#!/usr/bin/python3
-#
# This tool helps me to check Linux kernel options against
# my security hardening preferences for X86_64, ARM64, X86_32, and ARM.
# Let the computers do their job!
# Author: Alexander Popov <alex.popov@linux.com>
#
# Please don't cry if my Python code looks like C.
-#
-#
-# N.B. Hardening sysctls:
-# kernel.kptr_restrict=2 (or 1?)
-# kernel.dmesg_restrict=1 (also see the kconfig option)
-# kernel.perf_event_paranoid=2 (or 3 with a custom patch, see https://lwn.net/Articles/696216/)
-# kernel.kexec_load_disabled=1
-# kernel.yama.ptrace_scope=3
-# user.max_user_namespaces=0
-# what about bpf_jit_enable?
-# kernel.unprivileged_bpf_disabled=1
-# net.core.bpf_jit_harden=2
-# vm.unprivileged_userfaultfd=0
-# (at first, it disabled unprivileged userfaultfd,
-# and since v5.11 it enables unprivileged userfaultfd for user-mode only)
-# vm.mmap_min_addr has a good value
-# dev.tty.ldisc_autoload=0
-# fs.protected_symlinks=1
-# fs.protected_hardlinks=1
-# fs.protected_fifos=2
-# fs.protected_regular=2
-# fs.suid_dumpable=0
-# kernel.modules_disabled=1
-# kernel.randomize_va_space = 2
-# nosmt sysfs control file
-
# pylint: disable=missing-module-docstring,missing-class-docstring,missing-function-docstring
# pylint: disable=line-too-long,invalid-name,too-many-branches,too-many-statements
-
import sys
from argparse import ArgumentParser
from collections import OrderedDict
import re
import json
from .__about__ import __version__
-
-SIMPLE_OPTION_TYPES = ('kconfig', 'version', 'cmdline')
-
-class OptCheck:
- def __init__(self, reason, decision, name, expected):
- assert(name and name == name.strip() and len(name.split()) == 1), \
- f'invalid name "{name}" for {self.__class__.__name__}'
- self.name = name
-
- assert(decision and decision == decision.strip() and len(decision.split()) == 1), \
- f'invalid decision "{decision}" for "{name}" check'
- self.decision = decision
-
- assert(reason and reason == reason.strip() and len(reason.split()) == 1), \
- f'invalid reason "{reason}" for "{name}" check'
- self.reason = reason
-
- assert(expected and expected == expected.strip()), \
- f'invalid expected value "{expected}" for "{name}" check (1)'
- val_len = len(expected.split())
- if val_len == 3:
- assert(expected in ('is not set', 'is not off')), \
- f'invalid expected value "{expected}" for "{name}" check (2)'
- elif val_len == 2:
- assert(expected == 'is present'), \
- f'invalid expected value "{expected}" for "{name}" check (3)'
- else:
- assert(val_len == 1), \
- f'invalid expected value "{expected}" for "{name}" check (4)'
- self.expected = expected
-
- self.state = None
- self.result = None
-
- @property
- def type(self):
- return None
-
- def check(self):
- # handle the 'is present' check
- if self.expected == 'is present':
- if self.state is None:
- self.result = 'FAIL: is not present'
- else:
- self.result = 'OK: is present'
- return
-
- # handle the 'is not off' option check
- if self.expected == 'is not off':
- if self.state == 'off':
- self.result = 'FAIL: is off'
- if self.state == '0':
- self.result = 'FAIL: is off, "0"'
- elif self.state is None:
- self.result = 'FAIL: is off, not found'
- else:
- self.result = 'OK: is not off, "' + self.state + '"'
- return
-
- # handle the option value check
- if self.expected == self.state:
- self.result = 'OK'
- elif self.state is None:
- if self.expected == 'is not set':
- self.result = 'OK: is not found'
- else:
- self.result = 'FAIL: is not found'
- else:
- self.result = 'FAIL: "' + self.state + '"'
-
- def table_print(self, _mode, with_results):
- print(f'{self.name:<40}|{self.type:^7}|{self.expected:^12}|{self.decision:^10}|{self.reason:^18}', end='')
- if with_results:
- print(f'| {self.result}', end='')
-
- def json_dump(self, with_results):
- dump = [self.name, self.type, self.expected, self.decision, self.reason]
- if with_results:
- dump.append(self.result)
- return dump
-
-
-class KconfigCheck(OptCheck):
- def __init__(self, *args, **kwargs):
- super().__init__(*args, **kwargs)
- self.name = 'CONFIG_' + self.name
-
- @property
- def type(self):
- return 'kconfig'
-
-
-class CmdlineCheck(OptCheck):
- @property
- def type(self):
- return 'cmdline'
-
-
-class VersionCheck:
- def __init__(self, ver_expected):
- assert(ver_expected and isinstance(ver_expected, tuple) and len(ver_expected) == 2), \
- f'invalid version "{ver_expected}" for VersionCheck'
- self.ver_expected = ver_expected
- self.ver = ()
- self.result = None
-
- @property
- def type(self):
- return 'version'
-
- def check(self):
- if self.ver[0] > self.ver_expected[0]:
- self.result = 'OK: version >= ' + str(self.ver_expected[0]) + '.' + str(self.ver_expected[1])
- return
- if self.ver[0] < self.ver_expected[0]:
- self.result = 'FAIL: version < ' + str(self.ver_expected[0]) + '.' + str(self.ver_expected[1])
- return
- if self.ver[1] >= self.ver_expected[1]:
- self.result = 'OK: version >= ' + str(self.ver_expected[0]) + '.' + str(self.ver_expected[1])
- return
- self.result = 'FAIL: version < ' + str(self.ver_expected[0]) + '.' + str(self.ver_expected[1])
-
- def table_print(self, _mode, with_results):
- ver_req = 'kernel version >= ' + str(self.ver_expected[0]) + '.' + str(self.ver_expected[1])
- print(f'{ver_req:<91}', end='')
- if with_results:
- print(f'| {self.result}', end='')
-
-
-class ComplexOptCheck:
- def __init__(self, *opts):
- self.opts = opts
- assert(self.opts), \
- f'empty {self.__class__.__name__} check'
- assert(len(self.opts) != 1), \
- f'useless {self.__class__.__name__} check: {opts}'
- assert(isinstance(opts[0], (KconfigCheck, CmdlineCheck))), \
- f'invalid {self.__class__.__name__} check: {opts}'
- self.result = None
-
- @property
- def type(self):
- return 'complex'
-
- @property
- def name(self):
- return self.opts[0].name
-
- @property
- def expected(self):
- return self.opts[0].expected
-
- def table_print(self, mode, with_results):
- if mode == 'verbose':
- print(f" {'<<< ' + self.__class__.__name__ + ' >>>':87}", end='')
- if with_results:
- print(f'| {self.result}', end='')
- for o in self.opts:
- print()
- o.table_print(mode, with_results)
- else:
- o = self.opts[0]
- o.table_print(mode, False)
- if with_results:
- print(f'| {self.result}', end='')
-
- def json_dump(self, with_results):
- dump = self.opts[0].json_dump(False)
- if with_results:
- dump.append(self.result)
- return dump
-
-
-class OR(ComplexOptCheck):
- # self.opts[0] is the option that this OR-check is about.
- # Use cases:
- # OR(<X_is_hardened>, <X_is_disabled>)
- # OR(<X_is_hardened>, <old_X_is_hardened>)
- def check(self):
- for i, opt in enumerate(self.opts):
- opt.check()
- if opt.result.startswith('OK'):
- self.result = opt.result
- # Add more info for additional checks:
- if i != 0:
- if opt.result == 'OK':
- self.result = f'OK: {opt.name} is "{opt.expected}"'
- elif opt.result == 'OK: is not found':
- self.result = f'OK: {opt.name} is not found'
- elif opt.result == 'OK: is present':
- self.result = f'OK: {opt.name} is present'
- elif opt.result.startswith('OK: is not off'):
- self.result = f'OK: {opt.name} is not off'
- else:
- # VersionCheck provides enough info
- assert(opt.result.startswith('OK: version')), \
- f'unexpected OK description "{opt.result}"'
- return
- self.result = self.opts[0].result
-
-
-class AND(ComplexOptCheck):
- # self.opts[0] is the option that this AND-check is about.
- # Use cases:
- # AND(<suboption>, <main_option>)
- # Suboption is not checked if checking of the main_option is failed.
- # AND(<X_is_disabled>, <old_X_is_disabled>)
- def check(self):
- for i, opt in reversed(list(enumerate(self.opts))):
- opt.check()
- if i == 0:
- self.result = opt.result
- return
- if not opt.result.startswith('OK'):
- # This FAIL is caused by additional checks,
- # and not by the main option that this AND-check is about.
- # Describe the reason of the FAIL.
- if opt.result.startswith('FAIL: \"') or opt.result == 'FAIL: is not found':
- self.result = f'FAIL: {opt.name} is not "{opt.expected}"'
- elif opt.result == 'FAIL: is not present':
- self.result = f'FAIL: {opt.name} is not present'
- elif opt.result in ('FAIL: is off', 'FAIL: is off, "0"'):
- self.result = f'FAIL: {opt.name} is off'
- elif opt.result == 'FAIL: is off, not found':
- self.result = f'FAIL: {opt.name} is off, not found'
- else:
- # VersionCheck provides enough info
- self.result = opt.result
- assert(opt.result.startswith('FAIL: version')), \
- f'unexpected FAIL description "{opt.result}"'
- return
+from .checks import add_kconfig_checks, add_cmdline_checks, normalize_cmdline_options
+from .engine import populate_with_data, perform_checks
def detect_arch(fname, archs):
sys.exit(f'[!] ERROR: invalid GCC_VERSION and CLANG_VERSION: {gcc_version} {clang_version}')
-def add_kconfig_checks(l, arch):
- # Calling the KconfigCheck class constructor:
- # KconfigCheck(reason, decision, name, expected)
- #
- # [!] Don't add CmdlineChecks in add_kconfig_checks() to avoid wrong results
- # when the tool doesn't check the cmdline.
