4 This tool helps me to check Linux kernel options against
5 my security 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 This module contains knowledge for checks.
13 # N.B. Hardening sysctls:
14 # kernel.kptr_restrict=2 (or 1?)
15 # kernel.dmesg_restrict=1 (also see the kconfig option)
16 # kernel.perf_event_paranoid=2 (or 3 with a custom patch, see https://lwn.net/Articles/696216/)
17 # kernel.kexec_load_disabled=1
18 # kernel.yama.ptrace_scope=3
19 # user.max_user_namespaces=0
20 # what about bpf_jit_enable?
21 # kernel.unprivileged_bpf_disabled=1
22 # net.core.bpf_jit_harden=2
23 # vm.unprivileged_userfaultfd=0
24 # (at first, it disabled unprivileged userfaultfd,
25 # and since v5.11 it enables unprivileged userfaultfd for user-mode only)
26 # vm.mmap_min_addr has a good value
27 # dev.tty.ldisc_autoload=0
28 # fs.protected_symlinks=1
29 # fs.protected_hardlinks=1
30 # fs.protected_fifos=2
31 # fs.protected_regular=2
33 # kernel.modules_disabled=1
34 # kernel.randomize_va_space=2
35 # nosmt sysfs control file
36 # dev.tty.legacy_tiocsti=0
37 # vm.mmap_rnd_bits=max (?)
40 # Think of these boot params:
41 # module.sig_enforce=1
42 # lockdown=confidentiality
47 # efi=disable_early_pci_dma
49 # pylint: disable=missing-function-docstring,line-too-long,invalid-name
50 # pylint: disable=too-many-branches,too-many-statements
52 from .engine import KconfigCheck, CmdlineCheck, VersionCheck, OR, AND
55 def add_kconfig_checks(l, arch):
56 # Calling the KconfigCheck class constructor:
57 # KconfigCheck(reason, decision, name, expected)
59 # [!] Don't add CmdlineChecks in add_kconfig_checks() to avoid wrong results
60 # when the tool doesn't check the cmdline.
62 efi_not_set = KconfigCheck('-', '-', 'EFI', 'is not set')
63 cc_is_gcc = KconfigCheck('-', '-', 'CC_IS_GCC', 'y') # exists since v4.18
64 cc_is_clang = KconfigCheck('-', '-', 'CC_IS_CLANG', 'y') # exists since v4.18
66 modules_not_set = KconfigCheck('cut_attack_surface', 'kspp', 'MODULES', 'is not set')
67 devmem_not_set = KconfigCheck('cut_attack_surface', 'kspp', 'DEVMEM', 'is not set') # refers to LOCKDOWN
68 bpf_syscall_not_set = KconfigCheck('cut_attack_surface', 'lockdown', 'BPF_SYSCALL', 'is not set') # refers to LOCKDOWN
70 # 'self_protection', 'defconfig'
71 l += [KconfigCheck('self_protection', 'defconfig', 'BUG', 'y')]
72 l += [KconfigCheck('self_protection', 'defconfig', 'SLUB_DEBUG', 'y')]
73 l += [KconfigCheck('self_protection', 'defconfig', 'THREAD_INFO_IN_TASK', 'y')]
74 gcc_plugins_support_is_set = KconfigCheck('self_protection', 'defconfig', 'GCC_PLUGINS', 'y')
75 l += [gcc_plugins_support_is_set]
76 iommu_support_is_set = KconfigCheck('self_protection', 'defconfig', 'IOMMU_SUPPORT', 'y')
77 l += [iommu_support_is_set] # is needed for mitigating DMA attacks
78 l += [OR(KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR', 'y'),
79 KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR', 'y'),
80 KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_REGULAR', 'y'),
81 KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_AUTO', 'y'),
82 KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_STRONG', 'y'))]
83 l += [OR(KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR_STRONG', 'y'),
84 KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_STRONG', 'y'))]
85 l += [OR(KconfigCheck('self_protection', 'defconfig', 'STRICT_KERNEL_RWX', 'y'),
86 KconfigCheck('self_protection', 'defconfig', 'DEBUG_RODATA', 'y'))] # before v4.11
87 l += [OR(KconfigCheck('self_protection', 'defconfig', 'STRICT_MODULE_RWX', 'y'),
88 KconfigCheck('self_protection', 'defconfig', 'DEBUG_SET_MODULE_RONX', 'y'),
89 modules_not_set)] # DEBUG_SET_MODULE_RONX was before v4.11
90 l += [OR(KconfigCheck('self_protection', 'defconfig', 'REFCOUNT_FULL', 'y'),
91 VersionCheck((5, 5)))] # REFCOUNT_FULL is enabled by default since v5.5
92 if arch in ('X86_64', 'ARM64', 'X86_32'):
93 l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_BASE', 'y')]
94 if arch in ('X86_64', 'ARM64', 'ARM'):
95 l += [KconfigCheck('self_protection', 'defconfig', 'VMAP_STACK', 'y')]
96 if arch in ('X86_64', 'X86_32'):
97 l += [KconfigCheck('self_protection', 'defconfig', 'DEBUG_WX', 'y')]
98 l += [KconfigCheck('self_protection', 'defconfig', 'WERROR', 'y')]
99 l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE', 'y')]
100 l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE_INTEL', 'y')]
101 l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE_AMD', 'y')]
102 l += [KconfigCheck('self_protection', 'defconfig', 'MICROCODE', 'y')] # is needed for mitigating CPU bugs
103 l += [KconfigCheck('self_protection', 'defconfig', 'RETPOLINE', 'y')]
104 l += [KconfigCheck('self_protection', 'defconfig', 'SYN_COOKIES', 'y')] # another reason?
