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:
16 # kernel.kptr_restrict=1
17 # lockdown=1 (is it changed?)
18 # page_alloc.shuffle=1
19 # iommu=force (does it help against DMA attacks?)
20 # page_poison=1 (if enabled)
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")
160 print('[+] Trying to detect architecture in "{}"...'.format(fname))
161 for line in f.readlines():
162 if arch_pattern.match(line):
163 option, value = line[7:].split('=', 1)
164 if option in supported_archs:
168 return None, 'more than one supported architecture is detected'
170 return None, 'failed to detect architecture'
175 def detect_version(fname):
176 with open(fname, 'r') as f:
177 ver_pattern = re.compile("# Linux/.* Kernel Configuration")
179 print('[+] Trying to detect kernel version in "{}"...'.format(fname))
180 for line in f.readlines():
181 if ver_pattern.match(line):
184 print('[+] Found version line: "{}"'.format(line))
187 ver_numbers = ver_str.split('.')
188 if len(ver_numbers) < 3 or not ver_numbers[0].isdigit() or not ver_numbers[1].isdigit():
189 msg = 'failed to parse the version "' + ver_str + '"'
192 return (int(ver_numbers[0]), int(ver_numbers[1])), None
193 return None, 'no kernel version detected'
196 def construct_checklist(checklist, arch):
197 modules_not_set = OptCheck('MODULES', 'is not set', 'kspp', 'cut_attack_surface')
198 devmem_not_set = OptCheck('DEVMEM', 'is not set', 'kspp', 'cut_attack_surface') # refers to LOCK_DOWN_KERNEL
200 checklist.append(OptCheck('BUG', 'y', 'defconfig', 'self_protection'))
201 checklist.append(OR(OptCheck('STRICT_KERNEL_RWX', 'y', 'defconfig', 'self_protection'), \
202 OptCheck('DEBUG_RODATA', 'y', 'defconfig', 'self_protection'))) # before v4.11
203 checklist.append(OR(OptCheck('STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection'), \
204 OptCheck('CC_STACKPROTECTOR_STRONG', 'y', 'defconfig', 'self_protection')))
205 checklist.append(OptCheck('SLUB_DEBUG', 'y', 'defconfig', 'self_protection'))
206 checklist.append(OR(OptCheck('STRICT_MODULE_RWX', 'y', 'defconfig', 'self_protection'), \
207 OptCheck('DEBUG_SET_MODULE_RONX', 'y', 'defconfig', 'self_protection'), \
208 modules_not_set)) # DEBUG_SET_MODULE_RONX was before v4.11
209 checklist.append(OptCheck('GCC_PLUGINS', 'y', 'defconfig', 'self_protection'))
210 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
211 checklist.append(OptCheck('MICROCODE', 'y', 'defconfig', 'self_protection')) # is needed for mitigating CPU bugs
212 checklist.append(OptCheck('RETPOLINE', 'y', 'defconfig', 'self_protection'))
213 checklist.append(OptCheck('X86_SMAP', 'y', 'defconfig', 'self_protection'))
214 checklist.append(OR(OptCheck('X86_UMIP', 'y', 'defconfig', 'self_protection'), \
215 OptCheck('X86_INTEL_UMIP', 'y', 'defconfig', 'self_protection')))
216 iommu_support_is_set = OptCheck('IOMMU_SUPPORT', 'y', 'defconfig', 'self_protection') # is needed for mitigating DMA attacks
217 checklist.append(iommu_support_is_set)
218 checklist.append(OptCheck('SYN_COOKIES', 'y', 'defconfig', 'self_protection')) # another reason?
