# page_alloc.shuffle=1
# iommu=force (does it help against DMA attacks?)
# page_poison=1 (if enabled)
+# init_on_alloc=1
+# init_on_free=1
#
# Mitigations of CPU vulnerabilities:
# Аrch-independent:
json_mode = False # if True, print results in JSON format
supported_archs = [ 'X86_64', 'X86_32', 'ARM64', 'ARM' ]
+config_checklist = []
+kernel_version = None
class OptCheck:
else:
return False, self.result
- def __repr__(self):
- return '{} = {}'.format(self.name, self.state)
+
+class VerCheck:
+ def __init__(self, ver_expected):
+ self.ver_expected = ver_expected
+ self.result = None
+
+ def check(self):
+ if kernel_version[0] > self.ver_expected[0]:
+ self.result = 'OK: version >= ' + str(self.ver_expected[0]) + '.' + str(self.ver_expected[1])
+ return True, self.result
+ if kernel_version[0] < self.ver_expected[0]:
+ self.result = 'FAIL: version < ' + str(self.ver_expected[0]) + '.' + str(self.ver_expected[1])
+ return False, self.result
+ if kernel_version[1] >= self.ver_expected[1]:
+ self.result = 'OK: version >= ' + str(self.ver_expected[0]) + '.' + str(self.ver_expected[1])
+ return True, self.result
+ else:
+ self.result = 'FAIL: version < ' + str(self.ver_expected[0]) + '.' + str(self.ver_expected[1])
+ return False, self.result
class ComplexOptCheck:
for i, opt in enumerate(self.opts):
ret, msg = opt.check()
if ret:
- if i == 0:
+ if i == 0 or not hasattr(opt, 'name'):
self.result = opt.result
else:
self.result = 'OK: CONFIG_{} "{}"'.format(opt.name, opt.expected)
self.result = opt.result
return ret, self.result
elif not ret:
- self.result = 'FAIL: CONFIG_{} is needed'.format(opt.name)
+ if hasattr(opt, 'name'):
+ self.result = 'FAIL: CONFIG_{} is needed'.format(opt.name)
+ else:
+ self.result = opt.result
return False, self.result
sys.exit('[!] ERROR: invalid AND check')
OptCheck('DEBUG_SET_MODULE_RONX', 'y', 'defconfig', 'self_protection'), \
modules_not_set)) # DEBUG_SET_MODULE_RONX was before v4.11
checklist.append(OptCheck('GCC_PLUGINS', 'y', 'defconfig', 'self_protection'))
+ checklist.append(OR(OptCheck('REFCOUNT_FULL', 'y', 'defconfig', 'self_protection'), \
+ VerCheck((5, 5)))) # REFCOUNT_FULL is enabled by default since v5.5
if debug_mode or arch == 'X86_64' or arch == 'X86_32':
checklist.append(OptCheck('MICROCODE', 'y', 'defconfig', 'self_protection')) # is needed for mitigating CPU bugs
checklist.append(OptCheck('RETPOLINE', 'y', 'defconfig', 'self_protection'))
checklist.append(OptCheck('CPU_SW_DOMAIN_PAN', 'y', 'defconfig', 'self_protection'))
checklist.append(OptCheck('STACKPROTECTOR_PER_TASK', 'y', 'defconfig', 'self_protection'))
if debug_mode or arch == 'ARM64' or arch == 'ARM':
- checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'defconfig', 'self_protection'))
checklist.append(OptCheck('HARDEN_BRANCH_PREDICTOR', 'y', 'defconfig', 'self_protection'))
checklist.append(OptCheck('BUG_ON_DATA_CORRUPTION', 'y', 'kspp', 'self_protection'))
modules_not_set))
checklist.append(OR(OptCheck('MODULE_SIG_FORCE', 'y', 'kspp', 'self_protection'), \
modules_not_set)) # refers to LOCK_DOWN_KERNEL
+ checklist.append(OR(OptCheck('INIT_STACK_ALL', 'y', 'kspp', 'self_protection'), \
+ OptCheck('GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y', 'kspp', 'self_protection')))
+ checklist.append(OptCheck('INIT_ON_ALLOC_DEFAULT_ON', 'y', 'kspp', 'self_protection'))
+ checklist.append(OR(OptCheck('INIT_ON_FREE_DEFAULT_ON', 'y', 'kspp', 'self_protection'), \
+ OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection'))) # before v5.3
+ if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
+ stackleak_is_set = OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'kspp', 'self_protection')
+ checklist.append(stackleak_is_set)
+ checklist.append(AND(OptCheck('STACKLEAK_METRICS', 'is not set', 'clipos', 'self_protection'), \
+ stackleak_is_set))
+ checklist.append(AND(OptCheck('STACKLEAK_RUNTIME_DISABLE', 'is not set', 'clipos', 'self_protection'), \
+ stackleak_is_set))
if debug_mode or arch == 'X86_64' or arch == 'X86_32':
checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '65536', 'kspp', 'self_protection'))
- checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'kspp', 'self_protection'))
if debug_mode or arch == 'X86_32':
checklist.append(OptCheck('HIGHMEM64G', 'y', 'kspp', 'self_protection'))
checklist.append(OptCheck('X86_PAE', 'y', 'kspp', 'self_protection'))
checklist.append(OptCheck('SYN_COOKIES', 'y', 'kspp', 'self_protection')) # another reason?
checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '32768', 'kspp', 'self_protection'))
- checklist.append(OR(OptCheck('INIT_STACK_ALL', 'y', 'clipos', 'self_protection'), \
- OptCheck('GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y', 'kspp', 'self_protection')))
- checklist.append(OptCheck('INIT_ON_ALLOC_DEFAULT_ON', 'y', 'clipos', 'self_protection'))
- checklist.append(OR(OptCheck('INIT_ON_FREE_DEFAULT_ON', 'y', 'clipos', 'self_protection'), \
- OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection')))
checklist.append(OptCheck('SECURITY_DMESG_RESTRICT', 'y', 'clipos', 'self_protection'))
checklist.append(OptCheck('DEBUG_VIRTUAL', 'y', 'clipos', 'self_protection'))
checklist.append(OptCheck('STATIC_USERMODEHELPER', 'y', 'clipos', 'self_protection')) # needs userspace support (systemd)
checklist.append(OptCheck('SLAB_MERGE_DEFAULT', 'is not set', 'clipos', 'self_protection')) # slab_nomerge
checklist.append(AND(OptCheck('GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set', 'clipos', 'self_protection'), \
randstruct_is_set))
- if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
- stackleak_is_set = OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'clipos', 'self_protection')
- checklist.append(stackleak_is_set)
- checklist.append(AND(OptCheck('STACKLEAK_METRICS', 'is not set', 'clipos', 'self_protection'), \
- stackleak_is_set))
- checklist.append(AND(OptCheck('STACKLEAK_RUNTIME_DISABLE', 'is not set', 'clipos', 'self_protection'), \
- stackleak_is_set))
if debug_mode or arch == 'X86_64' or arch == 'X86_32':
checklist.append(OptCheck('RANDOM_TRUST_CPU', 'is not set', 'clipos', 'self_protection'))
checklist.append(AND(OptCheck('INTEL_IOMMU_SVM', 'y', 'clipos', 'self_protection'), \
checklist.append(OptCheck('MAGIC_SYSRQ', 'is not set', 'clipos', 'cut_attack_surface'))
checklist.append(OptCheck('KEXEC_FILE', 'is not set', 'clipos', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
checklist.append(OptCheck('USER_NS', 'is not set', 'clipos', 'cut_attack_surface')) # user.max_user_namespaces=0
- checklist.append(OptCheck('LDISC_AUTOLOAD', 'is not set', 'clipos', 'cut_attack_surface'))
+ checklist.append(AND(OptCheck('LDISC_AUTOLOAD', 'is not set', 'clipos', 'cut_attack_surface'), \
+ VerCheck((5, 1)))) # LDISC_AUTOLOAD can be disabled since v5.1
checklist.append(OptCheck('MMIOTRACE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
checklist.append(OptCheck('LIVEPATCH', 'is not set', 'my', 'cut_attack_surface'))
print(json.dumps(opts))
return
- # header
- print('{:^45}|{:^13}|{:^10}|{:^20}'.format('option name', 'desired val', 'decision', 'reason'), end='')
+ # table header
sep_line_len = 91
if with_results:
- print('| {}'.format('check result'), end='')
sep_line_len += 30
+ print('=' * sep_line_len)
+ print('{:^45}|{:^13}|{:^10}|{:^20}'.format('option name', 'desired val', 'decision', 'reason'), end='')
+ if with_results:
+ print('| {}'.format('check result'), end='')
print()
-
print('=' * sep_line_len)
for opt in checklist:
if hasattr(opt, 'opts'):
# prepare ComplexOptCheck
for o in opt.opts:
- o.state = parsed_options.get(o.name, None)
+ if hasattr(o, 'name'):
+ o.state = parsed_options.get(o.name, None)
else:
- # prepare OptCheck
+ # prepare simple OptCheck
+ if not hasattr(opt, 'name'):
+ sys.exit('[!] ERROR: bad OptCheck {}'.format(vars(opt)))
opt.state = parsed_options.get(opt.name, None)
opt.check()
if __name__ == '__main__':
- config_checklist = []
-
parser = ArgumentParser(description='Checks the hardening options in the Linux kernel config')
parser.add_argument('-p', '--print', choices=supported_archs,
help='print hardening preferences for selected architecture')
projects / kconfig-hardened-check.git / blobdiff