diff options
Diffstat (limited to 'bfd/load.py')
| -rwxr-xr-x | bfd/load.py | 126 |
1 files changed, 117 insertions, 9 deletions
diff --git a/bfd/load.py b/bfd/load.py index cb53722..4e85ca7 100755 --- a/bfd/load.py +++ b/bfd/load.py @@ -63,13 +63,14 @@ class CLIArgParser(object): parser.add_argument("--dumpfuncasm", type=str, help="dump a functions assembly code") parser.add_argument("--textasm", action='store_true', help="disassemble the text section", default=False) parser.add_argument("--dynsecents", action='store_true', help="dynamic section entries", default=False) - parser.add_argument("--reladynents", action='store_true', help=".rela.dyn entries", default=False) + parser.add_argument("--reladyn", action='store_true', help=".rela.dyn entries", default=False) + parser.add_argument("--relaplt", action='store_true', help=".rela.plt entries", default=False) self.args = parser.parse_args() if self.args.obj is None: raise Exception("no object file provided. please specify an object with --obj.") -def byte2int(value): - return int.from_bytes(value, byteorder="little", signed=False) +def byte2int(value,sign = False): + return int.from_bytes(value, byteorder="little", signed=sign) def byte2hex(value): return hex(int.from_bytes(value, byteorder="little", signed=False)) @@ -475,14 +476,34 @@ class X86_REL_TYPE: R_386_PC8 = 15 R_386_SIZE32 = 16 +def get_x86_rel_type(val): + if val == X86_REL_TYPE.R_386_NONE: return "R_386_NONE" + elif val == X86_REL_TYPE.R_386_32: return "R_386_32" + elif val == X86_REL_TYPE.R_386_PC32: return "R_386_PC32" + elif val == X86_REL_TYPE.R_386_GOT32: return "R_386_GOT32" + elif val == X86_REL_TYPE.R_386_PLT32: return "R_386_PLT32" + elif val == X86_REL_TYPE.R_386_COPY: return "R_386_COPY" + elif val == X86_REL_TYPE.R_386_GLOB_DAT: return "R_386_GLOB_DAT" + elif val == X86_REL_TYPE.R_386_JMP_SLOT: return "R_386_JMP_SLOT" + elif val == X86_REL_TYPE.R_386_RELATIVE: return "R_386_RELATIVE" + elif val == X86_REL_TYPE.R_386_GOTOFF: return "R_386_GOTOFF" + elif val == X86_REL_TYPE.R_386_GOTPC: return "R_386_GOTPC" + elif val == X86_REL_TYPE.R_386_32PLT: return "R_386_32PLT" + elif val == X86_REL_TYPE.R_386_16: return "R_386_16" + elif val == X86_REL_TYPE.R_386_PC16: return "R_386_PC16" + elif val == X86_REL_TYPE.R_386_8: return "R_386_8" + elif val == X86_REL_TYPE.R_386_PC8: return "R_386_PC8" + elif val == X86_REL_TYPE.R_386_SIZE32: return "R_386_SIZE32" + else: return "UNKNOWN" + class X86_64_REL_TYPE: R_AMD64_NONE = 0 R_AMD64_64 = 1 R_AMD64_PC32 = 2 - R_AMD6_GOT32 = 3 + R_AMD64_GOT32 = 3 R_AMD64_PLT32 = 4 R_AMD64_COPY = 5 - R_AMD64_GLOV_DAT = 6 + R_AMD64_GLOB_DAT = 6 R_AMD64_JUMP_SLOT = 7 R_AMD64_RELATIVE = 8 R_AMD64_GOTPCREL = 9 @@ -498,6 +519,30 @@ class X86_64_REL_TYPE: R_AMD64_SIZE32 = 32 R_AMD64_SIZE64 = 33 +def get_x86_64_rel_type(val): + if val == X86_64_REL_TYPE.R_AMD64_NONE: return "R_386_NONE" + elif val == X86_64_REL_TYPE.R_AMD64_64: return "R_AMD64_64" + elif val == X86_64_REL_TYPE.R_AMD64_PC32: return "R_AMD64_PC32" + elif val == X86_64_REL_TYPE.R_AMD64_GOT32: return "R_AMD64_GOT32" + elif val == X86_64_REL_TYPE.R_AMD64_PLT32: return "R_AMD64_PLT32" + elif val == X86_64_REL_TYPE.R_AMD64_COPY: return "R_AMD64_COPY" + elif val == X86_64_REL_TYPE.R_AMD64_GLOB_DAT: return "R_AMD64_GLOB_DAT" + elif val == X86_64_REL_TYPE.R_AMD64_JUMP_SLOT: return "R_AMD64_JUMP_SLOT" + elif val == X86_64_REL_TYPE.R_AMD64_RELATIVE: return "R_AMD64_RELATIVE" + elif val == X86_64_REL_TYPE.R_AMD64_GOTPCREL: return "R_AMD64_GOTPCREL" + elif val == X86_64_REL_TYPE.R_AMD64_32: return "R_AMD64_32" + elif val == X86_64_REL_TYPE.R_AMD64_32S: return "R_AMD64_32S" + elif val == X86_64_REL_TYPE.R_AMD64_16: return "R_AMD64_16" + elif val == X86_64_REL_TYPE.R_AMD64_PC16: return "R_AMD64_PC16" + elif val == X86_64_REL_TYPE.R_AMD64_8: return "R_AMD64_8" + elif val == X86_64_REL_TYPE.R_AMD64_PC8: return "R_AMD64_PC8" + elif val == X86_64_REL_TYPE.R_AMD64_PC64: return "R_AMD64_PC64" + elif val == X86_64_REL_TYPE.R_AMD64_GOTOFF64: return "R_AMD64_GOTOFF64" + elif val == X86_64_REL_TYPE.R_AMD64_GOTPC32: return "R_AMD64_GOTPC32" + elif val == X86_64_REL_TYPE.R_AMD64_SIZE32: return "R_AMD64_SIZE32" + elif val == X86_64_REL_TYPE.R_AMD64_SIZE64: return "R_AMD64_SIZE64" + else: return "UNKNOWN" + class ELF_ST_BIND: STB_LOCAL = 0 STB_GLOBAL = 1 @@ -669,6 +714,8 @@ class ELF(object): self.dyn_section_ents = [] self.rela_dyn = [] self.rela_dyn_ents = [] + self.rela_plt = [] + self.rela_plt_ents = [] def init(self, size): self.size = size @@ -703,7 +750,9 @@ class ELF(object): self.pop_text_section() self.get_ph_dyn_entries() self.pop_dynamic_entries(".dynamic", self.dyn_section_ents) - self.pop_dynamic_entries(".rela.dyn", self.rela_dyn_ents) + self.pop_rela(".rela.plt", self.rela_plt, self.rela_plt_ents) + self.pop_rela(".rela.dyn", self.rela_dyn, self.rela_dyn_ents) + #self.pop_rel() def read_ELF_H(self, size): self.elfhdr.ei_mag = self.so.read(4) @@ -1027,14 +1076,30 @@ class ELF(object): print(line) def dump_dyn_sec_ents(self, who): - header = ["type_string", "tag", "value"] + header = ["type_string", "tag", "value", "value(hex)"] tag_string_list = [entry["type_string"] for entry in who] tag_list = [entry["tag"] for entry in who] value_list = [entry["value"] for entry in who] - lines = ffs(2, header, True, tag_string_list, tag_list, value_list) + value_list_hex = [hex(entry["value"]) for entry in who] + lines = ffs(2, header, True, tag_string_list, tag_list, value_list, value_list_hex) for line in lines: print(line) + def dump_rela(self, to_dump): + header = ["r_offset", "r_info", "r_addend"] + r_offset_list = [entry["r_offset"] for entry in to_dump] + r_info_list = [entry["r_info"] for entry in to_dump] + addend_list = [entry["r_addend"] for entry in to_dump] + lines = ffs(2, header, True, r_offset_list, r_info_list, addend_list) + for line in lines: print(line) + + def dump_rel(self, to_dump): + header = ["r_offset", "r_info"] + r_offset_list = [entry["r_offset"] for entry in to_dump] + r_info_list = [entry["r_info"] for entry in to_dump] + lines = ffs(2, header, True, r_offset_list, r_info_list) + for line in lines: print(line) + def get_st_entry_symbol_string(self, index, section_name): symbol = [] for i in range(0, byte2int(self.elfhdr.e_shnum)): @@ -1105,6 +1170,48 @@ class ELF(object): struct_to_pop.append(dummy) dummy = {} + def pop_rela(self, section_name, section_whole, to_pop): + size = int() + entsize = int() + dummy = {} + step = int() + if self.size == 64: step = 8 + if self.size == 32: step = 4 + for section in self.shhdr: + name = self.read_section_name(byte2int(section.sh_name)) + if name == section_name: + self.so.seek(byte2int(section.sh_offset)) + section_whole = self.so.read(byte2int(section.sh_size)) + size = byte2int(section.sh_size) + entsize = byte2int(section.sh_entsize) + for i in range(0, int(size/entsize)): + dummy["r_offset"] = byte2int(section_whole[i*entsize:i*entsize+step]) + dummy["r_info"] = byte2int(section_whole[i*entsize+step:i*entsize+(step*2)]) + dummy["r_addend"] = byte2int(section_whole[i*entsize+(step*2):i*entsize+(step*3)], sign=True) + to_pop.append(dummy) + dummy = {} + + def pop_rel(self, section_name, section_whole, to_pop): + size = int() + entsize = int() + dummy = {} + step = int() + if self.size == 64: step = 8 + if self.size == 32: step = 4 + for section in self.shhdr: + name = self.read_section_name(byte2int(section.sh_name)) + if name == section_name: + self.so.seek(byte2int(section.sh_offset)) + section_whole = self.so.read(byte2int(section.sh_size)) + size = byte2int(section.sh_size) + entsize = byte2int(section.sh_entsize) + for i in range(0, int(size/entsize)): + dummy["r_offset"] = byte2int(section_whole[i*entsize:i*entsize+step]) + dummy["r_info"] = byte2int(section_whole[i*entsize+step:i*entsize+(step*2)]) + to_pop.append(dummy) + dummy = {} + + class obj_loader(): def __init__(self, bytes): self.memory = bytes() @@ -1266,7 +1373,8 @@ def premain(argparser): for i in md.disasm(bytes(elf.text_section), 0x0): print(hex(i.address).ljust(7), i.mnemonic.ljust(7), i.op_str) elif argparser.args.dynsecents: elf.dump_dyn_sec_ents(elf.dyn_section_ents) - elif argparser.args.reladynents: elf.dump_dyn_sec_ents(elf.rela_dyn_ents) + elif argparser.args.reladyn: elf.dump_rela(elf.rela_dyn_ents) + elif argparser.args.relaplt: elf.dump_rela(elf.rela_plt_ents) else: print("why even bother if you were not gonna type anythng decent in?") def main(): |