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-rwxr-xr-xbfd/load.py93
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()