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fix relocation 1

This commit is contained in:
WitherOrNot 2023-08-15 15:21:16 -04:00
parent bb662279d8
commit d785262845
1 changed files with 6 additions and 6 deletions
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12
obfu_block.py
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@ -131,8 +131,8 @@ for target in range(num_obd):
obfu_code_table[addr] = (index, val1, val2, val3, unk3) obfu_code_table[addr] = (index, val1, val2, val3, unk3)
def decrypt_code(ecstart): def decrypt_code(ecstart, start_offset=0):
print("DECRYPTING CODE @ " + hex(ecstart)) print("DECRYPTING CODE @ " + hex(ecstart) + " OFFSET " + hex(start_offset))
ecstart_offset = ecstart - image_start ecstart_offset = ecstart - image_start
index, val1, val2, val3, unk3 = obfu_code_table[ecstart] index, val1, val2, val3, unk3 = obfu_code_table[ecstart]
@ -242,7 +242,7 @@ def decrypt_code(ecstart):
if ((private_relocs[index] >> 30) & 3) == 2 and offset != 0: if ((private_relocs[index] >> 30) & 3) == 2 and offset != 0:
print(f"RELOC @ OFFSET {hex(addr - ecstart_offset)} +{hex(offset)}") print(f"RELOC @ OFFSET {hex(addr - ecstart_offset)} +{hex(offset)}")
val = array_read_int(dec_bytes, addr - ecstart_offset) val = array_read_int(dec_bytes, addr - ecstart_offset)
val = (val + offset) % (1 << 32) val = (val + offset - start_offset) % (1 << 32)
dec_bytes = array_write_int(dec_bytes, addr - ecstart_offset, val) dec_bytes = array_write_int(dec_bytes, addr - ecstart_offset, val)
print(dec_bytes) print(dec_bytes)
@ -250,7 +250,7 @@ def decrypt_code(ecstart):
dec_bytes = bytes(dec_bytes) dec_bytes = bytes(dec_bytes)
for instr in md.disasm(dec_bytes, 0): for instr in md.disasm(dec_bytes, start_offset):
print(instr) print(instr)
return dec_bytes return dec_bytes
@ -287,8 +287,8 @@ def deobfu_func(ecstart):
code_out = b"" code_out = b""
for i in range(max_index - min_index): for i in range(max_index - min_index):
code_out += code_chunks[i]
addr, addr0, addr1 = ctrlflow[i] addr, addr0, addr1 = ctrlflow[i]
code_out += decrypt_code(addr, len(code_out))
unk3 = obfu_code_table[addr][4] unk3 = obfu_code_table[addr][4]
cont_mode = (unk3 >> 12) & 0x7F cont_mode = (unk3 >> 12) & 0x7F
@ -577,7 +577,7 @@ def deobfu_func(ecstart):
jmp_code = jmp_code.format(addr0=block_offset0 + sum(map(len, code_chunks[:addr0_index])) + 16 * addr0_index - len(code_out), addr1=block_offset1 + sum(map(len, code_chunks[:addr1_index])) + 16 * addr1_index - len(code_out)) jmp_code = jmp_code.format(addr0=block_offset0 + sum(map(len, code_chunks[:addr0_index])) + 16 * addr0_index - len(code_out), addr1=block_offset1 + sum(map(len, code_chunks[:addr1_index])) + 16 * addr1_index - len(code_out))
jmp_code_bin = assemble(jmp_code) jmp_code_bin = assemble(jmp_code)
jmp_code_bin += b"\x90" * (16 - len(jmp_code_bin)) # dont like this but Ghidra kekw jmp_code_bin += b"\x90" * (16 - len(jmp_code_bin))
code_out += jmp_code_bin code_out += jmp_code_bin
for instr in md.disasm(code_out, 0): for instr in md.disasm(code_out, 0):