105 l += [OR(KconfigCheck('self_protection', 'defconfig', 'X86_SMAP', 'y'),
106 VersionCheck((5, 19)))] # X86_SMAP is enabled by default since v5.19
107 l += [OR(KconfigCheck('self_protection', 'defconfig', 'X86_UMIP', 'y'),
108 KconfigCheck('self_protection', 'defconfig', 'X86_INTEL_UMIP', 'y'))]
109 if arch in ('ARM64', 'ARM'):
110 l += [KconfigCheck('self_protection', 'defconfig', 'IOMMU_DEFAULT_DMA_STRICT', 'y')]
111 l += [KconfigCheck('self_protection', 'defconfig', 'IOMMU_DEFAULT_PASSTHROUGH', 'is not set')] # true if IOMMU_DEFAULT_DMA_STRICT is set
112 l += [KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR_PER_TASK', 'y')]
114 l += [KconfigCheck('self_protection', 'defconfig', 'PAGE_TABLE_ISOLATION', 'y')]
115 l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_MEMORY', 'y')]
116 l += [AND(KconfigCheck('self_protection', 'defconfig', 'INTEL_IOMMU', 'y'),
117 iommu_support_is_set)]
118 l += [AND(KconfigCheck('self_protection', 'defconfig', 'AMD_IOMMU', 'y'),
119 iommu_support_is_set)]
121 l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_PAN', 'y')]
122 l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_EPAN', 'y')]
123 l += [KconfigCheck('self_protection', 'defconfig', 'UNMAP_KERNEL_AT_EL0', 'y')]
124 l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_E0PD', 'y')]
125 l += [KconfigCheck('self_protection', 'defconfig', 'RODATA_FULL_DEFAULT_ENABLED', 'y')]
126 l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_PTR_AUTH_KERNEL', 'y')]
127 l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_BTI_KERNEL', 'y')]
128 l += [KconfigCheck('self_protection', 'defconfig', 'MITIGATE_SPECTRE_BRANCH_HISTORY', 'y')]
129 l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_MTE', 'y')]
130 l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_MODULE_REGION_FULL', 'y')]
131 l += [OR(KconfigCheck('self_protection', 'defconfig', 'HARDEN_EL2_VECTORS', 'y'),
132 AND(KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_BASE', 'y'),
133 VersionCheck((5, 9))))] # HARDEN_EL2_VECTORS was included in RANDOMIZE_BASE in v5.9
134 l += [OR(KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_PREDICTOR', 'y'),
135 VersionCheck((5, 10)))] # HARDEN_BRANCH_PREDICTOR is enabled by default since v5.10
137 l += [KconfigCheck('self_protection', 'defconfig', 'CPU_SW_DOMAIN_PAN', 'y')]
138 l += [KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_PREDICTOR', 'y')]
139 l += [KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_HISTORY', 'y')]
140 l += [KconfigCheck('self_protection', 'defconfig', 'DEBUG_ALIGN_RODATA', 'y')]
142 # 'self_protection', 'kspp'
143 l += [KconfigCheck('self_protection', 'kspp', 'BUG_ON_DATA_CORRUPTION', 'y')]
144 l += [KconfigCheck('self_protection', 'kspp', 'SCHED_STACK_END_CHECK', 'y')]
145 l += [KconfigCheck('self_protection', 'kspp', 'SLAB_FREELIST_HARDENED', 'y')]
146 l += [KconfigCheck('self_protection', 'kspp', 'SLAB_FREELIST_RANDOM', 'y')]
147 l += [KconfigCheck('self_protection', 'kspp', 'SHUFFLE_PAGE_ALLOCATOR', 'y')]
148 l += [KconfigCheck('self_protection', 'kspp', 'FORTIFY_SOURCE', 'y')]
149 l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_LIST', 'y')]
150 l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_VIRTUAL', 'y')]
151 l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_SG', 'y')]
152 l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_CREDENTIALS', 'y')]
153 l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_NOTIFIERS', 'y')]
154 l += [KconfigCheck('self_protection', 'kspp', 'INIT_ON_ALLOC_DEFAULT_ON', 'y')]
155 l += [KconfigCheck('self_protection', 'kspp', 'KFENCE', 'y')]
156 l += [KconfigCheck('self_protection', 'kspp', 'ZERO_CALL_USED_REGS', 'y')]
157 l += [KconfigCheck('self_protection', 'kspp', 'HW_RANDOM_TPM', 'y')]
158 l += [KconfigCheck('self_protection', 'kspp', 'STATIC_USERMODEHELPER', 'y')] # needs userspace support
159 randstruct_is_set = OR(KconfigCheck('self_protection', 'kspp', 'RANDSTRUCT_FULL', 'y'),
160 KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_RANDSTRUCT', 'y'))
161 l += [randstruct_is_set]
162 l += [AND(KconfigCheck('self_protection', 'kspp', 'RANDSTRUCT_PERFORMANCE', 'is not set'),
163 KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set'),
165 hardened_usercopy_is_set = KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY', 'y')
166 l += [hardened_usercopy_is_set]
167 l += [AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'),
168 hardened_usercopy_is_set)]
169 l += [AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_PAGESPAN', 'is not set'),
170 hardened_usercopy_is_set)]
171 l += [AND(KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_LATENT_ENTROPY', 'y'),
172 gcc_plugins_support_is_set)]
173 l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG', 'y'),
175 l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG_ALL', 'y'),
177 l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG_SHA512', 'y'),
179 l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG_FORCE', 'y'),
180 modules_not_set)] # refers to LOCKDOWN
181 l += [OR(KconfigCheck('self_protection', 'kspp', 'INIT_STACK_ALL_ZERO', 'y'),
182 KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y'))]
183 l += [OR(KconfigCheck('self_protection', 'kspp', 'INIT_ON_FREE_DEFAULT_ON', 'y'),
184 KconfigCheck('self_protection', 'kspp', 'PAGE_POISONING_ZERO', 'y'))]
185 # CONFIG_INIT_ON_FREE_DEFAULT_ON was added in v5.3.
