + "_pic.map"):
if os.access(file, os.F_OK):
return resolve_link(file)
return ""
def extract_soname(so_file):
soname_data = command("mklibs-readelf", "--print-soname", so_file)
if soname_data:
return soname_data.pop()
return ""
def multiarch(paths):
devnull = open('/dev/null', 'w')
dpkg_architecture = subprocess.Popen(
['dpkg-architecture', '-qDEB_HOST_MULTIARCH'],
stdout=subprocess.PIPE, stderr=devnull)
devnull.close()
deb_host_multiarch, _ = dpkg_architecture.communicate()
if dpkg_architecture.returncode == 0:
deb_host_multiarch = deb_host_multiarch.rstrip('\n')
new_paths = []
for path in paths:
new_paths.append(
path.replace('/lib', '/lib/%s' % deb_host_multiarch, 1))
new_paths.append(path)
return new_paths
else:
return paths
def usage(was_err):
if was_err:
outfd = sys.stderr
else:
outfd = sys.stdout
print >> outfd, "Usage: mklibs [OPTION]... -d DEST FILE ..."
print >> outfd, "Make a set of minimal libraries for FILE(s) in DEST."
print >> outfd, ""
print >> outfd, " -d, --dest-dir DIRECTORY create libraries in DIRECTORY"
print >> outfd, " -D, --no-default-lib omit default libpath (", ':'.join(default_lib_path), ")"
print >> outfd, " -L DIRECTORY[:DIRECTORY]... add DIRECTORY(s) to the library search path"
print >> outfd, " -l LIBRARY add LIBRARY always"
print >> outfd, " --ldlib LDLIB use LDLIB for the dynamic linker"
print >> outfd, " --libc-extras-dir DIRECTORY look for libc extra files in DIRECTORY"
print >> outfd, " --target TARGET prepend TARGET- to the gcc and binutils calls"
print >> outfd, " --root ROOT search in ROOT for library rpaths"
print >> outfd, " --sysroot ROOT prepend ROOT to all paths for libraries"
print >> outfd, " --gcc-options OPTIONS pass OPTIONS to gcc"
print >> outfd, " --libdir DIR use DIR (e.g. lib64) in place of lib in default paths"
print >> outfd, " -v, --verbose explain what is being done"
print >> outfd, " -h, --help display this help and exit"
sys.exit(was_err)
def version(vers):
print "mklibs: version ",vers
print ""
