# kconfig-hardened-check
+
[](https://codecov.io/gh/a13xp0p0v/kconfig-hardened-check)
But nobody likes checking configs manually. So let the computers do their job!
-__kconfig-hardened-check.py__ helps me to check the Linux kernel options
+__kconfig-hardened-check__ helps me to check the Linux kernel options
against my security hardening preferences, which are based on the
- [KSPP recommended settings][1],
- [CLIP OS kernel configuration][2],
- Last public [grsecurity][3] patch (options which they disable),
- [SECURITY_LOCKDOWN_LSM][5] patchset,
- - Direct feedback from Linux kernel maintainers (see [#38][6], [#53][15], [#54][16], [#62][17]).
+ - [Direct feedback from the Linux kernel maintainers][23].
This tool supports checking __Kconfig__ options and __kernel cmdline__ parameters.
- ARM64
- ARM
-TODO: RISC-V
+TODO: RISC-V (the issue [#56][22])
## Installation
- `-m show_ok` for showing only the successful checks
- `-m json` for printing the results in JSON format (for combining `kconfig-hardened-check` with other tools)
-## Example output for `Ubuntu 20.04 LTS (Focal Fossa)` kernel config
+## Example output for `Fedora 34` kernel configuration
```
-$ ./bin/kconfig-hardened-check -c kconfig_hardened_check/config_files/distros/ubuntu-focal.config
-[+] Kconfig file to check: kconfig_hardened_check/config_files/distros/ubuntu-focal.config
+$ ./bin/kconfig-hardened-check -c /boot/config-5.19.4-200.fc36.x86_64 -l /proc/cmdline
+[+] Kconfig file to check: /boot/config-5.19.4-200.fc36.x86_64
+[+] Kernel cmdline file to check: /proc/cmdline
[+] Detected architecture: X86_64
-[+] Detected kernel version: 5.4
+[+] Detected kernel version: 5.19
+[+] Detected compiler: GCC 120201
=========================================================================================================================
option name | type |desired val | decision | reason | check result
=========================================================================================================================
CONFIG_BUG |kconfig| y |defconfig | self_protection | OK
CONFIG_SLUB_DEBUG |kconfig| y |defconfig | self_protection | OK
-CONFIG_GCC_PLUGINS |kconfig| y |defconfig | self_protection | FAIL: not found
+CONFIG_GCC_PLUGINS |kconfig| y |defconfig | self_protection | OK
CONFIG_STACKPROTECTOR |kconfig| y |defconfig | self_protection | OK
-CONFIG_STACKPROTECTOR_STRONG |kconfig| y |defconfig | self_protection | OK
+CONFIG_STACKPROTECTOR_STRONG |kconfig| y |defconfig | self_protection | FAIL: "is not set"
CONFIG_STRICT_KERNEL_RWX |kconfig| y |defconfig | self_protection | OK
CONFIG_STRICT_MODULE_RWX |kconfig| y |defconfig | self_protection | OK
-CONFIG_REFCOUNT_FULL |kconfig| y |defconfig | self_protection | FAIL: "is not set"
+CONFIG_REFCOUNT_FULL |kconfig| y |defconfig | self_protection | OK: version >= 5.5
CONFIG_THREAD_INFO_IN_TASK |kconfig| y |defconfig | self_protection | OK
CONFIG_IOMMU_SUPPORT |kconfig| y |defconfig | self_protection | OK
CONFIG_RANDOMIZE_BASE |kconfig| y |defconfig | self_protection | OK
CONFIG_VMAP_STACK |kconfig| y |defconfig | self_protection | OK
CONFIG_MICROCODE |kconfig| y |defconfig | self_protection | OK
CONFIG_RETPOLINE |kconfig| y |defconfig | self_protection | OK
-CONFIG_X86_SMAP |kconfig| y |defconfig | self_protection | OK
+CONFIG_X86_SMAP |kconfig| y |defconfig | self_protection | OK: version >= 5.19
