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Patrick Williamsc124f4f2015-09-15 14:41:29 -05001#!/usr/bin/env python
2#
3# Copyright (c) 2012 Intel Corporation
4#
5# This program is free software; you can redistribute it and/or modify
6# it under the terms of the GNU General Public License version 2 as
7# published by the Free Software Foundation.
8#
9# This program is distributed in the hope that it will be useful,
10# but WITHOUT ANY WARRANTY; without even the implied warranty of
11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12# See the GNU General Public License for more details.
13#
14# You should have received a copy of the GNU General Public License
15# along with this program; if not, write to the Free Software
16# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17#
18# DESCRIPTION
19# This script is called by the SDK installer script. It replaces the dynamic
20# loader path in all binaries and also fixes the SYSDIR paths/lengths and the
21# location of ld.so.cache in the dynamic loader binary
22#
23# AUTHORS
24# Laurentiu Palcu <laurentiu.palcu@intel.com>
25#
26
27import struct
28import sys
29import stat
30import os
31import re
32import errno
33
34if sys.version < '3':
35 def b(x):
36 return x
37else:
38 def b(x):
39 return x.encode(sys.getfilesystemencoding())
40
41old_prefix = re.compile(b("##DEFAULT_INSTALL_DIR##"))
42
43def get_arch():
44 f.seek(0)
45 e_ident =f.read(16)
46 ei_mag0,ei_mag1_3,ei_class = struct.unpack("<B3sB11x", e_ident)
47
48 if (ei_mag0 != 0x7f and ei_mag1_3 != "ELF") or ei_class == 0:
49 return 0
50
51 if ei_class == 1:
52 return 32
53 elif ei_class == 2:
54 return 64
55
56def parse_elf_header():
57 global e_type, e_machine, e_version, e_entry, e_phoff, e_shoff, e_flags,\
58 e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum, e_shstrndx
59
60 f.seek(0)
61 elf_header = f.read(64)
62
63 if arch == 32:
64 # 32bit
65 hdr_fmt = "<HHILLLIHHHHHH"
66 hdr_size = 52
67 else:
68 # 64bit
69 hdr_fmt = "<HHIQQQIHHHHHH"
70 hdr_size = 64
71
72 e_type, e_machine, e_version, e_entry, e_phoff, e_shoff, e_flags,\
73 e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum, e_shstrndx =\
74 struct.unpack(hdr_fmt, elf_header[16:hdr_size])
75
76def change_interpreter(elf_file_name):
77 if arch == 32:
78 ph_fmt = "<IIIIIIII"
79 else:
80 ph_fmt = "<IIQQQQQQ"
81
82 """ look for PT_INTERP section """
83 for i in range(0,e_phnum):
84 f.seek(e_phoff + i * e_phentsize)
85 ph_hdr = f.read(e_phentsize)
86 if arch == 32:
87 # 32bit
88 p_type, p_offset, p_vaddr, p_paddr, p_filesz,\
89 p_memsz, p_flags, p_align = struct.unpack(ph_fmt, ph_hdr)
90 else:
91 # 64bit
92 p_type, p_flags, p_offset, p_vaddr, p_paddr, \
93 p_filesz, p_memsz, p_align = struct.unpack(ph_fmt, ph_hdr)
94
95 """ change interpreter """
96 if p_type == 3:
97 # PT_INTERP section
98 f.seek(p_offset)
99 # External SDKs with mixed pre-compiled binaries should not get
100 # relocated so look for some variant of /lib
101 fname = f.read(11)
102 if fname.startswith(b("/lib/")) or fname.startswith(b("/lib64/")) or \
103 fname.startswith(b("/lib32/")) or fname.startswith(b("/usr/lib32/")) or \
104 fname.startswith(b("/usr/lib32/")) or fname.startswith(b("/usr/lib64/")):
105 break
106 if (len(new_dl_path) >= p_filesz):
107 print("ERROR: could not relocate %s, interp size = %i and %i is needed." \
108 % (elf_file_name, p_memsz, len(new_dl_path) + 1))
109 break
110 dl_path = new_dl_path + b("\0") * (p_filesz - len(new_dl_path))
111 f.seek(p_offset)
112 f.write(dl_path)
113 break
114
115def change_dl_sysdirs():
116 if arch == 32:
117 sh_fmt = "<IIIIIIIIII"
118 else:
119 sh_fmt = "<IIQQQQIIQQ"
120
121 """ read section string table """
122 f.seek(e_shoff + e_shstrndx * e_shentsize)
123 sh_hdr = f.read(e_shentsize)
124 if arch == 32:
125 sh_offset, sh_size = struct.unpack("<16xII16x", sh_hdr)
