have_config_file))]
l += [SysctlCheck('cut_attack_surface', 'kspp', 'user.max_user_namespaces', '0')] # may break the upower daemon in Ubuntu
l += [SysctlCheck('cut_attack_surface', 'kspp', 'dev.tty.ldisc_autoload', '0')]
- l += [SysctlCheck('cut_attack_surface', 'kspp', 'kernel.unprivileged_bpf_disabled', '1')]
+ l += [OR(SysctlCheck('cut_attack_surface', 'kspp', 'kernel.unprivileged_bpf_disabled', '1'),
+ AND(KconfigCheck('cut_attack_surface', 'lockdown', 'BPF_SYSCALL', 'is not set'),
+ have_config_file))]
l += [SysctlCheck('cut_attack_surface', 'kspp', 'kernel.kptr_restrict', '2')]
- l += [SysctlCheck('cut_attack_surface', 'kspp', 'dev.tty.legacy_tiocsti', '0')]
- l += [SysctlCheck('cut_attack_surface', 'kspp', 'vm.unprivileged_userfaultfd', '0')]
+ l += [OR(SysctlCheck('cut_attack_surface', 'kspp', 'dev.tty.legacy_tiocsti', '0'),
+ SysctlCheck('cut_attack_surface', 'kspp', 'dev.tty.legacy_tiocsti', 'is not set'))]
+ l += [OR(SysctlCheck('cut_attack_surface', 'kspp', 'vm.unprivileged_userfaultfd', '0'),
+ AND(KconfigCheck('cut_attack_surface', 'grsec', 'USERFAULTFD', 'is not set'),
+ have_config_file))]
# At first, it disabled unprivileged userfaultfd,
# and since v5.11 it enables unprivileged userfaultfd for user-mode only.
- l += [SysctlCheck('cut_attack_surface', 'clipos', 'kernel.modules_disabled', '1')] # radical, but may be useful in some cases
+ l += [OR(SysctlCheck('cut_attack_surface', 'clipos', 'kernel.modules_disabled', '1'), # radical, but may be useful in some cases
+ AND(KconfigCheck('cut_attack_surface', 'kspp', 'MODULES', 'is not set'),
+ have_config_file))]
l += [SysctlCheck('harden_userspace', 'kspp', 'fs.protected_symlinks', '1')]
l += [SysctlCheck('harden_userspace', 'kspp', 'fs.protected_hardlinks', '1')]