186 # CONFIG_PAGE_POISONING_ZERO was removed in v5.11.
187 # Starting from v5.11 CONFIG_PAGE_POISONING unconditionally checks
188 # the 0xAA poison pattern on allocation.
189 # That brings higher performance penalty.
190 l += [OR(KconfigCheck('self_protection', 'kspp', 'EFI_DISABLE_PCI_DMA', 'y'),
192 l += [OR(KconfigCheck('self_protection', 'kspp', 'RESET_ATTACK_MITIGATION', 'y'),
193 efi_not_set)] # needs userspace support (systemd)
194 ubsan_bounds_is_set = KconfigCheck('self_protection', 'kspp', 'UBSAN_BOUNDS', 'y')
195 l += [ubsan_bounds_is_set]
196 l += [OR(KconfigCheck('self_protection', 'kspp', 'UBSAN_LOCAL_BOUNDS', 'y'),
197 AND(ubsan_bounds_is_set,
199 l += [AND(KconfigCheck('self_protection', 'kspp', 'UBSAN_TRAP', 'y'),
201 KconfigCheck('self_protection', 'kspp', 'UBSAN_SHIFT', 'is not set'),
202 KconfigCheck('self_protection', 'kspp', 'UBSAN_DIV_ZERO', 'is not set'),
203 KconfigCheck('self_protection', 'kspp', 'UBSAN_UNREACHABLE', 'is not set'),
204 KconfigCheck('self_protection', 'kspp', 'UBSAN_BOOL', 'is not set'),
205 KconfigCheck('self_protection', 'kspp', 'UBSAN_ENUM', 'is not set'),
206 KconfigCheck('self_protection', 'kspp', 'UBSAN_ALIGNMENT', 'is not set'))] # only array index bounds checking with traps
207 if arch in ('X86_64', 'ARM64', 'X86_32'):
208 l += [AND(KconfigCheck('self_protection', 'kspp', 'UBSAN_SANITIZE_ALL', 'y'),
209 ubsan_bounds_is_set)] # ARCH_HAS_UBSAN_SANITIZE_ALL is not enabled for ARM
210 stackleak_is_set = KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_STACKLEAK', 'y')
211 l += [AND(stackleak_is_set, gcc_plugins_support_is_set)]
212 l += [AND(KconfigCheck('self_protection', 'kspp', 'STACKLEAK_METRICS', 'is not set'),
214 gcc_plugins_support_is_set)]
215 l += [AND(KconfigCheck('self_protection', 'kspp', 'STACKLEAK_RUNTIME_DISABLE', 'is not set'),
217 gcc_plugins_support_is_set)]
218 l += [KconfigCheck('self_protection', 'kspp', 'RANDOMIZE_KSTACK_OFFSET_DEFAULT', 'y')]
219 if arch in ('X86_64', 'ARM64'):
220 cfi_clang_is_set = KconfigCheck('self_protection', 'kspp', 'CFI_CLANG', 'y')
221 l += [cfi_clang_is_set]
222 l += [AND(KconfigCheck('self_protection', 'kspp', 'CFI_PERMISSIVE', 'is not set'),
224 if arch in ('X86_64', 'X86_32'):
225 l += [KconfigCheck('self_protection', 'kspp', 'SCHED_CORE', 'y')]
226 l += [KconfigCheck('self_protection', 'kspp', 'DEFAULT_MMAP_MIN_ADDR', '65536')]
227 l += [KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_DMA_STRICT', 'y')]
228 l += [KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_PASSTHROUGH', 'is not set')] # true if IOMMU_DEFAULT_DMA_STRICT is set
229 l += [AND(KconfigCheck('self_protection', 'kspp', 'INTEL_IOMMU_DEFAULT_ON', 'y'),
230 iommu_support_is_set)]
231 if arch in ('ARM64', 'ARM'):
232 l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_WX', 'y')]
233 l += [KconfigCheck('self_protection', 'kspp', 'WERROR', 'y')]
234 l += [KconfigCheck('self_protection', 'kspp', 'DEFAULT_MMAP_MIN_ADDR', '32768')]
235 l += [KconfigCheck('self_protection', 'kspp', 'SYN_COOKIES', 'y')] # another reason?
