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3eb70c067c
There are two cases of corruption that the relocate_sdk.py was not correctly dealing with. 1) SDK Extras should be left alone Extra external binaries included in an SDK that were linked against the host's version of /usr/lib/ld-so.so should not get a relocation applied. In the case that was discovered these were LSB compliant binaries that already worked on many hosts. 2) If the interp section is too small generate an error In the case of the qemu user code, it was using its own .ld file to link the executables which overrides the default in the nativesdk binutils. This generated host executables which had a interp section that was too small to relocate. Now the relocate_sdk.py will print an error and continue on such that the error can be fixed by a developer without having to do the difficult task of debugging why it is crashing or not loading correctly. (From OE-Core rev: 3752a9c6d772b39bbe04d62ef4d3527b4c7198c1) Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
220 lines
7.0 KiB
Python
Executable File
220 lines
7.0 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# Copyright (c) 2012 Intel Corporation
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# DESCRIPTION
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# This script is called by the SDK installer script. It replaces the dynamic
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# loader path in all binaries and also fixes the SYSDIR paths/lengths and the
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# location of ld.so.cache in the dynamic loader binary
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#
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# AUTHORS
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# Laurentiu Palcu <laurentiu.palcu@intel.com>
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#
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import struct
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import sys
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import stat
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import os
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import re
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import errno
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old_prefix = re.compile("##DEFAULT_INSTALL_DIR##")
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def get_arch():
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f.seek(0)
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e_ident =f.read(16)
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ei_mag0,ei_mag1_3,ei_class = struct.unpack("<B3sB11x", e_ident)
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if (ei_mag0 != 0x7f and ei_mag1_3 != "ELF") or ei_class == 0:
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return 0
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if ei_class == 1:
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return 32
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elif ei_class == 2:
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return 64
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def parse_elf_header():
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global e_type, e_machine, e_version, e_entry, e_phoff, e_shoff, e_flags,\
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e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum, e_shstrndx
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f.seek(0)
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elf_header = f.read(64)
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if arch == 32:
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# 32bit
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hdr_struct = struct.Struct("<HHILLLIHHHHHH")
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hdr_size = 52
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else:
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# 64bit
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hdr_struct = struct.Struct("<HHIQQQIHHHHHH")
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hdr_size = 64
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e_type, e_machine, e_version, e_entry, e_phoff, e_shoff, e_flags,\
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e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum, e_shstrndx =\
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hdr_struct.unpack(elf_header[16:hdr_size])
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def change_interpreter(elf_file_name):
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if arch == 32:
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ph_struct = struct.Struct("<IIIIIIII")
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else:
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ph_struct = struct.Struct("<IIQQQQQQ")
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""" look for PT_INTERP section """
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for i in range(0,e_phnum):
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f.seek(e_phoff + i * e_phentsize)
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ph_hdr = f.read(e_phentsize)
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if arch == 32:
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# 32bit
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p_type, p_offset, p_vaddr, p_paddr, p_filesz,\
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p_memsz, p_flags, p_align = ph_struct.unpack(ph_hdr)
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else:
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# 64bit
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p_type, p_flags, p_offset, p_vaddr, p_paddr, \
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p_filesz, p_memsz, p_align = ph_struct.unpack(ph_hdr)
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""" change interpreter """
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if p_type == 3:
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# PT_INTERP section
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f.seek(p_offset)
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# External SDKs with mixed pre-compiled binaries should not get
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# relocated so look for some variant of /lib
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fname = f.read(11)
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if fname.startswith("/lib/") or fname.startswith("/lib64/") or fname.startswith("/lib32/") or fname.startswith("/usr/lib32/") or fname.startswith("/usr/lib32/") or fname.startswith("/usr/lib64/"):
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break
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if (len(new_dl_path) >= p_filesz):
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print "ERROR: could not relocate %s, interp size = %i and %i is needed." % (elf_file_name, p_memsz, len(new_dl_path) + 1)
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break
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dl_path = new_dl_path + "\0" * (p_filesz - len(new_dl_path))
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f.seek(p_offset)
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f.write(dl_path)
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break
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def change_dl_sysdirs():
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if arch == 32:
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sh_struct = struct.Struct("<IIIIIIIIII")
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else:
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sh_struct = struct.Struct("<IIQQQQIIQQ")
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""" read section string table """
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f.seek(e_shoff + e_shstrndx * e_shentsize)
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sh_hdr = f.read(e_shentsize)
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if arch == 32:
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sh_offset, sh_size = struct.unpack("<16xII16x", sh_hdr)
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else:
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sh_offset, sh_size = struct.unpack("<24xQQ24x", sh_hdr)
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f.seek(sh_offset)
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sh_strtab = f.read(sh_size)
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sysdirs = sysdirs_len = ""
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""" change ld.so.cache path and default libs path for dynamic loader """
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for i in range(0,e_shnum):
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f.seek(e_shoff + i * e_shentsize)
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sh_hdr = f.read(e_shentsize)
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sh_name, sh_type, sh_flags, sh_addr, sh_offset, sh_size, sh_link,\
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sh_info, sh_addralign, sh_entsize = sh_struct.unpack(sh_hdr)
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name = sh_strtab[sh_name:sh_strtab.find("\0", sh_name)]
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""" look only into SHT_PROGBITS sections """
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if sh_type == 1:
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f.seek(sh_offset)
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""" default library paths cannot be changed on the fly because """
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""" the string lengths have to be changed too. """
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if name == ".sysdirs":
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sysdirs = f.read(sh_size)
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sysdirs_off = sh_offset
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sysdirs_sect_size = sh_size
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elif name == ".sysdirslen":
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sysdirslen = f.read(sh_size)
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sysdirslen_off = sh_offset
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elif name == ".ldsocache":
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ldsocache_path = f.read(sh_size)
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new_ldsocache_path = old_prefix.sub(new_prefix, ldsocache_path)
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# pad with zeros
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new_ldsocache_path += "\0" * (sh_size - len(new_ldsocache_path))
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# write it back
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f.seek(sh_offset)
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f.write(new_ldsocache_path)
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if sysdirs != "" and sysdirslen != "":
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paths = sysdirs.split("\0")
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sysdirs = ""
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sysdirslen = ""
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for path in paths:
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""" exit the loop when we encounter first empty string """
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if path == "":
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break
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new_path = old_prefix.sub(new_prefix, path)
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sysdirs += new_path + "\0"
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if arch == 32:
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sysdirslen += struct.pack("<L", len(new_path))
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else:
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sysdirslen += struct.pack("<Q", len(new_path))
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""" pad with zeros """
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sysdirs += "\0" * (sysdirs_sect_size - len(sysdirs))
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""" write the sections back """
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f.seek(sysdirs_off)
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f.write(sysdirs)
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f.seek(sysdirslen_off)
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f.write(sysdirslen)
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# MAIN
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if len(sys.argv) < 4:
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exit(-1)
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new_prefix = sys.argv[1]
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new_dl_path = sys.argv[2]
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executables_list = sys.argv[3:]
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for e in executables_list:
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perms = os.stat(e)[stat.ST_MODE]
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if os.access(e, os.W_OK|os.R_OK):
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perms = None
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else:
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os.chmod(e, perms|stat.S_IRWXU)
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try:
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f = open(e, "r+b")
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except IOError as ioex:
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if ioex.errno == errno.ETXTBSY:
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print("Could not open %s. File used by another process.\nPlease "\
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"make sure you exit all processes that might use any SDK "\
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"binaries." % e)
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else:
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print("Could not open %s: %s(%d)" % (e, ioex.strerror, ioex.errno))
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exit(-1)
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arch = get_arch()
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if arch:
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parse_elf_header()
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change_interpreter(e)
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change_dl_sysdirs()
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""" change permissions back """
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if perms:
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os.chmod(e, perms)
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f.close()
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