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kernel-hardening-checker
Commit 7509302a by Alexander Popov
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Reorder some checking rules for better looking code

parent d64e0837
Showing with 29 additions and 28 deletions
kconfig_hardened_check/__init__.py
......@@ -275,15 +275,15 @@ def construct_checklist(checklist, arch):
# 'self_protection', 'defconfig'
checklist.append(OptCheck('self_protection', 'defconfig', 'BUG', 'y'))
checklist.append(OR(OptCheck('self_protection', 'defconfig', 'STRICT_KERNEL_RWX', 'y'), \
OptCheck('self_protection', 'defconfig', 'DEBUG_RODATA', 'y'))) # before v4.11
checklist.append(OptCheck('self_protection', 'defconfig', 'SLUB_DEBUG', 'y'))
checklist.append(OptCheck('self_protection', 'defconfig', 'GCC_PLUGINS', 'y'))
checklist.append(OR(OptCheck('self_protection', 'defconfig', 'STACKPROTECTOR_STRONG', 'y'), \
OptCheck('self_protection', 'defconfig', 'CC_STACKPROTECTOR_STRONG', 'y')))
checklist.append(OptCheck('self_protection', 'defconfig', 'SLUB_DEBUG', 'y'))
checklist.append(OR(OptCheck('self_protection', 'defconfig', 'STRICT_KERNEL_RWX', 'y'), \
OptCheck('self_protection', 'defconfig', 'DEBUG_RODATA', 'y'))) # before v4.11
checklist.append(OR(OptCheck('self_protection', 'defconfig', 'STRICT_MODULE_RWX', 'y'), \
OptCheck('self_protection', 'defconfig', 'DEBUG_SET_MODULE_RONX', 'y'), \
modules_not_set)) # DEBUG_SET_MODULE_RONX was before v4.11
checklist.append(OptCheck('self_protection', 'defconfig', 'GCC_PLUGINS', 'y'))
checklist.append(OR(OptCheck('self_protection', 'defconfig', 'REFCOUNT_FULL', 'y'), \
VerCheck((5, 5)))) # REFCOUNT_FULL is enabled by default since v5.5
iommu_support_is_set = OptCheck('self_protection', 'defconfig', 'IOMMU_SUPPORT', 'y') # is needed for mitigating DMA attacks
......@@ -292,9 +292,9 @@ def construct_checklist(checklist, arch):
checklist.append(OptCheck('self_protection', 'defconfig', 'MICROCODE', 'y')) # is needed for mitigating CPU bugs
checklist.append(OptCheck('self_protection', 'defconfig', 'RETPOLINE', 'y'))
checklist.append(OptCheck('self_protection', 'defconfig', 'X86_SMAP', 'y'))
checklist.append(OptCheck('self_protection', 'defconfig', 'SYN_COOKIES', 'y')) # another reason?
checklist.append(OR(OptCheck('self_protection', 'defconfig', 'X86_UMIP', 'y'), \
OptCheck('self_protection', 'defconfig', 'X86_INTEL_UMIP', 'y')))
checklist.append(OptCheck('self_protection', 'defconfig', 'SYN_COOKIES', 'y')) # another reason?
if arch == 'X86_64':
checklist.append(OptCheck('self_protection', 'defconfig', 'PAGE_TABLE_ISOLATION', 'y'))
checklist.append(OptCheck('self_protection', 'defconfig', 'RANDOMIZE_MEMORY', 'y'))
......@@ -326,13 +326,14 @@ def construct_checklist(checklist, arch):
checklist.append(OptCheck('self_protection', 'kspp', 'SLAB_FREELIST_RANDOM', 'y'))
checklist.append(OptCheck('self_protection', 'kspp', 'SHUFFLE_PAGE_ALLOCATOR', 'y'))
checklist.append(OptCheck('self_protection', 'kspp', 'FORTIFY_SOURCE', 'y'))
randstruct_is_set = OptCheck('self_protection', 'kspp', 'GCC_PLUGIN_RANDSTRUCT', 'y')
checklist.append(randstruct_is_set)
checklist.append(OptCheck('self_protection', 'kspp', 'GCC_PLUGIN_LATENT_ENTROPY', 'y'))
checklist.append(OptCheck('self_protection', 'kspp', 'DEBUG_LIST', 'y'))
checklist.append(OptCheck('self_protection', 'kspp', 'DEBUG_SG', 'y'))
checklist.append(OptCheck('self_protection', 'kspp', 'DEBUG_CREDENTIALS', 'y'))
checklist.append(OptCheck('self_protection', 'kspp', 'DEBUG_NOTIFIERS', 'y'))
