X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=kernel_hardening_checker%2Fchecks.py;h=cf43f3347a5156895596b406a4e9f8b5aeeded2b;hb=e0b9932fb09f1396ef412d6d36ec34835c07450b;hp=5943e531fa192a0e5dfb5c7e9ad3a11cc1de745d;hpb=250cb52244d08493672adc142d60fe61514df02e;p=kconfig-hardened-check.git diff --git a/kernel_hardening_checker/checks.py b/kernel_hardening_checker/checks.py index 5943e53..cf43f33 100644 --- a/kernel_hardening_checker/checks.py +++ b/kernel_hardening_checker/checks.py @@ -9,7 +9,7 @@ This module contains knowledge for checks. """ # pylint: disable=missing-function-docstring,line-too-long,invalid-name -# pylint: disable=too-many-branches,too-many-statements +# pylint: disable=too-many-branches,too-many-statements,too-many-locals from .engine import KconfigCheck, CmdlineCheck, SysctlCheck, VersionCheck, OR, AND @@ -53,6 +53,8 @@ def add_kconfig_checks(l, arch): 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 + l += [OR(KconfigCheck('self_protection', 'defconfig', 'INIT_STACK_ALL_ZERO', 'y'), + KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y'))] if arch in ('X86_64', 'ARM64', 'X86_32'): l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_BASE', 'y')] if arch in ('X86_64', 'ARM64', 'ARM'): @@ -65,7 +67,6 @@ def add_kconfig_checks(l, arch): l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE_INTEL', 'y')] l += [KconfigCheck('self_protection', 'defconfig', 'X86_MCE_AMD', 'y')] l += [KconfigCheck('self_protection', 'defconfig', 'RETPOLINE', 'y')] - l += [KconfigCheck('self_protection', 'defconfig', 'CPU_SRSO', 'y')] l += [KconfigCheck('self_protection', 'defconfig', 'SYN_COOKIES', 'y')] # another reason? microcode_is_set = KconfigCheck('self_protection', 'defconfig', 'MICROCODE', 'y') l += [microcode_is_set] # is needed for mitigating CPU bugs @@ -80,6 +81,7 @@ def add_kconfig_checks(l, arch): 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', 'HW_RANDOM_TPM', 'y')] 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')] @@ -87,6 +89,7 @@ def add_kconfig_checks(l, arch): l += [KconfigCheck('self_protection', 'defconfig', 'PAGE_TABLE_ISOLATION', 'y')] l += [KconfigCheck('self_protection', 'defconfig', 'RANDOMIZE_MEMORY', 'y')] l += [KconfigCheck('self_protection', 'defconfig', 'X86_KERNEL_IBT', 'y')] + l += [KconfigCheck('self_protection', 'defconfig', 'CPU_SRSO', 'y')] l += [AND(KconfigCheck('self_protection', 'defconfig', 'INTEL_IOMMU', 'y'), iommu_support_is_set)] l += [AND(KconfigCheck('self_protection', 'defconfig', 'AMD_IOMMU', 'y'), @@ -126,8 +129,8 @@ def add_kconfig_checks(l, arch): 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', 'HW_RANDOM_TPM', 'y')] l += [KconfigCheck('self_protection', 'kspp', 'STATIC_USERMODEHELPER', 'y')] # needs userspace support + l += [KconfigCheck('self_protection', 'kspp', 'SCHED_CORE', 'y')] kfence_is_set = KconfigCheck('self_protection', 'kspp', 'KFENCE', 'y') l += [kfence_is_set] l += [AND(KconfigCheck('self_protection', 'my', 'KFENCE_SAMPLE_INTERVAL', 'is not off'), @@ -154,8 +157,6 @@ def add_kconfig_checks(l, arch): 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. @@ -180,9 +181,9 @@ def add_kconfig_checks(l, arch): 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 + l += [AND(KconfigCheck('self_protection', 'kspp', 'UBSAN_SANITIZE_ALL', 'y'), + ubsan_bounds_is_set)] 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'), @@ -198,7 +199,7 @@ def add_kconfig_checks(l, arch): 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', 'HW_RANDOM_TPM', '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 @@ -229,6 +230,10 @@ def add_kconfig_checks(l, arch): # 'self_protection', 'clipos' l += [KconfigCheck('self_protection', 'clipos', 'SLAB_MERGE_DEFAULT', 'is not set')] + # 'self_protection', 'my' + l += [KconfigCheck('self_protection', 'my', 'LIST_HARDENED', 'y')] + l += [KconfigCheck('self_protection', 'my', 'RANDOM_KMALLOC_CACHES', 'y')] + # 'security_policy' if arch in ('X86_64', 'ARM64', 'X86_32'): l += [KconfigCheck('security_policy', 'defconfig', 'SECURITY', 'y')] @@ -243,6 +248,7 @@ def