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Diffstat (limited to 'scripts/relocate_sdk.py')
| -rwxr-xr-x | scripts/relocate_sdk.py | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/scripts/relocate_sdk.py b/scripts/relocate_sdk.py new file mode 100755 index 0000000000..b247e65ce3 --- /dev/null +++ b/scripts/relocate_sdk.py @@ -0,0 +1,200 @@ +#!/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() + |