219 if debug_mode or arch == 'X86_64':
220 checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'defconfig', 'self_protection'))
221 checklist.append(OptCheck('RANDOMIZE_MEMORY', 'y', 'defconfig', 'self_protection'))
222 checklist.append(AND(OptCheck('INTEL_IOMMU', 'y', 'defconfig', 'self_protection'), \
223 iommu_support_is_set))
224 checklist.append(AND(OptCheck('AMD_IOMMU', 'y', 'defconfig', 'self_protection'), \
225 iommu_support_is_set))
226 if debug_mode or arch == 'ARM64':
227 checklist.append(OptCheck('UNMAP_KERNEL_AT_EL0', 'y', 'defconfig', 'self_protection'))
228 checklist.append(OptCheck('HARDEN_EL2_VECTORS', 'y', 'defconfig', 'self_protection'))
229 checklist.append(OptCheck('RODATA_FULL_DEFAULT_ENABLED', 'y', 'defconfig', 'self_protection'))
230 if debug_mode or arch == 'X86_64' or arch == 'ARM64':
231 checklist.append(OptCheck('VMAP_STACK', 'y', 'defconfig', 'self_protection'))
232 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
233 checklist.append(OptCheck('RANDOMIZE_BASE', 'y', 'defconfig', 'self_protection'))
234 checklist.append(OptCheck('THREAD_INFO_IN_TASK', 'y', 'defconfig', 'self_protection'))
235 if debug_mode or arch == 'ARM':
236 checklist.append(OptCheck('VMSPLIT_3G', 'y', 'defconfig', 'self_protection'))
237 checklist.append(OptCheck('CPU_SW_DOMAIN_PAN', 'y', 'defconfig', 'self_protection'))
238 checklist.append(OptCheck('STACKPROTECTOR_PER_TASK', 'y', 'defconfig', 'self_protection'))
239 if debug_mode or arch == 'ARM64' or arch == 'ARM':
240 checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'defconfig', 'self_protection'))
241 checklist.append(OptCheck('HARDEN_BRANCH_PREDICTOR', 'y', 'defconfig', 'self_protection'))
243 checklist.append(OptCheck('BUG_ON_DATA_CORRUPTION', 'y', 'kspp', 'self_protection'))
244 checklist.append(OptCheck('DEBUG_WX', 'y', 'kspp', 'self_protection'))
245 checklist.append(OptCheck('SCHED_STACK_END_CHECK', 'y', 'kspp', 'self_protection'))
246 checklist.append(OptCheck('SLAB_FREELIST_HARDENED', 'y', 'kspp', 'self_protection'))
247 checklist.append(OptCheck('SLAB_FREELIST_RANDOM', 'y', 'kspp', 'self_protection'))
248 checklist.append(OptCheck('SHUFFLE_PAGE_ALLOCATOR', 'y', 'kspp', 'self_protection'))
249 checklist.append(OptCheck('FORTIFY_SOURCE', 'y', 'kspp', 'self_protection'))
250 randstruct_is_set = OptCheck('GCC_PLUGIN_RANDSTRUCT', 'y', 'kspp', 'self_protection')
251 checklist.append(randstruct_is_set)
252 checklist.append(OptCheck('GCC_PLUGIN_LATENT_ENTROPY', 'y', 'kspp', 'self_protection'))
253 checklist.append(OptCheck('DEBUG_LIST', 'y', 'kspp', 'self_protection'))
254 checklist.append(OptCheck('DEBUG_SG', 'y', 'kspp', 'self_protection'))
255 checklist.append(OptCheck('DEBUG_CREDENTIALS', 'y', 'kspp', 'self_protection'))
256 checklist.append(OptCheck('DEBUG_NOTIFIERS', 'y', 'kspp', 'self_protection'))
257 hardened_usercopy_is_set = OptCheck('HARDENED_USERCOPY', 'y', 'kspp', 'self_protection')
258 checklist.append(hardened_usercopy_is_set)
259 checklist.append(AND(OptCheck('HARDENED_USERCOPY_FALLBACK', 'is not set', 'kspp', 'self_protection'), \
260 hardened_usercopy_is_set))
261 checklist.append(OR(OptCheck('MODULE_SIG', 'y', 'kspp', 'self_protection'), \
263 checklist.append(OR(OptCheck('MODULE_SIG_ALL', 'y', 'kspp', 'self_protection'), \
265 checklist.append(OR(OptCheck('MODULE_SIG_SHA512', 'y', 'kspp', 'self_protection'), \
267 checklist.append(OR(OptCheck('MODULE_SIG_FORCE', 'y', 'kspp', 'self_protection'), \
268 modules_not_set)) # refers to LOCK_DOWN_KERNEL
269 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
270 checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '65536', 'kspp', 'self_protection'))
271 checklist.append(OptCheck('REFCOUNT_FULL', 'y', 'kspp', 'self_protection'))
272 if debug_mode or arch == 'X86_32':
273 checklist.append(OptCheck('HIGHMEM64G', 'y', 'kspp', 'self_protection'))
274 checklist.append(OptCheck('X86_PAE', 'y', 'kspp', 'self_protection'))
275 if debug_mode or arch == 'ARM64':
276 checklist.append(OptCheck('ARM64_SW_TTBR0_PAN', 'y', 'kspp', 'self_protection'))
277 if debug_mode or arch == 'ARM64' or arch == 'ARM':
278 checklist.append(OptCheck('SYN_COOKIES', 'y', 'kspp', 'self_protection')) # another reason?