CONFIG_SYN_COOKIES |kconfig| y |defconfig | self_protection | OK
-CONFIG_X86_UMIP |kconfig| y |defconfig | self_protection | OK: CONFIG_X86_INTEL_UMIP "y"
+CONFIG_X86_UMIP |kconfig| y |defconfig | self_protection | OK
CONFIG_PAGE_TABLE_ISOLATION |kconfig| y |defconfig | self_protection | OK
CONFIG_RANDOMIZE_MEMORY |kconfig| y |defconfig | self_protection | OK
CONFIG_INTEL_IOMMU |kconfig| y |defconfig | self_protection | OK
CONFIG_AMD_IOMMU |kconfig| y |defconfig | self_protection | OK
-CONFIG_SECURITY_DMESG_RESTRICT |kconfig| y | kspp | self_protection | FAIL: "is not set"
-CONFIG_BUG_ON_DATA_CORRUPTION |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_BUG_ON_DATA_CORRUPTION |kconfig| y | kspp | self_protection | OK
CONFIG_DEBUG_WX |kconfig| y | kspp | self_protection | OK
CONFIG_SCHED_STACK_END_CHECK |kconfig| y | kspp | self_protection | OK
CONFIG_SLAB_FREELIST_HARDENED |kconfig| y | kspp | self_protection | OK
CONFIG_SLAB_FREELIST_RANDOM |kconfig| y | kspp | self_protection | OK
CONFIG_SHUFFLE_PAGE_ALLOCATOR |kconfig| y | kspp | self_protection | OK
CONFIG_FORTIFY_SOURCE |kconfig| y | kspp | self_protection | OK
-CONFIG_DEBUG_LIST |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_DEBUG_LIST |kconfig| y | kspp | self_protection | OK
CONFIG_DEBUG_SG |kconfig| y | kspp | self_protection | FAIL: "is not set"
CONFIG_DEBUG_CREDENTIALS |kconfig| y | kspp | self_protection | FAIL: "is not set"
CONFIG_DEBUG_NOTIFIERS |kconfig| y | kspp | self_protection | FAIL: "is not set"
-CONFIG_INIT_ON_ALLOC_DEFAULT_ON |kconfig| y | kspp | self_protection | OK
-CONFIG_GCC_PLUGIN_LATENT_ENTROPY |kconfig| y | kspp | self_protection | FAIL: not found
-CONFIG_KFENCE |kconfig| y | kspp | self_protection | FAIL: not found
-CONFIG_WERROR |kconfig| y | kspp | self_protection | FAIL: not found
-CONFIG_IOMMU_DEFAULT_DMA_STRICT |kconfig| y | kspp | self_protection | FAIL: not found
-CONFIG_ZERO_CALL_USED_REGS |kconfig| y | kspp | self_protection | FAIL: not found
-CONFIG_GCC_PLUGIN_RANDSTRUCT |kconfig| y | kspp | self_protection | FAIL: not found
+CONFIG_INIT_ON_ALLOC_DEFAULT_ON |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_GCC_PLUGIN_LATENT_ENTROPY |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_KFENCE |kconfig| y | kspp | self_protection | OK
+CONFIG_WERROR |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_IOMMU_DEFAULT_DMA_STRICT |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_IOMMU_DEFAULT_PASSTHROUGH |kconfig| is not set | kspp | self_protection | OK
+CONFIG_ZERO_CALL_USED_REGS |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_RANDSTRUCT_FULL |kconfig| y | kspp | self_protection | FAIL: "is not set"
CONFIG_HARDENED_USERCOPY |kconfig| y | kspp | self_protection | OK
-CONFIG_HARDENED_USERCOPY_FALLBACK |kconfig| is not set | kspp | self_protection | FAIL: "y"
-CONFIG_HARDENED_USERCOPY_PAGESPAN |kconfig| is not set | kspp | self_protection | OK
+CONFIG_HARDENED_USERCOPY_FALLBACK |kconfig| is not set | kspp | self_protection | OK: not found
+CONFIG_HARDENED_USERCOPY_PAGESPAN |kconfig| is not set | kspp | self_protection | OK: not found
CONFIG_MODULE_SIG |kconfig| y | kspp | self_protection | OK
CONFIG_MODULE_SIG_ALL |kconfig| y | kspp | self_protection | OK
CONFIG_MODULE_SIG_SHA512 |kconfig| y | kspp | self_protection | OK
