4 # This script helps me to check the Linux kernel Kconfig option list
5 # against my hardening preferences for X86_64, ARM64, X86_32, and ARM.
6 # Let the computers do their job!
8 # Author: Alexander Popov <alex.popov@linux.com>
10 # Please don't cry if my Python code looks like C.
13 # N.B Hardening command line parameters:
17 # kernel.kptr_restrict=1
18 # lockdown=1 (is it changed?)
19 # page_alloc.shuffle=1
20 # iommu=force (does it help against DMA attacks?)
22 # Mitigations of CPU vulnerabilities:
24 # mitigations=auto,nosmt
28 # spec_store_bypass_disable=on
35 # N.B. Hardening sysctls:
36 # net.core.bpf_jit_harden=2
38 # vm.unprivileged_userfaultfd=0
39 # kernel.perf_event_paranoid=3
40 # kernel.yama.ptrace_scope=1 (or even 3?)
41 # kernel.unprivileged_bpf_disabled=1
43 # fs.protected_symlinks = 1
44 # fs.protected_hardlinks = 1
45 # fs.protected_fifos = 2
46 # fs.protected_regular = 2
49 from argparse import ArgumentParser
50 from collections import OrderedDict
54 debug_mode = False # set it to True to print the unknown options from the config
55 json_mode = False # if True, print results in JSON format
57 supported_archs = [ 'X86_64', 'X86_32', 'ARM64', 'ARM' ]
61 def __init__(self, name, expected, decision, reason):
63 self.expected = expected
64 self.decision = decision
70 if self.expected == self.state:
72 elif self.state is None:
73 if self.expected == 'is not set':
74 self.result = 'OK: not found'
76 self.result = 'FAIL: not found'
78 self.result = 'FAIL: "' + self.state + '"'
80 if self.result.startswith('OK'):
81 return True, self.result
83 return False, self.result
86 return '{} = {}'.format(self.name, self.state)
89 class ComplexOptCheck:
90 def __init__(self, *opts):
96 return self.opts[0].name
100 return self.opts[0].expected
104 return self.opts[0].state
108 return self.opts[0].decision
112 return self.opts[0].reason
115 class OR(ComplexOptCheck):
116 # self.opts[0] is the option which this OR-check is about.
118 # OR(<X_is_hardened>, <X_is_disabled>)
119 # OR(<X_is_hardened>, <X_is_hardened_old>)
123 sys.exit('[!] ERROR: invalid OR check')
125 for i, opt in enumerate(self.opts):
126 ret, msg = opt.check()
129 self.result = opt.result
131 self.result = 'OK: CONFIG_{} "{}"'.format(opt.name, opt.expected)
132 return True, self.result
133 self.result = self.opts[0].result
134 return False, self.result
137 class AND(ComplexOptCheck):
138 # self.opts[0] is the option which this AND-check is about.
139 # Use case: AND(<suboption>, <main_option>)
140 # Suboption is not checked if checking of the main_option is failed.
143 for i, opt in reversed(list(enumerate(self.opts))):
144 ret, msg = opt.check()
146 self.result = opt.result
147 return ret, self.result
149 self.result = 'FAIL: CONFIG_{} is needed'.format(opt.name)
150 return False, self.result
152 sys.exit('[!] ERROR: invalid AND check')
155 def detect_arch(fname):
156 with open(fname, 'r') as f:
157 arch_pattern = re.compile("CONFIG_[a-zA-Z0-9_]*=y")
161 print('[+] Trying to detect architecture in "{}"...'.format(fname))
162 for line in f.readlines():
163 if arch_pattern.match(line):
164 option, value = line[7:].split('=', 1)
165 if option in supported_archs:
169 return None, 'more than one supported architecture is detected'
171 return None, 'failed to detect architecture'
176 def construct_checklist(checklist, arch):
177 modules_not_set = OptCheck('MODULES', 'is not set', 'kspp', 'cut_attack_surface')
178 devmem_not_set = OptCheck('DEVMEM', 'is not set', 'kspp', 'cut_attack_surface') # refers to LOCK_DOWN_KERNEL
180 checklist.append(OptCheck('BUG', 'y', 'defconfig', 'self_protection'))
181 checklist.append(OR(OptCheck('STRICT_KERNEL_RWX', 'y', 'defconfig', 'self_protection'), \
182 OptCheck('DEBUG_RODATA', 'y', 'defconfig', 'self_protection'))) # before v4.11
