SECURITY_DMESG_RESTRICT is recommended by KSPP now

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

diff --git a/kconfig_hardened_check/__init__.py b/kconfig_hardened_check/__init__.py
index 28ab04e105d342f201f51a2986619e739460f8b4..b2893d104f4946ff110d7e28f0a0480ba82c5065 100644 (file)
--- a/kconfig_hardened_check/__init__.py
+++ b/kconfig_hardened_check/__init__.py
@@ -15,15 +15,14 @@
 #    page_alloc.shuffle=1
 #    iommu=force (does it help against DMA attacks?)
 #    slub_debug=FZ (slow)
-#    page_poison=1 (if enabled)
-#    init_on_alloc=1
-#    init_on_free=1
+#    init_on_alloc=1 (since v5.3)
+#    init_on_free=1 (since v5.3, otherwise slub_debug=P and page_poison=1)
 #    loadpin.enforce=1
 #    debugfs=no-mount (or off if possible)
 #
 #    Mitigations of CPU vulnerabilities:
 #       Аrch-independent:
-#           mitigations=auto,nosmt
+#           mitigations=auto,nosmt (nosmt is slow)
 #       X86:
 #           spectre_v2=on
 #           pti=on
@@ -36,8 +35,8 @@
 #           ssbd=force-on
 #
 # N.B. Hardening sysctls:
-#    kernel.kptr_restrict=2
-#    kernel.dmesg_restrict=1
+#    kernel.kptr_restrict=2 (or 1?)
+#    kernel.dmesg_restrict=1 (also see the kconfig option)
 #    kernel.perf_event_paranoid=3
 #    kernel.kexec_load_disabled=1
 #    kernel.yama.ptrace_scope=3
@@ -329,6 +328,7 @@ def construct_checklist(l, arch):
         l += [OptCheck('self_protection', 'defconfig', 'HARDEN_BRANCH_PREDICTOR', 'y')]
 
     # 'self_protection', 'kspp'
+    l += [OptCheck('self_protection', 'kspp', 'SECURITY_DMESG_RESTRICT', 'y')]
     l += [OptCheck('self_protection', 'kspp', 'BUG_ON_DATA_CORRUPTION', 'y')]
     l += [OptCheck('self_protection', 'kspp', 'DEBUG_WX', 'y')]
     l += [OptCheck('self_protection', 'kspp', 'SCHED_STACK_END_CHECK', 'y')]
@@ -376,7 +376,6 @@ def construct_checklist(l, arch):
         l += [OptCheck('self_protection', 'kspp', 'DEFAULT_MMAP_MIN_ADDR', '32768')]
 
     # 'self_protection', 'clipos'
-    l += [OptCheck('self_protection', 'clipos', 'SECURITY_DMESG_RESTRICT', 'y')]
     l += [OptCheck('self_protection', 'clipos', 'DEBUG_VIRTUAL', 'y')]
     l += [OptCheck('self_protection', 'clipos', 'STATIC_USERMODEHELPER', 'y')] # needs userspace support
     l += [OptCheck('self_protection', 'clipos', 'EFI_DISABLE_PCI_DMA', 'y')]