CONFIG_MODULE_SIG_FORCE |kconfig| y | kspp | self_protection | FAIL: "is not set"
-CONFIG_INIT_STACK_ALL_ZERO |kconfig| y | kspp | self_protection | FAIL: not found
-CONFIG_INIT_ON_FREE_DEFAULT_ON |kconfig| y | kspp | self_protection | OK: CONFIG_PAGE_POISONING_ZERO "y"
-CONFIG_GCC_PLUGIN_STACKLEAK |kconfig| y | kspp | self_protection | FAIL: not found
-CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT |kconfig| y | kspp | self_protection | FAIL: not found
-CONFIG_SCHED_CORE |kconfig| y | kspp | self_protection | FAIL: not found
+CONFIG_INIT_STACK_ALL_ZERO |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_INIT_ON_FREE_DEFAULT_ON |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_GCC_PLUGIN_STACKLEAK |kconfig| y | kspp | self_protection | FAIL: "is not set"
+CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT |kconfig| y | kspp | self_protection | OK
+CONFIG_SCHED_CORE |kconfig| y | kspp | self_protection | OK
CONFIG_DEFAULT_MMAP_MIN_ADDR |kconfig| 65536 | kspp | self_protection | OK
CONFIG_UBSAN_BOUNDS |kconfig| y |maintainer| self_protection | FAIL: not found
CONFIG_UBSAN_SANITIZE_ALL |kconfig| y |maintainer| self_protection | FAIL: CONFIG_UBSAN_BOUNDS not "y"
CONFIG_UBSAN_TRAP |kconfig| y |maintainer| self_protection | FAIL: CONFIG_UBSAN_BOUNDS not "y"
CONFIG_DEBUG_VIRTUAL |kconfig| y | clipos | self_protection | FAIL: "is not set"
CONFIG_STATIC_USERMODEHELPER |kconfig| y | clipos | self_protection | FAIL: "is not set"
-CONFIG_EFI_DISABLE_PCI_DMA |kconfig| y | clipos | self_protection | FAIL: not found
-CONFIG_SLAB_MERGE_DEFAULT |kconfig| is not set | clipos | self_protection | FAIL: "y"
+CONFIG_EFI_DISABLE_PCI_DMA |kconfig| y | clipos | self_protection | FAIL: "is not set"
+CONFIG_SLAB_MERGE_DEFAULT |kconfig| is not set | clipos | self_protection | OK
CONFIG_RANDOM_TRUST_BOOTLOADER |kconfig| is not set | clipos | self_protection | FAIL: "y"
CONFIG_RANDOM_TRUST_CPU |kconfig| is not set | clipos | self_protection | FAIL: "y"
-CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE|kconfig| is not set | clipos | self_protection | FAIL: CONFIG_GCC_PLUGIN_RANDSTRUCT not "y"
+CONFIG_RANDSTRUCT_PERFORMANCE |kconfig| is not set | clipos | self_protection | FAIL: CONFIG_RANDSTRUCT_FULL not "y"
CONFIG_STACKLEAK_METRICS |kconfig| is not set | clipos | self_protection | FAIL: CONFIG_GCC_PLUGIN_STACKLEAK not "y"
CONFIG_STACKLEAK_RUNTIME_DISABLE |kconfig| is not set | clipos | self_protection | FAIL: CONFIG_GCC_PLUGIN_STACKLEAK not "y"
CONFIG_INTEL_IOMMU_DEFAULT_ON |kconfig| y | clipos | self_protection | FAIL: "is not set"
CONFIG_INTEL_IOMMU_SVM |kconfig| y | clipos | self_protection | OK
-CONFIG_RESET_ATTACK_MITIGATION |kconfig| y | my | self_protection | OK
-CONFIG_SLS |kconfig| y | my | self_protection | FAIL: not found
+CONFIG_RESET_ATTACK_MITIGATION |kconfig| y | my | self_protection | FAIL: "is not set"
+CONFIG_UBSAN_LOCAL_BOUNDS |kconfig| y | my | self_protection | FAIL: not found
+CONFIG_SLS |kconfig| y | my | self_protection | OK
CONFIG_AMD_IOMMU_V2 |kconfig| y | my | self_protection | FAIL: "m"
CONFIG_SECURITY |kconfig| y |defconfig | security_policy | OK
CONFIG_SECURITY_YAMA |kconfig| y | kspp | security_policy | OK
+CONFIG_SECURITY_LANDLOCK |kconfig| y | kspp | security_policy | OK
CONFIG_SECURITY_SELINUX_DISABLE |kconfig| is not set | kspp | security_policy | OK