#################### main ####################
## Usage: ./mklibs.py [OPTION]... -d DEST FILE ...
## Make a set of minimal libraries for FILE ... in directory DEST.
##
## Options:
## -L DIRECTORY Add DIRECTORY to library search path.
## -D, --no-default-lib Do not use default lib directories of /lib:/usr/lib
## -n, --dry-run Don't actually run any commands; just print them.
## -v, --verbose Print additional progress information.
## -V, --version Print the version number and exit.
## -h, --help Print this help and exit.
## --ldlib Name of dynamic linker (overwrites environment variable ldlib)
## --libc-extras-dir Directory for libc extra files
## --target Use as prefix for gcc or binutils calls
##
## -d, --dest-dir DIRECTORY Create libraries in DIRECTORY.
##
## Required arguments for long options are also mandatory for the short options.
# Clean the environment
vers="0.12"
os.environ['LC_ALL'] = "C"
# Argument parsing
opts = "L:DnvVhd:r:l:"
longopts = ["no-default-lib", "dry-run", "verbose", "version", "help",
"dest-dir=", "ldlib=", "libc-extras-dir=", "target=", "root=",
"sysroot=", "gcc-options=", "libdir="]
# some global variables
lib_rpath = []
lib_path = []
dest_path = "DEST"
ldlib = "LDLIB"
include_default_lib_path = "yes"
default_lib_path = multiarch(["/lib/", "/usr/lib/", "/usr/X11R6/lib/"])
libc_extras_dir = "/usr/lib/libc_pic"
libc_extras_dir_default = True
libdir = "lib"
target = ""
root = ""
sysroot = ""
force_libs = []
gcc_options = []
so_pattern = re.compile("((lib|ld).*)\.so(\..+)*")
script_pattern = re.compile("^#!\s*/")
try:
optlist, proglist = getopt.getopt(sys.argv[1:], opts, longopts)
except getopt.GetoptError, msg:
print >> sys.stderr, msg
usage(1)
for opt, arg in optlist:
if opt in ("-v", "--verbose"):
if debuglevel < DEBUG_SPAM:
debuglevel = debuglevel + 1
elif opt == "-L":
lib_path.extend(string.split(arg, ":"))
elif opt in ("-d", "--dest-dir"):
dest_path = arg
elif opt in ("-D", "--no-default-lib"):
include_default_lib_path = "no"
elif opt == "--ldlib":
ldlib = arg
elif opt == "--libc-extras-dir":
libc_extras_dir = arg
libc_extras_dir_default = False
elif opt == "--target":
target = arg + "-"
elif opt in ("-r", "--root"):
root = arg
elif opt == "--sysroot":
sysroot = arg
elif opt in ("-l",):
force_libs.append(arg)
elif opt == "--gcc-options":
gcc_options.extend(string.split(arg, " "))
elif opt == "--libdir":
libdir = arg
elif opt in ("--help", "-h"):
usage(0)
sys.exit(0)
elif opt in ("--version", "-V"):
version(vers)
sys.exit(0)
else:
print "WARNING: unknown option: " + opt + "\targ: " + arg
if include_default_lib_path == "yes":
lib_path.extend([a.replace("/lib/", "/" + libdir + "/") for a in default_lib_path])
if libc_extras_dir_default:
libc_extras_dir = libc_extras_dir.replace("/lib/", "/" + libdir + "/")
for path in multiarch([libc_extras_dir]):
if os.path.isdir(path):
libc_extras_dir = path
break
if ldlib == "LDLIB":
ldlib = os.getenv("ldlib")
objects = {} # map from inode to filename
for prog in proglist:
inode = os.stat(prog)[ST_INO]
if objects.has_key(inode):
debug(DEBUG_SPAM, prog, "is a hardlink to", objects[inode])
elif so_pattern.match(prog):
debug(DEBUG_SPAM, prog, "is a library")
elif script_pattern.match(open(prog).read(256)):
debug(DEBUG_SPAM, prog, "is a script")
else:
objects[inode] = prog
if not ldlib:
for obj in objects.values():
output = command("mklibs-readelf", "--print-interp", obj)
if output:
ldlib = output.pop()
if ldlib:
break
if not ldlib:
sys.exit("E: Dynamic linker not found, aborting.")
debug(DEBUG_NORMAL, "I: Using", ldlib, "as dynamic linker.")
# Check for rpaths
for obj in sorted(objects.values()):
rpath_val = rpath(obj)
if rpath_val:
if root:
for rpath_elem in rpath_val:
if not rpath_elem in lib_rpath:
if debuglevel >= DEBUG_VERBOSE:
print "Adding rpath " + rpath_elem + " for " + obj
lib_rpath.append(rpath_elem)
else:
print "warning: " + obj + " may need rpath, but --root not specified"
lib_path.extend(lib_rpath)
passnr = 1
available_libs = []
previous_pass_unresolved = set()
while 1:
debug(DEBUG_NORMAL, "I: library reduction pass", `passnr`)
if debuglevel >= DEBUG_VERBOSE:
print "Objects:",
for obj in sorted([x[string.rfind(x, '/') + 1:] for x in objects.values()]):
print obj,
print
passnr = passnr + 1
# Gather all already reduced libraries and treat them as objects as well
small_libs = []
for lib in regexpfilter(os.listdir(dest_path), "(.*-so-stripped)$"):
obj = dest_path + "/" + lib
small_libs.append(obj)
inode = os.stat(obj)[ST_INO]
if objects.has_key(inode):
debug(DEBUG_SPAM, obj, "is hardlink to", objects[inode])
else:
objects[inode] = obj
# DEBUG
for obj in sorted(objects.values()):
small_libs.append(obj)
debug(DEBUG_VERBOSE, "Object:", obj)
# calculate what symbols and libraries are needed
needed_symbols = {}
libraries = set(force_libs)
for obj in sorted(objects.values()):
for symbol in undefined_symbols(obj):