237 l += [KconfigCheck('self_protection', 'kspp', 'SLS', 'y')] # vs CVE-2021-26341 in Straight-Line-Speculation
238 l += [AND(KconfigCheck('self_protection', 'kspp', 'INTEL_IOMMU_SVM', 'y'),
239 iommu_support_is_set)]
240 l += [AND(KconfigCheck('self_protection', 'kspp', 'AMD_IOMMU_V2', 'y'),
241 iommu_support_is_set)]
243 l += [KconfigCheck('self_protection', 'kspp', 'ARM64_SW_TTBR0_PAN', 'y')]
244 l += [KconfigCheck('self_protection', 'kspp', 'SHADOW_CALL_STACK', 'y')]
245 l += [KconfigCheck('self_protection', 'kspp', 'KASAN_HW_TAGS', 'y')] # see also: kasan=on, kasan.stacktrace=off, kasan.fault=panic
247 l += [KconfigCheck('self_protection', 'kspp', 'PAGE_TABLE_ISOLATION', 'y')]
248 l += [KconfigCheck('self_protection', 'kspp', 'HIGHMEM64G', 'y')]
249 l += [KconfigCheck('self_protection', 'kspp', 'X86_PAE', 'y')]
250 l += [AND(KconfigCheck('self_protection', 'kspp', 'INTEL_IOMMU', 'y'),
251 iommu_support_is_set)]
253 # 'self_protection', 'clipos'
254 l += [KconfigCheck('self_protection', 'clipos', 'SLAB_MERGE_DEFAULT', 'is not set')]
257 if arch in ('X86_64', 'ARM64', 'X86_32'):
258 l += [KconfigCheck('security_policy', 'defconfig', 'SECURITY', 'y')]
260 l += [KconfigCheck('security_policy', 'kspp', 'SECURITY', 'y')]
261 l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_YAMA', 'y')]
262 l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_LANDLOCK', 'y')]
263 l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_SELINUX_DISABLE', 'is not set')]
264 l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_SELINUX_BOOTPARAM', 'is not set')]
265 l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_SELINUX_DEVELOP', 'is not set')]
266 l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_LOCKDOWN_LSM', 'y')]
267 l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_LOCKDOWN_LSM_EARLY', 'y')]
268 l += [KconfigCheck('security_policy', 'kspp', 'LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY', 'y')]
269 l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_WRITABLE_HOOKS', 'is not set')] # refers to SECURITY_SELINUX_DISABLE
270 l += [OR(KconfigCheck('security_policy', 'my', 'SECURITY_SELINUX', 'y'),
271 KconfigCheck('security_policy', 'my', 'SECURITY_APPARMOR', 'y'),
272 KconfigCheck('security_policy', 'my', 'SECURITY_SMACK', 'y'),
273 KconfigCheck('security_policy', 'my', 'SECURITY_TOMOYO', 'y'))] # one of major LSMs implementing MAC
275 # 'cut_attack_surface', 'defconfig'
276 l += [KconfigCheck('cut_attack_surface', 'defconfig', 'SECCOMP', 'y')]
277 l += [KconfigCheck('cut_attack_surface', 'defconfig', 'SECCOMP_FILTER', 'y')]
278 l += [OR(KconfigCheck('cut_attack_surface', 'defconfig', 'BPF_UNPRIV_DEFAULT_OFF', 'y'),
279 bpf_syscall_not_set)] # see unprivileged_bpf_disabled
280 if arch in ('X86_64', 'ARM64', 'X86_32'):
281 l += [OR(KconfigCheck('cut_attack_surface', 'defconfig', 'STRICT_DEVMEM', 'y'),
282 devmem_not_set)] # refers to LOCKDOWN
283 if arch in ('X86_64', 'X86_32'):
284 l += [KconfigCheck('cut_attack_surface', 'defconfig', 'X86_INTEL_TSX_MODE_OFF', 'y')] # tsx=off
286 # 'cut_attack_surface', 'kspp'
287 l += [KconfigCheck('cut_attack_surface', 'kspp', 'SECURITY_DMESG_RESTRICT', 'y')]
288 l += [KconfigCheck('cut_attack_surface', 'kspp', 'ACPI_CUSTOM_METHOD', 'is not set')] # refers to LOCKDOWN
289 l += [KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT_BRK', 'is not set')]
290 l += [KconfigCheck('cut_attack_surface', 'kspp', 'DEVKMEM', 'is not set')] # refers to LOCKDOWN
291 l += [KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT_VDSO', 'is not set')]
292 l += [KconfigCheck('cut_attack_surface', 'kspp', 'BINFMT_MISC', 'is not set')]
293 l += [KconfigCheck('cut_attack_surface', 'kspp', 'INET_DIAG', 'is not set')]
294 l += [KconfigCheck('cut_attack_surface', 'kspp', 'KEXEC', 'is not set')] # refers to LOCKDOWN
295 l += [KconfigCheck('cut_attack_surface', 'kspp', 'PROC_KCORE', 'is not set')] # refers to LOCKDOWN
296 l += [KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_PTYS', 'is not set')]
297 l += [KconfigCheck('cut_attack_surface', 'kspp', 'HIBERNATION', 'is not set')] # refers to LOCKDOWN
298 l += [KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT', 'is not set')]
299 l += [KconfigCheck('cut_attack_surface', 'kspp', 'IA32_EMULATION', 'is not set')]
300 l += [KconfigCheck('cut_attack_surface', 'kspp', 'X86_X32', 'is not set')]