183 checklist.append(OR(OptCheck('STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection'), \
184 OptCheck('CC_STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection')))
185 checklist.append(OptCheck('SLUB_DEBUG', 'y', 'defconfig', 'self_protection'))
186 checklist.append(OR(OptCheck('STRICT_MODULE_RWX', 'y', 'defconfig', 'self_protection'), \
187 OptCheck('DEBUG_SET_MODULE_RONX', 'y', 'defconfig', 'self_protection'), \
188 modules_not_set)) # DEBUG_SET_MODULE_RONX was before v4.11
189 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
190 checklist.append(OptCheck('MICROCODE', 'y', 'defconfig', 'self_protection')) # is needed for mitigating CPU bugs
191 checklist.append(OptCheck('RETPOLINE', 'y', 'defconfig', 'self_protection'))
192 checklist.append(OptCheck('X86_SMAP', 'y', 'defconfig', 'self_protection'))
193 checklist.append(OR(OptCheck('X86_UMIP', 'y', 'defconfig', 'self_protection'), \
194 OptCheck('X86_INTEL_UMIP', 'y', 'defconfig', 'self_protection')))
195 iommu_support_is_set = OptCheck('IOMMU_SUPPORT', 'y', 'defconfig', 'self_protection') # is needed for mitigating DMA attacks
196 checklist.append(iommu_support_is_set)
197 checklist.append(OptCheck('SYN_COOKIES', 'y', 'defconfig', 'self_protection')) # another reason?
198 if debug_mode or arch == 'X86_64':
199 checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'defconfig', 'self_protection'))
200 checklist.append(OptCheck('RANDOMIZE_MEMORY', 'y', 'defconfig', 'self_protection'))
201 checklist.append(AND(OptCheck('INTEL_IOMMU', 'y', 'defconfig', 'self_protection'), \
202 iommu_support_is_set))
203 checklist.append(AND(OptCheck('AMD_IOMMU', 'y', 'defconfig', 'self_protection'), \
204 iommu_support_is_set))
205 if debug_mode or arch == 'ARM64':
206 checklist.append(OptCheck('UNMAP_KERNEL_AT_EL0', 'y', 'defconfig', 'self_protection'))
207 checklist.append(OptCheck('HARDEN_EL2_VECTORS', 'y', 'defconfig', 'self_protection'))
208 checklist.append(OptCheck('RODATA_FULL_DEFAULT_ENABLED', 'y', 'defconfig', 'self_protection'))
209 if debug_mode or arch == 'X86_64' or arch == 'ARM64':
210 checklist.append(OptCheck('VMAP_STACK', 'y', 'defconfig', 'self_protection'))
211 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
212 checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'defconfig', 'self_protection'))
213 checklist.append(OptCheck('THREAD_INFO_IN_TASK', 'y', 'defconfig', 'self_protection'))
214 if debug_mode or arch == 'ARM':
215 checklist.append(OptCheck('VMSPLIT_3G', 'y', 'defconfig', 'self_protection'))
216 checklist.append(OptCheck('CPU_SW_DOMAIN_PAN', 'y', 'defconfig', 'self_protection'))
217 if debug_mode or arch == 'ARM64' or arch == 'ARM':
218 checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'defconfig', 'self_protection'))
219 checklist.append(OptCheck('HARDEN_BRANCH_PREDICTOR', 'y', 'defconfig', 'self_protection'))
221 checklist.append(OptCheck('BUG_ON_DATA_CORRUPTION', 'y', 'kspp', 'self_protection'))
222 checklist.append(OptCheck('DEBUG_WX', 'y', 'kspp', 'self_protection'))
223 checklist.append(OptCheck('SCHED_STACK_END_CHECK', 'y', 'kspp', 'self_protection'))
224 checklist.append(OptCheck('SLAB_FREELIST_HARDENED', 'y', 'kspp', 'self_protection'))
225 checklist.append(OptCheck('SLAB_FREELIST_RANDOM', 'y', 'kspp', 'self_protection'))
226 checklist.append(OptCheck('SHUFFLE_PAGE_ALLOCATOR', 'y', 'kspp', 'self_protection'))
227 checklist.append(OptCheck('FORTIFY_SOURCE', 'y', 'kspp', 'self_protection'))
228 checklist.append(OptCheck('GCC_PLUGINS', 'y', 'kspp', 'self_protection'))
229 randstruct_is_set = OptCheck('GCC_PLUGIN_RANDSTRUCT', 'y', 'kspp', 'self_protection')
230 checklist.append(randstruct_is_set)
231 checklist.append(OptCheck('GCC_PLUGIN_LATENT_ENTROPY', 'y', 'kspp', 'self_protection'))
232 checklist.append(OptCheck('DEBUG_LIST', 'y', 'kspp', 'self_protection'))
