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#-------------------------------------------------------------------------------
# elftools: elf/segments.py
#
# ELF segments
#
# Eli Bendersky (eliben@gmail.com)
# This code is in the public domain
#-------------------------------------------------------------------------------
from ..construct import CString
from ..common.utils import struct_parse
from .constants import SH_FLAGS
from .notes import iter_notes
class Segment(object):
def __init__(self, header, stream):
self.header = header
self.stream = stream
def data(self):
""" The segment data from the file.
"""
self.stream.seek(self['p_offset'])
return self.stream.read(self['p_filesz'])
def __getitem__(self, name):
""" Implement dict-like access to header entries
"""
return self.header[name]
def section_in_segment(self, section):
""" Is the given section contained in this segment?
Note: this tries to reproduce the intricate rules of the
ELF_SECTION_IN_SEGMENT_STRICT macro of the header
elf/include/internal.h in the source of binutils.
"""
# Only the 'strict' checks from ELF_SECTION_IN_SEGMENT_1 are included
segtype = self['p_type']
sectype = section['sh_type']
secflags = section['sh_flags']
# Only PT_LOAD, PT_GNU_RELRO and PT_TLS segments can contain SHF_TLS
# sections
if ( secflags & SH_FLAGS.SHF_TLS and
segtype in ('PT_TLS', 'PT_GNU_RELRO', 'PT_LOAD')):
pass
# PT_TLS segment contains only SHF_TLS sections, PT_PHDR no sections
# at all
elif ( (secflags & SH_FLAGS.SHF_TLS) == 0 and
segtype not in ('PT_TLS', 'PT_PHDR')):
pass
else:
return False
# PT_LOAD and similar segments only have SHF_ALLOC sections.
if ( (secflags & SH_FLAGS.SHF_ALLOC) == 0 and
segtype in ('PT_LOAD', 'PT_DYNAMIC', 'PT_GNU_EH_FRAME',
'PT_GNU_RELRO', 'PT_GNU_STACK')):
return False
# In ELF_SECTION_IN_SEGMENT_STRICT the flag check_vma is on, so if
# this is an alloc section, check whether its VMA is in bounds.
if secflags & SH_FLAGS.SHF_ALLOC:
secaddr = section['sh_addr']
vaddr = self['p_vaddr']
# This checks that the section is wholly contained in the segment.
# The third condition is the 'strict' one - an empty section will
# not match at the very end of the segment (unless the segment is
# also zero size, which is handled by the second condition).
if not (secaddr >= vaddr and
secaddr - vaddr + section['sh_size'] <= self['p_memsz'] and
secaddr - vaddr <= self['p_memsz'] - 1):
return False
# If we've come this far and it's a NOBITS section, it's in the segment
if sectype == 'SHT_NOBITS':
return True
secoffset = section['sh_offset']
poffset = self['p_offset']
# Same logic as with secaddr vs. vaddr checks above, just on offsets in
# the file
return (secoffset >= poffset and
secoffset - poffset + section['sh_size'] <= self['p_filesz'] and
secoffset - poffset <= self['p_filesz'] - 1)
class InterpSegment(Segment):
""" INTERP segment. Knows how to obtain the path to the interpreter used
for this ELF file.
"""
def __init__(self, header, stream):
super(InterpSegment, self).__init__(header, stream)
def get_interp_name(self):
""" Obtain the interpreter path used for this ELF file.
"""
path_offset = self['p_offset']
return struct_parse(
CString('', encoding='utf-8'),
self.stream,
stream_pos=path_offset)
class NoteSegment(Segment):
""" NOTE segment. Knows how to parse notes.
"""
def __init__(self, header, stream, elffile):
super(NoteSegment, self).__init__(header, stream)
self.elffile = elffile
def iter_notes(self):
""" Yield all the notes in the segment. Each result is a dictionary-
like object with "n_name", "n_type", and "n_desc" fields, amongst
others.
"""
return iter_notes(self.elffile, self['p_offset'], self['p_filesz'])