CONFIG_SECURITY_LOCKDOWN_LSM |kconfig| y | clipos | security_policy | OK
CONFIG_SECURITY_LOCKDOWN_LSM_EARLY |kconfig| y | clipos | security_policy | OK
CONFIG_LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY|kconfig| y | clipos | security_policy | FAIL: "is not set"
CONFIG_SECURITY_WRITABLE_HOOKS |kconfig| is not set | my | security_policy | OK: not found
-CONFIG_SECURITY_SAFESETID |kconfig| y | my | security_policy | OK
+CONFIG_SECURITY_SAFESETID |kconfig| y | my | security_policy | FAIL: "is not set"
CONFIG_SECURITY_LOADPIN |kconfig| y | my | security_policy | FAIL: "is not set"
CONFIG_SECURITY_LOADPIN_ENFORCE |kconfig| y | my | security_policy | FAIL: CONFIG_SECURITY_LOADPIN not "y"
-CONFIG_BPF_UNPRIV_DEFAULT_OFF |kconfig| y |defconfig |cut_attack_surface| FAIL: not found
+CONFIG_BPF_UNPRIV_DEFAULT_OFF |kconfig| y |defconfig |cut_attack_surface| OK
CONFIG_SECCOMP |kconfig| y |defconfig |cut_attack_surface| OK
CONFIG_SECCOMP_FILTER |kconfig| y |defconfig |cut_attack_surface| OK
CONFIG_STRICT_DEVMEM |kconfig| y |defconfig |cut_attack_surface| OK
+CONFIG_SECURITY_DMESG_RESTRICT |kconfig| y | kspp |cut_attack_surface| FAIL: "is not set"
CONFIG_ACPI_CUSTOM_METHOD |kconfig| is not set | kspp |cut_attack_surface| OK
CONFIG_COMPAT_BRK |kconfig| is not set | kspp |cut_attack_surface| OK
-CONFIG_DEVKMEM |kconfig| is not set | kspp |cut_attack_surface| OK
+CONFIG_DEVKMEM |kconfig| is not set | kspp |cut_attack_surface| OK: not found
CONFIG_COMPAT_VDSO |kconfig| is not set | kspp |cut_attack_surface| OK
CONFIG_BINFMT_MISC |kconfig| is not set | kspp |cut_attack_surface| FAIL: "m"
-CONFIG_INET_DIAG |kconfig| is not set | kspp |cut_attack_surface| FAIL: "m"
+CONFIG_INET_DIAG |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
CONFIG_KEXEC |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
CONFIG_PROC_KCORE |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
-CONFIG_LEGACY_PTYS |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
+CONFIG_LEGACY_PTYS |kconfig| is not set | kspp |cut_attack_surface| OK
CONFIG_HIBERNATION |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
CONFIG_IA32_EMULATION |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
-CONFIG_X86_X32 |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
+CONFIG_X86_X32 |kconfig| is not set | kspp |cut_attack_surface| OK: not found
CONFIG_MODIFY_LDT_SYSCALL |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
CONFIG_OABI_COMPAT |kconfig| is not set | kspp |cut_attack_surface| OK: not found
-CONFIG_X86_MSR |kconfig| is not set | kspp |cut_attack_surface| FAIL: "m"
+CONFIG_X86_MSR |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
CONFIG_MODULES |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
CONFIG_DEVMEM |kconfig| is not set | kspp |cut_attack_surface| FAIL: "y"
-CONFIG_IO_STRICT_DEVMEM |kconfig| y | kspp |cut_attack_surface| FAIL: "is not set"
+CONFIG_IO_STRICT_DEVMEM |kconfig| y | kspp |cut_attack_surface| OK
CONFIG_LEGACY_VSYSCALL_NONE |kconfig| y | kspp |cut_attack_surface| FAIL: "is not set"
CONFIG_ZSMALLOC_STAT |kconfig| is not set | grsec |cut_attack_surface| OK
-CONFIG_PAGE_OWNER |kconfig| is not set | grsec |cut_attack_surface| OK
+CONFIG_PAGE_OWNER |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_DEBUG_KMEMLEAK |kconfig| is not set | grsec |cut_attack_surface| OK