# Some undefined symbols in libthread_db are defined in
# the application that uses it. __gnu_local_gp is defined
# specially by the linker on MIPS.
if (not (re.search("libthread_db\.so", obj)
and re.search("^ps_", str(symbol)))
and not (re.search("ld-linux.so.3$", str(symbol)))
and not (re.search("^__gnu_local_gp", str(symbol)))):
debug(DEBUG_SPAM, "needed_symbols adding %s, weak: %s" % (symbol, symbol.weak))
needed_symbols[str(symbol)] = symbol
libraries.update(library_depends(obj))
# calculate what symbols are present in small_libs and available_libs
present_symbols = {}
checked_libs = small_libs
checked_libs.extend(available_libs)
checked_libs.append(ldlib)
for lib in checked_libs:
for symbol in provided_symbols(lib):
debug(DEBUG_SPAM, "present_symbols adding %s" % symbol)
names = symbol.base_names()
for name in names:
present_symbols[name] = symbol
# are we finished?
num_unresolved = 0
unresolved = set()
for name in needed_symbols:
if not name in present_symbols:
debug(DEBUG_SPAM, "Still need: %s" % name)
unresolved.add(name)
num_unresolved = num_unresolved + 1
debug (DEBUG_NORMAL, `len(needed_symbols)`, "symbols,",
`num_unresolved`, "unresolved")
if num_unresolved == 0:
break
if unresolved == previous_pass_unresolved:
# No progress in last pass. Verify all remaining symbols are weak.
for name in unresolved:
if not needed_symbols[name].weak:
raise Exception("Unresolvable symbol %s" % name)
break
previous_pass_unresolved = unresolved
library_symbols = {}
library_symbols_used = {}
symbol_provider = {}
# WORKAROUND: Always add libgcc on old-abi arm
header = elf_header(find_lib(libraries.copy().pop()))
if header['machine'] == 40 and header['flags'] & 0xff000000 == 0:
libraries.add('libgcc_s.so.1')
# Calculate all symbols each library provides
for library in libraries:
path = find_lib(library)
if not path:
sys.exit("Library not found: " + library + " in path: "
+ ':'.join(lib_path))
symbols = provided_symbols(path)
library_symbols[library] = {}
library_symbols_used[library] = set()
for symbol in symbols:
for name in symbol.base_names():
if name in symbol_provider:
debug(DEBUG_SPAM, "duplicate symbol %s in %s and %s" % (symbol, symbol_provider[name], library))
else:
library_symbols[library][name] = symbol
symbol_provider[name] = library
# which symbols are actually used from each lib
for name in needed_symbols:
if not name in symbol_provider:
if not needed_symbols[name].weak:
raise Exception("No library provides non-weak %s" % name)
else:
lib = symbol_provider[name]
library_symbols_used[lib].add(library_symbols[lib][name])
# reduce libraries
for library in sorted(libraries):
debug(DEBUG_VERBOSE, "reducing", library)
debug(DEBUG_SPAM, "using: " + ' '.join([str(i) for i in library_symbols_used[library]]))
so_file = find_lib(library)
if root and (re.compile("^" + root).search(so_file)):
debug(DEBUG_VERBOSE, "no action required for " + so_file)
if not so_file in available_libs:
debug(DEBUG_VERBOSE, "adding " + so_file + " to available libs")
available_libs.append(so_file)
continue
so_file_name = os.path.basename(so_file)
if not so_file:
sys.exit("File not found:" + library)
pic_file = find_pic(library)
if not pic_file:
# No pic file, so we have to use the .so file, no reduction
debug(DEBUG_VERBOSE, "No pic file found for", so_file, "; copying")
command(target + "objcopy", "--strip-unneeded -R .note -R .comment",
so_file, dest_path + "/" + so_file_name + "-so-stripped")
else:
# we have a pic file, recompile
debug(DEBUG_SPAM, "extracting from:", pic_file, "so_file:", so_file)