checklist.append(OptCheck('self_protection', 'kspp', 'INIT_ON_ALLOC_DEFAULT_ON', 'y'))
checklist.append(OptCheck('self_protection', 'kspp', 'GCC_PLUGIN_LATENT_ENTROPY', 'y'))
randstruct_is_set = OptCheck('self_protection', 'kspp', 'GCC_PLUGIN_RANDSTRUCT', 'y')
checklist.append(randstruct_is_set)
hardened_usercopy_is_set = OptCheck('self_protection', 'kspp', 'HARDENED_USERCOPY', 'y')
checklist.append(hardened_usercopy_is_set)
checklist.append(AND(OptCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'), \
......@@ -346,17 +347,12 @@ def construct_checklist(checklist, arch):
checklist.append(OR(OptCheck('self_protection', 'kspp', 'MODULE_SIG_FORCE', 'y'), \
modules_not_set)) # refers to LOCKDOWN
checklist.append(OR(OptCheck('self_protection', 'kspp', 'INIT_STACK_ALL', 'y'), \
OptCheck('self_protection', 'kspp', 'GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y')))
checklist.append(OptCheck('self_protection', 'kspp', 'INIT_ON_ALLOC_DEFAULT_ON', 'y'))
OptCheck('self_protection', 'kspp', 'GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y')))
checklist.append(OR(OptCheck('self_protection', 'kspp', 'INIT_ON_FREE_DEFAULT_ON', 'y'), \
OptCheck('self_protection', 'kspp', 'PAGE_POISONING', 'y'))) # before v5.3
if arch in ('X86_64', 'ARM64', 'X86_32'):
stackleak_is_set = OptCheck('self_protection', 'kspp', 'GCC_PLUGIN_STACKLEAK', 'y')
checklist.append(stackleak_is_set)
checklist.append(AND(OptCheck('self_protection', 'clipos', 'STACKLEAK_METRICS', 'is not set'), \
stackleak_is_set))
checklist.append(AND(OptCheck('self_protection', 'clipos', 'STACKLEAK_RUNTIME_DISABLE', 'is not set'), \
stackleak_is_set))
if arch in ('X86_64', 'X86_32'):
checklist.append(OptCheck('self_protection', 'kspp', 'DEFAULT_MMAP_MIN_ADDR', '65536'))
if arch == 'X86_32':
......@@ -374,10 +370,15 @@ def construct_checklist(checklist, arch):
checklist.append(OptCheck('self_protection', 'clipos', 'DEBUG_VIRTUAL', 'y'))
checklist.append(OptCheck('self_protection', 'clipos', 'STATIC_USERMODEHELPER', 'y')) # needs userspace support
checklist.append(OptCheck('self_protection', 'clipos', 'SLAB_MERGE_DEFAULT', 'is not set')) # slab_nomerge
checklist.append(AND(OptCheck('self_protection', 'clipos', 'GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set'), \
randstruct_is_set))
checklist.append(OptCheck('self_protection', 'clipos', 'RANDOM_TRUST_BOOTLOADER', 'is not set'))
checklist.append(OptCheck('self_protection', 'clipos', 'RANDOM_TRUST_CPU', 'is not set'))
checklist.append(AND(OptCheck('self_protection', 'clipos', 'GCC_PLUGIN_RANDSTRUCT_PERFORMANCE', 'is not set'), \
randstruct_is_set))
if arch in ('X86_64', 'ARM64', 'X86_32'):
checklist.append(AND(OptCheck('self_protection', 'clipos', 'STACKLEAK_METRICS', 'is not set'), \
stackleak_is_set))
checklist.append(AND(OptCheck('self_protection', 'clipos', 'STACKLEAK_RUNTIME_DISABLE', 'is not set'), \
stackleak_is_set))
if arch in ('X86_64', 'X86_32'):
checklist.append(AND(OptCheck('self_protection', 'clipos', 'INTEL_IOMMU_SVM', 'y'), \
iommu_support_is_set))
......@@ -405,11 +406,11 @@ def construct_checklist(checklist, arch):
checklist.append(OptCheck('security_policy', 'clipos', 'SECURITY_LOCKDOWN_LSM', 'y'))
checklist.append(OptCheck('security_policy', 'clipos', 'SECURITY_LOCKDOWN_LSM_EARLY', 'y'))
checklist.append(OptCheck('security_policy', 'clipos', 'LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY', 'y'))
checklist.append(OptCheck('security_policy', 'my', 'SECURITY_SAFESETID', 'y'))
