Fix the 'decision' for the slub_merge check

[kconfig-hardened-check.git] / kconfig_hardened_check / __init__.py

diff --git a/kconfig_hardened_check/__init__.py b/kconfig_hardened_check/__init__.py
index 48040dc69bdc55715ff90925407356241929df39..a3a3293797e2c4ba0bba5906e5c7dd2dcf613a41 100644 (file)
--- a/kconfig_hardened_check/__init__.py
+++ b/kconfig_hardened_check/__init__.py
@@ -10,14 +10,6 @@
 # Please don't cry if my Python code looks like C.
 #
 #
-# N.B Missing hardening command line parameters:
-#    iommu=force (does it help against DMA attacks?)
-#
-#    Hardware tag-based KASAN with arm64 Memory Tagging Extension (MTE):
-#           kasan=on
-#           kasan.stacktrace=off
-#           kasan.fault=panic
-#
 # N.B. Hardening sysctls:
 #    kernel.kptr_restrict=2 (or 1?)
 #    kernel.dmesg_restrict=1 (also see the kconfig option)
@@ -74,7 +66,7 @@ class OptCheck:
                'invalid expected value "{}" for "{}" check (1)'.format(expected, name)
         val_len = len(expected.split())
         if val_len == 3:
-            assert(expected == 'is not set' or expected == 'is not off'), \
+            assert(expected in ('is not set', 'is not off')), \
                    'invalid expected value "{}" for "{}" check (2)'.format(expected, name)
         elif val_len == 2:
             assert(expected == 'is present'), \
@@ -274,7 +266,7 @@ class AND(ComplexOptCheck):
                     self.result = 'FAIL: {} is not "{}"'.format(opt.name, opt.expected)
                 elif opt.result == 'FAIL: is not present':
                     self.result = 'FAIL: {} is not present'.format(opt.name)
-                elif opt.result == 'FAIL: is off' or opt.result == 'FAIL: is off, "0"':
+                elif opt.result in ('FAIL: is off', 'FAIL: is off, "0"'):
                     self.result = 'FAIL: {} is off'.format(opt.name)
                 elif opt.result == 'FAIL: is off, not found':
                     self.result = 'FAIL: {} is off, not found'.format(opt.name)
@@ -378,7 +370,7 @@ def add_kconfig_checks(l, arch):
              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'):
+    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')]
@@ -394,6 +386,8 @@ 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', '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')]
@@ -437,12 +431,9 @@ def add_kconfig_checks(l, arch):
     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', '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 += [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
-    l += [KconfigCheck('self_protection', 'kspp', 'SCHED_CORE', 'y')]
     randstruct_is_set = OR(KconfigCheck('self_protection', 'kspp', 'RANDSTRUCT_FULL', 'y'),
                            KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_RANDSTRUCT', 'y'))
     l += [randstruct_is_set]
@@ -509,7 +500,10 @@ 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', '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'):
@@ -526,7 +520,7 @@ def add_kconfig_checks(l, arch):
     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')]
+        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')]
@@ -745,6 +739,8 @@ def add_cmdline_checks(l, arch):
              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'),
@@ -769,7 +765,8 @@ def add_cmdline_checks(l, arch):
                  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', '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')))]
@@ -794,6 +791,8 @@ def add_cmdline_checks(l, arch):
 
     # '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'):
@@ -1103,12 +1102,16 @@ def main():
             parse_cmdline_file(parsed_cmdline_options, args.cmdline)
             populate_with_data(config_checklist, parsed_cmdline_options, 'cmdline')
 
-        # now everything is ready for performing the checks
+        # now everything is ready, perform the checks
         perform_checks(config_checklist)
 
-        # finally print the results
         if mode == 'verbose':
-            print_unknown_options(config_checklist, parsed_kconfig_options)
+            # print the parsed options without the checks (for debugging)
+            all_parsed_options = parsed_kconfig_options # assignment does not copy
+            all_parsed_options.update(parsed_cmdline_options)
+            print_unknown_options(config_checklist, all_parsed_options)
+
+        # finally print the results
         print_checklist(mode, config_checklist, True)
 
         sys.exit(0)