233 checklist.append(OptCheck('DEBUG_SG', 'y', 'kspp', 'self_protection'))
234 checklist.append(OptCheck('DEBUG_CREDENTIALS', 'y', 'kspp', 'self_protection'))
235 checklist.append(OptCheck('DEBUG_NOTIFIERS', 'y', 'kspp', 'self_protection'))
236 page_poisoning_is_set = OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection')
237 checklist.append(page_poisoning_is_set)
238 hardened_usercopy_is_set = OptCheck('HARDENED_USERCOPY', 'y', 'kspp', 'self_protection')
239 checklist.append(hardened_usercopy_is_set)
240 checklist.append(AND(OptCheck('HARDENED_USERCOPY_FALLBACK', 'is not set', 'kspp', 'self_protection'), \
241 hardened_usercopy_is_set))
242 checklist.append(OR(OptCheck('MODULE_SIG', 'y', 'kspp', 'self_protection'), \
244 checklist.append(OR(OptCheck('MODULE_SIG_ALL', 'y', 'kspp', 'self_protection'), \
246 checklist.append(OR(OptCheck('MODULE_SIG_SHA512', 'y', 'kspp', 'self_protection'), \
248 checklist.append(OR(OptCheck('MODULE_SIG_FORCE', 'y', 'kspp', 'self_protection'), \
249 modules_not_set)) # refers to LOCK_DOWN_KERNEL
250 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
251 checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '65536', 'kspp', 'self_protection'))
252 checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'kspp', 'self_protection'))
253 if debug_mode or arch == 'X86_32':
254 checklist.append(OptCheck('HIGHMEM64G', 'y', 'kspp', 'self_protection'))
255 checklist.append(OptCheck('X86_PAE', 'y', 'kspp', 'self_protection'))
256 if debug_mode or arch == 'ARM64':
257 checklist.append(OptCheck('ARM64_SW_TTBR0_PAN', 'y', 'kspp', 'self_protection'))
258 if debug_mode or arch == 'ARM64' or arch == 'ARM':
259 checklist.append(OptCheck('SYN_COOKIES', 'y', 'kspp', 'self_protection')) # another reason?
260 checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '32768', 'kspp', 'self_protection'))
262 checklist.append(OR(OptCheck('INIT_STACK_ALL', 'y', 'clipos', 'self_protection'), \
263 OptCheck('GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y', 'kspp', 'self_protection')))
264 checklist.append(OptCheck('INIT_ON_ALLOC_DEFAULT_ON', 'y', 'clipos', 'self_protection'))
265 checklist.append(OptCheck('INIT_ON_FREE_DEFAULT_ON', 'y', 'clipos', 'self_protection'))
266 checklist.append(OptCheck('SECURITY_DMESG_RESTRICT', 'y', 'clipos', 'self_protection'))
267 checklist.append(OptCheck('DEBUG_VIRTUAL', 'y', 'clipos', 'self_protection'))
268 checklist.append(OptCheck('STATIC_USERMODEHELPER', 'y', 'clipos', 'self_protection')) # needs userspace support (systemd)
269 checklist.append(OptCheck('SLAB_MERGE_DEFAULT', 'is not set', 'clipos', 'self_protection')) # slab_nomerge
270 checklist.append(AND(OptCheck('GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set', 'clipos', 'self_protection'), \
272 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
273 stackleak_is_set = OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'clipos', 'self_protection')
274 checklist.append(stackleak_is_set)
275 checklist.append(AND(OptCheck('STACKLEAK_METRICS', 'is not set', 'clipos', 'self_protection'), \
277 checklist.append(AND(OptCheck('STACKLEAK_RUNTIME_DISABLE', 'is not set', 'clipos', 'self_protection'), \
279 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
280 checklist.append(OptCheck('RANDOM_TRUST_CPU', 'is not set', 'clipos', 'self_protection'))
281 checklist.append(AND(OptCheck('INTEL_IOMMU_SVM', 'y', 'clipos', 'self_protection'), \
282 iommu_support_is_set))
283 checklist.append(AND(OptCheck('INTEL_IOMMU_DEFAULT_ON', 'y', 'clipos', 'self_protection'), \
284 iommu_support_is_set))
286 checklist.append(OptCheck('SLUB_DEBUG_ON', 'y', 'my', 'self_protection'))
287 checklist.append(OptCheck('RESET_ATTACK_MITIGATION', 'y', 'my', 'self_protection')) # needs userspace support (systemd)
288 checklist.append(AND(OptCheck('PAGE_POISONING_NO_SANITY', 'is not set', 'my', 'self_protection'), \
