def _process_offset(offset, ea, next_offset):
"""Process an offset in a __got section."""
# Convert the address containing the offset into an offset in IDA, but continue if it fails.
if not idc.OpOff(ea, 0, 0):
_log(1, 'Could not convert {:#x} into an offset', ea)
# Get the name to which the offset refers.
name = idau.get_ea_name(offset, user=True)
if not name:
_log(3, 'Offset at address {:#x} has target {:#x} without a name', ea,
offset)
return False
# Make sure this isn't an offset to another stub or to a jump function to another stub. See the
# comment in _symbolicate_stub.
if stub.symbol_references_stub(name):
_log(
1,
'Offset at address {:#x} has target {:#x} (name {}) that references a stub',
ea, offset, name)
return False
# Set the new name for the offset.
symbol = next_offset(name)
if symbol is None:
_log(0, 'Could not generate offset symbol for {}: names exhausted',
name)
return False
if not idau.set_ea_name(ea, symbol, auto=True):
_log(2, 'Could not set name {} for offset at {:#x}', symbol, ea)
return False
return True
def _symbolicate_overrides_for_classinfo(classinfo, processed):
"""A recursive function to symbolicate vtable overrides for a class and its superclasses."""
# If we've already been processed, stop.
if classinfo in processed:
return
# First propagate symbol information to our superclass.
if classinfo.superclass:
_symbolicate_overrides_for_classinfo(classinfo.superclass, processed)
# Now symbolicate the superclass.
for _, override, original in class_vtable_overrides(classinfo, methods=True):
# Skip this method if the override already has a name and we can't rename it.
override_name = idau.get_ea_name(override, user=True)
if override_name and not _ok_to_rename_method(override, override_name):
continue
# Skip this method if the original does not have a name or if it's a bad name.
original_name = idau.get_ea_name(original, user=True)
if not original_name or _bad_name_dont_use_as_override(original_name):
continue
# Get the new override name if we substitute for the override class's name.
new_name = _vtable_method_symbol_substitute_class(original_name, classinfo.classname)
if not new_name:
_log(0, 'Could not substitute class {} into method symbol {} for override {:#x}',
classinfo.classname, original_name, override)
continue
# Now that we have the new name, set it.
if override_name:
_log(2, 'Renaming {} -> {}', override_name, new_name)
if not idau.set_ea_name(override, new_name, rename=True):
_log(0, 'Could not set name {} for method {:#x}', new_name, override)
# We're done.
processed.add(classinfo)
def _symbolicate_stub(stub, target, next_stub):
"""Set a symbol for a stub function."""
name = idau.get_ea_name(target, username=True)
if not name:
_log(3, 'Stub {:#x} has target {:#x} without a name', stub, target)
return False
# Sometimes the target of the stub is a thunk in another kext. This is sometimes OK, but makes
# a right mess of things when that thunk is itself a jump function for another stub, and
# especially when there are multiple such jump functions to that stub in that kext.
# Autorenaming of thunks interacts poorly with autonaming of stubs (you get things like
# 'j_TARGET___stub_2_0', which stub_name_target() no longer thinks of as a stub). Thus, if the
# current thing has '__stub_' in it, don't rename. The reason we don't just extract the inner
# stub reference is that these jump functions are really wrappers with different names and
# semantics in the original code, so it's not appropriate for us to cover that up with a stub.
if symbol_references_stub(name):
_log(
1,
'Stub {:#x} has target {:#x} (name {}) that references another stub',
stub, target, name)
return False
symbol = next_stub(name)
if symbol is None:
_log(0, 'Could not generate stub symbol for {}: names exhausted', name)
return False
if not idau.set_ea_name(stub, symbol, auto=True):
_log(2, 'Could not set name {} for stub at {:#x}', symbol, stub)
return False
return True
def add_vtable_symbol(vtable, classname):
"""Add a symbol for the virtual method table at the specified address.
Arguments:
vtable: The address of the virtual method table.
classname: The name of the C++ class with this virtual method table.
Returns:
True if the data was successfully converted into a vtable and the symbol was added.
"""
vtable_symbol = vtable_symbol_for_class(classname)
if not idau.set_ea_name(vtable, vtable_symbol):
_log(0, 'Address {:#x} already has name {} instead of vtable symbol {}'
.format(vtable, idau.get_ea_name(vtable), vtable_symbol))
return False
return True
def add_metaclass_symbol(metaclass, classname):
"""Add a symbol for the OSMetaClass instance at the specified address.
Arguments:
metaclass: The address of the OSMetaClass instance.
classname: The name of the C++ class with this OSMetaClass instance.
Returns:
True if the OSMetaClass instance's symbol was created successfully.
"""
metaclass_symbol = metaclass_symbol_for_class(classname)
if not idau.set_ea_name(metaclass, metaclass_symbol):
_log(0, 'Address {:#x} already has name {} instead of OSMetaClass instance symbol {}'
.format(metaclass, idau.get_ea_name(metaclass), metaclass_symbol))
return False
return True
