Patch out common annoying functions in CTF binaries

ctf_patch.py

IMPORTS_TO_PATCH = [
    "alarm",
    "ptrace"
]

# iterate over imported symbols
for import_sym in bv.get_symbols_of_type(SymbolType.ImportedFunctionSymbol):
    # check if symbol is in the patch list
    if import_sym.name in IMPORTS_TO_PATCH:
        log.log_info(f"patching out call to {import_sym.name}")

        # iterate over caller xrefs
        for xref in bv.get_callers(import_sym.address):
            # nop out the call
            bv.convert_to_nop(xref.address)

            # add a comment
            bv.set_comment_at(xref.address, f"nop'd call to {import_sym.name}()")

            log.log_info(f"nop'd out call to {import_sym.name}() @ {hex(xref.address)}")