279 checklist.append(OptCheck('DEFAULT_MMAP_MIN_ADDR', '32768', 'kspp', 'self_protection'))
281 checklist.append(OR(OptCheck('INIT_STACK_ALL', 'y', 'clipos', 'self_protection'), \
282 OptCheck('GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y', 'kspp', 'self_protection')))
283 checklist.append(OptCheck('INIT_ON_ALLOC_DEFAULT_ON', 'y', 'clipos', 'self_protection'))
284 checklist.append(OR(OptCheck('INIT_ON_FREE_DEFAULT_ON', 'y', 'clipos', 'self_protection'), \
285 OptCheck('PAGE_POISONING', 'y', 'kspp', 'self_protection')))
286 checklist.append(OptCheck('SECURITY_DMESG_RESTRICT', 'y', 'clipos', 'self_protection'))
287 checklist.append(OptCheck('DEBUG_VIRTUAL', 'y', 'clipos', 'self_protection'))
288 checklist.append(OptCheck('STATIC_USERMODEHELPER', 'y', 'clipos', 'self_protection')) # needs userspace support (systemd)
289 checklist.append(OptCheck('SLAB_MERGE_DEFAULT', 'is not set', 'clipos', 'self_protection')) # slab_nomerge
290 checklist.append(AND(OptCheck('GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set', 'clipos', 'self_protection'), \
292 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
293 stackleak_is_set = OptCheck('GCC_PLUGIN_STACKLEAK', 'y', 'clipos', 'self_protection')
294 checklist.append(stackleak_is_set)
295 checklist.append(AND(OptCheck('STACKLEAK_METRICS', 'is not set', 'clipos', 'self_protection'), \
297 checklist.append(AND(OptCheck('STACKLEAK_RUNTIME_DISABLE', 'is not set', 'clipos', 'self_protection'), \
299 if debug_mode or arch == 'X86_64' or arch == 'X86_32':
300 checklist.append(OptCheck('RANDOM_TRUST_CPU', 'is not set', 'clipos', 'self_protection'))
301 checklist.append(AND(OptCheck('INTEL_IOMMU_SVM', 'y', 'clipos', 'self_protection'), \
302 iommu_support_is_set))
303 checklist.append(AND(OptCheck('INTEL_IOMMU_DEFAULT_ON', 'y', 'clipos', 'self_protection'), \
304 iommu_support_is_set))
306 checklist.append(OptCheck('SLUB_DEBUG_ON', 'y', 'my', 'self_protection'))
307 checklist.append(OptCheck('RESET_ATTACK_MITIGATION', 'y', 'my', 'self_protection')) # needs userspace support (systemd)
308 if debug_mode or arch == 'X86_64':
309 checklist.append(AND(OptCheck('AMD_IOMMU_V2', 'y', 'my', 'self_protection'), \
310 iommu_support_is_set))
311 if debug_mode or arch == 'X86_32':
312 checklist.append(OptCheck('PAGE_TABLE_ISOLATION', 'y', 'my', 'self_protection'))
314 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
315 checklist.append(OptCheck('SECURITY', 'y', 'defconfig', 'security_policy')) # and choose your favourite LSM
316 if debug_mode or arch == 'ARM':
317 checklist.append(OptCheck('SECURITY', 'y', 'kspp', 'security_policy')) # and choose your favourite LSM
318 checklist.append(OptCheck('SECURITY_YAMA', 'y', 'kspp', 'security_policy'))
319 checklist.append(OptCheck('SECURITY_LOADPIN', 'y', 'my', 'security_policy')) # needs userspace support
320 checklist.append(OptCheck('SECURITY_LOCKDOWN_LSM', 'y', 'my', 'security_policy'))
321 checklist.append(OptCheck('SECURITY_LOCKDOWN_LSM_EARLY', 'y', 'my', 'security_policy'))
322 checklist.append(OptCheck('LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY', 'y', 'my', 'security_policy'))
323 checklist.append(OptCheck('SECURITY_SAFESETID', 'y', 'my', 'security_policy'))
324 checklist.append(OptCheck('SECURITY_WRITABLE_HOOKS', 'is not set', 'my', 'security_policy'))
326 checklist.append(OptCheck('SECCOMP', 'y', 'defconfig', 'cut_attack_surface'))
