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kernel-hardening-checker
Commit 328a89c7 by Alexander Popov
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Split into Python modules

parent 7799d8cf
Showing with 860 additions and 840 deletions
kconfig_hardened_check/__init__.py
#!/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!
......@@ -8,274 +7,18 @@
# 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):
......@@ -331,491 +74,6 @@ def detect_compiler(fname):
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 = []
......@@ -887,49 +145,6 @@ def print_checklist(mode, checklist, with_results):
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_\"]*")
......@@ -956,59 +171,6 @@ def parse_kconfig_file(parsed_options, fname):
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()
......
kconfig_hardened_check/checks.py 0 → 100644
#!/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
kconfig_hardened_check/engine.py 0 → 100644
#!/usr/bin/python3
# pylint: disable=missing-module-docstring,missing-class-docstring,missing-function-docstring
# pylint: disable=line-too-long,invalid-name,too-many-branches,too-many-statements
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
SIMPLE_OPTION_TYPES = ('kconfig', 'version', 'cmdline')
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()
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