mLinux 6

1 files changed, 264 insertions, 0 deletions

diff --git a/scripts/relocate_sdk.py b/scripts/relocate_sdk.py
new file mode 100755
index 0000000..99fca86
--- /dev/null
+++ b/scripts/relocate_sdk.py
@@ -0,0 +1,264 @@
+#!/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
+import errno
+
+if sys.version < '3':
+    def b(x):
+        return x
+else:
+    def b(x):
+        return x.encode(sys.getfilesystemencoding())
+
+old_prefix = re.compile(b("##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_fmt = "<HHILLLIHHHHHH"
+        hdr_size = 52
+    else:
+        # 64bit
+        hdr_fmt = "<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 =\
+        struct.unpack(hdr_fmt, elf_header[16:hdr_size])
+
+def change_interpreter(elf_file_name):
+    if arch == 32:
+        ph_fmt = "<IIIIIIII"
+    else:
+        ph_fmt = "<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 = struct.unpack(ph_fmt, ph_hdr)
+        else:
+            # 64bit
+            p_type, p_flags, p_offset, p_vaddr, p_paddr, \
+            p_filesz, p_memsz, p_align = struct.unpack(ph_fmt, ph_hdr)
+
+        """ change interpreter """
+        if p_type == 3:
+            # PT_INTERP section
+            f.seek(p_offset)
+            # External SDKs with mixed pre-compiled binaries should not get
+            # relocated so look for some variant of /lib
+            fname = f.read(11)
+            if fname.startswith(b("/lib/")) or fname.startswith(b("/lib64/")) or \
+               fname.startswith(b("/lib32/")) or fname.startswith(b("/usr/lib32/")) or \
+               fname.startswith(b("/usr/lib32/")) or fname.startswith(b("/usr/lib64/")):
+                break
+            if (len(new_dl_path) >= p_filesz):
+                print("ERROR: could not relocate %s, interp size = %i and %i is needed." \
+                    % (elf_file_name, p_memsz, len(new_dl_path) + 1))
+                break
+            dl_path = new_dl_path + b("\0") * (p_filesz - len(new_dl_path))
+            f.seek(p_offset)
+            f.write(dl_path)
+            break
+
+def change_dl_sysdirs(elf_file_name):
+    if arch == 32:
+        sh_fmt = "<IIIIIIIIII"
+    else:
+        sh_fmt = "<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 = struct.unpack(sh_fmt, sh_hdr)
+
+        name = sh_strtab[sh_name:sh_strtab.find(b("\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 == b(".sysdirs"):
+                sysdirs = f.read(sh_size)
+                sysdirs_off = sh_offset
+                sysdirs_sect_size = sh_size
+            elif name == b(".sysdirslen"):
+                sysdirslen = f.read(sh_size)
+                sysdirslen_off = sh_offset
+            elif name == b(".ldsocache"):
+                ldsocache_path = f.read(sh_size)
+                new_ldsocache_path = old_prefix.sub(new_prefix, ldsocache_path)
+                new_ldsocache_path = new_ldsocache_path.rstrip(b("\0"))
+                if (len(new_ldsocache_path) >= sh_size):
+                    print("ERROR: could not relocate %s, .ldsocache section size = %i and %i is needed." \
+                    % (elf_file_name, sh_size, len(new_ldsocache_path)))
+                    sys.exit(-1)
+                # pad with zeros
+                new_ldsocache_path += b("\0") * (sh_size - len(new_ldsocache_path))
+                # write it back
+                f.seek(sh_offset)
+                f.write(new_ldsocache_path)
+            elif name == b(".gccrelocprefix"):
+                offset = 0
+                while (offset + 4096) <= sh_size:
+                    path = f.read(4096)
+                    new_path = old_prefix.sub(new_prefix, path)
+                    new_path = new_path.rstrip(b("\0"))
+                    if (len(new_path) >= 4096):
+                        print("ERROR: could not relocate %s, max path size = 4096 and %i is needed." \
+                        % (elf_file_name, len(new_path)))
+                        sys.exit(-1)
+                    # pad with zeros
+                    new_path += b("\0") * (4096 - len(new_path))
+                    #print "Changing %s to %s at %s" % (str(path), str(new_path), str(offset))
+                    # write it back
+                    f.seek(sh_offset + offset)
+                    f.write(new_path)
+                    offset = offset + 4096
+    if sysdirs != "" and sysdirslen != "":
+        paths = sysdirs.split(b("\0"))
+        sysdirs = b("")
+        sysdirslen = b("")
+        for path in paths:
+            """ exit the loop when we encounter first empty string """
+            if path == b(""):
+                break
+
+            new_path = old_prefix.sub(new_prefix, path)
+            sysdirs += new_path + b("\0")
+
+            if arch == 32:
+                sysdirslen += struct.pack("<L", len(new_path))
+            else:
+                sysdirslen += struct.pack("<Q", len(new_path))
+
+        """ pad with zeros """
+        sysdirs += b("\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:
+    sys.exit(-1)
+
+# In python > 3, strings may also contain Unicode characters. So, convert
+# them to bytes
+if sys.version_info < (3,):
+    new_prefix = sys.argv[1]
+    new_dl_path = sys.argv[2]
+else:
+    new_prefix = sys.argv[1].encode()
+    new_dl_path = sys.argv[2].encode()
+
+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)
+
+    try:
+        f = open(e, "r+b")
+    except IOError:
+        exctype, ioex = sys.exc_info()[:2]
+        if ioex.errno == errno.ETXTBSY:
+            print("Could not open %s. File used by another process.\nPlease "\
+                  "make sure you exit all processes that might use any SDK "\
+                  "binaries." % e)
+        else:
+            print("Could not open %s: %s(%d)" % (e, ioex.strerror, ioex.errno))
+        sys.exit(-1)
+
+    # Save old size and do a size check at the end. Just a safety measure.
+    old_size = os.path.getsize(e)
+    if old_size >= 64:
+        arch = get_arch()
+        if arch:
+            parse_elf_header()
+            change_interpreter(e)
+            change_dl_sysdirs(e)
+
+    """ change permissions back """
+    if perms:
+        os.chmod(e, perms)
+
+    f.close()
+
+    if old_size != os.path.getsize(e):
+        print("New file size for %s is different. Looks like a relocation error!", e)
+        sys.exit(-1)
+