327 checklist.append(OptCheck('SECCOMP_FILTER', 'y', 'defconfig', 'cut_attack_surface'))
328 if debug_mode or arch == 'X86_64' or arch == 'ARM64' or arch == 'X86_32':
329 checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'defconfig', 'cut_attack_surface'), \
330 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
332 checklist.append(modules_not_set)
333 checklist.append(devmem_not_set)
334 checklist.append(OR(OptCheck('IO_STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \
335 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
336 if debug_mode or arch == 'ARM':
337 checklist.append(OR(OptCheck('STRICT_DEVMEM', 'y', 'kspp', 'cut_attack_surface'), \
338 devmem_not_set)) # refers to LOCK_DOWN_KERNEL
339 checklist.append(OptCheck('ACPI_CUSTOM_METHOD', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
340 checklist.append(OptCheck('COMPAT_BRK', 'is not set', 'kspp', 'cut_attack_surface'))
341 checklist.append(OptCheck('DEVKMEM', 'is not set', 'kspp', 'cut_attack_surface'))
342 checklist.append(OptCheck('COMPAT_VDSO', 'is not set', 'kspp', 'cut_attack_surface'))
343 checklist.append(OptCheck('BINFMT_MISC', 'is not set', 'kspp', 'cut_attack_surface'))
344 checklist.append(OptCheck('INET_DIAG', 'is not set', 'kspp', 'cut_attack_surface'))
345 checklist.append(OptCheck('KEXEC', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
346 checklist.append(OptCheck('PROC_KCORE', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
347 checklist.append(OptCheck('LEGACY_PTYS', 'is not set', 'kspp', 'cut_attack_surface'))
348 checklist.append(OptCheck('HIBERNATION', 'is not set', 'kspp', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
349 if debug_mode or arch == 'X86_64':
350 checklist.append(OptCheck('LEGACY_VSYSCALL_NONE', 'y', 'kspp', 'cut_attack_surface')) # 'vsyscall=none'
351 checklist.append(OptCheck('IA32_EMULATION', 'is not set', 'kspp', 'cut_attack_surface'))
352 checklist.append(OptCheck('X86_X32', 'is not set', 'kspp', 'cut_attack_surface'))
353 checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'kspp', 'cut_attack_surface'))
354 if debug_mode or arch == 'ARM':
355 checklist.append(OptCheck('OABI_COMPAT', 'is not set', 'kspp', 'cut_attack_surface'))
357 checklist.append(OptCheck('X86_PTDUMP', 'is not set', 'grsecurity', 'cut_attack_surface'))
358 checklist.append(OptCheck('ZSMALLOC_STAT', 'is not set', 'grsecurity', 'cut_attack_surface'))
359 checklist.append(OptCheck('PAGE_OWNER', 'is not set', 'grsecurity', 'cut_attack_surface'))
360 checklist.append(OptCheck('DEBUG_KMEMLEAK', 'is not set', 'grsecurity', 'cut_attack_surface'))
361 checklist.append(OptCheck('BINFMT_AOUT', 'is not set', 'grsecurity', 'cut_attack_surface'))
362 checklist.append(OptCheck('KPROBES', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
363 checklist.append(OptCheck('UPROBES', 'is not set', 'grsecurity', 'cut_attack_surface'))
364 checklist.append(OptCheck('GENERIC_TRACER', 'is not set', 'grsecurity', 'cut_attack_surface'))
365 checklist.append(OptCheck('PROC_VMCORE', 'is not set', 'grsecurity', 'cut_attack_surface'))
366 checklist.append(OptCheck('PROC_PAGE_MONITOR', 'is not set', 'grsecurity', 'cut_attack_surface'))
367 checklist.append(OptCheck('USELIB', 'is not set', 'grsecurity', 'cut_attack_surface'))
368 checklist.append(OptCheck('CHECKPOINT_RESTORE', 'is not set', 'grsecurity', 'cut_attack_surface'))
369 checklist.append(OptCheck('USERFAULTFD', 'is not set', 'grsecurity', 'cut_attack_surface'))
370 checklist.append(OptCheck('HWPOISON_INJECT', 'is not set', 'grsecurity', 'cut_attack_surface'))
371 checklist.append(OptCheck('MEM_SOFT_DIRTY', 'is not set', 'grsecurity', 'cut_attack_surface'))
372 checklist.append(OptCheck('DEVPORT', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
373 checklist.append(OptCheck('DEBUG_FS', 'is not set', 'grsecurity', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
374 checklist.append(OptCheck('NOTIFIER_ERROR_INJECTION','is not set', 'grsecurity', 'cut_attack_surface'))
376 checklist.append(OptCheck('ACPI_TABLE_UPGRADE', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
377 checklist.append(OptCheck('ACPI_APEI_EINJ', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
378 checklist.append(OptCheck('PROFILING', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
379 checklist.append(OptCheck('BPF_SYSCALL', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
380 checklist.append(OptCheck('MMIOTRACE_TEST', 'is not set', 'lockdown', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL
382 checklist.append(OptCheck('KSM', 'is not set', 'clipos', 'cut_attack_surface')) # to prevent FLUSH+RELOAD attack
383 # checklist.append(OptCheck('IKCONFIG', 'is not set', 'clipos', 'cut_attack_surface')) # no, this info is needed for this check :)
384 checklist.append(OptCheck('KALLSYMS', 'is not set', 'clipos', 'cut_attack_surface'))
385 checklist.append(OptCheck('X86_VSYSCALL_EMULATION', 'is not set', 'clipos', 'cut_attack_surface'))
386 checklist.append(OptCheck('MAGIC_SYSRQ', 'is not set', 'clipos', 'cut_attack_surface'))
387 checklist.append(OptCheck('KEXEC_FILE', 'is not set', 'clipos', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
388 checklist.append(OptCheck('USER_NS', 'is not set', 'clipos', 'cut_attack_surface')) # user.max_user_namespaces=0
389 checklist.append(OptCheck('LDISC_AUTOLOAD', 'is not set', 'clipos', 'cut_attack_surface'))
391 checklist.append(OptCheck('MMIOTRACE', 'is not set', 'my', 'cut_attack_surface')) # refers to LOCK_DOWN_KERNEL (permissive)
392 checklist.append(OptCheck('LIVEPATCH', 'is not set', 'my', 'cut_attack_surface'))
393 checklist.append(OptCheck('IP_DCCP', 'is not set', 'my', 'cut_attack_surface'))
394 checklist.append(OptCheck('IP_SCTP', 'is not set', 'my', 'cut_attack_surface'))
395 checklist.append(OptCheck('FTRACE', 'is not set', 'my', 'cut_attack_surface'))
396 checklist.append(OptCheck('BPF_JIT', 'is not set', 'my', 'cut_attack_surface'))
397 checklist.append(OptCheck('VIDEO_VIVID', 'is not set', 'my', 'cut_attack_surface'))
398 if debug_mode or arch == 'X86_32':
399 checklist.append(OptCheck('MODIFY_LDT_SYSCALL', 'is not set', 'my', 'cut_attack_surface'))
401 if debug_mode or arch == 'ARM64':
402 checklist.append(OptCheck('ARM64_PTR_AUTH', 'y', 'defconfig', 'userspace_hardening'))
403 if debug_mode or arch == 'X86_64' or arch == 'ARM64':
404 checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '32', 'clipos', 'userspace_hardening'))
405 if debug_mode or arch == 'X86_32' or arch == 'ARM':
406 checklist.append(OptCheck('ARCH_MMAP_RND_BITS', '16', 'my', 'userspace_hardening'))
408 # checklist.append(OptCheck('LKDTM', 'm', 'my', 'feature_test'))
411 def print_checklist(checklist, with_results):