CONFIG_BINFMT_AOUT |kconfig| is not set | grsec |cut_attack_surface| OK: not found
CONFIG_KPROBE_EVENTS |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_BLK_DEV_IO_TRACE |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_PROC_VMCORE |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_PROC_PAGE_MONITOR |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
-CONFIG_USELIB |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
+CONFIG_USELIB |kconfig| is not set | grsec |cut_attack_surface| OK
CONFIG_CHECKPOINT_RESTORE |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_USERFAULTFD |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_HWPOISON_INJECT |kconfig| is not set | grsec |cut_attack_surface| FAIL: "m"
CONFIG_MEM_SOFT_DIRTY |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_DEVPORT |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_DEBUG_FS |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
-CONFIG_NOTIFIER_ERROR_INJECTION |kconfig| is not set | grsec |cut_attack_surface| FAIL: "m"
+CONFIG_NOTIFIER_ERROR_INJECTION |kconfig| is not set | grsec |cut_attack_surface| OK
CONFIG_FAIL_FUTEX |kconfig| is not set | grsec |cut_attack_surface| OK: not found
-CONFIG_PUNIT_ATOM_DEBUG |kconfig| is not set | grsec |cut_attack_surface| FAIL: "m"
-CONFIG_ACPI_CONFIGFS |kconfig| is not set | grsec |cut_attack_surface| FAIL: "m"
+CONFIG_PUNIT_ATOM_DEBUG |kconfig| is not set | grsec |cut_attack_surface| OK
+CONFIG_ACPI_CONFIGFS |kconfig| is not set | grsec |cut_attack_surface| OK
CONFIG_EDAC_DEBUG |kconfig| is not set | grsec |cut_attack_surface| OK
-CONFIG_DRM_I915_DEBUG |kconfig| is not set | grsec |cut_attack_surface| OK
+CONFIG_DRM_I915_DEBUG |kconfig| is not set | grsec |cut_attack_surface| OK: not found
CONFIG_BCACHE_CLOSURES_DEBUG |kconfig| is not set | grsec |cut_attack_surface| OK
CONFIG_DVB_C8SECTPFE |kconfig| is not set | grsec |cut_attack_surface| OK: not found
-CONFIG_MTD_SLRAM |kconfig| is not set | grsec |cut_attack_surface| FAIL: "m"
-CONFIG_MTD_PHRAM |kconfig| is not set | grsec |cut_attack_surface| FAIL: "m"
+CONFIG_MTD_SLRAM |kconfig| is not set | grsec |cut_attack_surface| OK
+CONFIG_MTD_PHRAM |kconfig| is not set | grsec |cut_attack_surface| OK
CONFIG_IO_URING |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
-CONFIG_KCMP |kconfig| is not set | grsec |cut_attack_surface| OK: not found
+CONFIG_KCMP |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_RSEQ |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
-CONFIG_LATENCYTOP |kconfig| is not set | grsec |cut_attack_surface| OK
+CONFIG_LATENCYTOP |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_KCOV |kconfig| is not set | grsec |cut_attack_surface| OK
-CONFIG_PROVIDE_OHCI1394_DMA_INIT |kconfig| is not set | grsec |cut_attack_surface| OK
+CONFIG_PROVIDE_OHCI1394_DMA_INIT |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
CONFIG_SUNRPC_DEBUG |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
-CONFIG_PTDUMP_DEBUGFS |kconfig| is not set | grsec |cut_attack_surface| OK: not found
+CONFIG_PTDUMP_DEBUGFS |kconfig| is not set | grsec |cut_attack_surface| OK
CONFIG_DRM_LEGACY |kconfig| is not set |maintainer|cut_attack_surface| OK
CONFIG_FB |kconfig| is not set |maintainer|cut_attack_surface| FAIL: "y"
