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adding check on .init_array section if present #51

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adding check on .init_array section if present #51

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49 changes: 25 additions & 24 deletions librw_x64/loader.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,30 +57,31 @@ def load_functions(self, fnlist):
self.container.add_function(function)

section = self.elffile.get_section_by_name(".init_array")
data = section.data()
# section = self.elffile.get_section_by_name(".fini_array")
# data += section.data()
for e,i in enumerate(range(0, len(data), 8)):
address = data[i:i+8]
addr_int = struct.unpack("<Q", address)[0]
func = self.container.functions.get(addr_int, None)
if func == None:
print(f"ERROR: missed .init_array function symbol at {hex(addr_int)}")
# TODO
# We need to add them to the function list
# we need to "add_function" like right above
min_next_func = 0xffffffffffffffff
for func in self.container.functions:
if func > addr_int:
min_next_func = min(min_next_func, func)
if min_next_func != 0xffffffffffffffff:
sz = min_next_func - addr_int
func_bytes = text_data[addr_int - text_base:addr_int - text_base + sz]
if e == 0:
# skip first initial array and just do ret (problems with _ITM_registerTMClone... begin unlinkable)
self.container.add_function(Function(f"entry_{hex(addr_int)}", addr_int, sz, b"\xc3"))
else:
self.container.add_function(Function(f"entry_{hex(addr_int)}", addr_int, sz, func_bytes))
if hasattr(section, "data"):
data = section.data()
# section = self.elffile.get_section_by_name(".fini_array")
# data += section.data()
for e,i in enumerate(range(0, len(data), 8)):
address = data[i:i+8]
addr_int = struct.unpack("<Q", address)[0]
func = self.container.functions.get(addr_int, None)
if func == None:
print(f"ERROR: missed .init_array function symbol at {hex(addr_int)}")
# TODO
# We need to add them to the function list
# we need to "add_function" like right above
min_next_func = 0xffffffffffffffff
for func in self.container.functions:
if func > addr_int:
min_next_func = min(min_next_func, func)
if min_next_func != 0xffffffffffffffff:
sz = min_next_func - addr_int
func_bytes = text_data[addr_int - text_base:addr_int - text_base + sz]
if e == 0:
# skip first initial array and just do ret (problems with _ITM_registerTMClone... begin unlinkable)
self.container.add_function(Function(f"entry_{hex(addr_int)}", addr_int, sz, b"\xc3"))
else:
self.container.add_function(Function(f"entry_{hex(addr_int)}", addr_int, sz, func_bytes))

# fill gaps
# functions = list(sorted(self.container.functions.items()))
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