From: Alexander Popov <alex.popov@linux.com>
Date: Sun, 16 Jun 2024 04:03:29 +0000 (+0300)
Subject: Add the "kernel.sysrq" check
X-Git-Tag: v0.6.10~48
X-Git-Url: https://jxself.org/git/?a=commitdiff_plain;h=538af12944c3a16f5707db51f49b1f4d053300d0;p=kconfig-hardened-check.git

Add the "kernel.sysrq" check

Thanks to @thestinger.

Refers to #104.
---

diff --git a/kernel_hardening_checker/checks.py b/kernel_hardening_checker/checks.py
index fda5d46..0d6d703 100755
--- a/kernel_hardening_checker/checks.py
+++ b/kernel_hardening_checker/checks.py
@@ -674,7 +674,6 @@ def normalize_cmdline_options(option: str, value: str) -> str:
 #    vm.mmap_min_addr has a good value
 #    nosmt sysfs control file
 #    vm.mmap_rnd_bits=max (?)
-#    kernel.sysrq=0
 #    abi.vsyscall32 (any value except 2)
 #    kernel.oops_limit (think about a proper value)
 #    kernel.warn_limit (think about a proper value)
@@ -715,6 +714,10 @@ def add_sysctl_checks(l: List[ChecklistObjType], _arch: StrOrNone) -> None:
              AND(KconfigCheck('cut_attack_surface', 'kspp', 'MODULES', 'is not set'),
                  have_kconfig))] # radical, but may be useful in some cases
 
+    l += [OR(SysctlCheck('cut_attack_surface', 'a13xp0p0v', 'kernel.sysrq', '0'),
+             AND(KconfigCheck('cut_attack_surface', 'clipos', 'MAGIC_SYSRQ', 'is not set'),
+                 have_kconfig))]
+
     l += [SysctlCheck('harden_userspace', 'kspp', 'fs.protected_symlinks', '1')]
     l += [SysctlCheck('harden_userspace', 'kspp', 'fs.protected_hardlinks', '1')]
     l += [SysctlCheck('harden_userspace', 'kspp', 'fs.protected_fifos', '2')]