CONFIG_VT |kconfig| is not set |maintainer|cut_attack_surface| FAIL: "y"
CONFIG_BLK_DEV_FD |kconfig| is not set |maintainer|cut_attack_surface| FAIL: "m"
-CONFIG_BLK_DEV_FD_RAWCMD |kconfig| is not set |maintainer|cut_attack_surface| OK: not found
+CONFIG_BLK_DEV_FD_RAWCMD |kconfig| is not set |maintainer|cut_attack_surface| OK
CONFIG_AIO |kconfig| is not set |grapheneos|cut_attack_surface| FAIL: "y"
CONFIG_STAGING |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
CONFIG_KSM |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
CONFIG_MAGIC_SYSRQ |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
CONFIG_KEXEC_FILE |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
CONFIG_USER_NS |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
-CONFIG_X86_CPUID |kconfig| is not set | clipos |cut_attack_surface| FAIL: "m"
-CONFIG_X86_IOPL_IOPERM |kconfig| is not set | clipos |cut_attack_surface| OK: not found
+CONFIG_X86_CPUID |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
+CONFIG_X86_IOPL_IOPERM |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
CONFIG_ACPI_TABLE_UPGRADE |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
-CONFIG_EFI_CUSTOM_SSDT_OVERLAYS |kconfig| is not set | clipos |cut_attack_surface| OK: not found
+CONFIG_EFI_CUSTOM_SSDT_OVERLAYS |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
CONFIG_LDISC_AUTOLOAD |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
CONFIG_X86_INTEL_TSX_MODE_OFF |kconfig| y | clipos |cut_attack_surface| OK
CONFIG_BPF_SYSCALL |kconfig| is not set | lockdown |cut_attack_surface| FAIL: "y"
CONFIG_TRIM_UNUSED_KSYMS |kconfig| y | my |cut_attack_surface| FAIL: not found
CONFIG_MMIOTRACE |kconfig| is not set | my |cut_attack_surface| FAIL: "y"
CONFIG_LIVEPATCH |kconfig| is not set | my |cut_attack_surface| FAIL: "y"
-CONFIG_IP_DCCP |kconfig| is not set | my |cut_attack_surface| FAIL: "m"
+CONFIG_IP_DCCP |kconfig| is not set | my |cut_attack_surface| OK
CONFIG_IP_SCTP |kconfig| is not set | my |cut_attack_surface| FAIL: "m"
CONFIG_FTRACE |kconfig| is not set | my |cut_attack_surface| FAIL: "y"
-CONFIG_VIDEO_VIVID |kconfig| is not set | my |cut_attack_surface| FAIL: "m"
-CONFIG_INPUT_EVBUG |kconfig| is not set | my |cut_attack_surface| FAIL: "m"
+CONFIG_VIDEO_VIVID |kconfig| is not set | my |cut_attack_surface| OK: not found
+CONFIG_INPUT_EVBUG |kconfig| is not set | my |cut_attack_surface| OK
+CONFIG_KGDB |kconfig| is not set | my |cut_attack_surface| FAIL: "y"
CONFIG_INTEGRITY |kconfig| y |defconfig | harden_userspace | OK
CONFIG_ARCH_MMAP_RND_BITS |kconfig| 32 | clipos | harden_userspace | FAIL: "28"
-
-[+] Config check is finished: 'OK' - 71 / 'FAIL' - 103
+nosmep |cmdline| is not set |defconfig | self_protection | OK: not found
+nosmap |cmdline| is not set |defconfig | self_protection | OK: not found
+nokaslr |cmdline| is not set |defconfig | self_protection | OK: not found
+nopti |cmdline| is not set |defconfig | self_protection | OK: not found
+nospectre_v1 |cmdline| is not set |defconfig | self_protection | OK: not found
+nospectre_v2 |cmdline| is not set |defconfig | self_protection | OK: not found
+rodata |cmdline| 1 |defconfig | self_protection | OK: rodata not found
+init_on_alloc |cmdline| 1 | kspp | self_protection | FAIL: not found
+init_on_free |cmdline| 1 | kspp | self_protection | FAIL: not found