289 page_poisoning_is_set))
290 checklist.append(AND(OptCheck('PAGE_POISONING_ZERO', 'is not set', 'my', 'self_protection'), \
291 page_poisoning_is_set))
292 if debug_mode or arch == 'X86_64':
293 checklist.append(AND(OptCheck('AMD_IOMMU_V2', 'y', 'my', 'self_protection'), \
294 iommu_support_is_set))
295 if debug_mode or arch == 'X86_32':
296 checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'my', 'self_protection'))
297 if debug_mode or arch == 'ARM':
298 checklist.append(OptCheck('STACKPROTECTOR_PER_TASK', 'y', 'my', 'self_protection'))
300 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
301 checklist.append(OptCheck('SECURITY', 'y', 'defconfig', 'security_policy')) # and choose your favourite LSM
302 if debug_mode or arch == 'ARM':
303 checklist.append(OptCheck('SECURITY', 'y', 'kspp', 'security_policy')) # and choose your favourite LSM
304 checklist.append(OptCheck('SECURITY_WRITABLE_HOOKS', 'is not set', 'defconfig', 'security_policy'))
305 checklist.append(OptCheck('SECURITY_YAMA', 'y', 'kspp', 'security_policy'))
306 checklist.append(OptCheck('SECURITY_LOADPIN', 'y', 'my', 'security_policy')) # needs userspace support
307 checklist.append(OptCheck('SECURITY_LOCKDOWN_LSM', 'y', 'my', 'security_policy'))
308 checklist.append(OptCheck('SECURITY_LOCKDOWN_LSM_EARLY', 'y', 'my', 'security_policy'))
309 checklist.append(OptCheck('LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY', 'y', 'my', 'security_policy'))
310 checklist.append(OptCheck('SECURITY_SAFESETID', 'y', 'my', 'security_policy'))
312 checklist.append(OptCheck('SECCOMP', 'y', 'defconfig', 'cut_attack_surface'))
313 checklist.append(OptCheck('SECCOMP_FILTER', 'y', 'defconfig', 'cut_attack_surface'))
314 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
315 checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'defconfig', 'cut_attack_surface'), \
316 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
318 checklist.append(modules_not_set)
319 checklist.append(devmem_not_set)
320 checklist.append(OR(OptCheck('IO_STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \
321 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
322 if debug_mode or arch == 'ARM':
323 checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \
324 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
325 checklist.append(OptCheck('ACPI_CUSTOM_METHOD', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
326 checklist.append(OptCheck('COMPAT_BRK', 'is not set', 'kspp', 'cut_attack_surface'))
327 checklist.append(OptCheck('DEVKMEM', 'is not set', 'kspp', 'cut_attack_surface'))
328 checklist.append(OptCheck('COMPAT_VDSO', 'is not set', 'kspp', 'cut_attack_surface'))
329 checklist.append(OptCheck('BINFMT_MISC', 'is not set', 'kspp', 'cut_attack_surface'))
330 checklist.append(OptCheck('INET_DIAG', 'is not set', 'kspp', 'cut_attack_surface'))
331 checklist.append(OptCheck('KEXEC', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
332 checklist.append(OptCheck('PROC_KCORE', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
333 checklist.append(OptCheck('LEGACY_PTYS', 'is not set', 'kspp', 'cut_attack_surface'))
334 checklist.append(OptCheck('HIBERNATION', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
335 if debug_mode or arch == 'X86_64':
336 checklist.append(OptCheck('LEGACY_VSYSCALL_NONE', 'y', 'kspp', 'cut_attack_surface')) # 'vsyscall=none'
337 checklist.append(OptCheck('IA32_EMULATION', 'is not set', 'kspp', 'cut_attack_surface'))
338 checklist.append(OptCheck('X86_X32', 'is not set', 'kspp', 'cut_attack_surface'))
339 checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'kspp', 'cut_attack_surface'))
340 if debug_mode or arch == 'ARM':
341 checklist.append(OptCheck('OABI_COMPAT', 'is not set', 'kspp', 'cut_attack_surface'))
