diff options
Diffstat (limited to 'bfd')
| -rwxr-xr-x | bfd/load.py | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/bfd/load.py b/bfd/load.py index 86d66d4..cb53722 100755 --- a/bfd/load.py +++ b/bfd/load.py @@ -61,6 +61,9 @@ class CLIArgParser(object): parser.add_argument("--section", type=str, help="dump a section") parser.add_argument("--dumpfunc", type=str, help="dump a functions machine code") 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) self.args = parser.parse_args() if self.args.obj is None: raise Exception("no object file provided. please specify an object with --obj.") @@ -453,6 +456,48 @@ def get_ph_dynamic_ent_tag_type(value): else: return str(value) #else: return "UNKNOWN" +class X86_REL_TYPE: + R_386_NONE = 0 + R_386_32 = 1 + R_386_PC32 = 2 + R_386_GOT32 = 3 + R_386_PLT32 = 4 + R_386_COPY = 5 + R_386_GLOB_DAT = 6 + R_386_JMP_SLOT = 7 + R_386_RELATIVE = 8 + R_386_GOTOFF = 9 + R_386_GOTPC = 10 + R_386_32PLT = 11 + R_386_16 = 12 + R_386_PC16 = 13 + R_386_8 = 14 + R_386_PC8 = 15 + R_386_SIZE32 = 16 + +class X86_64_REL_TYPE: + R_AMD64_NONE = 0 + R_AMD64_64 = 1 + R_AMD64_PC32 = 2 + R_AMD6_GOT32 = 3 + R_AMD64_PLT32 = 4 + R_AMD64_COPY = 5 + R_AMD64_GLOV_DAT = 6 + R_AMD64_JUMP_SLOT = 7 + R_AMD64_RELATIVE = 8 + R_AMD64_GOTPCREL = 9 + R_AMD64_32 = 10 + R_AMD64_32S = 11 + R_AMD64_16 = 12 + R_AMD64_PC16 = 13 + R_AMD64_8 = 14 + R_AMD64_PC8 = 15 + R_AMD64_PC64 = 24 + R_AMD64_GOTOFF64 = 25 + R_AMD64_GOTPC32 = 26 + R_AMD64_SIZE32 = 32 + R_AMD64_SIZE64 = 33 + class ELF_ST_BIND: STB_LOCAL = 0 STB_GLOBAL = 1 @@ -620,6 +665,10 @@ class ELF(object): self.text_section = [] self.dlpath = str() self.ph_dyn_ent = [] + self.dyn_section = [] + self.dyn_section_ents = [] + self.rela_dyn = [] + self.rela_dyn_ents = [] def init(self, size): self.size = size @@ -653,6 +702,8 @@ class ELF(object): self.pop_data_section() 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) def read_ELF_H(self, size): self.elfhdr.ei_mag = self.so.read(4) @@ -975,6 +1026,15 @@ class ELF(object): for line in lines: print(line) + def dump_dyn_sec_ents(self, who): + header = ["type_string", "tag", "value"] + 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) + 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)): @@ -1019,6 +1079,32 @@ class ELF(object): self.so.seek(byte2int(section.sh_offset)) self.text_section = self.so.read(byte2int(section.sh_size)) + def pop_dynamic_entries(self, section_name, struct_to_pop): + 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)) + self.dyn_section = self.so.read(byte2int(section.sh_size)) + length = int(len(self.dyn_section)) + tag_type = int() + type_string = str() + value = int() + dummy = {} + jmp_val = int() + if self.size == 64: jmp_val = 8 + elif self.size == 32: jmp_val = 4 + else: jmp_val = 8; print("self.size is not set for class elf.going with 8 as a default.") + for offset in range(0, length, jmp_val*2): + tag_type = byte2int(self.dyn_section[offset:offset+jmp_val]) + dummy["tag"] = tag_type + value = byte2int(self.dyn_section[offset+jmp_val:offset+(jmp_val*2)]) + dummy["value"] = value + type_string = get_ph_dynamic_ent_tag_type(tag_type) + dummy["type_string"] = type_string + type_string = str() + struct_to_pop.append(dummy) + dummy = {} + class obj_loader(): def __init__(self, bytes): self.memory = bytes() @@ -1175,6 +1261,13 @@ def premain(argparser): for i in md.disasm(bytes(code), 0x0): print(hex(i.address).ljust(7), i.mnemonic.ljust(7), i.op_str) elif argparser.args.phdynent: elf.dump_ph_dyn_entries() + elif argparser.args.textasm: + md = Cs(CS_ARCH_X86, CS_MODE_64) + 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) + else: print("why even bother if you were not gonna type anythng decent in?") def main(): argparser = CLIArgParser() |