Add a comment about `kernel.unprivileged_userns_clone` sysctl in Debian

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

diff --git a/kconfig_hardened_check/checks.py b/kconfig_hardened_check/checks.py
index feba3649e9fcaeb6bb9956461191b71cc6b80cae..8e52fd8fc27e98cbaa0af8c4c92ecd35b0408a9f 100644 (file)
--- a/kconfig_hardened_check/checks.py
+++ b/kconfig_hardened_check/checks.py
@@ -16,7 +16,7 @@ This module contains knowledge for checks.
 #    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
+#    user.max_user_namespaces=0 (for Debian, also see kernel.unprivileged_userns_clone)
 #    what about bpf_jit_enable?
 #    kernel.unprivileged_bpf_disabled=1
 #    net.core.bpf_jit_harden=2
@@ -166,9 +166,9 @@ def add_kconfig_checks(l, arch):
     hardened_usercopy_is_set = KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY', 'y')
     l += [hardened_usercopy_is_set]
     l += [AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'),
-              hardened_usercopy_is_set)]
+              hardened_usercopy_is_set)] # usercopy whitelist violations should be prohibited
     l += [AND(KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_PAGESPAN', 'is not set'),
-              hardened_usercopy_is_set)]
+              hardened_usercopy_is_set)] # this debugging for HARDENED_USERCOPY is not needed for security
     l += [AND(KconfigCheck('self_protection', 'kspp', 'GCC_PLUGIN_LATENT_ENTROPY', 'y'),
               gcc_plugins_support_is_set)]
     l += [OR(KconfigCheck('self_protection', 'kspp', 'MODULE_SIG', 'y'),