-
- efi_not_set = KconfigCheck('-', '-', 'EFI', 'is not set')
- cc_is_gcc = KconfigCheck('-', '-', 'CC_IS_GCC', 'y') # exists since v4.18
- cc_is_clang = KconfigCheck('-', '-', 'CC_IS_CLANG', 'y') # exists since v4.18
-
- modules_not_set = KconfigCheck('cut_attack_surface', 'kspp', 'MODULES', 'is not set')
- devmem_not_set = KconfigCheck('cut_attack_surface', 'kspp', 'DEVMEM', 'is not set') # refers to LOCKDOWN
- bpf_syscall_not_set = KconfigCheck('cut_attack_surface', 'lockdown', 'BPF_SYSCALL', 'is not set') # refers to LOCKDOWN
-
- # 'self_protection', 'defconfig'
- l += [KconfigCheck('self_protection', 'defconfig', 'BUG', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'SLUB_DEBUG', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'THREAD_INFO_IN_TASK', 'y')]
- gcc_plugins_support_is_set = KconfigCheck('self_protection', 'defconfig', 'GCC_PLUGINS', 'y')
- l += [gcc_plugins_support_is_set]
- iommu_support_is_set = KconfigCheck('self_protection', 'defconfig', 'IOMMU_SUPPORT', 'y')
- l += [iommu_support_is_set] # is needed for mitigating DMA attacks
- l += [OR(KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR', 'y'),
- KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR', 'y'),
- KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_REGULAR', 'y'),
- KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_AUTO', 'y'),
- KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_STRONG', 'y'))]
- l += [OR(KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR_STRONG', 'y'),
- KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_STRONG', 'y'))]
- l += [OR(KconfigCheck('self_protection', 'defconfig', 'STRICT_KERNEL_RWX', 'y'),
- KconfigCheck('self_protection', 'defconfig', 'DEBUG_RODATA', 'y'))] # before v4.11
- l += [OR(KconfigCheck('self_protection', 'defconfig', 'STRICT_MODULE_RWX', 'y'),
- KconfigCheck('self_protection', 'defconfig', 'DEBUG_SET_MODULE_RONX', 'y'),
- modules_not_set)] # DEBUG_SET_MODULE_RONX was before v4.11
- l += [OR(KconfigCheck('self_protection', 'defconfig', 'REFCOUNT_FULL', 'y'),
- VersionCheck((5, 5)))] # REFCOUNT_FULL is enabled by default since v5.5
- if arch in ('X86_64', 'ARM64', 'X86_32'):
- l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_BASE', 'y')]
- if arch in ('X86_64', 'ARM64', 'ARM'):
- l += [KconfigCheck('self_protection', 'defconfig', 'VMAP_STACK', 'y')]
- if arch in ('X86_64', 'X86_32'):
- l += [KconfigCheck('self_protection', 'defconfig', 'DEBUG_WX', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'WERROR', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE_INTEL', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE_AMD', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'MICROCODE', 'y')] # is needed for mitigating CPU bugs
- l += [KconfigCheck('self_protection', 'defconfig', 'RETPOLINE', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'SYN_COOKIES', 'y')] # another reason?
- l += [OR(KconfigCheck('self_protection', 'defconfig', 'X86_SMAP', 'y'),
- VersionCheck((5, 19)))] # X86_SMAP is enabled by default since v5.19
- l += [OR(KconfigCheck('self_protection', 'defconfig', 'X86_UMIP', 'y'),
- KconfigCheck('self_protection', 'defconfig', 'X86_INTEL_UMIP', 'y'))]
- if arch in ('ARM64', 'ARM'):
- l += [KconfigCheck('self_protection', 'defconfig', 'IOMMU_DEFAULT_DMA_STRICT', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'IOMMU_DEFAULT_PASSTHROUGH', 'is not set')] # true if IOMMU_DEFAULT_DMA_STRICT is set
- l += [KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR_PER_TASK', 'y')]
- if arch == 'X86_64':
- l += [KconfigCheck('self_protection', 'defconfig', 'PAGE_TABLE_ISOLATION', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_MEMORY', 'y')]
- l += [AND(KconfigCheck('self_protection', 'defconfig', 'INTEL_IOMMU', 'y'),
- iommu_support_is_set)]
- l += [AND(KconfigCheck('self_protection', 'defconfig', 'AMD_IOMMU', 'y'),
- iommu_support_is_set)]
- if arch == 'ARM64':
- l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_PAN', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_EPAN', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'UNMAP_KERNEL_AT_EL0', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_E0PD', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'RODATA_FULL_DEFAULT_ENABLED', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_PTR_AUTH_KERNEL', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_BTI_KERNEL', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'MITIGATE_SPECTRE_BRANCH_HISTORY', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_MTE', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_MODULE_REGION_FULL', 'y')]
- l += [OR(KconfigCheck('self_protection', 'defconfig', 'HARDEN_EL2_VECTORS', 'y'),
- AND(KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_BASE', 'y'),
- VersionCheck((5, 9))))] # HARDEN_EL2_VECTORS was included in RANDOMIZE_BASE in v5.9
- l += [OR(KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_PREDICTOR', 'y'),
- VersionCheck((5, 10)))] # HARDEN_BRANCH_PREDICTOR is enabled by default since v5.10
- if arch == 'ARM':
- l += [KconfigCheck('self_protection', 'defconfig', 'CPU_SW_DOMAIN_PAN', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_PREDICTOR', 'y')]
- l += [KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_HISTORY', 'y')]
-
- # 'self_protection', 'kspp'
- l += [KconfigCheck('self_protection', 'kspp', 'BUG_ON_DATA_CORRUPTION', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'SCHED_STACK_END_CHECK', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'SLAB_FREELIST_HARDENED', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'SLAB_FREELIST_RANDOM', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'SHUFFLE_PAGE_ALLOCATOR', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'FORTIFY_SOURCE', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_LIST', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_VIRTUAL', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_SG', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_CREDENTIALS', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_NOTIFIERS', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'INIT_ON_ALLOC_DEFAULT_ON', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'KFENCE', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'ZERO_CALL_USED_REGS', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'HW_RANDOM_TPM', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'STATIC_USERMODEHELPER', 'y')] # needs userspace support
- randstruct_is_set = OR(KconfigCheck('self_protection', 'kspp', 'RANDSTRUCT_FULL', 'y'),
- KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_RANDSTRUCT', 'y'))
- l += [randstruct_is_set]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'RANDSTRUCT_PERFORMANCE', 'is not set'),
- KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set'),
- randstruct_is_set)]
- hardened_usercopy_is_set = KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY', 'y')
- l += [hardened_usercopy_is_set]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'),
- hardened_usercopy_is_set)]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_PAGESPAN', 'is not set'),
- hardened_usercopy_is_set)]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_LATENT_ENTROPY', 'y'),
- gcc_plugins_support_is_set)]
- l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG', 'y'),
- modules_not_set)]
- l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG_ALL', 'y'),
- modules_not_set)]
- l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG_SHA512', 'y'),
- modules_not_set)]
- l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG_FORCE', 'y'),
- modules_not_set)] # refers to LOCKDOWN
- l += [OR(KconfigCheck('self_protection', 'kspp', 'INIT_STACK_ALL_ZERO', 'y'),
- KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y'))]
- l += [OR(KconfigCheck('self_protection', 'kspp', 'INIT_ON_FREE_DEFAULT_ON', 'y'),
- KconfigCheck('self_protection', 'kspp', 'PAGE_POISONING_ZERO', 'y'))]
- # CONFIG_INIT_ON_FREE_DEFAULT_ON was added in v5.3.
- # CONFIG_PAGE_POISONING_ZERO was removed in v5.11.
- # Starting from v5.11 CONFIG_PAGE_POISONING unconditionally checks
- # the 0xAA poison pattern on allocation.
- # That brings higher performance penalty.