soname = extract_soname(so_file)
if soname == "":
debug(DEBUG_VERBOSE, so_file, " has no soname, copying")
continue
debug(DEBUG_SPAM, "soname:", soname)
symbols = set()
extra_flags = []
extra_pre_obj = []
extra_post_obj = []
symbols.update(library_symbols_used[library])
# libc.so.6 needs its soinit.o and sofini.o as well as the pic
if soname in ("libc.so.6", "libc.so.6.1", "libc.so.0.1", "libc.so.0.3"):
# force dso_handle.os to be included, otherwise reduced libc
# may segfault in ptmalloc_init due to undefined weak reference
extra_pre_obj.append(sysroot + libc_extras_dir + "/soinit.o")
extra_post_obj.append(sysroot + libc_extras_dir + "/sofini.o")
symbols.add(ProvidedSymbol('__dso_handle', None, None, True))
map_file = find_pic_map(library)
if map_file:
extra_flags.append("-Wl,--version-script=" + map_file)
# compile in only used symbols
cmd = []
cmd.extend(gcc_options)
cmd.append("-nostdlib -nostartfiles -shared -Wl,-soname=" + soname)
cmd.extend(["-u%s" % a.linker_name() for a in symbols])
cmd.extend(["-o", dest_path + "/" + so_file_name + "-so"])
cmd.extend(extra_pre_obj)
cmd.append(pic_file)
cmd.extend(extra_post_obj)
cmd.extend(extra_flags)
cmd.append("-lgcc")
cmd.extend(["-L%s" % a for a in [dest_path] + [sysroot + b for b in lib_path if sysroot == "" or b not in ("/" + libdir + "/", "/usr/" + libdir + "/")]])
cmd.append(library_depends_gcc_libnames(so_file))
command(target + "gcc", *cmd)
# strip result
command(target + "objcopy", "--strip-unneeded -R .note -R .comment",
dest_path + "/" + so_file_name + "-so",
dest_path + "/" + so_file_name + "-so-stripped")
## DEBUG
debug(DEBUG_VERBOSE, so_file, "\t", `os.stat(so_file)[ST_SIZE]`)
debug(DEBUG_VERBOSE, dest_path + "/" + so_file_name + "-so", "\t",
`os.stat(dest_path + "/" + so_file_name + "-so")[ST_SIZE]`)
debug(DEBUG_VERBOSE, dest_path + "/" + so_file_name + "-so-stripped",
"\t", `os.stat(dest_path + "/" + so_file_name + "-so-stripped")[ST_SIZE]`)
# Finalising libs and cleaning up
for lib in regexpfilter(os.listdir(dest_path), "(.*)-so-stripped$"):
os.rename(dest_path + "/" + lib + "-so-stripped", dest_path + "/" + lib)
for lib in regexpfilter(os.listdir(dest_path), "(.*-so)$"):
os.remove(dest_path + "/" + lib)
# Canonicalize library names.
for lib in sorted(regexpfilter(os.listdir(dest_path), "(.*so[.\d]*)$")):
this_lib_path = dest_path + "/" + lib
if os.path.islink(this_lib_path):
debug(DEBUG_VERBOSE, "Unlinking %s." % lib)
os.remove(this_lib_path)
continue
soname = extract_soname(this_lib_path)
if soname:
debug(DEBUG_VERBOSE, "Moving %s to %s." % (lib, soname))
os.rename(dest_path + "/" + lib, dest_path + "/" + soname)
# Make sure the dynamic linker is present and is executable
# at its correct location (and not duplicated in /lib)
ld_file_name = os.path.basename(ldlib)
ld_path_name = os.path.dirname(ldlib)
ld_full_path = "../" + ldlib
ld_file = find_lib(ld_file_name)
if ld_path_name != "/lib":
if os.access(dest_path + "/" + ld_file_name, os.F_OK):
os.remove(dest_path + "/" + ld_file_name)
if not os.path.exists(dest_path + "/../" + ld_path_name):
os.mkdir(dest_path + "/../" + ld_path_name)
if not os.access(dest_path + "/" + ld_full_path, os.F_OK):
debug(DEBUG_NORMAL, "I: stripping and copying dynamic linker to " + ld_full_path)
command(target + "objcopy", "--strip-unneeded -R .note -R .comment",
ld_file, dest_path + "/" + ld_full_path)
os.chmod(dest_path + "/" + ld_full_path, 0755)
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