301 l += [KconfigCheck('cut_attack_surface', 'kspp', 'X86_X32_ABI', 'is not set')]
302 l += [KconfigCheck('cut_attack_surface', 'kspp', 'MODIFY_LDT_SYSCALL', 'is not set')]
303 l += [KconfigCheck('cut_attack_surface', 'kspp', 'OABI_COMPAT', 'is not set')]
304 l += [KconfigCheck('cut_attack_surface', 'kspp', 'X86_MSR', 'is not set')] # refers to LOCKDOWN
305 l += [modules_not_set]
306 l += [devmem_not_set]
307 l += [OR(KconfigCheck('cut_attack_surface', 'kspp', 'IO_STRICT_DEVMEM', 'y'),
308 devmem_not_set)] # refers to LOCKDOWN
309 l += [AND(KconfigCheck('cut_attack_surface', 'kspp', 'LDISC_AUTOLOAD', 'is not set'),
310 KconfigCheck('cut_attack_surface', 'kspp', 'LDISC_AUTOLOAD', 'is present'))]
312 l += [KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_VSYSCALL_NONE', 'y')] # 'vsyscall=none'
314 l += [OR(KconfigCheck('cut_attack_surface', 'kspp', 'STRICT_DEVMEM', 'y'),
315 devmem_not_set)] # refers to LOCKDOWN
317 # 'cut_attack_surface', 'grsec'
318 l += [KconfigCheck('cut_attack_surface', 'grsec', 'ZSMALLOC_STAT', 'is not set')]
319 l += [KconfigCheck('cut_attack_surface', 'grsec', 'PAGE_OWNER', 'is not set')]
320 l += [KconfigCheck('cut_attack_surface', 'grsec', 'DEBUG_KMEMLEAK', 'is not set')]
321 l += [KconfigCheck('cut_attack_surface', 'grsec', 'BINFMT_AOUT', 'is not set')]
322 l += [KconfigCheck('cut_attack_surface', 'grsec', 'KPROBE_EVENTS', 'is not set')]
323 l += [KconfigCheck('cut_attack_surface', 'grsec', 'UPROBE_EVENTS', 'is not set')]
324 l += [KconfigCheck('cut_attack_surface', 'grsec', 'GENERIC_TRACER', 'is not set')] # refers to LOCKDOWN
325 l += [KconfigCheck('cut_attack_surface', 'grsec', 'FUNCTION_TRACER', 'is not set')]
326 l += [KconfigCheck('cut_attack_surface', 'grsec', 'STACK_TRACER', 'is not set')]
327 l += [KconfigCheck('cut_attack_surface', 'grsec', 'HIST_TRIGGERS', 'is not set')]
328 l += [KconfigCheck('cut_attack_surface', 'grsec', 'BLK_DEV_IO_TRACE', 'is not set')]
329 l += [KconfigCheck('cut_attack_surface', 'grsec', 'PROC_VMCORE', 'is not set')]
330 l += [KconfigCheck('cut_attack_surface', 'grsec', 'PROC_PAGE_MONITOR', 'is not set')]
331 l += [KconfigCheck('cut_attack_surface', 'grsec', 'USELIB', 'is not set')]
332 l += [KconfigCheck('cut_attack_surface', 'grsec', 'CHECKPOINT_RESTORE', 'is not set')]
333 l += [KconfigCheck('cut_attack_surface', 'grsec', 'USERFAULTFD', 'is not set')]
334 l += [KconfigCheck('cut_attack_surface', 'grsec', 'HWPOISON_INJECT', 'is not set')]
335 l += [KconfigCheck('cut_attack_surface', 'grsec', 'MEM_SOFT_DIRTY', 'is not set')]
336 l += [KconfigCheck('cut_attack_surface', 'grsec', 'DEVPORT', 'is not set')] # refers to LOCKDOWN
337 l += [KconfigCheck('cut_attack_surface', 'grsec', 'DEBUG_FS', 'is not set')] # refers to LOCKDOWN
338 l += [KconfigCheck('cut_attack_surface', 'grsec', 'NOTIFIER_ERROR_INJECTION', 'is not set')]
339 l += [KconfigCheck('cut_attack_surface', 'grsec', 'FAIL_FUTEX', 'is not set')]
340 l += [KconfigCheck('cut_attack_surface', 'grsec', 'PUNIT_ATOM_DEBUG', 'is not set')]
341 l += [KconfigCheck('cut_attack_surface', 'grsec', 'ACPI_CONFIGFS', 'is not set')]
342 l += [KconfigCheck('cut_attack_surface', 'grsec', 'EDAC_DEBUG', 'is not set')]
343 l += [KconfigCheck('cut_attack_surface', 'grsec', 'DRM_I915_DEBUG', 'is not set')]
344 l += [KconfigCheck('cut_attack_surface', 'grsec', 'BCACHE_CLOSURES_DEBUG', 'is not set')]
345 l += [KconfigCheck('cut_attack_surface', 'grsec', 'DVB_C8SECTPFE', 'is not set')]
346 l += [KconfigCheck('cut_attack_surface', 'grsec', 'MTD_SLRAM', 'is not set')]
347 l += [KconfigCheck('cut_attack_surface', 'grsec', 'MTD_PHRAM', 'is not set')]
348 l += [KconfigCheck('cut_attack_surface', 'grsec', 'IO_URING', 'is not set')]
349 l += [KconfigCheck('cut_attack_surface', 'grsec', 'KCMP', 'is not set')]
350 l += [KconfigCheck('cut_attack_surface', 'grsec', 'RSEQ', 'is not set')]
351 l += [KconfigCheck('cut_attack_surface', 'grsec', 'LATENCYTOP', 'is not set')]
352 l += [KconfigCheck('cut_attack_surface', 'grsec', 'KCOV', 'is not set')]
353 l += [KconfigCheck('cut_attack_surface', 'grsec', 'PROVIDE_OHCI1394_DMA_INIT', 'is not set')]
354 l += [KconfigCheck('cut_attack_surface', 'grsec', 'SUNRPC_DEBUG', 'is not set')]
355 l += [AND(KconfigCheck('cut_attack_surface', 'grsec', 'PTDUMP_DEBUGFS', 'is not set'),
356 KconfigCheck('cut_attack_surface', 'grsec', 'X86_PTDUMP', 'is not set'))]
358 # 'cut_attack_surface', 'maintainer'