- l += [OR(KconfigCheck('self_protection', 'kspp', 'EFI_DISABLE_PCI_DMA', 'y'),
- efi_not_set)]
- l += [OR(KconfigCheck('self_protection', 'kspp', 'RESET_ATTACK_MITIGATION', 'y'),
- efi_not_set)] # needs userspace support (systemd)
- ubsan_bounds_is_set = KconfigCheck('self_protection', 'kspp', 'UBSAN_BOUNDS', 'y')
- l += [ubsan_bounds_is_set]
- l += [OR(KconfigCheck('self_protection', 'kspp', 'UBSAN_LOCAL_BOUNDS', 'y'),
- AND(ubsan_bounds_is_set,
- cc_is_gcc))]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'UBSAN_TRAP', 'y'),
- ubsan_bounds_is_set,
- KconfigCheck('self_protection', 'kspp', 'UBSAN_SHIFT', 'is not set'),
- KconfigCheck('self_protection', 'kspp', 'UBSAN_DIV_ZERO', 'is not set'),
- KconfigCheck('self_protection', 'kspp', 'UBSAN_UNREACHABLE', 'is not set'),
- KconfigCheck('self_protection', 'kspp', 'UBSAN_BOOL', 'is not set'),
- KconfigCheck('self_protection', 'kspp', 'UBSAN_ENUM', 'is not set'),
- KconfigCheck('self_protection', 'kspp', 'UBSAN_ALIGNMENT', 'is not set'))] # only array index bounds checking with traps
- if arch in ('X86_64', 'ARM64', 'X86_32'):
- l += [AND(KconfigCheck('self_protection', 'kspp', 'UBSAN_SANITIZE_ALL', 'y'),
- ubsan_bounds_is_set)] # ARCH_HAS_UBSAN_SANITIZE_ALL is not enabled for ARM
- stackleak_is_set = KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_STACKLEAK', 'y')
- l += [AND(stackleak_is_set, gcc_plugins_support_is_set)]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'STACKLEAK_METRICS', 'is not set'),
- stackleak_is_set,
- gcc_plugins_support_is_set)]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'STACKLEAK_RUNTIME_DISABLE', 'is not set'),
- stackleak_is_set,
- gcc_plugins_support_is_set)]
- l += [KconfigCheck('self_protection', 'kspp', 'RANDOMIZE_KSTACK_OFFSET_DEFAULT', 'y')]
- if arch in ('X86_64', 'ARM64'):
- cfi_clang_is_set = KconfigCheck('self_protection', 'kspp', 'CFI_CLANG', 'y')
- l += [cfi_clang_is_set]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'CFI_PERMISSIVE', 'is not set'),
- cfi_clang_is_set)]
- if arch in ('X86_64', 'X86_32'):
- l += [KconfigCheck('self_protection', 'kspp', 'SCHED_CORE', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'DEFAULT_MMAP_MIN_ADDR', '65536')]
- l += [KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_DMA_STRICT', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_PASSTHROUGH', 'is not set')] # true if IOMMU_DEFAULT_DMA_STRICT is set
- l += [AND(KconfigCheck('self_protection', 'kspp', 'INTEL_IOMMU_DEFAULT_ON', 'y'),
- iommu_support_is_set)]
- if arch in ('ARM64', 'ARM'):
- l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_WX', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'WERROR', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'DEFAULT_MMAP_MIN_ADDR', '32768')]
- l += [KconfigCheck('self_protection', 'kspp', 'SYN_COOKIES', 'y')] # another reason?
- if arch == 'X86_64':
- l += [KconfigCheck('self_protection', 'kspp', 'SLS', 'y')] # vs CVE-2021-26341 in Straight-Line-Speculation
- l += [AND(KconfigCheck('self_protection', 'kspp', 'INTEL_IOMMU_SVM', 'y'),
- iommu_support_is_set)]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'AMD_IOMMU_V2', 'y'),
- iommu_support_is_set)]
- if arch == 'ARM64':
- l += [KconfigCheck('self_protection', 'kspp', 'ARM64_SW_TTBR0_PAN', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'SHADOW_CALL_STACK', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'KASAN_HW_TAGS', 'y')] # see also: kasan=on, kasan.stacktrace=off, kasan.fault=panic
- if arch == 'X86_32':
- l += [KconfigCheck('self_protection', 'kspp', 'PAGE_TABLE_ISOLATION', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'HIGHMEM64G', 'y')]
- l += [KconfigCheck('self_protection', 'kspp', 'X86_PAE', 'y')]
- l += [AND(KconfigCheck('self_protection', 'kspp', 'INTEL_IOMMU', 'y'),
- iommu_support_is_set)]
-
- # 'self_protection', 'clipos'
- l += [KconfigCheck('self_protection', 'clipos', 'SLAB_MERGE_DEFAULT', 'is not set')]
-
- # 'security_policy'
- if arch in ('X86_64', 'ARM64', 'X86_32'):
- l += [KconfigCheck('security_policy', 'defconfig', 'SECURITY', 'y')] # and choose your favourite LSM
- if arch == 'ARM':
- l += [KconfigCheck('security_policy', 'kspp', 'SECURITY', 'y')] # and choose your favourite LSM
- l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_YAMA', 'y')]
- l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_LANDLOCK', 'y')]
- l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_SELINUX_DISABLE', 'is not set')]
- l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_SELINUX_BOOTPARAM', 'is not set')]
- l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_SELINUX_DEVELOP', 'is not set')]
- l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_LOCKDOWN_LSM', 'y')]
- l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_LOCKDOWN_LSM_EARLY', 'y')]
- l += [KconfigCheck('security_policy', 'kspp', 'LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY', 'y')]
- l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_WRITABLE_HOOKS', 'is not set')] # refers to SECURITY_SELINUX_DISABLE
-
- # 'cut_attack_surface', 'defconfig'
- l += [KconfigCheck('cut_attack_surface', 'defconfig', 'SECCOMP', 'y')]
- l += [KconfigCheck('cut_attack_surface', 'defconfig', 'SECCOMP_FILTER', 'y')]
- l += [OR(KconfigCheck('cut_attack_surface', 'defconfig', 'BPF_UNPRIV_DEFAULT_OFF', 'y'),
- bpf_syscall_not_set)] # see unprivileged_bpf_disabled
- if arch in ('X86_64', 'ARM64', 'X86_32'):
- l += [OR(KconfigCheck('cut_attack_surface', 'defconfig', 'STRICT_DEVMEM', 'y'),
- devmem_not_set)] # refers to LOCKDOWN
- if arch in ('X86_64', 'X86_32'):
- l += [KconfigCheck('cut_attack_surface', 'defconfig', 'X86_INTEL_TSX_MODE_OFF', 'y')] # tsx=off
-
- # 'cut_attack_surface', 'kspp'
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'SECURITY_DMESG_RESTRICT', 'y')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'ACPI_CUSTOM_METHOD', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT_BRK', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'DEVKMEM', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT_VDSO', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'BINFMT_MISC', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'INET_DIAG', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'KEXEC', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'PROC_KCORE', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_PTYS', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'HIBERNATION', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'IA32_EMULATION', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'X86_X32', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'X86_X32_ABI', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'MODIFY_LDT_SYSCALL', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'OABI_COMPAT', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'X86_MSR', 'is not set')] # refers to LOCKDOWN
- l += [modules_not_set]
- l += [devmem_not_set]
- l += [OR(KconfigCheck('cut_attack_surface', 'kspp', 'IO_STRICT_DEVMEM', 'y'),
- devmem_not_set)] # refers to LOCKDOWN
- l += [AND(KconfigCheck('cut_attack_surface', 'kspp', 'LDISC_AUTOLOAD', 'is not set'),
- KconfigCheck('cut_attack_surface', 'kspp', 'LDISC_AUTOLOAD', 'is present'))]
- if arch == 'X86_64':
- l += [KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_VSYSCALL_NONE', 'y')] # 'vsyscall=none'
- if arch == 'ARM':
- l += [OR(KconfigCheck('cut_attack_surface', 'kspp', 'STRICT_DEVMEM', 'y'),
- devmem_not_set)] # refers to LOCKDOWN
-
- # 'cut_attack_surface', 'grsec'
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'ZSMALLOC_STAT', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'PAGE_OWNER', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'DEBUG_KMEMLEAK', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'BINFMT_AOUT', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'KPROBE_EVENTS', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'UPROBE_EVENTS', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'GENERIC_TRACER', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'FUNCTION_TRACER', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'STACK_TRACER', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'HIST_TRIGGERS', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'BLK_DEV_IO_TRACE', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'PROC_VMCORE', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'PROC_PAGE_MONITOR', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'USELIB', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'CHECKPOINT_RESTORE', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'USERFAULTFD', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'HWPOISON_INJECT', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'MEM_SOFT_DIRTY', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'DEVPORT', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'DEBUG_FS', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'NOTIFIER_ERROR_INJECTION', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'FAIL_FUTEX', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'PUNIT_ATOM_DEBUG', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'ACPI_CONFIGFS', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'EDAC_DEBUG', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'DRM_I915_DEBUG', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'BCACHE_CLOSURES_DEBUG', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'DVB_C8SECTPFE', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'MTD_SLRAM', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'MTD_PHRAM', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'IO_URING', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'KCMP', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'RSEQ', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'LATENCYTOP', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'KCOV', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'PROVIDE_OHCI1394_DMA_INIT', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'grsec', 'SUNRPC_DEBUG', 'is not set')]
- l += [AND(KconfigCheck('cut_attack_surface', 'grsec', 'PTDUMP_DEBUGFS', 'is not set'),
- KconfigCheck('cut_attack_surface', 'grsec', 'X86_PTDUMP', 'is not set'))]
-
- # 'cut_attack_surface', 'maintainer'
- l += [KconfigCheck('cut_attack_surface', 'maintainer', 'DRM_LEGACY', 'is not set')] # recommended by Daniel Vetter in /issues/38
- l += [KconfigCheck('cut_attack_surface', 'maintainer', 'FB', 'is not set')] # recommended by Daniel Vetter in /issues/38
- l += [KconfigCheck('cut_attack_surface', 'maintainer', 'VT', 'is not set')] # recommended by Daniel Vetter in /issues/38
- l += [KconfigCheck('cut_attack_surface', 'maintainer', 'BLK_DEV_FD', 'is not set')] # recommended by Denis Efremov in /pull/54