126 else:
127 sh_offset, sh_size = struct.unpack("<24xQQ24x", sh_hdr)
128
129 f.seek(sh_offset)
130 sh_strtab = f.read(sh_size)
131
132 sysdirs = sysdirs_len = ""
133
134 """ change ld.so.cache path and default libs path for dynamic loader """
135 for i in range(0,e_shnum):
136 f.seek(e_shoff + i * e_shentsize)
137 sh_hdr = f.read(e_shentsize)
138
139 sh_name, sh_type, sh_flags, sh_addr, sh_offset, sh_size, sh_link,\
140 sh_info, sh_addralign, sh_entsize = struct.unpack(sh_fmt, sh_hdr)
141
142 name = sh_strtab[sh_name:sh_strtab.find(b("\0"), sh_name)]
143
144 """ look only into SHT_PROGBITS sections """
145 if sh_type == 1:
146 f.seek(sh_offset)
147 """ default library paths cannot be changed on the fly because """
148 """ the string lengths have to be changed too. """
149 if name == b(".sysdirs"):
150 sysdirs = f.read(sh_size)
151 sysdirs_off = sh_offset
152 sysdirs_sect_size = sh_size
153 elif name == b(".sysdirslen"):
154 sysdirslen = f.read(sh_size)
155 sysdirslen_off = sh_offset
156 elif name == b(".ldsocache"):
157 ldsocache_path = f.read(sh_size)
158 new_ldsocache_path = old_prefix.sub(new_prefix, ldsocache_path)
159 # pad with zeros
160 new_ldsocache_path += b("\0") * (sh_size - len(new_ldsocache_path))
161 # write it back
162 f.seek(sh_offset)
163 f.write(new_ldsocache_path)
164 elif name == b(".gccrelocprefix"):
165 offset = 0
166 while (offset + 4096) <= sh_size:
167 path = f.read(4096)
168 new_path = old_prefix.sub(new_prefix, path)
169 # pad with zeros
170 new_path += b("\0") * (4096 - len(new_path))
171 #print "Changing %s to %s at %s" % (str(path), str(new_path), str(offset))
172 # write it back
173 f.seek(sh_offset + offset)
174 f.write(new_path)
175 offset = offset + 4096
176 if sysdirs != "" and sysdirslen != "":
177 paths = sysdirs.split(b("\0"))
178 sysdirs = b("")
179 sysdirslen = b("")
180 for path in paths:
181 """ exit the loop when we encounter first empty string """
182 if path == b(""):
183 break
184
185 new_path = old_prefix.sub(new_prefix, path)
186 sysdirs += new_path + b("\0")
187
188 if arch == 32:
189 sysdirslen += struct.pack("<L", len(new_path))
190 else:
191 sysdirslen += struct.pack("<Q", len(new_path))
192
193 """ pad with zeros """
194 sysdirs += b("\0") * (sysdirs_sect_size - len(sysdirs))
195
196 """ write the sections back """
197 f.seek(sysdirs_off)
198 f.write(sysdirs)
199 f.seek(sysdirslen_off)
200 f.write(sysdirslen)
201
202# MAIN
203if len(sys.argv) < 4:
204 sys.exit(-1)
205
206# In python > 3, strings may also contain Unicode characters. So, convert
207# them to bytes
208if sys.version_info < (3,):
209 new_prefix = sys.argv[1]
210 new_dl_path = sys.argv[2]
211else:
212 new_prefix = sys.argv[1].encode()
213 new_dl_path = sys.argv[2].encode()
214
215executables_list = sys.argv[3:]
216
217for e in executables_list:
218 perms = os.stat(e)[stat.ST_MODE]
219 if os.access(e, os.W_OK|os.R_OK):
220 perms = None
221 else:
222 os.chmod(e, perms|stat.S_IRWXU)
223
224 try:
225 f = open(e, "r+b")
226 except IOError:
227 exctype, ioex = sys.exc_info()[:2]
228 if ioex.errno == errno.ETXTBSY:
229 print("Could not open %s. File used by another process.\nPlease "\
230 "make sure you exit all processes that might use any SDK "\
231 "binaries." % e)
232 else:
233 print("Could not open %s: %s(%d)" % (e, ioex.strerror, ioex.errno))
234 sys.exit(-1)
235
236 # Save old size and do a size check at the end. Just a safety measure.
237 old_size = os.path.getsize(e)
238 if old_size >= 64:
239 arch = get_arch()
240 if arch:
241 parse_elf_header()
242 change_interpreter(e)
243 change_dl_sysdirs()
244
245 """ change permissions back """
246 if perms:
247 os.chmod(e, perms)
248
249 f.close()
250
251 if old_size != os.path.getsize(e):
252 print("New file size for %s is different. Looks like a relocation error!", e)
253 sys.exit(-1)
254