359 l += [KconfigCheck('cut_attack_surface', 'maintainer', 'DRM_LEGACY', 'is not set')] # recommended by Daniel Vetter in /issues/38
360 l += [KconfigCheck('cut_attack_surface', 'maintainer', 'FB', 'is not set')] # recommended by Daniel Vetter in /issues/38
361 l += [KconfigCheck('cut_attack_surface', 'maintainer', 'VT', 'is not set')] # recommended by Daniel Vetter in /issues/38
362 l += [KconfigCheck('cut_attack_surface', 'maintainer', 'BLK_DEV_FD', 'is not set')] # recommended by Denis Efremov in /pull/54
363 l += [KconfigCheck('cut_attack_surface', 'maintainer', 'BLK_DEV_FD_RAWCMD', 'is not set')] # recommended by Denis Efremov in /pull/62
364 l += [KconfigCheck('cut_attack_surface', 'maintainer', 'NOUVEAU_LEGACY_CTX_SUPPORT', 'is not set')]
365 # recommended by Dave Airlie in kernel commit b30a43ac7132cdda
367 # 'cut_attack_surface', 'clipos'
368 l += [KconfigCheck('cut_attack_surface', 'clipos', 'STAGING', 'is not set')]
369 l += [KconfigCheck('cut_attack_surface', 'clipos', 'KSM', 'is not set')] # to prevent FLUSH+RELOAD attack
370 l += [KconfigCheck('cut_attack_surface', 'clipos', 'KALLSYMS', 'is not set')]
371 l += [KconfigCheck('cut_attack_surface', 'clipos', 'X86_VSYSCALL_EMULATION', 'is not set')]
372 l += [KconfigCheck('cut_attack_surface', 'clipos', 'MAGIC_SYSRQ', 'is not set')]
373 l += [KconfigCheck('cut_attack_surface', 'clipos', 'KEXEC_FILE', 'is not set')] # refers to LOCKDOWN (permissive)
374 l += [KconfigCheck('cut_attack_surface', 'clipos', 'USER_NS', 'is not set')] # user.max_user_namespaces=0
375 l += [KconfigCheck('cut_attack_surface', 'clipos', 'X86_CPUID', 'is not set')]
376 l += [KconfigCheck('cut_attack_surface', 'clipos', 'X86_IOPL_IOPERM', 'is not set')] # refers to LOCKDOWN
377 l += [KconfigCheck('cut_attack_surface', 'clipos', 'ACPI_TABLE_UPGRADE', 'is not set')] # refers to LOCKDOWN
378 l += [KconfigCheck('cut_attack_surface', 'clipos', 'EFI_CUSTOM_SSDT_OVERLAYS', 'is not set')]
379 l += [KconfigCheck('cut_attack_surface', 'clipos', 'COREDUMP', 'is not set')] # cut userspace attack surface
380 # l += [KconfigCheck('cut_attack_surface', 'clipos', 'IKCONFIG', 'is not set')] # no, IKCONFIG is needed for this check :)
382 # 'cut_attack_surface', 'lockdown'
383 l += [KconfigCheck('cut_attack_surface', 'lockdown', 'EFI_TEST', 'is not set')] # refers to LOCKDOWN
384 l += [KconfigCheck('cut_attack_surface', 'lockdown', 'MMIOTRACE_TEST', 'is not set')] # refers to LOCKDOWN
385 l += [KconfigCheck('cut_attack_surface', 'lockdown', 'KPROBES', 'is not set')] # refers to LOCKDOWN
386 l += [bpf_syscall_not_set] # refers to LOCKDOWN
388 # 'cut_attack_surface', 'my'
389 l += [KconfigCheck('cut_attack_surface', 'my', 'LEGACY_TIOCSTI', 'is not set')]
390 l += [KconfigCheck('cut_attack_surface', 'my', 'MMIOTRACE', 'is not set')] # refers to LOCKDOWN (permissive)
391 l += [KconfigCheck('cut_attack_surface', 'my', 'LIVEPATCH', 'is not set')]
392 l += [KconfigCheck('cut_attack_surface', 'my', 'IP_DCCP', 'is not set')]
393 l += [KconfigCheck('cut_attack_surface', 'my', 'IP_SCTP', 'is not set')]
394 l += [KconfigCheck('cut_attack_surface', 'my', 'FTRACE', 'is not set')] # refers to LOCKDOWN
395 l += [KconfigCheck('cut_attack_surface', 'my', 'VIDEO_VIVID', 'is not set')]
396 l += [KconfigCheck('cut_attack_surface', 'my', 'INPUT_EVBUG', 'is not set')] # Can be used as a keylogger
397 l += [KconfigCheck('cut_attack_surface', 'my', 'KGDB', 'is not set')]
398 l += [KconfigCheck('cut_attack_surface', 'my', 'AIO', 'is not set')]
399 l += [KconfigCheck('cut_attack_surface', 'my', 'CORESIGHT', 'is not set')]
400 l += [OR(KconfigCheck('cut_attack_surface', 'my', 'TRIM_UNUSED_KSYMS', 'y'),
405 l += [KconfigCheck('harden_userspace', 'defconfig', 'ARM64_PTR_AUTH', 'y')]
406 l += [KconfigCheck('harden_userspace', 'defconfig', 'ARM64_BTI', 'y')]
407 if arch in ('ARM', 'X86_32'):
408 l += [KconfigCheck('harden_userspace', 'defconfig', 'VMSPLIT_3G', 'y')]
409 l += [KconfigCheck('harden_userspace', 'my', 'ARCH_MMAP_RND_BITS', 'MAX')] # 'MAX' value is refined using ARCH_MMAP_RND_BITS_MAX
412 def add_cmdline_checks(l, arch):
413 # Calling the CmdlineCheck class constructor:
414 # CmdlineCheck(reason, decision, name, expected)
416 # [!] Don't add CmdlineChecks in add_kconfig_checks() to avoid wrong results
417 # when the tool doesn't check the cmdline.
419 # [!] Make sure that values of the options in CmdlineChecks need normalization.
