Add the "MAGIC_SYSRQ_SERIAL" check

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

diff --git a/kernel_hardening_checker/checks.py b/kernel_hardening_checker/checks.py
index fda5d46986f4f229c3e839f49f2107751005e907..42d9407b749e7141d8c1c3dd50091b0020e6ee5f 100755 (executable)
--- a/kernel_hardening_checker/checks.py
+++ b/kernel_hardening_checker/checks.py
@@ -421,6 +421,8 @@ def add_kconfig_checks(l: List[ChecklistObjType], arch: str) -> None:
     l += [KconfigCheck('cut_attack_surface', 'a13xp0p0v', 'BLK_DEV_WRITE_MOUNTED', 'is not set')]
     l += [OR(KconfigCheck('cut_attack_surface', 'a13xp0p0v', 'TRIM_UNUSED_KSYMS', 'y'),
              modules_not_set)]
+    l += [OR(KconfigCheck('cut_attack_surface', 'a13xp0p0v', 'MAGIC_SYSRQ_SERIAL', 'is not set'),
+             KconfigCheck('cut_attack_surface', 'a13xp0p0v', 'MAGIC_SYSRQ_DEFAULT_ENABLE', '0x0'))]
 
 
     # 'harden_userspace'
@@ -674,7 +676,6 @@ 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 +716,10 @@ 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')]