343 checklist.append(OptCheck('X86_PTDUMP', 'is not set', 'grsecurity', 'cut_attack_surface'))
344 checklist.append(OptCheck('ZSMALLOC_STAT', 'is not set', 'grsecurity', 'cut_attack_surface'))
345 checklist.append(OptCheck('PAGE_OWNER', 'is not set', 'grsecurity', 'cut_attack_surface'))
346 checklist.append(OptCheck('DEBUG_KMEMLEAK', 'is not set', 'grsecurity', 'cut_attack_surface'))
347 checklist.append(OptCheck('BINFMT_AOUT', 'is not set', 'grsecurity', 'cut_attack_surface'))
348 checklist.append(OptCheck('KPROBES', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
349 checklist.append(OptCheck('UPROBES', 'is not set', 'grsecurity', 'cut_attack_surface'))
350 checklist.append(OptCheck('GENERIC_TRACER', 'is not set', 'grsecurity', 'cut_attack_surface'))
351 checklist.append(OptCheck('PROC_VMCORE', 'is not set', 'grsecurity', 'cut_attack_surface'))
352 checklist.append(OptCheck('PROC_PAGE_MONITOR', 'is not set', 'grsecurity', 'cut_attack_surface'))
353 checklist.append(OptCheck('USELIB', 'is not set', 'grsecurity', 'cut_attack_surface'))
354 checklist.append(OptCheck('CHECKPOINT_RESTORE', 'is not set', 'grsecurity', 'cut_attack_surface'))
355 checklist.append(OptCheck('USERFAULTFD', 'is not set', 'grsecurity', 'cut_attack_surface'))
356 checklist.append(OptCheck('HWPOISON_INJECT', 'is not set', 'grsecurity', 'cut_attack_surface'))
357 checklist.append(OptCheck('MEM_SOFT_DIRTY', 'is not set', 'grsecurity', 'cut_attack_surface'))
358 checklist.append(OptCheck('DEVPORT', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
359 checklist.append(OptCheck('DEBUG_FS', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
360 checklist.append(OptCheck('NOTIFIER_ERROR_INJECTION','is not set', 'grsecurity', 'cut_attack_surface'))
362 checklist.append(OptCheck('ACPI_TABLE_UPGRADE', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
363 checklist.append(OptCheck('ACPI_APEI_EINJ', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
364 checklist.append(OptCheck('PROFILING', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
365 checklist.append(OptCheck('BPF_SYSCALL', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
366 checklist.append(OptCheck('MMIOTRACE_TEST', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
368 checklist.append(OptCheck('KSM', 'is not set', 'clipos', 'cut_attack_surface')) # to prevent FLUSH+RELOAD attack
369 # checklist.append(OptCheck('IKCONFIG', 'is not set', 'clipos', 'cut_attack_surface')) # no, this info is needed for this check :)
370 checklist.append(OptCheck('KALLSYMS', 'is not set', 'clipos', 'cut_attack_surface'))
371 checklist.append(OptCheck('X86_VSYSCALL_EMULATION', 'is not set', 'clipos', 'cut_attack_surface'))
372 checklist.append(OptCheck('MAGIC_SYSRQ', 'is not set', 'clipos', 'cut_attack_surface'))
373 checklist.append(OptCheck('KEXEC_FILE', 'is not set', 'clipos', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
374 checklist.append(OptCheck('USER_NS', 'is not set', 'clipos', 'cut_attack_surface')) # user.max_user_namespaces=0
375 checklist.append(OptCheck('LDISC_AUTOLOAD', 'is not set', 'clipos', 'cut_attack_surface'))
377 checklist.append(OptCheck('MMIOTRACE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
378 checklist.append(OptCheck('LIVEPATCH', 'is not set', 'my', 'cut_attack_surface'))
379 checklist.append(OptCheck('IP_DCCP', 'is not set', 'my', 'cut_attack_surface'))
380 checklist.append(OptCheck('IP_SCTP', 'is not set', 'my', 'cut_attack_surface'))
381 checklist.append(OptCheck('FTRACE', 'is not set', 'my', 'cut_attack_surface'))
382 checklist.append(OptCheck('BPF_JIT', 'is not set', 'my', 'cut_attack_surface'))
383 checklist.append(OptCheck('VIDEO_VIVID', 'is not set', 'my', 'cut_attack_surface'))
384 if debug_mode or arch == 'X86_32':
385 checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'my', 'cut_attack_surface'))