- l += [KconfigCheck('cut_attack_surface', 'maintainer', 'BLK_DEV_FD_RAWCMD', 'is not set')] # recommended by Denis Efremov in /pull/62
- l += [KconfigCheck('cut_attack_surface', 'maintainer', 'NOUVEAU_LEGACY_CTX_SUPPORT', 'is not set')]
- # recommended by Dave Airlie in kernel commit b30a43ac7132cdda
-
- # 'cut_attack_surface', 'clipos'
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'STAGING', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'KSM', 'is not set')] # to prevent FLUSH+RELOAD attack
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'KALLSYMS', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'X86_VSYSCALL_EMULATION', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'MAGIC_SYSRQ', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'KEXEC_FILE', 'is not set')] # refers to LOCKDOWN (permissive)
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'USER_NS', 'is not set')] # user.max_user_namespaces=0
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'X86_CPUID', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'X86_IOPL_IOPERM', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'ACPI_TABLE_UPGRADE', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'EFI_CUSTOM_SSDT_OVERLAYS', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'clipos', 'COREDUMP', 'is not set')] # cut userspace attack surface
-# l += [KconfigCheck('cut_attack_surface', 'clipos', 'IKCONFIG', 'is not set')] # no, IKCONFIG is needed for this check :)
-
- # 'cut_attack_surface', 'lockdown'
- l += [KconfigCheck('cut_attack_surface', 'lockdown', 'EFI_TEST', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'lockdown', 'MMIOTRACE_TEST', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'lockdown', 'KPROBES', 'is not set')] # refers to LOCKDOWN
- l += [bpf_syscall_not_set] # refers to LOCKDOWN
-
- # 'cut_attack_surface', 'my'
- l += [KconfigCheck('cut_attack_surface', 'my', 'MMIOTRACE', 'is not set')] # refers to LOCKDOWN (permissive)
- l += [KconfigCheck('cut_attack_surface', 'my', 'LIVEPATCH', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'my', 'IP_DCCP', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'my', 'IP_SCTP', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'my', 'FTRACE', 'is not set')] # refers to LOCKDOWN
- l += [KconfigCheck('cut_attack_surface', 'my', 'VIDEO_VIVID', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'my', 'INPUT_EVBUG', 'is not set')] # Can be used as a keylogger
- l += [KconfigCheck('cut_attack_surface', 'my', 'KGDB', 'is not set')]
- l += [KconfigCheck('cut_attack_surface', 'my', 'AIO', 'is not set')]
- l += [OR(KconfigCheck('cut_attack_surface', 'my', 'TRIM_UNUSED_KSYMS', 'y'),
- modules_not_set)]
-
- # 'harden_userspace'
- if arch in ('X86_64', 'ARM64', 'X86_32'):
- l += [KconfigCheck('harden_userspace', 'defconfig', 'INTEGRITY', 'y')]
- if arch == 'ARM':
- l += [KconfigCheck('harden_userspace', 'my', 'INTEGRITY', 'y')]
- if arch == 'ARM64':
- l += [KconfigCheck('harden_userspace', 'defconfig', 'ARM64_PTR_AUTH', 'y')]
- l += [KconfigCheck('harden_userspace', 'defconfig', 'ARM64_BTI', 'y')]
- if arch in ('ARM', 'X86_32'):
- l += [KconfigCheck('harden_userspace', 'defconfig', 'VMSPLIT_3G', 'y')]
- if arch in ('X86_64', 'ARM64'):
- l += [KconfigCheck('harden_userspace', 'clipos', 'ARCH_MMAP_RND_BITS', '32')]
- if arch in ('X86_32', 'ARM'):
- l += [KconfigCheck('harden_userspace', 'my', 'ARCH_MMAP_RND_BITS', '16')]
-
-
-def add_cmdline_checks(l, arch):
- # Calling the CmdlineCheck class constructor:
- # CmdlineCheck(reason, decision, name, expected)
- #
- # [!] Don't add CmdlineChecks in add_kconfig_checks() to avoid wrong results
- # when the tool doesn't check the cmdline.
- #
- # [!] Make sure that values of the options in CmdlineChecks need normalization.
- # For more info see normalize_cmdline_options().
- #
- # A common pattern for checking the 'param_x' cmdline parameter
- # that __overrides__ the 'PARAM_X_DEFAULT' kconfig option:
- # l += [OR(CmdlineCheck(reason, decision, 'param_x', '1'),
- # AND(KconfigCheck(reason, decision, 'PARAM_X_DEFAULT_ON', 'y'),
- # CmdlineCheck(reason, decision, 'param_x, 'is not set')))]
- #
- # Here we don't check the kconfig options or minimal kernel version
- # required for the cmdline parameters. That would make the checks
- # very complex and not give a 100% guarantee anyway.
-
- # 'self_protection', 'defconfig'
- l += [CmdlineCheck('self_protection', 'defconfig', 'nosmep', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'nosmap', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'nokaslr', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'nopti', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'nospectre_v1', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'nospectre_v2', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'nospectre_bhb', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'nospec_store_bypass_disable', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'arm64.nobti', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'arm64.nopauth', 'is not set')]
- l += [CmdlineCheck('self_protection', 'defconfig', 'arm64.nomte', 'is not set')]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'spectre_v2', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'spectre_v2', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'spectre_v2_user', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'spectre_v2_user', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'spec_store_bypass_disable', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'spec_store_bypass_disable', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'l1tf', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'l1tf', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'mds', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'mds', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'tsx_async_abort', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'tsx_async_abort', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'srbds', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'srbds', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'mmio_stale_data', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'mmio_stale_data', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'retbleed', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'retbleed', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'kpti', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'kpti', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'kvm.nx_huge_pages', 'is not off'),
- CmdlineCheck('self_protection', 'defconfig', 'kvm.nx_huge_pages', 'is not set'))]
- if arch == 'ARM64':
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'ssbd', 'kernel'),
- CmdlineCheck('self_protection', 'my', 'ssbd', 'force-on'),
- CmdlineCheck('self_protection', 'defconfig', 'ssbd', 'is not set'))]
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'rodata', 'full'),
- AND(KconfigCheck('self_protection', 'defconfig', 'RODATA_FULL_DEFAULT_ENABLED', 'y'),
- CmdlineCheck('self_protection', 'defconfig', 'rodata', 'is not set')))]
- else:
- l += [OR(CmdlineCheck('self_protection', 'defconfig', 'rodata', '1'),
- CmdlineCheck('self_protection', 'defconfig', 'rodata', 'is not set'))]
-
- # 'self_protection', 'kspp'
- l += [CmdlineCheck('self_protection', 'kspp', 'nosmt', 'is present')]
- l += [CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt')] # 'nosmt' by kspp + 'auto' by defconfig
- l += [OR(CmdlineCheck('self_protection', 'kspp', 'init_on_alloc', '1'),
- AND(KconfigCheck('self_protection', 'kspp', 'INIT_ON_ALLOC_DEFAULT_ON', 'y'),
- CmdlineCheck('self_protection', 'kspp', 'init_on_alloc', 'is not set')))]
- l += [OR(CmdlineCheck('self_protection', 'kspp', 'init_on_free', '1'),
- AND(KconfigCheck('self_protection', 'kspp', 'INIT_ON_FREE_DEFAULT_ON', 'y'),
- CmdlineCheck('self_protection', 'kspp', 'init_on_free', 'is not set')),
- AND(CmdlineCheck('self_protection', 'kspp', 'page_poison', '1'),
- KconfigCheck('self_protection', 'kspp', 'PAGE_POISONING_ZERO', 'y'),
- CmdlineCheck('self_protection', 'kspp', 'slub_debug', 'P')))]
- l += [OR(CmdlineCheck('self_protection', 'kspp', 'slab_nomerge', 'is present'),
- AND(KconfigCheck('self_protection', 'clipos', 'SLAB_MERGE_DEFAULT', 'is not set'),
- CmdlineCheck('self_protection', 'kspp', 'slab_merge', 'is not set'),
- CmdlineCheck('self_protection', 'clipos', 'slub_merge', 'is not set')))]
- l += [OR(CmdlineCheck('self_protection', 'kspp', 'iommu.strict', '1'),
- AND(KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_DMA_STRICT', 'y'),
- CmdlineCheck('self_protection', 'kspp', 'iommu.strict', 'is not set')))]
- l += [OR(CmdlineCheck('self_protection', 'kspp', 'iommu.passthrough', '0'),
- AND(KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_PASSTHROUGH', 'is not set'),
- CmdlineCheck('self_protection', 'kspp', 'iommu.passthrough', 'is not set')))]
- # The cmdline checks compatible with the kconfig recommendations of the KSPP project...
- l += [OR(CmdlineCheck('self_protection', 'kspp', 'hardened_usercopy', '1'),
- AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY', 'y'),
- CmdlineCheck('self_protection', 'kspp', 'hardened_usercopy', 'is not set')))]
- l += [OR(CmdlineCheck('self_protection', 'kspp', 'slab_common.usercopy_fallback', '0'),
- AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'),
- CmdlineCheck('self_protection', 'kspp', 'slab_common.usercopy_fallback', 'is not set')))]
- # ... the end
- if arch in ('X86_64', 'ARM64', 'X86_32'):
- l += [OR(CmdlineCheck('self_protection', 'kspp', 'randomize_kstack_offset', '1'),
- AND(KconfigCheck('self_protection', 'kspp', 'RANDOMIZE_KSTACK_OFFSET_DEFAULT', 'y'),
- CmdlineCheck('self_protection', 'kspp', 'randomize_kstack_offset', 'is not set')))]
- if arch in ('X86_64', 'X86_32'):
- l += [AND(CmdlineCheck('self_protection', 'kspp', 'pti', 'on'),
- CmdlineCheck('self_protection', 'defconfig', 'nopti', 'is not set'))]
-
- # 'self_protection', 'clipos'
- l += [CmdlineCheck('self_protection', 'clipos', 'page_alloc.shuffle', '1')]
- if arch in ('X86_64', 'X86_32'):
- l += [CmdlineCheck('self_protection', 'clipos', 'iommu', 'force')]
-
- # 'cut_attack_surface', 'defconfig'
- if arch in ('X86_64', 'X86_32'):
- l += [OR(CmdlineCheck('cut_attack_surface', 'defconfig', 'tsx', 'off'),
- AND(KconfigCheck('cut_attack_surface', 'defconfig', 'X86_INTEL_TSX_MODE_OFF', 'y'),
- CmdlineCheck('cut_attack_surface', 'defconfig', 'tsx', 'is not set')))]
-
- # 'cut_attack_surface', 'kspp'
- if arch == 'X86_64':
- l += [OR(CmdlineCheck('cut_attack_surface', 'kspp', 'vsyscall', 'none'),
- AND(KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_VSYSCALL_NONE', 'y'),
- CmdlineCheck('cut_attack_surface', 'kspp', 'vsyscall', 'is not set')))]
-
- # 'cut_attack_surface', 'grsec'
- # The cmdline checks compatible with the kconfig options disabled by grsecurity...
