Improve the 'mitigations' 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 90a7daf75794ee284474c338b4eb139e1c51857d..fa0b9e031075398236b779ab5cf150c9bbed3cd8 100644 (file)
--- a/kconfig_hardened_check/__init__.py
+++ b/kconfig_hardened_check/__init__.py
@@ -13,7 +13,7 @@
 # N.B. Hardening sysctls:
 #    kernel.kptr_restrict=2 (or 1?)
 #    kernel.dmesg_restrict=1 (also see the kconfig option)
-#    kernel.perf_event_paranoid=3
+#    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
@@ -668,6 +668,7 @@ 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 += [OR(KconfigCheck('cut_attack_surface', 'my', 'TRIM_UNUSED_KSYMS', 'y'),
              modules_not_set)]
 
@@ -719,8 +720,6 @@ def add_cmdline_checks(l, arch):
     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', 'mitigations', 'is not off'),
-             CmdlineCheck('self_protection', 'defconfig', 'mitigations', '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'),
@@ -756,6 +755,7 @@ def add_cmdline_checks(l, arch):
 
     # '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')))]