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scripts: add script for relocating the SDK 

This script will be embedded in the SDK tarball and will be called by
the SDK installer. It replaces the interpreter path in all binaries and
it also changes the ld.so.cache and SYSDIRS in dynamic loader.

(From OE-Core rev: 3d366f4953962566f33a3d77d65ed0bd2c48f922)

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Laurentiu Palcu 2012-07-31 11:49:35 +03:00 committed by Richard Purdie
parent 77973e3004
commit 749b8a52c6
1 changed files with 200 additions and 0 deletions
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scripts/relocate_sdk.py Executable file
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#!/usr/bin/env python
#
# Copyright (c) 2012 Intel Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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
#
# DESCRIPTION
# This script is called by the SDK installer script. It replaces the dynamic
# loader path in all binaries and also fixes the SYSDIR paths/lengths and the
# location of ld.so.cache in the dynamic loader binary
#
# AUTHORS
# Laurentiu Palcu <laurentiu.palcu@intel.com>
#
import struct
import sys
import stat
import os
import re
old_prefix = re.compile("##DEFAULT_INSTALL_DIR##")
def get_arch():
f.seek(0)
e_ident =f.read(16)
ei_mag0,ei_mag1_3,ei_class = struct.unpack("<B3sB11x", e_ident)
if (ei_mag0 != 0x7f and ei_mag1_3 != "ELF") or ei_class == 0:
return 0
if ei_class == 1:
return 32
elif ei_class == 2:
return 64
def parse_elf_header():
global e_type, e_machine, e_version, e_entry, e_phoff, e_shoff, e_flags,\
e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum, e_shstrndx
f.seek(0)
elf_header = f.read(64)
if arch == 32:
# 32bit
hdr_struct = struct.Struct("<HHILLLIHHHHHH")
hdr_size = 52
else:
# 64bit
hdr_struct = struct.Struct("<HHIQQQIHHHHHH")
hdr_size = 64
e_type, e_machine, e_version, e_entry, e_phoff, e_shoff, e_flags,\
e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum, e_shstrndx =\
hdr_struct.unpack(elf_header[16:hdr_size])
def change_interpreter():
if arch == 32:
ph_struct = struct.Struct("<IIIIIIII")
else:
ph_struct = struct.Struct("<IIQQQQQQ")
""" look for PT_INTERP section """
for i in range(0,e_phnum):
f.seek(e_phoff + i * e_phentsize)
ph_hdr = f.read(e_phentsize)
if arch == 32:
# 32bit
p_type, p_offset, p_vaddr, p_paddr, p_filesz,\
p_memsz, p_flags, p_align = ph_struct.unpack(ph_hdr)
else:
# 64bit
p_type, p_flags, p_offset, p_vaddr, p_paddr, \
p_filesz, p_memsz, p_align = ph_struct.unpack(ph_hdr)
""" change interpreter """
if p_type == 3:
# PT_INTERP section
f.seek(p_offset)
dl_path = new_dl_path + "\0" * (e_phentsize - len(new_dl_path))
f.write(new_dl_path)
break
def change_dl_sysdirs():
if arch == 32:
sh_struct = struct.Struct("<IIIIIIIIII")
else:
sh_struct = struct.Struct("<IIQQQQIIQQ")
""" read section string table """
f.seek(e_shoff + e_shstrndx * e_shentsize)
sh_hdr = f.read(e_shentsize)
if arch == 32:
sh_offset, sh_size = struct.unpack("<16xII16x", sh_hdr)
else:
sh_offset, sh_size = struct.unpack("<24xQQ24x", sh_hdr)
f.seek(sh_offset)
sh_strtab = f.read(sh_size)
sysdirs = sysdirs_len = ""
""" change ld.so.cache path and default libs path for dynamic loader """
for i in range(0,e_shnum):
f.seek(e_shoff + i * e_shentsize)
sh_hdr = f.read(e_shentsize)
sh_name, sh_type, sh_flags, sh_addr, sh_offset, sh_size, sh_link,\
sh_info, sh_addralign, sh_entsize = sh_struct.unpack(sh_hdr)
name = sh_strtab[sh_name:sh_strtab.find("\0", sh_name)]
""" look only into SHT_PROGBITS sections """
if sh_type == 1:
f.seek(sh_offset)
""" default library paths cannot be changed on the fly because """
""" the string lengths have to be changed too. """
if name == ".sysdirs":
sysdirs = f.read(sh_size)
sysdirs_off = sh_offset
sysdirs_sect_size = sh_size
elif name == ".sysdirslen":
sysdirslen = f.read(sh_size)
sysdirslen_off = sh_offset
elif name == ".ldsocache":
ldsocache_path = f.read(sh_size)
new_ldsocache_path = old_prefix.sub(new_prefix, ldsocache_path)
# pad with zeros
new_ldsocache_path += "\0" * (sh_size - len(new_ldsocache_path))
# write it back
f.seek(sh_offset)
f.write(new_ldsocache_path)
if sysdirs != "" and sysdirslen != "":
paths = sysdirs.split("\0")
sysdirs = ""
sysdirslen = ""
for path in paths:
""" exit the loop when we encounter first empty string """
if path == "":
break
new_path = old_prefix.sub(new_prefix, path)
sysdirs += new_path + "\0"
if arch == 32:
sysdirslen += struct.pack("<L", len(new_path))
else:
sysdirslen += struct.pack("<Q", len(new_path))
""" pad with zeros """
sysdirs += "\0" * (sysdirs_sect_size - len(sysdirs))
""" write the sections back """
f.seek(sysdirs_off)
f.write(sysdirs)
f.seek(sysdirslen_off)
f.write(sysdirslen)
# MAIN
if len(sys.argv) < 4:
exit(1)
new_prefix = sys.argv[1]
new_dl_path = sys.argv[2]
executables_list = sys.argv[3:]
for e in executables_list:
perms = os.stat(e)[stat.ST_MODE]
if os.access(e, os.W_OK|os.R_OK):
perms = None
else:
os.chmod(e, perms|stat.S_IRWXU)
f = open(e, "r+b")
arch = get_arch()
if arch:
parse_elf_header()
change_interpreter()
change_dl_sysdirs()
""" change permissions back """
if perms:
os.chmod(e, perms)
f.close()