Skip CPU-dependent checks if CPU is not supported

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

diff --git a/kernel_hardening_checker/checks.py b/kernel_hardening_checker/checks.py
index 94cf9504493fe0634465dfd07f31a78b9f19421e..ca014afc8fd9382fefd6a2572a52959093a0c7ce 100644 (file)
--- a/kernel_hardening_checker/checks.py
+++ b/kernel_hardening_checker/checks.py
@@ -61,20 +61,26 @@ def add_kconfig_checks(l, arch):
     if arch in ('X86_64', 'ARM64', 'ARM'):
         l += [vmap_stack_is_set]
     if arch in ('X86_64', 'X86_32'):
+        cpu_sup_amd_not_set=KconfigCheck('-', '-', 'CPU_SUP_AMD', 'is not set')
+        cpu_sup_intel_not_set=KconfigCheck('-', '-', 'CPU_SUP_INTEL', 'is not set')
         l += [KconfigCheck('self_protection', 'defconfig', 'SPECULATION_MITIGATIONS', 'y')]
         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 += [OR(KconfigCheck('self_protection', 'defconfig', 'X86_MCE_INTEL', 'y'),
+                 cpu_sup_intel_not_set)]
+        l += [OR(KconfigCheck('self_protection', 'defconfig', 'X86_MCE_AMD', 'y'),
+                 cpu_sup_amd_not_set)]
         l += [KconfigCheck('self_protection', 'defconfig', 'RETPOLINE', '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
         l += [OR(KconfigCheck('self_protection', 'defconfig', 'MICROCODE_INTEL', 'y'),
+                 cpu_sup_intel_not_set,
                  AND(microcode_is_set,
                      VersionCheck((6, 6, 0))))] # MICROCODE_INTEL was included in MICROCODE since v6.6
         l += [OR(KconfigCheck('self_protection', 'defconfig', 'MICROCODE_AMD', 'y'),
+                 cpu_sup_amd_not_set,
                  AND(microcode_is_set,
                      VersionCheck((6, 6, 0))))] # MICROCODE_AMD was included in MICROCODE since v6.6
         l += [OR(KconfigCheck('self_protection', 'defconfig', 'X86_SMAP', 'y'),
@@ -90,7 +96,8 @@ 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 += [OR(KconfigCheck('self_protection', 'defconfig', 'CPU_SRSO', 'y'),
+                 cpu_sup_amd_not_set)]
         l += [AND(KconfigCheck('self_protection', 'defconfig', 'INTEL_IOMMU', 'y'),
                   iommu_support_is_set)]
         l += [AND(KconfigCheck('self_protection', 'defconfig', 'AMD_IOMMU', 'y'),
@@ -274,7 +281,8 @@ def add_kconfig_checks(l, arch):
         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
+        l += [OR(KconfigCheck('cut_attack_surface', 'defconfig', 'X86_INTEL_TSX_MODE_OFF', 'y'), # tsx=off
+                 cpu_sup_intel_not_set)]
 
     # 'cut_attack_surface', 'kspp'
     l += [KconfigCheck('cut_attack_surface', 'kspp', 'SECURITY_DMESG_RESTRICT', 'y')]
@@ -548,9 +556,12 @@ def add_cmdline_checks(l, arch):
 
     # 'cut_attack_surface', 'defconfig'
     if arch in ('X86_64', 'X86_32'):
+        tsx_not_set = CmdlineCheck('cut_attack_surface', 'defconfig', 'tsx', 'is not set')
         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')))]
+                     tsx_not_set),
+                 AND(KconfigCheck('cut_attack_surface', 'defconfig', 'CPU_SUP_INTEL', 'is not set'),
+                     tsx_not_set))]
 
     # 'cut_attack_surface', 'kspp'
     l += [CmdlineCheck('cut_attack_surface', 'kspp', 'nosmt', 'is present')] # slow (high performance penalty)