- l += [OR(CmdlineCheck('cut_attack_surface', 'grsec', 'debugfs', 'off'),
- KconfigCheck('cut_attack_surface', 'grsec', 'DEBUG_FS', 'is not set'))] # ... the end
-
- # 'cut_attack_surface', 'my'
- l += [CmdlineCheck('cut_attack_surface', 'my', 'sysrq_always_enabled', 'is not set')]
-
def print_unknown_options(checklist, parsed_options):
known_options = []
print(f'[+] Config check is finished: \'OK\' - {ok_count}{ok_suppressed} / \'FAIL\' - {fail_count}{fail_suppressed}')
-def populate_simple_opt_with_data(opt, data, data_type):
- assert(opt.type != 'complex'), \
- f'unexpected ComplexOptCheck "{opt.name}"'
- assert(opt.type in SIMPLE_OPTION_TYPES), \
- f'invalid opt type "{opt.type}"'
- assert(data_type in SIMPLE_OPTION_TYPES), \
- f'invalid data type "{data_type}"'
-
- if data_type != opt.type:
- return
-
- if data_type in ('kconfig', 'cmdline'):
- opt.state = data.get(opt.name, None)
- else:
- assert(data_type == 'version'), \
- f'unexpected data type "{data_type}"'
- opt.ver = data
-
-
-def populate_opt_with_data(opt, data, data_type):
- if opt.type == 'complex':
- for o in opt.opts:
- if o.type == 'complex':
- # Recursion for nested ComplexOptCheck objects
- populate_opt_with_data(o, data, data_type)
- else:
- populate_simple_opt_with_data(o, data, data_type)
- else:
- assert(opt.type in ('kconfig', 'cmdline')), \
- f'bad type "{opt.type}" for a simple check'
- populate_simple_opt_with_data(opt, data, data_type)
-
-
-def populate_with_data(checklist, data, data_type):
- for opt in checklist:
- populate_opt_with_data(opt, data, data_type)
-
-
-def perform_checks(checklist):
- for opt in checklist:
- opt.check()
-
-
def parse_kconfig_file(parsed_options, fname):
with open(fname, 'r', encoding='utf-8') as f:
opt_is_on = re.compile("CONFIG_[a-zA-Z0-9_]*=[a-zA-Z0-9_\"]*")
parsed_options[option] = value
-def normalize_cmdline_options(option, value):
- # Don't normalize the cmdline option values if
- # the Linux kernel doesn't use kstrtobool() for them
- if option == 'debugfs':
- # See debugfs_kernel() in fs/debugfs/inode.c
- return value
- if option == 'mitigations':
- # See mitigations_parse_cmdline() in kernel/cpu.c
- return value
- if option == 'pti':
- # See pti_check_boottime_disable() in arch/x86/mm/pti.c
- return value
- if option == 'spectre_v2':
- # See spectre_v2_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
- return value
- if option == 'spectre_v2_user':
- # See spectre_v2_parse_user_cmdline() in arch/x86/kernel/cpu/bugs.c
- return value
- if option == 'spec_store_bypass_disable':
- # See ssb_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
- return value
- if option == 'l1tf':
- # See l1tf_cmdline() in arch/x86/kernel/cpu/bugs.c
- return value
- if option == 'mds':
- # See mds_cmdline() in arch/x86/kernel/cpu/bugs.c
- return value
- if option == 'tsx_async_abort':
- # See tsx_async_abort_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
- return value
- if option == 'srbds':
- # See srbds_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
- return value
- if option == 'mmio_stale_data':
- # See mmio_stale_data_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
- return value
- if option == 'retbleed':
- # See retbleed_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
- return value
- if option == 'tsx':
- # See tsx_init() in arch/x86/kernel/cpu/tsx.c
- return value
-
- # Implement a limited part of the kstrtobool() logic
- if value in ('1', 'on', 'On', 'ON', 'y', 'Y', 'yes', 'Yes', 'YES'):
- return '1'
- if value in ('0', 'off', 'Off', 'OFF', 'n', 'N', 'no', 'No', 'NO'):
- return '0'
-
- # Preserve unique values
- return value
-
-
def parse_cmdline_file(parsed_options, fname):
with open(fname, 'r', encoding='utf-8') as f:
line = f.readline()
--- /dev/null
+#!/usr/bin/python3
+
+# N.B. Hardening sysctls:
+# kernel.kptr_restrict=2 (or 1?)
+# kernel.dmesg_restrict=1 (also see the kconfig option)
+# kernel.perf_event_paranoid=2 (or 3 with a custom patch, see https://lwn.net/Articles/696216/)
+# kernel.kexec_load_disabled=1
+# kernel.yama.ptrace_scope=3
+# user.max_user_namespaces=0
+# what about bpf_jit_enable?
+# kernel.unprivileged_bpf_disabled=1
+# net.core.bpf_jit_harden=2
+# vm.unprivileged_userfaultfd=0
+# (at first, it disabled unprivileged userfaultfd,
+# and since v5.11 it enables unprivileged userfaultfd for user-mode only)
+# vm.mmap_min_addr has a good value
+# dev.tty.ldisc_autoload=0
+# fs.protected_symlinks=1
+# fs.protected_hardlinks=1
+# fs.protected_fifos=2
+# fs.protected_regular=2
+# fs.suid_dumpable=0
+# kernel.modules_disabled=1
+# kernel.randomize_va_space = 2
+# nosmt sysfs control file
+#
+# Think of these boot params:
+# module.sig_enforce=1
+# lockdown=confidentiality
+# mce=0
+# nosmt=force
+# intel_iommu=on
+# amd_iommu=on
+# efi=disable_early_pci_dma
+
+# pylint: disable=missing-module-docstring,missing-class-docstring,missing-function-docstring
+# pylint: disable=line-too-long,invalid-name,too-many-branches,too-many-statements
+
+from .engine import KconfigCheck, CmdlineCheck, VersionCheck, OR, AND
+
+
+def add_kconfig_checks(l, arch):
+ # Calling the KconfigCheck class constructor:
+ # KconfigCheck(reason, decision, name, expected)
+ #
+ # [!] Don't add CmdlineChecks in add_kconfig_checks() to avoid wrong results
+ # when the tool doesn't check the cmdline.
+
+ efi_not_set = KconfigCheck('-', '-', 'EFI', 'is not set')
+ cc_is_gcc = KconfigCheck('-', '-', 'CC_IS_GCC', 'y') # exists since v4.18
+ cc_is_clang = KconfigCheck('-', '-', 'CC_IS_CLANG', 'y') # exists since v4.18
+
+ modules_not_set = KconfigCheck('cut_attack_surface', 'kspp', 'MODULES', 'is not set')
+ devmem_not_set = KconfigCheck('cut_attack_surface', 'kspp', 'DEVMEM', 'is not set') # refers to LOCKDOWN
+ bpf_syscall_not_set = KconfigCheck('cut_attack_surface', 'lockdown', 'BPF_SYSCALL', 'is not set') # refers to LOCKDOWN
+
+ # 'self_protection', 'defconfig'
+ l += [KconfigCheck('self_protection', 'defconfig', 'BUG', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'SLUB_DEBUG', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'THREAD_INFO_IN_TASK', 'y')]
+ gcc_plugins_support_is_set = KconfigCheck('self_protection', 'defconfig', 'GCC_PLUGINS', 'y')
+ l += [gcc_plugins_support_is_set]
+ iommu_support_is_set = KconfigCheck('self_protection', 'defconfig', 'IOMMU_SUPPORT', 'y')
+ l += [iommu_support_is_set] # is needed for mitigating DMA attacks
+ l += [OR(KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR', 'y'),
+ KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR', 'y'),
+ KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_REGULAR', 'y'),
+ KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_AUTO', 'y'),
+ KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_STRONG', 'y'))]
+ l += [OR(KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR_STRONG', 'y'),
+ KconfigCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_STRONG', 'y'))]
+ l += [OR(KconfigCheck('self_protection', 'defconfig', 'STRICT_KERNEL_RWX', 'y'),
+ KconfigCheck('self_protection', 'defconfig', 'DEBUG_RODATA', 'y'))] # before v4.11
+ l += [OR(KconfigCheck('self_protection', 'defconfig', 'STRICT_MODULE_RWX', 'y'),
+ KconfigCheck('self_protection', 'defconfig', 'DEBUG_SET_MODULE_RONX', 'y'),
+ modules_not_set)] # DEBUG_SET_MODULE_RONX was before v4.11
+ l += [OR(KconfigCheck('self_protection', 'defconfig', 'REFCOUNT_FULL', 'y'),
+ VersionCheck((5, 5)))] # REFCOUNT_FULL is enabled by default since v5.5
+ if arch in ('X86_64', 'ARM64', 'X86_32'):
+ l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_BASE', 'y')]
+ if arch in ('X86_64', 'ARM64', 'ARM'):
+ l += [KconfigCheck('self_protection', 'defconfig', 'VMAP_STACK', 'y')]
+ if arch in ('X86_64', 'X86_32'):
+ l += [KconfigCheck('self_protection', 'defconfig', 'DEBUG_WX', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'WERROR', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE_INTEL', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE_AMD', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'MICROCODE', 'y')] # is needed for mitigating CPU bugs
+ l += [KconfigCheck('self_protection', 'defconfig', 'RETPOLINE', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'SYN_COOKIES', 'y')] # another reason?