415 opt = ['CONFIG_'+o.name, o.expected, o.decision, o.reason]
419 print(json.dumps(opts))
423 print('{:^45}|{:^13}|{:^10}|{:^20}'.format('option name', 'desired val', 'decision', 'reason'), end='')
426 print('| {}'.format('check result'), end='')
430 print('=' * sep_line_len)
432 for opt in checklist:
433 print('CONFIG_{:<38}|{:^13}|{:^10}|{:^20}'.format(opt.name, opt.expected, opt.decision, opt.reason), end='')
435 print('| {}'.format(opt.result), end='')
440 def perform_checks(checklist, parsed_options):
441 for opt in checklist:
442 if hasattr(opt, 'opts'):
443 # prepare ComplexOptCheck
445 o.state = parsed_options.get(o.name, None)
448 opt.state = parsed_options.get(opt.name, None)
452 def check_config_file(checklist, fname):
453 with open(fname, 'r') as f:
454 parsed_options = OrderedDict()
455 opt_is_on = re.compile("CONFIG_[a-zA-Z0-9_]*=[a-zA-Z0-9_\"]*")
456 opt_is_off = re.compile("# CONFIG_[a-zA-Z0-9_]* is not set")
459 print('[+] Checking "{}" against hardening preferences...'.format(fname))
460 for line in f.readlines():
465 if opt_is_on.match(line):
466 option, value = line[7:].split('=', 1)
467 elif opt_is_off.match(line):
468 option, value = line[9:].split(' ', 1)
469 if value != 'is not set':
470 sys.exit('[!] ERROR: bad disabled config option "{}"'.format(line))
472 if option in parsed_options:
473 sys.exit('[!] ERROR: config option "{}" exists multiple times'.format(line))
475 if option is not None:
476 parsed_options[option] = value
478 perform_checks(checklist, parsed_options)
481 known_options = [opt.name for opt in checklist]
482 for option, value in parsed_options.items():
483 if option not in known_options:
484 print("DEBUG: dunno about option {} ({})".format(option, value))
486 print_checklist(checklist, True)
489 if __name__ == '__main__':
490 config_checklist = []
492 parser = ArgumentParser(description='Checks the hardening options in the Linux kernel config')
493 parser.add_argument('-p', '--print', choices=supported_archs,
494 help='print hardening preferences for selected architecture')
495 parser.add_argument('-c', '--config',
496 help='check the config_file against these preferences')
497 parser.add_argument('--debug', action='store_true',
498 help='enable internal debug mode')
499 parser.add_argument('--json', action='store_true',
500 help='print results in JSON format')
501 args = parser.parse_args()
507 if debug_mode and json_mode:
508 sys.exit('[!] ERROR: options --debug and --json cannot be used simultaneously')
511 arch, msg = detect_arch(args.config)
513 sys.exit('[!] ERROR: {}'.format(msg))
515 print('[+] Detected architecture: {}'.format(arch))
517 kernel_version, msg = detect_version(args.config)
518 if not kernel_version:
519 sys.exit('[!] ERROR: {}'.format(msg))
521 print('[+] Detected kernel version: {}.{}'.format(kernel_version[0], kernel_version[1]))
523 construct_checklist(config_checklist, arch)
524 check_config_file(config_checklist, args.config)
525 error_count = len(list(filter(lambda opt: opt.result.startswith('FAIL'), config_checklist)))
526 ok_count = len(list(filter(lambda opt: opt.result.startswith('OK'), config_checklist)))
530 print('[+] config check is finished: \'OK\' - {} / \'FAIL\' - {}'.format(ok_count, error_count))
535 construct_checklist(config_checklist, arch)
537 print('[+] Printing kernel hardening preferences for {}...'.format(arch))
538 print_checklist(config_checklist, False)