+slab_nomerge |cmdline| | kspp | self_protection | OK: CONFIG_SLAB_MERGE_DEFAULT "is not set"
+iommu.strict |cmdline| 1 | kspp | self_protection | FAIL: not found
+iommu.passthrough |cmdline| 0 | kspp | self_protection | OK: CONFIG_IOMMU_DEFAULT_PASSTHROUGH "is not set"
+hardened_usercopy |cmdline| 1 | kspp | self_protection | OK: CONFIG_HARDENED_USERCOPY "y"
+slab_common.usercopy_fallback |cmdline| 0 | kspp | self_protection | OK: CONFIG_HARDENED_USERCOPY_FALLBACK not found
+randomize_kstack_offset |cmdline| 1 | kspp | self_protection | OK: CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT "y"
+pti |cmdline| on | kspp | self_protection | FAIL: not found
+page_alloc.shuffle |cmdline| 1 | clipos | self_protection | FAIL: not found
+spectre_v2 |cmdline| on | clipos | self_protection | FAIL: not found
+vsyscall |cmdline| none | kspp |cut_attack_surface| FAIL: not found
+debugfs |cmdline| off | grsec |cut_attack_surface| FAIL: not found
+
+[+] Config check is finished: 'OK' - 97 / 'FAIL' - 101
```
## kconfig-hardened-check versioning
-I usually update the kernel security hardening recommendations after each Linux kernel release.
+I usually update the kernel security hardening recommendations every few kernel releases.
So the version of `kconfig-hardened-check` is associated with the corresponding version of the kernel.
__Q:__ KSPP and CLIP OS recommend `CONFIG_PANIC_ON_OOPS=y`. Why doesn't this tool do the same?
-__A:__ I personally don't support this recommendation because it provides easy denial-of-service
-attacks for the whole system (kernel oops is not a rare situation). I think having `CONFIG_BUG` is enough here --
-if we have a kernel oops in the process context, the offending/attacking process is killed.
+__A:__ I personally don't support this recommendation because:
+ - It decreases system safety (kernel oops is still not a rare situation)
+ - It allows easier denial-of-service attacks for the whole system.
+
+I think having `CONFIG_BUG` is enough here.
+If a kernel oops happens in the process context, the offending/attacking process is killed.
+In other cases the kernel panics, which is similar to `CONFIG_PANIC_ON_OOPS=y`.
<br />
__Q:__ What about performance impact of these security hardening options?
__A:__ Ike Devolder [@BlackIkeEagle][7] made some performance tests and described the results in [this article][8].
+A more detailed evaluation is in the TODO list (the issue [#66][21]).
+
+<br />
+
+__Q:__ Can I easily check which kernel versions support some Kconfig option?
+
+__A:__ Yes, see the [LKDDb][18] project (Linux Kernel Driver Database) by Giacomo Catenazzi [@cateee][19].
+You can use it for the `mainline` or `stable` tree from [kernel.org][20] or for your custom kernel sources.
<br />
[15]: https://github.com/a13xp0p0v/kconfig-hardened-check/issues/53
[16]: https://github.com/a13xp0p0v/kconfig-hardened-check/pull/54
[17]: https://github.com/a13xp0p0v/kconfig-hardened-check/pull/62
+[18]: https://cateee.net/lkddb/web-lkddb/
+[19]: https://github.com/cateee/lkddb
+[20]: https://kernel.org/
+[21]: https://github.com/a13xp0p0v/kconfig-hardened-check/issues/66
+[22]: https://github.com/a13xp0p0v/kconfig-hardened-check/issues/56
+[23]: https://github.com/a13xp0p0v/kconfig-hardened-check/issues?q=label%3Akernel_maintainer_feedback
projects / kconfig-hardened-check.git / blobdiff