+ l += [OR(KconfigCheck('self_protection', 'defconfig', 'X86_SMAP', 'y'),
+ VersionCheck((5, 19)))] # X86_SMAP is enabled by default since v5.19
+ l += [OR(KconfigCheck('self_protection', 'defconfig', 'X86_UMIP', 'y'),
+ KconfigCheck('self_protection', 'defconfig', 'X86_INTEL_UMIP', 'y'))]
+ if arch in ('ARM64', 'ARM'):
+ l += [KconfigCheck('self_protection', 'defconfig', 'IOMMU_DEFAULT_DMA_STRICT', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'IOMMU_DEFAULT_PASSTHROUGH', 'is not set')] # true if IOMMU_DEFAULT_DMA_STRICT is set
+ l += [KconfigCheck('self_protection', 'defconfig', 'STACKPROTECTOR_PER_TASK', 'y')]
+ if arch == 'X86_64':
+ l += [KconfigCheck('self_protection', 'defconfig', 'PAGE_TABLE_ISOLATION', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_MEMORY', 'y')]
+ l += [AND(KconfigCheck('self_protection', 'defconfig', 'INTEL_IOMMU', 'y'),
+ iommu_support_is_set)]
+ l += [AND(KconfigCheck('self_protection', 'defconfig', 'AMD_IOMMU', 'y'),
+ iommu_support_is_set)]
+ if arch == 'ARM64':
+ l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_PAN', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_EPAN', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'UNMAP_KERNEL_AT_EL0', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_E0PD', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'RODATA_FULL_DEFAULT_ENABLED', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_PTR_AUTH_KERNEL', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_BTI_KERNEL', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'MITIGATE_SPECTRE_BRANCH_HISTORY', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'ARM64_MTE', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_MODULE_REGION_FULL', 'y')]
+ l += [OR(KconfigCheck('self_protection', 'defconfig', 'HARDEN_EL2_VECTORS', 'y'),
+ AND(KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_BASE', 'y'),
+ VersionCheck((5, 9))))] # HARDEN_EL2_VECTORS was included in RANDOMIZE_BASE in v5.9
+ l += [OR(KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_PREDICTOR', 'y'),
+ VersionCheck((5, 10)))] # HARDEN_BRANCH_PREDICTOR is enabled by default since v5.10
+ if arch == 'ARM':
+ l += [KconfigCheck('self_protection', 'defconfig', 'CPU_SW_DOMAIN_PAN', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_PREDICTOR', 'y')]
+ l += [KconfigCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_HISTORY', 'y')]
+
+ # 'self_protection', 'kspp'
+ l += [KconfigCheck('self_protection', 'kspp', 'BUG_ON_DATA_CORRUPTION', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'SCHED_STACK_END_CHECK', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'SLAB_FREELIST_HARDENED', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'SLAB_FREELIST_RANDOM', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'SHUFFLE_PAGE_ALLOCATOR', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'FORTIFY_SOURCE', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_LIST', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_VIRTUAL', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_SG', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_CREDENTIALS', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_NOTIFIERS', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'INIT_ON_ALLOC_DEFAULT_ON', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'KFENCE', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'ZERO_CALL_USED_REGS', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'HW_RANDOM_TPM', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'STATIC_USERMODEHELPER', 'y')] # needs userspace support
+ randstruct_is_set = OR(KconfigCheck('self_protection', 'kspp', 'RANDSTRUCT_FULL', 'y'),
+ KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_RANDSTRUCT', 'y'))
+ l += [randstruct_is_set]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'RANDSTRUCT_PERFORMANCE', 'is not set'),
+ KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set'),
+ randstruct_is_set)]
+ hardened_usercopy_is_set = KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY', 'y')
+ l += [hardened_usercopy_is_set]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'),
+ hardened_usercopy_is_set)]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_PAGESPAN', 'is not set'),
+ hardened_usercopy_is_set)]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_LATENT_ENTROPY', 'y'),
+ gcc_plugins_support_is_set)]
+ l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG', 'y'),
+ modules_not_set)]
+ l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG_ALL', 'y'),
+ modules_not_set)]
+ l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG_SHA512', 'y'),
+ modules_not_set)]
+ l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG_FORCE', 'y'),
+ modules_not_set)] # refers to LOCKDOWN
+ l += [OR(KconfigCheck('self_protection', 'kspp', 'INIT_STACK_ALL_ZERO', 'y'),
+ KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y'))]
+ l += [OR(KconfigCheck('self_protection', 'kspp', 'INIT_ON_FREE_DEFAULT_ON', 'y'),
+ KconfigCheck('self_protection', 'kspp', 'PAGE_POISONING_ZERO', 'y'))]
+ # CONFIG_INIT_ON_FREE_DEFAULT_ON was added in v5.3.
+ # CONFIG_PAGE_POISONING_ZERO was removed in v5.11.
+ # Starting from v5.11 CONFIG_PAGE_POISONING unconditionally checks
+ # the 0xAA poison pattern on allocation.
+ # That brings higher performance penalty.
+ l += [OR(KconfigCheck('self_protection', 'kspp', 'EFI_DISABLE_PCI_DMA', 'y'),
+ efi_not_set)]
+ l += [OR(KconfigCheck('self_protection', 'kspp', 'RESET_ATTACK_MITIGATION', 'y'),
+ efi_not_set)] # needs userspace support (systemd)
+ ubsan_bounds_is_set = KconfigCheck('self_protection', 'kspp', 'UBSAN_BOUNDS', 'y')
+ l += [ubsan_bounds_is_set]
+ l += [OR(KconfigCheck('self_protection', 'kspp', 'UBSAN_LOCAL_BOUNDS', 'y'),
+ AND(ubsan_bounds_is_set,
+ cc_is_gcc))]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'UBSAN_TRAP', 'y'),
+ ubsan_bounds_is_set,
+ KconfigCheck('self_protection', 'kspp', 'UBSAN_SHIFT', 'is not set'),
+ KconfigCheck('self_protection', 'kspp', 'UBSAN_DIV_ZERO', 'is not set'),
+ KconfigCheck('self_protection', 'kspp', 'UBSAN_UNREACHABLE', 'is not set'),
+ KconfigCheck('self_protection', 'kspp', 'UBSAN_BOOL', 'is not set'),
+ KconfigCheck('self_protection', 'kspp', 'UBSAN_ENUM', 'is not set'),
+ KconfigCheck('self_protection', 'kspp', 'UBSAN_ALIGNMENT', 'is not set'))] # only array index bounds checking with traps
+ if arch in ('X86_64', 'ARM64', 'X86_32'):
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'UBSAN_SANITIZE_ALL', 'y'),
+ ubsan_bounds_is_set)] # ARCH_HAS_UBSAN_SANITIZE_ALL is not enabled for ARM
+ stackleak_is_set = KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_STACKLEAK', 'y')
+ l += [AND(stackleak_is_set, gcc_plugins_support_is_set)]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'STACKLEAK_METRICS', 'is not set'),
+ stackleak_is_set,
+ gcc_plugins_support_is_set)]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'STACKLEAK_RUNTIME_DISABLE', 'is not set'),
+ stackleak_is_set,
+ gcc_plugins_support_is_set)]
+ l += [KconfigCheck('self_protection', 'kspp', 'RANDOMIZE_KSTACK_OFFSET_DEFAULT', 'y')]
+ if arch in ('X86_64', 'ARM64'):
+ cfi_clang_is_set = KconfigCheck('self_protection', 'kspp', 'CFI_CLANG', 'y')
+ l += [cfi_clang_is_set]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'CFI_PERMISSIVE', 'is not set'),
+ cfi_clang_is_set)]
+ if arch in ('X86_64', 'X86_32'):
+ l += [KconfigCheck('self_protection', 'kspp', 'SCHED_CORE', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'DEFAULT_MMAP_MIN_ADDR', '65536')]
+ l += [KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_DMA_STRICT', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_PASSTHROUGH', 'is not set')] # true if IOMMU_DEFAULT_DMA_STRICT is set
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'INTEL_IOMMU_DEFAULT_ON', 'y'),
+ iommu_support_is_set)]
+ if arch in ('ARM64', 'ARM'):
+ l += [KconfigCheck('self_protection', 'kspp', 'DEBUG_WX', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'WERROR', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'DEFAULT_MMAP_MIN_ADDR', '32768')]
+ l += [KconfigCheck('self_protection', 'kspp', 'SYN_COOKIES', 'y')] # another reason?