loadpin_is_set = OptCheck('security_policy', 'my', 'SECURITY_LOADPIN', 'y') # needs userspace support
checklist.append(loadpin_is_set)
checklist.append(AND(OptCheck('security_policy', 'my', 'SECURITY_LOADPIN_ENFORCE', 'y'), \
loadpin_is_set))
checklist.append(OptCheck('security_policy', 'my', 'SECURITY_SAFESETID', 'y'))
# 'cut_attack_surface', 'defconfig'
checklist.append(OptCheck('cut_attack_surface', 'defconfig', 'SECCOMP', 'y'))
......@@ -419,15 +420,6 @@ def construct_checklist(checklist, arch):
devmem_not_set)) # refers to LOCKDOWN
# 'cut_attack_surface', 'kspp'
checklist.append(modules_not_set)
checklist.append(devmem_not_set)
checklist.append(OR(OptCheck('cut_attack_surface', 'kspp', 'IO_STRICT_DEVMEM', 'y'), \
devmem_not_set)) # refers to LOCKDOWN
if arch == 'ARM':
checklist.append(OR(OptCheck('cut_attack_surface', 'kspp', 'STRICT_DEVMEM', 'y'), \
devmem_not_set)) # refers to LOCKDOWN
if arch == 'X86_64':
checklist.append(OptCheck('cut_attack_surface', 'kspp', 'LEGACY_VSYSCALL_NONE', 'y')) # 'vsyscall=none'
checklist.append(OptCheck('cut_attack_surface', 'kspp', 'ACPI_CUSTOM_METHOD', 'is not set')) # refers to LOCKDOWN
checklist.append(OptCheck('cut_attack_surface', 'kspp', 'COMPAT_BRK', 'is not set'))
checklist.append(OptCheck('cut_attack_surface', 'kspp', 'DEVKMEM', 'is not set')) # refers to LOCKDOWN
......@@ -442,6 +434,15 @@ def construct_checklist(checklist, arch):
checklist.append(OptCheck('cut_attack_surface', 'kspp', 'X86_X32', 'is not set'))
checklist.append(OptCheck('cut_attack_surface', 'kspp', 'MODIFY_LDT_SYSCALL', 'is not set'))
checklist.append(OptCheck('cut_attack_surface', 'kspp', 'OABI_COMPAT', 'is not set'))
checklist.append(modules_not_set)
checklist.append(devmem_not_set)
checklist.append(OR(OptCheck('cut_attack_surface', 'kspp', 'IO_STRICT_DEVMEM', 'y'), \
devmem_not_set)) # refers to LOCKDOWN
if arch == 'ARM':
checklist.append(OR(OptCheck('cut_attack_surface', 'kspp', 'STRICT_DEVMEM', 'y'), \
devmem_not_set)) # refers to LOCKDOWN
if arch == 'X86_64':
checklist.append(OptCheck('cut_attack_surface', 'kspp', 'LEGACY_VSYSCALL_NONE', 'y')) # 'vsyscall=none'
# 'cut_attack_surface', 'grsecurity'
checklist.append(OptCheck('cut_attack_surface', 'grsecurity', 'X86_PTDUMP', 'is not set'))
......@@ -476,8 +477,6 @@ def construct_checklist(checklist, arch):
checklist.append(OptCheck('cut_attack_surface', 'lockdown', 'MMIOTRACE_TEST', 'is not set')) # refers to LOCKDOWN
# 'cut_attack_surface', 'clipos'
if arch in ('X86_64', 'X86_32'):
checklist.append(OptCheck('cut_attack_surface', 'clipos', 'X86_INTEL_TSX_MODE_OFF', 'y')) # tsx=off
checklist.append(OptCheck('cut_attack_surface', 'clipos', 'STAGING', 'is not set'))
checklist.append(OptCheck('cut_attack_surface', 'clipos', 'KSM', 'is not set')) # to prevent FLUSH+RELOAD attack
# checklist.append(OptCheck('cut_attack_surface', 'clipos', 'IKCONFIG', 'is not set')) # no, this info is needed for this check :)
......@@ -490,6 +489,8 @@ def construct_checklist(checklist, arch):
checklist.append(OptCheck('cut_attack_surface', 'clipos', 'X86_CPUID', 'is not set'))
checklist.append(AND(OptCheck('cut_attack_surface', 'clipos', 'LDISC_AUTOLOAD', 'is not set'), \
PresenceCheck('LDISC_AUTOLOAD')))
if arch in ('X86_64', 'X86_32'):
checklist.append(OptCheck('cut_attack_surface', 'clipos', 'X86_INTEL_TSX_MODE_OFF', 'y')) # tsx=off
# 'cut_attack_surface', 'grapheneos'
checklist.append(OptCheck('cut_attack_surface', 'grapheneos', 'AIO', 'is not set'))
......
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