387 if debug_mode or arch == 'ARM64':
388 checklist.append(OptCheck('ARM64_PTR_AUTH', 'y', 'defconfig', 'userspace_hardening'))
389 if debug_mode or arch == 'X86_64' or arch == 'ARM64':
390 checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '32', 'clipos', 'userspace_hardening'))
391 if debug_mode or arch == 'X86_32' or arch == 'ARM':
392 checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '16', 'my', 'userspace_hardening'))
394 # checklist.append(OptCheck('LKDTM', 'm', 'my', 'feature_test'))
397 def print_checklist(checklist, with_results):
401 opt = ['CONFIG_'+o.name, o.expected, o.decision, o.reason]
405 print(json.dumps(opts))
409 print('{:^45}|{:^13}|{:^10}|{:^20}'.format('option name', 'desired val', 'decision', 'reason'), end='')
412 print('| {}'.format('check result'), end='')
416 print('=' * sep_line_len)
418 for opt in checklist:
419 print('CONFIG_{:<38}|{:^13}|{:^10}|{:^20}'.format(opt.name, opt.expected, opt.decision, opt.reason), end='')
421 print('| {}'.format(opt.result), end='')
426 def get_option_state(options, name):
427 return options.get(name, None)
430 def perform_checks(checklist, parsed_options):
431 for opt in checklist:
432 if hasattr(opt, 'opts'):
434 o.state = get_option_state(parsed_options, o.name)
436 opt.state = get_option_state(parsed_options, opt.name)
440 def check_config_file(checklist, fname):
441 with open(fname, 'r') as f:
442 parsed_options = OrderedDict()
443 opt_is_on = re.compile("CONFIG_[a-zA-Z0-9_]*=[a-zA-Z0-9_\"]*")
444 opt_is_off = re.compile("# CONFIG_[a-zA-Z0-9_]* is not set")
447 print('[+] Checking "{}" against hardening preferences...'.format(fname))
448 for line in f.readlines():
453 if opt_is_on.match(line):
454 option, value = line[7:].split('=', 1)
455 elif opt_is_off.match(line):
456 option, value = line[9:].split(' ', 1)
457 if value != 'is not set':
458 sys.exit('[!] ERROR: bad disabled config option "{}"'.format(line))
460 if option in parsed_options:
461 sys.exit('[!] ERROR: config option "{}" exists multiple times'.format(line))
463 if option is not None:
464 parsed_options[option] = value
466 perform_checks(checklist, parsed_options)
469 known_options = [opt.name for opt in checklist]
470 for option, value in parsed_options.items():
471 if option not in known_options:
472 print("DEBUG: dunno about option {} ({})".format(option, value))
474 print_checklist(checklist, True)
477 if __name__ == '__main__':
478 config_checklist = []
480 parser = ArgumentParser(description='Checks the hardening options in the Linux kernel config')
481 parser.add_argument('-p', '--print', choices=supported_archs,
482 help='print hardening preferences for selected architecture')
483 parser.add_argument('-c', '--config',
484 help='check the config_file against these preferences')
485 parser.add_argument('--debug', action='store_true',
486 help='enable internal debug mode')
487 parser.add_argument('--json', action='store_true',
488 help='print results in JSON format')
489 args = parser.parse_args()
495 if debug_mode and json_mode:
496 sys.exit('[!] ERROR: options --debug and --json cannot be used simultaneously')
499 arch, msg = detect_arch(args.config)
501 sys.exit('[!] ERROR: {}'.format(msg))
503 print('[+] Detected architecture: {}'.format(arch))
505 construct_checklist(config_checklist, arch)
506 check_config_file(config_checklist, args.config)
507 error_count = len(list(filter(lambda opt: opt.result.startswith('FAIL'), config_checklist)))
508 ok_count = len(list(filter(lambda opt: opt.result.startswith('OK'), config_checklist)))
512 print('[+] config check is finished: \'OK\' - {} / \'FAIL\' - {}'.format(ok_count, error_count))
517 construct_checklist(config_checklist, arch)
519 print('[+] Printing kernel hardening preferences for {}...'.format(arch))
520 print_checklist(config_checklist, False)