+ if arch == 'X86_64':
+ l += [KconfigCheck('self_protection', 'kspp', 'SLS', 'y')] # vs CVE-2021-26341 in Straight-Line-Speculation
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'INTEL_IOMMU_SVM', 'y'),
+ iommu_support_is_set)]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'AMD_IOMMU_V2', 'y'),
+ iommu_support_is_set)]
+ if arch == 'ARM64':
+ l += [KconfigCheck('self_protection', 'kspp', 'ARM64_SW_TTBR0_PAN', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'SHADOW_CALL_STACK', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'KASAN_HW_TAGS', 'y')] # see also: kasan=on, kasan.stacktrace=off, kasan.fault=panic
+ if arch == 'X86_32':
+ l += [KconfigCheck('self_protection', 'kspp', 'PAGE_TABLE_ISOLATION', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'HIGHMEM64G', 'y')]
+ l += [KconfigCheck('self_protection', 'kspp', 'X86_PAE', 'y')]
+ l += [AND(KconfigCheck('self_protection', 'kspp', 'INTEL_IOMMU', 'y'),
+ iommu_support_is_set)]
+
+ # 'self_protection', 'clipos'
+ l += [KconfigCheck('self_protection', 'clipos', 'SLAB_MERGE_DEFAULT', 'is not set')]
+
+ # 'security_policy'
+ if arch in ('X86_64', 'ARM64', 'X86_32'):
+ l += [KconfigCheck('security_policy', 'defconfig', 'SECURITY', 'y')] # and choose your favourite LSM
+ if arch == 'ARM':
+ l += [KconfigCheck('security_policy', 'kspp', 'SECURITY', 'y')] # and choose your favourite LSM
+ l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_YAMA', 'y')]
+ l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_LANDLOCK', 'y')]
+ l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_SELINUX_DISABLE', 'is not set')]
+ l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_SELINUX_BOOTPARAM', 'is not set')]
+ l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_SELINUX_DEVELOP', 'is not set')]
+ l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_LOCKDOWN_LSM', 'y')]
+ l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_LOCKDOWN_LSM_EARLY', 'y')]
+ l += [KconfigCheck('security_policy', 'kspp', 'LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY', 'y')]
+ l += [KconfigCheck('security_policy', 'kspp', 'SECURITY_WRITABLE_HOOKS', 'is not set')] # refers to SECURITY_SELINUX_DISABLE
+
+ # 'cut_attack_surface', 'defconfig'
+ l += [KconfigCheck('cut_attack_surface', 'defconfig', 'SECCOMP', 'y')]
+ l += [KconfigCheck('cut_attack_surface', 'defconfig', 'SECCOMP_FILTER', 'y')]
+ l += [OR(KconfigCheck('cut_attack_surface', 'defconfig', 'BPF_UNPRIV_DEFAULT_OFF', 'y'),
+ bpf_syscall_not_set)] # see unprivileged_bpf_disabled
+ if arch in ('X86_64', 'ARM64', 'X86_32'):
+ l += [OR(KconfigCheck('cut_attack_surface', 'defconfig', 'STRICT_DEVMEM', 'y'),
+ devmem_not_set)] # refers to LOCKDOWN
+ if arch in ('X86_64', 'X86_32'):
+ l += [KconfigCheck('cut_attack_surface', 'defconfig', 'X86_INTEL_TSX_MODE_OFF', 'y')] # tsx=off
+
+ # 'cut_attack_surface', 'kspp'
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'SECURITY_DMESG_RESTRICT', 'y')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'ACPI_CUSTOM_METHOD', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT_BRK', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'DEVKMEM', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT_VDSO', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'BINFMT_MISC', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'INET_DIAG', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'KEXEC', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'PROC_KCORE', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_PTYS', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'HIBERNATION', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'IA32_EMULATION', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'X86_X32', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'X86_X32_ABI', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'MODIFY_LDT_SYSCALL', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'OABI_COMPAT', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'X86_MSR', 'is not set')] # refers to LOCKDOWN
+ l += [modules_not_set]
+ l += [devmem_not_set]
+ l += [OR(KconfigCheck('cut_attack_surface', 'kspp', 'IO_STRICT_DEVMEM', 'y'),
+ devmem_not_set)] # refers to LOCKDOWN
+ l += [AND(KconfigCheck('cut_attack_surface', 'kspp', 'LDISC_AUTOLOAD', 'is not set'),
+ KconfigCheck('cut_attack_surface', 'kspp', 'LDISC_AUTOLOAD', 'is present'))]
+ if arch == 'X86_64':
+ l += [KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_VSYSCALL_NONE', 'y')] # 'vsyscall=none'
+ if arch == 'ARM':
+ l += [OR(KconfigCheck('cut_attack_surface', 'kspp', 'STRICT_DEVMEM', 'y'),
+ devmem_not_set)] # refers to LOCKDOWN
+
+ # 'cut_attack_surface', 'grsec'
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'ZSMALLOC_STAT', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'PAGE_OWNER', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'DEBUG_KMEMLEAK', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'BINFMT_AOUT', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'KPROBE_EVENTS', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'UPROBE_EVENTS', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'GENERIC_TRACER', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'FUNCTION_TRACER', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'STACK_TRACER', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'HIST_TRIGGERS', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'BLK_DEV_IO_TRACE', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'PROC_VMCORE', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'PROC_PAGE_MONITOR', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'USELIB', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'CHECKPOINT_RESTORE', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'USERFAULTFD', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'HWPOISON_INJECT', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'MEM_SOFT_DIRTY', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'DEVPORT', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'DEBUG_FS', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'NOTIFIER_ERROR_INJECTION', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'FAIL_FUTEX', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'PUNIT_ATOM_DEBUG', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'ACPI_CONFIGFS', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'EDAC_DEBUG', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'DRM_I915_DEBUG', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'BCACHE_CLOSURES_DEBUG', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'DVB_C8SECTPFE', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'MTD_SLRAM', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'MTD_PHRAM', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'IO_URING', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'KCMP', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'RSEQ', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'LATENCYTOP', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'KCOV', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'PROVIDE_OHCI1394_DMA_INIT', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'grsec', 'SUNRPC_DEBUG', 'is not set')]
+ l += [AND(KconfigCheck('cut_attack_surface', 'grsec', 'PTDUMP_DEBUGFS', 'is not set'),
+ KconfigCheck('cut_attack_surface', 'grsec', 'X86_PTDUMP', 'is not set'))]
+
+ # 'cut_attack_surface', 'maintainer'
+ l += [KconfigCheck('cut_attack_surface', 'maintainer', 'DRM_LEGACY', 'is not set')] # recommended by Daniel Vetter in /issues/38
+ l += [KconfigCheck('cut_attack_surface', 'maintainer', 'FB', 'is not set')] # recommended by Daniel Vetter in /issues/38
+ l += [KconfigCheck('cut_attack_surface', 'maintainer', 'VT', 'is not set')] # recommended by Daniel Vetter in /issues/38
+ l += [KconfigCheck('cut_attack_surface', 'maintainer', 'BLK_DEV_FD', 'is not set')] # recommended by Denis Efremov in /pull/54
+ l += [KconfigCheck('cut_attack_surface', 'maintainer', 'BLK_DEV_FD_RAWCMD', 'is not set')] # recommended by Denis Efremov in /pull/62
+ l += [KconfigCheck('cut_attack_surface', 'maintainer', 'NOUVEAU_LEGACY_CTX_SUPPORT', 'is not set')]
+ # recommended by Dave Airlie in kernel commit b30a43ac7132cdda
+
+ # 'cut_attack_surface', 'clipos'
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'STAGING', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'KSM', 'is not set')] # to prevent FLUSH+RELOAD attack
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'KALLSYMS', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'X86_VSYSCALL_EMULATION', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'MAGIC_SYSRQ', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'KEXEC_FILE', 'is not set')] # refers to LOCKDOWN (permissive)
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'USER_NS', 'is not set')] # user.max_user_namespaces=0
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'X86_CPUID', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'X86_IOPL_IOPERM', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'ACPI_TABLE_UPGRADE', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'EFI_CUSTOM_SSDT_OVERLAYS', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'clipos', 'COREDUMP', 'is not set')] # cut userspace attack surface
+# l += [KconfigCheck('cut_attack_surface', 'clipos', 'IKCONFIG', 'is not set')] # no, IKCONFIG is needed for this check :)
+
+ # 'cut_attack_surface', 'lockdown'
+ l += [KconfigCheck('cut_attack_surface', 'lockdown', 'EFI_TEST', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'lockdown', 'MMIOTRACE_TEST', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'lockdown', 'KPROBES', 'is not set')] # refers to LOCKDOWN
+ l += [bpf_syscall_not_set] # refers to LOCKDOWN
+
+ # 'cut_attack_surface', 'my'
+ l += [KconfigCheck('cut_attack_surface', 'my', 'MMIOTRACE', 'is not set')] # refers to LOCKDOWN (permissive)
+ l += [KconfigCheck('cut_attack_surface', 'my', 'LIVEPATCH', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'my', 'IP_DCCP', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'my', 'IP_SCTP', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'my', 'FTRACE', 'is not set')] # refers to LOCKDOWN
+ l += [KconfigCheck('cut_attack_surface', 'my', 'VIDEO_VIVID', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'my', 'INPUT_EVBUG', 'is not set')] # Can be used as a keylogger
+ l += [KconfigCheck('cut_attack_surface', 'my', 'KGDB', 'is not set')]
+ l += [KconfigCheck('cut_attack_surface', 'my', 'AIO', 'is not set')]
+ l += [OR(KconfigCheck('cut_attack_surface', 'my', 'TRIM_UNUSED_KSYMS', 'y'),
+ modules_not_set)]
+
+ # 'harden_userspace'
+ if arch in ('X86_64', 'ARM64', 'X86_32'):
+ l += [KconfigCheck('harden_userspace', 'defconfig', 'INTEGRITY', 'y')]
+ if arch == 'ARM':
+ l += [KconfigCheck('harden_userspace', 'my', 'INTEGRITY', 'y')]
+ if arch == 'ARM64':
+ l += [KconfigCheck('harden_userspace', 'defconfig', 'ARM64_PTR_AUTH', 'y')]
+ l += [KconfigCheck('harden_userspace', 'defconfig', 'ARM64_BTI', 'y')]
+ if arch in ('ARM', 'X86_32'):
+ l += [KconfigCheck('harden_userspace', 'defconfig', 'VMSPLIT_3G', 'y')]
+ if arch in ('X86_64', 'ARM64'):
+ l += [KconfigCheck('harden_userspace', 'clipos', 'ARCH_MMAP_RND_BITS', '32')]
+ if arch in ('X86_32', 'ARM'):
+ l += [KconfigCheck('harden_userspace', 'my', 'ARCH_MMAP_RND_BITS', '16')]
+
+
+def add_cmdline_checks(l, arch):
+ # Calling the CmdlineCheck class constructor:
+ # CmdlineCheck(reason, decision, name, expected)
+ #
+ # [!] Don't add CmdlineChecks in add_kconfig_checks() to avoid wrong results
+ # when the tool doesn't check the cmdline.