420 # For more info see normalize_cmdline_options().
422 # A common pattern for checking the 'param_x' cmdline parameter
423 # that __overrides__ the 'PARAM_X_DEFAULT' kconfig option:
424 # l += [OR(CmdlineCheck(reason, decision, 'param_x', '1'),
425 # AND(KconfigCheck(reason, decision, 'PARAM_X_DEFAULT_ON', 'y'),
426 # CmdlineCheck(reason, decision, 'param_x, 'is not set')))]
428 # Here we don't check the kconfig options or minimal kernel version
429 # required for the cmdline parameters. That would make the checks
430 # very complex and not give a 100% guarantee anyway.
432 # 'self_protection', 'defconfig'
433 l += [CmdlineCheck('self_protection', 'defconfig', 'nosmep', 'is not set')]
434 l += [CmdlineCheck('self_protection', 'defconfig', 'nosmap', 'is not set')]
435 l += [CmdlineCheck('self_protection', 'defconfig', 'nokaslr', 'is not set')]
436 l += [CmdlineCheck('self_protection', 'defconfig', 'nopti', 'is not set')]
437 l += [CmdlineCheck('self_protection', 'defconfig', 'nospectre_v1', 'is not set')]
438 l += [CmdlineCheck('self_protection', 'defconfig', 'nospectre_v2', 'is not set')]
439 l += [CmdlineCheck('self_protection', 'defconfig', 'nospectre_bhb', 'is not set')]
440 l += [CmdlineCheck('self_protection', 'defconfig', 'nospec_store_bypass_disable', 'is not set')]
441 l += [CmdlineCheck('self_protection', 'defconfig', 'arm64.nobti', 'is not set')]
442 l += [CmdlineCheck('self_protection', 'defconfig', 'arm64.nopauth', 'is not set')]
443 l += [CmdlineCheck('self_protection', 'defconfig', 'arm64.nomte', 'is not set')]
444 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'spectre_v2', 'is not off'),
445 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
446 CmdlineCheck('self_protection', 'defconfig', 'spectre_v2', 'is not set')))]
447 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'spectre_v2_user', 'is not off'),
448 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
449 CmdlineCheck('self_protection', 'defconfig', 'spectre_v2_user', 'is not set')))]
450 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'spec_store_bypass_disable', 'is not off'),
451 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
452 CmdlineCheck('self_protection', 'defconfig', 'spec_store_bypass_disable', 'is not set')))]
453 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'l1tf', 'is not off'),
454 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
455 CmdlineCheck('self_protection', 'defconfig', 'l1tf', 'is not set')))]
456 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'mds', 'is not off'),
457 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
458 CmdlineCheck('self_protection', 'defconfig', 'mds', 'is not set')))]
459 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'tsx_async_abort', 'is not off'),
460 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
461 CmdlineCheck('self_protection', 'defconfig', 'tsx_async_abort', 'is not set')))]
462 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'srbds', 'is not off'),
463 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
464 CmdlineCheck('self_protection', 'defconfig', 'srbds', 'is not set')))]
465 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'mmio_stale_data', 'is not off'),
466 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
467 CmdlineCheck('self_protection', 'defconfig', 'mmio_stale_data', 'is not set')))]
468 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'retbleed', 'is not off'),
469 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
470 CmdlineCheck('self_protection', 'defconfig', 'retbleed', 'is not set')))]
471 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'kpti', 'is not off'),
472 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
473 CmdlineCheck('self_protection', 'defconfig', 'kpti', 'is not set')))]
475 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'ssbd', 'kernel'),
476 CmdlineCheck('self_protection', 'my', 'ssbd', 'force-on'),
477 AND(CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt'),
478 CmdlineCheck('self_protection', 'defconfig', 'ssbd', 'is not set')))]
479 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'rodata', 'full'),
480 AND(KconfigCheck('self_protection', 'defconfig', 'RODATA_FULL_DEFAULT_ENABLED', 'y'),
481 CmdlineCheck('self_protection', 'defconfig', 'rodata', 'is not set')))]
483 l += [OR(CmdlineCheck('self_protection', 'defconfig', 'rodata', '1'),
484 CmdlineCheck('self_protection', 'defconfig', 'rodata', 'is not set'))]
486 # 'self_protection', 'kspp'
487 l += [CmdlineCheck('self_protection', 'kspp', 'nosmt', 'is present')]
488 l += [CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt')] # 'nosmt' by kspp + 'auto' by defconfig
489 l += [CmdlineCheck('self_protection', 'kspp', 'slab_merge', 'is not set')] # consequence of 'slab_nomerge' by kspp
490 l += [CmdlineCheck('self_protection', 'kspp', 'slub_merge', 'is not set')] # consequence of 'slab_nomerge' by kspp
491 l += [OR(CmdlineCheck('self_protection', 'kspp', 'slab_nomerge', 'is present'),
492 AND(KconfigCheck('self_protection', 'clipos', 'SLAB_MERGE_DEFAULT', 'is not set'),
493 CmdlineCheck('self_protection', 'kspp', 'slab_merge', 'is not set'),
494 CmdlineCheck('self_protection', 'kspp', 'slub_merge', 'is not set')))]
495 l += [OR(CmdlineCheck('self_protection', 'kspp', 'init_on_alloc', '1'),
496 AND(KconfigCheck('self_protection', 'kspp', 'INIT_ON_ALLOC_DEFAULT_ON', 'y'),
497 CmdlineCheck('self_protection', 'kspp', 'init_on_alloc', 'is not set')))]
498 l += [OR(CmdlineCheck('self_protection', 'kspp', 'init_on_free', '1'),
499 AND(KconfigCheck('self_protection', 'kspp', 'INIT_ON_FREE_DEFAULT_ON', 'y'),
500 CmdlineCheck('self_protection', 'kspp', 'init_on_free', 'is not set')),
501 AND(CmdlineCheck('self_protection', 'kspp', 'page_poison', '1'),
502 KconfigCheck('self_protection', 'kspp', 'PAGE_POISONING_ZERO', 'y'),
503 CmdlineCheck('self_protection', 'kspp', 'slub_debug', 'P')))]
504 l += [OR(CmdlineCheck('self_protection', 'kspp', 'iommu.strict', '1'),
505 AND(KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_DMA_STRICT', 'y'),
506 CmdlineCheck('self_protection', 'kspp', 'iommu.strict', 'is not set')))]
507 l += [OR(CmdlineCheck('self_protection', 'kspp', 'iommu.passthrough', '0'),
508 AND(KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_PASSTHROUGH', 'is not set'),
509 CmdlineCheck('self_protection', 'kspp', 'iommu.passthrough', 'is not set')))]
510 # The cmdline checks compatible with the kconfig recommendations of the KSPP project...
