def change_interpreter(target, interpreter, output=None):
if not os.path.isfile(target) or not lief.is_elf(target):
print("Wrong target! ({})".format(target))
return 1
if not os.path.isfile(interpreter) or not lief.is_elf(interpreter):
print("Wrong interpreter! ({})".format(interpreter))
return 1
binary = lief.parse(target)
if not binary.has_interpreter:
print("The given target doesn't have interpreter!")
return 1
binary.interpreter = interpreter
output_path = output
if output_path is None:
output_path = os.path.basename(target)
output_path += "_updated"
if os.path.isfile(output_path):
os.remove(output_path)
binary.write(output_path)
# Set as executable
st = os.stat(output_path)
os.chmod(output_path, st.st_mode | stat.S_IEXEC)
return 0
def find_libc():
"""Find the fullpath to the libc library with multiple methods"""
libc_path = None
try:
libc_path = find_library_full("c")
except (FileNotFoundError, AttributeError, RuntimeError):
# ldconfig is not accessible as user
# or running on Windows
# or other errors
try:
libc_path = find_libc_ldd()
except (FileNotFoundError, RuntimeError):
# test hardcoded paths
logging.debug("Finding libc path: hardcoded paths")
for maybe_libc in LIBC_PATH_POSSIBILITIES:
logging.debug("Testing libc at %s", maybe_libc)
maybe_libc_path = Path(maybe_libc)
if maybe_libc_path.exists():
# symlink
if maybe_libc_path.is_symlink():
dst = os.readlink(str(maybe_libc_path))
logging.debug("Resolve symlink %s -> %s",
maybe_libc_path, dst)
maybe_libc_path = Path(dst)
if lief.is_elf(str(maybe_libc_path)):
libc_path = maybe_libc
break
if libc_path is None:
raise LibcNotFoundError(
"Cannot find a suitable libc path on your system")
logging.debug("Found libc: %s", libc_path)
return libc_path
def detect_binary_format(input_path):
if lief.is_macho(input_path):
return BinaryFormat.MACHO
elif lief.is_elf(input_path):
return BinaryFormat.ELF
else:
return None
def try_patch_file(path, pkgdir):
if not os.path.isfile(path) or not lief.is_elf(path):
return
binary = lief.parse(path)
if not binary.has_interpreter:
return
old_interp = binary.interpreter
if old_interp.endswith('/ld-linux-x86-64.so.2'):
if (old_interp == '/lib64/ld-linux-x86-64.so.2'
or old_interp == '/usr/lib64/ld-linux-x86-64.so.2'
or old_interp == '/usr/lib/ld-linux-x86-64.so.2'):
return
binary.interpreter = '/lib/ld-linux-x86-64.so.2'
elif old_interp.startswith(pkgdir + '/'):
binary.interpreter = old_interp[len(pkgdir):]
if old_interp == binary.interpreter:
return
print("Patching .interp for %s to %s" % (path, binary.interpreter))
os.remove(path)
binary.write(path)
st = os.stat(path)
os.chmod(path, st.st_mode | stat.S_IEXEC)
def check(path):
if lief.is_pe(path):
print("PE not supported")
return -1
if lief.is_macho(path):
print("Macho not supported")
return -1
if lief.is_elf(path):
return 0
return -1
def is_elf(self, elf_path):
return lief.is_elf(elf_path)
def is_elf(filepath: Path) -> bool:
return lief.is_elf(str(filepath))