+ #
+ # [!] Make sure that values of the options in CmdlineChecks need normalization.
+ # For more info see normalize_cmdline_options().
+ #
+ # A common pattern for checking the 'param_x' cmdline parameter
+ # that __overrides__ the 'PARAM_X_DEFAULT' kconfig option:
+ # l += [OR(CmdlineCheck(reason, decision, 'param_x', '1'),
+ # AND(KconfigCheck(reason, decision, 'PARAM_X_DEFAULT_ON', 'y'),
+ # CmdlineCheck(reason, decision, 'param_x, 'is not set')))]
+ #
+ # Here we don't check the kconfig options or minimal kernel version
+ # required for the cmdline parameters. That would make the checks
+ # very complex and not give a 100% guarantee anyway.
+
+ # 'self_protection', 'defconfig'
+ l += [CmdlineCheck('self_protection', 'defconfig', 'nosmep', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'nosmap', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'nokaslr', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'nopti', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'nospectre_v1', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'nospectre_v2', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'nospectre_bhb', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'nospec_store_bypass_disable', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'arm64.nobti', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'arm64.nopauth', 'is not set')]
+ l += [CmdlineCheck('self_protection', 'defconfig', 'arm64.nomte', 'is not set')]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'spectre_v2', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'spectre_v2', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'spectre_v2_user', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'spectre_v2_user', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'spec_store_bypass_disable', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'spec_store_bypass_disable', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'l1tf', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'l1tf', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'mds', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'mds', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'tsx_async_abort', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'tsx_async_abort', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'srbds', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'srbds', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'mmio_stale_data', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'mmio_stale_data', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'retbleed', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'retbleed', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'kpti', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'kpti', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'kvm.nx_huge_pages', 'is not off'),
+ CmdlineCheck('self_protection', 'defconfig', 'kvm.nx_huge_pages', 'is not set'))]
+ if arch == 'ARM64':
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'ssbd', 'kernel'),
+ CmdlineCheck('self_protection', 'my', 'ssbd', 'force-on'),
+ CmdlineCheck('self_protection', 'defconfig', 'ssbd', 'is not set'))]
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'rodata', 'full'),
+ AND(KconfigCheck('self_protection', 'defconfig', 'RODATA_FULL_DEFAULT_ENABLED', 'y'),
+ CmdlineCheck('self_protection', 'defconfig', 'rodata', 'is not set')))]
+ else:
+ l += [OR(CmdlineCheck('self_protection', 'defconfig', 'rodata', '1'),
+ CmdlineCheck('self_protection', 'defconfig', 'rodata', 'is not set'))]
+
+ # 'self_protection', 'kspp'
+ l += [CmdlineCheck('self_protection', 'kspp', 'nosmt', 'is present')]
+ l += [CmdlineCheck('self_protection', 'kspp', 'mitigations', 'auto,nosmt')] # 'nosmt' by kspp + 'auto' by defconfig
+ l += [OR(CmdlineCheck('self_protection', 'kspp', 'init_on_alloc', '1'),
+ AND(KconfigCheck('self_protection', 'kspp', 'INIT_ON_ALLOC_DEFAULT_ON', 'y'),
+ CmdlineCheck('self_protection', 'kspp', 'init_on_alloc', 'is not set')))]
+ l += [OR(CmdlineCheck('self_protection', 'kspp', 'init_on_free', '1'),
+ AND(KconfigCheck('self_protection', 'kspp', 'INIT_ON_FREE_DEFAULT_ON', 'y'),
+ CmdlineCheck('self_protection', 'kspp', 'init_on_free', 'is not set')),
+ AND(CmdlineCheck('self_protection', 'kspp', 'page_poison', '1'),
+ KconfigCheck('self_protection', 'kspp', 'PAGE_POISONING_ZERO', 'y'),
+ CmdlineCheck('self_protection', 'kspp', 'slub_debug', 'P')))]
+ l += [OR(CmdlineCheck('self_protection', 'kspp', 'slab_nomerge', 'is present'),
+ AND(KconfigCheck('self_protection', 'clipos', 'SLAB_MERGE_DEFAULT', 'is not set'),
+ CmdlineCheck('self_protection', 'kspp', 'slab_merge', 'is not set'),
+ CmdlineCheck('self_protection', 'clipos', 'slub_merge', 'is not set')))]
+ l += [OR(CmdlineCheck('self_protection', 'kspp', 'iommu.strict', '1'),
+ AND(KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_DMA_STRICT', 'y'),
+ CmdlineCheck('self_protection', 'kspp', 'iommu.strict', 'is not set')))]
+ l += [OR(CmdlineCheck('self_protection', 'kspp', 'iommu.passthrough', '0'),
+ AND(KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_PASSTHROUGH', 'is not set'),
+ CmdlineCheck('self_protection', 'kspp', 'iommu.passthrough', 'is not set')))]
+ # The cmdline checks compatible with the kconfig recommendations of the KSPP project...
+ l += [OR(CmdlineCheck('self_protection', 'kspp', 'hardened_usercopy', '1'),
+ AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY', 'y'),
+ CmdlineCheck('self_protection', 'kspp', 'hardened_usercopy', 'is not set')))]
+ l += [OR(CmdlineCheck('self_protection', 'kspp', 'slab_common.usercopy_fallback', '0'),
+ AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'),
+ CmdlineCheck('self_protection', 'kspp', 'slab_common.usercopy_fallback', 'is not set')))]
+ # ... the end
+ if arch in ('X86_64', 'ARM64', 'X86_32'):
+ l += [OR(CmdlineCheck('self_protection', 'kspp', 'randomize_kstack_offset', '1'),
+ AND(KconfigCheck('self_protection', 'kspp', 'RANDOMIZE_KSTACK_OFFSET_DEFAULT', 'y'),
+ CmdlineCheck('self_protection', 'kspp', 'randomize_kstack_offset', 'is not set')))]
+ if arch in ('X86_64', 'X86_32'):
+ l += [AND(CmdlineCheck('self_protection', 'kspp', 'pti', 'on'),
+ CmdlineCheck('self_protection', 'defconfig', 'nopti', 'is not set'))]
+
+ # 'self_protection', 'clipos'
+ l += [CmdlineCheck('self_protection', 'clipos', 'page_alloc.shuffle', '1')]
+ if arch in ('X86_64', 'X86_32'):
+ l += [CmdlineCheck('self_protection', 'clipos', 'iommu', 'force')]
+
+ # 'cut_attack_surface', 'defconfig'
+ if arch in ('X86_64', 'X86_32'):
+ l += [OR(CmdlineCheck('cut_attack_surface', 'defconfig', 'tsx', 'off'),
+ AND(KconfigCheck('cut_attack_surface', 'defconfig', 'X86_INTEL_TSX_MODE_OFF', 'y'),
+ CmdlineCheck('cut_attack_surface', 'defconfig', 'tsx', 'is not set')))]
+
+ # 'cut_attack_surface', 'kspp'
+ if arch == 'X86_64':
+ l += [OR(CmdlineCheck('cut_attack_surface', 'kspp', 'vsyscall', 'none'),
+ AND(KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_VSYSCALL_NONE', 'y'),
+ CmdlineCheck('cut_attack_surface', 'kspp', 'vsyscall', 'is not set')))]
+
+ # 'cut_attack_surface', 'grsec'
+ # The cmdline checks compatible with the kconfig options disabled by grsecurity...
+ l += [OR(CmdlineCheck('cut_attack_surface', 'grsec', 'debugfs', 'off'),
+ KconfigCheck('cut_attack_surface', 'grsec', 'DEBUG_FS', 'is not set'))] # ... the end
+
+ # 'cut_attack_surface', 'my'
+ l += [CmdlineCheck('cut_attack_surface', 'my', 'sysrq_always_enabled', 'is not set')]
+
+
+def normalize_cmdline_options(option, value):
+ # Don't normalize the cmdline option values if
+ # the Linux kernel doesn't use kstrtobool() for them
+ if option == 'debugfs':
+ # See debugfs_kernel() in fs/debugfs/inode.c
+ return value
+ if option == 'mitigations':
+ # See mitigations_parse_cmdline() in kernel/cpu.c
+ return value
+ if option == 'pti':
+ # See pti_check_boottime_disable() in arch/x86/mm/pti.c
+ return value
+ if option == 'spectre_v2':
+ # See spectre_v2_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
+ return value
+ if option == 'spectre_v2_user':
+ # See spectre_v2_parse_user_cmdline() in arch/x86/kernel/cpu/bugs.c
+ return value
+ if option == 'spec_store_bypass_disable':
+ # See ssb_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
+ return value
+ if option == 'l1tf':
+ # See l1tf_cmdline() in arch/x86/kernel/cpu/bugs.c
+ return value
+ if option == 'mds':
+ # See mds_cmdline() in arch/x86/kernel/cpu/bugs.c
+ return value
+ if option == 'tsx_async_abort':
+ # See tsx_async_abort_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
+ return value
+ if option == 'srbds':
+ # See srbds_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
+ return value
+ if option == 'mmio_stale_data':
+ # See mmio_stale_data_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
+ return value
+ if option == 'retbleed':
+ # See retbleed_parse_cmdline() in arch/x86/kernel/cpu/bugs.c
+ return value
+ if option == 'tsx':
+ # See tsx_init() in arch/x86/kernel/cpu/tsx.c
+ return value
+
+ # Implement a limited part of the kstrtobool() logic
+ if value in ('1', 'on', 'On', 'ON', 'y', 'Y', 'yes', 'Yes', 'YES'):
+ return '1'
+ if value in ('0', 'off', 'Off', 'OFF', 'n', 'N', 'no', 'No', 'NO'):
+ return '0'
+
+ # Preserve unique values
+ return value
projects / kconfig-hardened-check.git / commitdiff