511 l += [OR(CmdlineCheck('self_protection', 'kspp', 'hardened_usercopy', '1'),
512 AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY', 'y'),
513 CmdlineCheck('self_protection', 'kspp', 'hardened_usercopy', 'is not set')))]
514 l += [OR(CmdlineCheck('self_protection', 'kspp', 'slab_common.usercopy_fallback', '0'),
515 AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'),
516 CmdlineCheck('self_protection', 'kspp', 'slab_common.usercopy_fallback', 'is not set')))]
518 if arch in ('X86_64', 'ARM64', 'X86_32'):
519 l += [OR(CmdlineCheck('self_protection', 'kspp', 'randomize_kstack_offset', '1'),
520 AND(KconfigCheck('self_protection', 'kspp', 'RANDOMIZE_KSTACK_OFFSET_DEFAULT', 'y'),
521 CmdlineCheck('self_protection', 'kspp', 'randomize_kstack_offset', 'is not set')))]
522 if arch in ('X86_64', 'X86_32'):
523 l += [AND(CmdlineCheck('self_protection', 'kspp', 'pti', 'on'),
524 CmdlineCheck('self_protection', 'defconfig', 'nopti', 'is not set'))]
526 # 'self_protection', 'clipos'
527 l += [CmdlineCheck('self_protection', 'clipos', 'page_alloc.shuffle', '1')]
528 if arch in ('X86_64', 'X86_32'):
529 l += [CmdlineCheck('self_protection', 'clipos', 'iommu', 'force')]
531 # 'cut_attack_surface', 'defconfig'
532 if arch in ('X86_64', 'X86_32'):
533 l += [OR(CmdlineCheck('cut_attack_surface', 'defconfig', 'tsx', 'off'),
534 AND(KconfigCheck('cut_attack_surface', 'defconfig', 'X86_INTEL_TSX_MODE_OFF', 'y'),
535 CmdlineCheck('cut_attack_surface', 'defconfig', 'tsx', 'is not set')))]
537 # 'cut_attack_surface', 'kspp'
539 l += [OR(CmdlineCheck('cut_attack_surface', 'kspp', 'vsyscall', 'none'),
540 AND(KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_VSYSCALL_NONE', 'y'),
541 CmdlineCheck('cut_attack_surface', 'kspp', 'vsyscall', 'is not set')))]
543 # 'cut_attack_surface', 'grsec'
544 # The cmdline checks compatible with the kconfig options disabled by grsecurity...
545 l += [OR(CmdlineCheck('cut_attack_surface', 'grsec', 'debugfs', 'off'),
546 KconfigCheck('cut_attack_surface', 'grsec', 'DEBUG_FS', 'is not set'))] # ... the end
548 # 'cut_attack_surface', 'my'
549 l += [CmdlineCheck('cut_attack_surface', 'my', 'sysrq_always_enabled', 'is not set')]
552 l += [CmdlineCheck('harden_userspace', 'defconfig', 'norandmaps', 'is not set')]
555 no_kstrtobool_options = [
556 'debugfs', # See debugfs_kernel() in fs/debugfs/inode.c
557 'mitigations', # See mitigations_parse_cmdline() in kernel/cpu.c
558 'pti', # See pti_check_boottime_disable() in arch/x86/mm/pti.c
559 'spectre_v2', # See spectre_v2_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
560 'spectre_v2_user', # See spectre_v2_parse_user_cmdline() in arch/x86/kernel/cpu/bugs.c
561 'spec_store_bypass_disable', # See ssb_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
562 'l1tf', # See l1tf_cmdline() in arch/x86/kernel/cpu/bugs.c
563 'mds', # See mds_cmdline() in arch/x86/kernel/cpu/bugs.c
564 'tsx_async_abort', # See tsx_async_abort_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
565 'srbds', # See srbds_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
566 'mmio_stale_data', # See mmio_stale_data_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
567 'retbleed', # See retbleed_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
568 'tsx' # See tsx_init() in arch/x86/kernel/cpu/tsx.c
572 def normalize_cmdline_options(option, value):
573 # Don't normalize the cmdline option values if
574 # the Linux kernel doesn't use kstrtobool() for them
575 if option in no_kstrtobool_options:
578 # Implement a limited part of the kstrtobool() logic
579 if value in ('1', 'on', 'On', 'ON', 'y', 'Y', 'yes', 'Yes', 'YES'):
581 if value in ('0', 'off', 'Off', 'OFF', 'n', 'N', 'no', 'No', 'NO'):
584 # Preserve unique values