add_kconfig_checks(l, arch): 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 + l += [KconfigCheck('security_policy', 'my', 'SECURITY_SELINUX_DEBUG', 'is not set')] l += [OR(KconfigCheck('security_policy', 'my', 'SECURITY_SELINUX', 'y'), KconfigCheck('security_policy', 'my', 'SECURITY_APPARMOR', 'y'), KconfigCheck('security_policy', 'my', 'SECURITY_SMACK', 'y'), @@ -277,6 +283,7 @@ def add_kconfig_checks(l, arch): 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 += [KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_TIOCSTI', 'is not set')] l += [modules_not_set] l += [devmem_not_set] l += [OR(KconfigCheck('cut_attack_surface', 'kspp', 'IO_STRICT_DEVMEM', 'y'), @@ -357,6 +364,7 @@ def add_kconfig_checks(l, arch): 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', 'AIO', 'is not set')] # l += [KconfigCheck('cut_attack_surface', 'clipos', 'IKCONFIG', 'is not set')] # no, IKCONFIG is needed for this check :) # 'cut_attack_surface', 'lockdown' @@ -366,7 +374,6 @@ def add_kconfig_checks(l, arch): l += [bpf_syscall_not_set] # refers to LOCKDOWN # 'cut_attack_surface', 'my' - l += [KconfigCheck('cut_attack_surface', 'my', 'LEGACY_TIOCSTI', 'is not set')] 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')] @@ -375,7 +382,6 @@ def add_kconfig_checks(l, arch): 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 += [KconfigCheck('cut_attack_surface', 'my', 'CORESIGHT', 'is not set')] l += [KconfigCheck('cut_attack_surface', 'my', 'XFS_SUPPORT_V4', 'is not set')] l += [OR(KconfigCheck('cut_attack_surface', 'my', 'TRIM_UNUSED_KSYMS', 'y'), @@ -499,8 +505,9 @@ def add_cmdline_checks(l, arch): CmdlineCheck('self_protection', 'kspp', 'hardened_usercopy', 'is not set')))] l += [AND(CmdlineCheck('self_protection', 'kspp', 'slab_common.usercopy_fallback', 'is not set'), KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'))] - # don't require slab_common.usercopy_fallback=0, - # since HARDENED_USERCOPY_FALLBACK was removed in Linux v5.16 + # Consequence of the HARDENED_USERCOPY_FALLBACK check by kspp. + # Don't require slab_common.usercopy_fallback=0, + # since HARDENED_USERCOPY_FALLBACK was removed in Linux v5.16. if arch in ('X86_64', 'ARM64', 'X86_32'): l += [OR(CmdlineCheck('self_protection', 'kspp', 'iommu.strict', '1'), AND(KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_DMA_STRICT', 'y'), @@ -537,15 +544,15 @@ def add_cmdline_checks(l, arch): KconfigCheck('cut_attack_surface', 'kspp', 'X86_VSYSCALL_EMULATION', 'is not set'), AND(KconfigCheck('cut_attack_surface', 'kspp', 'LEGACY_VSYSCALL_NONE', 'y'), CmdlineCheck('cut_attack_surface', 'kspp', 'vsyscall', 'is not set')))] - l += [OR(CmdlineCheck('cut_attack_surface', 'my', 'vdso32', '1'), - CmdlineCheck('cut_attack_surface', 'my', 'vdso32', '0'), + l += [OR(CmdlineCheck('cut_attack_surface', 'kspp', 'vdso32', '0'), + CmdlineCheck('cut_attack_surface', 'my', 'vdso32', '1'), AND(KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT_VDSO', 'is not set'), CmdlineCheck('cut_attack_surface', 'my', 'vdso32', 'is not set')))] # the vdso32 parameter must not be 2 if arch == 'X86_32': - l += [OR(CmdlineCheck('cut_attack_surface', 'my', 'vdso32', '1'), - CmdlineCheck('cut_attack_surface', 'my', 'vdso', '1'), - CmdlineCheck('cut_attack_surface', 'my', 'vdso32', '0'), + l += [OR(CmdlineCheck('cut_attack_surface', 'kspp', 'vdso32', '0'), CmdlineCheck('cut_attack_surface', 'my', 'vdso', '0'), + CmdlineCheck('cut_attack_surface', 'my', 'vdso32', '1'), + CmdlineCheck('cut_attack_surface', 'my', 'vdso', '1'), AND(KconfigCheck('cut_attack_surface', 'kspp', 'COMPAT_VDSO', 'is not set'), CmdlineCheck('cut_attack_surface', 'my', 'vdso32', 'is not set'), CmdlineCheck('cut_attack_surface', 'my', 'vdso', 'is not set')))] # the vdso and vdso32 parameters must not be 2 @@ -615,7 +622,7 @@ def normalize_cmdline_options(option, value): # kernel.warn_limit (think about a proper value) # net.ipv4.tcp_syncookies=1 (?) -def add_sysctl_checks(l, arch): +def add_sysctl_checks(l, _arch): # This function may be called with arch=None # Calling the SysctlCheck class constructor: