X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=README.md;h=b918ebba46c879d12f3afa9bfd2e63526ca6d5f5;hb=3630552c4a7cb10c3fb449b1f38d629744a3f91a;hp=35f3e18722747806610611c5ba59be0cb4e4d31f;hpb=9db42b7d967cd7b1b6476e23c0088221d187ebdd;p=kconfig-hardened-check.git diff --git a/README.md b/README.md index 35f3e18..b918ebb 100644 --- a/README.md +++ b/README.md @@ -10,10 +10,14 @@ But nobody likes checking configs manually. So let the computers do their job! __kconfig-hardened-check.py__ helps me to check the Linux kernel Kconfig option list against my hardening preferences, which are based on the -[KSPP recommended settings][1] and last public [grsecurity][2] patch (options -which they disable). -Please don't cry if my Python code looks like C. I'm just a kernel developer. + - [KSPP recommended settings][1], + - [CLIP OS kernel configuration][2], + - last public [grsecurity][3] patch (options which they disable). + +I also created [__Linux Kernel Defence Map__][4] that is a graphical representation of the +relationships between these hardening features and the corresponding vulnerability classes +or exploitation techniques. ## Supported microarchitectures @@ -26,8 +30,8 @@ Please don't cry if my Python code looks like C. I'm just a kernel developer. ### Usage ``` -#usage: kconfig-hardened-check.py [-h] [-p {X86_64,X86_32,ARM64,ARM}] - [-c CONFIG] [--debug] +usage: kconfig-hardened-check.py [-h] [-p {X86_64,X86_32,ARM64,ARM}] + [-c CONFIG] [--debug] [--json] Checks the hardening options in the Linux kernel config @@ -38,126 +42,157 @@ optional arguments: -c CONFIG, --config CONFIG check the config_file against these preferences --debug enable internal debug mode + --json print results in JSON format ``` -### Script output for `Ubuntu 18.04 (Bionic Beaver)` kernel config +### Script output for `Ubuntu 18.04 (Bionic Beaver with HWE)` kernel config ``` -#./kconfig-hardened-check.py -c config_files/distros/ubuntu-bionic-generic.config +$ ./kconfig-hardened-check.py -c config_files/distros/ubuntu-bionic-generic.config [+] Trying to detect architecture in "config_files/distros/ubuntu-bionic-generic.config"... [+] Detected architecture: X86_64 [+] Checking "config_files/distros/ubuntu-bionic-generic.config" against hardening preferences... - option name | desired val | decision | reason || check result -==================================================================================================================== -CONFIG_BUG | y |defconfig | self_protection || OK -CONFIG_STRICT_KERNEL_RWX | y |defconfig | self_protection || OK -CONFIG_STACKPROTECTOR_STRONG | y |defconfig | self_protection ||OK: CONFIG_CC_STACKPROTECTOR_STRONG "y" -CONFIG_SLUB_DEBUG | y |defconfig | self_protection || OK -CONFIG_STRICT_MODULE_RWX | y |defconfig | self_protection || OK -CONFIG_PAGE_TABLE_ISOLATION | y |defconfig | self_protection || OK -CONFIG_RANDOMIZE_MEMORY | y |defconfig | self_protection || OK -CONFIG_RANDOMIZE_BASE | y |defconfig | self_protection || OK -CONFIG_RETPOLINE | y |defconfig | self_protection || OK -CONFIG_X86_SMAP | y |defconfig | self_protection || OK -CONFIG_X86_INTEL_UMIP | y |defconfig | self_protection || OK -CONFIG_SYN_COOKIES | y |defconfig | self_protection || OK -CONFIG_VMAP_STACK | y |defconfig | self_protection || OK -CONFIG_THREAD_INFO_IN_TASK | y |defconfig | self_protection || OK -CONFIG_BUG_ON_DATA_CORRUPTION | y | kspp | self_protection || FAIL: "is not set" -CONFIG_DEBUG_WX | y | kspp | self_protection || OK -CONFIG_SCHED_STACK_END_CHECK | y | kspp | self_protection || OK -CONFIG_SLAB_FREELIST_HARDENED | y | kspp | self_protection || OK -CONFIG_SLAB_FREELIST_RANDOM | y | kspp | self_protection || OK -CONFIG_FORTIFY_SOURCE | y | kspp | self_protection || OK -CONFIG_GCC_PLUGINS | y | kspp | self_protection || FAIL: "is not set" -CONFIG_GCC_PLUGIN_RANDSTRUCT | y | kspp | self_protection || FAIL: not found -CONFIG_GCC_PLUGIN_STRUCTLEAK | y | kspp | self_protection || FAIL: not found -CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL | y | kspp | self_protection || FAIL: not found -CONFIG_GCC_PLUGIN_LATENT_ENTROPY | y | kspp | self_protection || FAIL: not found -CONFIG_DEBUG_LIST | y | kspp | self_protection || FAIL: "is not set" -CONFIG_DEBUG_SG | y | kspp | self_protection || FAIL: "is not set" -CONFIG_DEBUG_CREDENTIALS | y | kspp | self_protection || FAIL: "is not set" -CONFIG_DEBUG_NOTIFIERS | y | kspp | self_protection || FAIL: "is not set" -CONFIG_PAGE_POISONING | y | kspp | self_protection || FAIL: "is not set" -CONFIG_HARDENED_USERCOPY | y | kspp | self_protection || OK -CONFIG_HARDENED_USERCOPY_FALLBACK | is not set | kspp | self_protection || OK: not found -CONFIG_MODULE_SIG | y | kspp | self_protection || OK -CONFIG_MODULE_SIG_ALL | y | kspp | self_protection || OK -CONFIG_MODULE_SIG_SHA512 | y | kspp | self_protection || OK -CONFIG_MODULE_SIG_FORCE | y | kspp | self_protection || FAIL: "is not set" -CONFIG_DEFAULT_MMAP_MIN_ADDR | 65536 | kspp | self_protection || OK -CONFIG_REFCOUNT_FULL | y | kspp | self_protection || FAIL: "is not set" -CONFIG_GCC_PLUGIN_STACKLEAK | y | my | self_protection || FAIL: not found -CONFIG_LOCK_DOWN_KERNEL | y | my | self_protection || OK -CONFIG_SLUB_DEBUG_ON | y | my | self_protection || FAIL: "is not set" -CONFIG_SECURITY_DMESG_RESTRICT | y | my | self_protection || FAIL: "is not set" -CONFIG_STATIC_USERMODEHELPER | y | my | self_protection || FAIL: "is not set" -CONFIG_SECURITY_LOADPIN | y | my | self_protection || FAIL: "is not set" -CONFIG_RESET_ATTACK_MITIGATION | y | my | self_protection || OK -CONFIG_SLAB_MERGE_DEFAULT | is not set | my | self_protection || FAIL: "y" -CONFIG_PAGE_POISONING_NO_SANITY | is not set | my | self_protection ||FAIL: CONFIG_PAGE_POISONING is needed -CONFIG_PAGE_POISONING_ZERO | is not set | my | self_protection ||FAIL: CONFIG_PAGE_POISONING is needed -CONFIG_SECURITY | y |defconfig | security_policy || OK -CONFIG_SECURITY_YAMA | y | kspp | security_policy || OK -CONFIG_SECURITY_SELINUX_DISABLE | is not set | kspp | security_policy || OK -CONFIG_SECCOMP | y |defconfig | cut_attack_surface || OK -CONFIG_SECCOMP_FILTER | y |defconfig | cut_attack_surface || OK -CONFIG_STRICT_DEVMEM | y |defconfig | cut_attack_surface || OK -CONFIG_MODULES | is not set | kspp | cut_attack_surface || FAIL: "y" -CONFIG_DEVMEM | is not set | kspp | cut_attack_surface || FAIL: "y" -CONFIG_IO_STRICT_DEVMEM | y | kspp | cut_attack_surface || FAIL: "is not set" -CONFIG_ACPI_CUSTOM_METHOD | is not set | kspp | cut_attack_surface || OK -CONFIG_COMPAT_BRK | is not set | kspp | cut_attack_surface || OK -CONFIG_DEVKMEM | is not set | kspp | cut_attack_surface || OK -CONFIG_COMPAT_VDSO | is not set | kspp | cut_attack_surface || OK -CONFIG_BINFMT_MISC | is not set | kspp | cut_attack_surface || FAIL: "m" -CONFIG_INET_DIAG | is not set | kspp | cut_attack_surface || FAIL: "m" -CONFIG_KEXEC | is not set | kspp | cut_attack_surface || FAIL: "y" -CONFIG_PROC_KCORE | is not set | kspp | cut_attack_surface || FAIL: "y" -CONFIG_LEGACY_PTYS | is not set | kspp | cut_attack_surface || FAIL: "y" -CONFIG_HIBERNATION | is not set | kspp | cut_attack_surface || FAIL: "y" -CONFIG_LEGACY_VSYSCALL_NONE | y | kspp | cut_attack_surface || FAIL: "is not set" -CONFIG_IA32_EMULATION | is not set | kspp | cut_attack_surface || FAIL: "y" -CONFIG_X86_X32 | is not set | kspp | cut_attack_surface || FAIL: "y" -CONFIG_MODIFY_LDT_SYSCALL | is not set | kspp | cut_attack_surface || FAIL: "y" -CONFIG_X86_PTDUMP | is not set |grsecurity| cut_attack_surface || OK -CONFIG_ZSMALLOC_STAT | is not set |grsecurity| cut_attack_surface || OK -CONFIG_PAGE_OWNER | is not set |grsecurity| cut_attack_surface || OK -CONFIG_DEBUG_KMEMLEAK | is not set |grsecurity| cut_attack_surface || OK -CONFIG_BINFMT_AOUT | is not set |grsecurity| cut_attack_surface || OK: not found -CONFIG_KPROBES | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_UPROBES | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_GENERIC_TRACER | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_PROC_VMCORE | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_PROC_PAGE_MONITOR | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_USELIB | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_CHECKPOINT_RESTORE | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_USERFAULTFD | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_HWPOISON_INJECT | is not set |grsecurity| cut_attack_surface || FAIL: "m" -CONFIG_MEM_SOFT_DIRTY | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_DEVPORT | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_DEBUG_FS | is not set |grsecurity| cut_attack_surface || FAIL: "y" -CONFIG_NOTIFIER_ERROR_INJECTION | is not set |grsecurity| cut_attack_surface || FAIL: "m" -CONFIG_ACPI_TABLE_UPGRADE | is not set | lockdown | cut_attack_surface || FAIL: "y" -CONFIG_ACPI_APEI_EINJ | is not set | lockdown | cut_attack_surface || FAIL: "m" -CONFIG_PROFILING | is not set | lockdown | cut_attack_surface || FAIL: "y" -CONFIG_BPF_SYSCALL | is not set | lockdown | cut_attack_surface || FAIL: "y" -CONFIG_MMIOTRACE_TEST | is not set | lockdown | cut_attack_surface || OK -CONFIG_MMIOTRACE | is not set | my | cut_attack_surface || FAIL: "y" -CONFIG_KEXEC_FILE | is not set | my | cut_attack_surface || FAIL: "y" -CONFIG_LIVEPATCH | is not set | my | cut_attack_surface || FAIL: "y" -CONFIG_USER_NS | is not set | my | cut_attack_surface || FAIL: "y" -CONFIG_IP_DCCP | is not set | my | cut_attack_surface || FAIL: "m" -CONFIG_IP_SCTP | is not set | my | cut_attack_surface || FAIL: "m" -CONFIG_FTRACE | is not set | my | cut_attack_surface || FAIL: "y" -CONFIG_BPF_JIT | is not set | my | cut_attack_surface || FAIL: "y" -CONFIG_ARCH_MMAP_RND_BITS | 32 | my |userspace_protection|| FAIL: "28" - -[+] config check is finished: 'OK' - 43 / 'FAIL' - 60 + option name | desired val | decision | reason | check result +========================================================================================================================= +CONFIG_BUG | y |defconfig | self_protection | OK +CONFIG_STRICT_KERNEL_RWX | y |defconfig | self_protection | OK +CONFIG_STACKPROTECTOR_STRONG | y |defconfig | self_protection | OK +CONFIG_SLUB_DEBUG | y |defconfig | self_protection | OK +CONFIG_STRICT_MODULE_RWX | y |defconfig | self_protection | OK +CONFIG_MICROCODE | y |defconfig | self_protection | OK +CONFIG_RETPOLINE | y |defconfig | self_protection | OK +CONFIG_X86_SMAP | y |defconfig | self_protection | OK +CONFIG_X86_UMIP | y |defconfig | self_protection | OK: CONFIG_X86_INTEL_UMIP "y" +CONFIG_IOMMU_SUPPORT | y |defconfig | self_protection | OK +CONFIG_SYN_COOKIES | y |defconfig | self_protection | OK +CONFIG_PAGE_TABLE_ISOLATION | y |defconfig | self_protection | OK +CONFIG_RANDOMIZE_MEMORY | y |defconfig | self_protection | OK +CONFIG_INTEL_IOMMU | y |defconfig | self_protection | OK +CONFIG_AMD_IOMMU | y |defconfig | self_protection | OK +CONFIG_VMAP_STACK | y |defconfig | self_protection | OK +CONFIG_RANDOMIZE_BASE | y |defconfig | self_protection | OK +CONFIG_THREAD_INFO_IN_TASK | y |defconfig | self_protection | OK +CONFIG_BUG_ON_DATA_CORRUPTION | y | kspp | self_protection | FAIL: "is not set" +CONFIG_DEBUG_WX | y | kspp | self_protection | OK +CONFIG_SCHED_STACK_END_CHECK | y | kspp | self_protection | OK +CONFIG_SLAB_FREELIST_HARDENED | y | kspp | self_protection | OK +CONFIG_SLAB_FREELIST_RANDOM | y | kspp | self_protection | OK +CONFIG_SHUFFLE_PAGE_ALLOCATOR | y | kspp | self_protection | OK +CONFIG_FORTIFY_SOURCE | y | kspp | self_protection | OK +CONFIG_GCC_PLUGINS | y | kspp | self_protection | FAIL: not found +CONFIG_GCC_PLUGIN_RANDSTRUCT | y | kspp | self_protection | FAIL: not found +CONFIG_GCC_PLUGIN_LATENT_ENTROPY | y | kspp | self_protection | FAIL: not found +CONFIG_DEBUG_LIST | y | kspp | self_protection | FAIL: "is not set" +CONFIG_DEBUG_SG | y | kspp | self_protection | FAIL: "is not set" +CONFIG_DEBUG_CREDENTIALS | y | kspp | self_protection | FAIL: "is not set" +CONFIG_DEBUG_NOTIFIERS | y | kspp | self_protection | FAIL: "is not set" +CONFIG_HARDENED_USERCOPY | y | kspp | self_protection | OK +CONFIG_HARDENED_USERCOPY_FALLBACK | is not set | kspp | self_protection | FAIL: "y" +CONFIG_MODULE_SIG | y | kspp | self_protection | OK +CONFIG_MODULE_SIG_ALL | y | kspp | self_protection | OK +CONFIG_MODULE_SIG_SHA512 | y | kspp | self_protection | OK +CONFIG_MODULE_SIG_FORCE | y | kspp | self_protection | FAIL: "is not set" +CONFIG_DEFAULT_MMAP_MIN_ADDR | 65536 | kspp | self_protection | OK +CONFIG_REFCOUNT_FULL | y | kspp | self_protection | FAIL: "is not set" +CONFIG_INIT_STACK_ALL | y | clipos | self_protection | FAIL: not found +CONFIG_INIT_ON_ALLOC_DEFAULT_ON | y | clipos | self_protection | OK +CONFIG_INIT_ON_FREE_DEFAULT_ON | y | clipos | self_protection | OK: CONFIG_PAGE_POISONING "y" +CONFIG_SECURITY_DMESG_RESTRICT | y | clipos | self_protection | FAIL: "is not set" +CONFIG_DEBUG_VIRTUAL | y | clipos | self_protection | FAIL: "is not set" +CONFIG_STATIC_USERMODEHELPER | y | clipos | self_protection | FAIL: "is not set" +CONFIG_SLAB_MERGE_DEFAULT | is not set | clipos | self_protection | FAIL: "y" +CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE | is not set | clipos | self_protection | FAIL: CONFIG_GCC_PLUGIN_RANDSTRUCT is needed +CONFIG_GCC_PLUGIN_STACKLEAK | y | clipos | self_protection | FAIL: not found +CONFIG_STACKLEAK_METRICS | is not set | clipos | self_protection | FAIL: CONFIG_GCC_PLUGIN_STACKLEAK is needed +CONFIG_STACKLEAK_RUNTIME_DISABLE | is not set | clipos | self_protection | FAIL: CONFIG_GCC_PLUGIN_STACKLEAK is needed +CONFIG_RANDOM_TRUST_CPU | is not set | clipos | self_protection | FAIL: "y" +CONFIG_INTEL_IOMMU_SVM | y | clipos | self_protection | OK +CONFIG_INTEL_IOMMU_DEFAULT_ON | y | clipos | self_protection | FAIL: "is not set" +CONFIG_SLUB_DEBUG_ON | y | my | self_protection | FAIL: "is not set" +CONFIG_RESET_ATTACK_MITIGATION | y | my | self_protection | OK +CONFIG_AMD_IOMMU_V2 | y | my | self_protection | FAIL: "m" +CONFIG_SECURITY | y |defconfig | security_policy | OK +CONFIG_SECURITY_WRITABLE_HOOKS | is not set |defconfig | security_policy | OK: not found +CONFIG_SECURITY_YAMA | y | kspp | security_policy | OK +CONFIG_SECURITY_LOADPIN | y | my | security_policy | FAIL: "is not set" +CONFIG_SECURITY_LOCKDOWN_LSM | y | my | security_policy | FAIL: not found +CONFIG_SECURITY_LOCKDOWN_LSM_EARLY | y | my | security_policy | FAIL: not found +CONFIG_LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY| y | my | security_policy | FAIL: not found +CONFIG_SECURITY_SAFESETID | y | my | security_policy | OK +CONFIG_SECCOMP | y |defconfig | cut_attack_surface | OK +CONFIG_SECCOMP_FILTER | y |defconfig | cut_attack_surface | OK +CONFIG_STRICT_DEVMEM | y |defconfig | cut_attack_surface | OK +CONFIG_MODULES | is not set | kspp | cut_attack_surface | FAIL: "y" +CONFIG_DEVMEM | is not set | kspp | cut_attack_surface | FAIL: "y" +CONFIG_IO_STRICT_DEVMEM | y | kspp | cut_attack_surface | FAIL: "is not set" +CONFIG_ACPI_CUSTOM_METHOD | is not set | kspp | cut_attack_surface | OK +CONFIG_COMPAT_BRK | is not set | kspp | cut_attack_surface | OK +CONFIG_DEVKMEM | is not set | kspp | cut_attack_surface | OK +CONFIG_COMPAT_VDSO | is not set | kspp | cut_attack_surface | OK +CONFIG_BINFMT_MISC | is not set | kspp | cut_attack_surface | FAIL: "m" +CONFIG_INET_DIAG | is not set | kspp | cut_attack_surface | FAIL: "m" +CONFIG_KEXEC | is not set | kspp | cut_attack_surface | FAIL: "y" +CONFIG_PROC_KCORE | is not set | kspp | cut_attack_surface | FAIL: "y" +CONFIG_LEGACY_PTYS | is not set | kspp | cut_attack_surface | FAIL: "y" +CONFIG_HIBERNATION | is not set | kspp | cut_attack_surface | FAIL: "y" +CONFIG_LEGACY_VSYSCALL_NONE | y | kspp | cut_attack_surface | FAIL: "is not set" +CONFIG_IA32_EMULATION | is not set | kspp | cut_attack_surface | FAIL: "y" +CONFIG_X86_X32 | is not set | kspp | cut_attack_surface | FAIL: "y" +CONFIG_MODIFY_LDT_SYSCALL | is not set | kspp | cut_attack_surface | FAIL: "y" +CONFIG_X86_PTDUMP | is not set |grsecurity| cut_attack_surface | OK +CONFIG_ZSMALLOC_STAT | is not set |grsecurity| cut_attack_surface | OK +CONFIG_PAGE_OWNER | is not set |grsecurity| cut_attack_surface | OK +CONFIG_DEBUG_KMEMLEAK | is not set |grsecurity| cut_attack_surface | OK +CONFIG_BINFMT_AOUT | is not set |grsecurity| cut_attack_surface | OK: not found +CONFIG_KPROBES | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_UPROBES | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_GENERIC_TRACER | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_PROC_VMCORE | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_PROC_PAGE_MONITOR | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_USELIB | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_CHECKPOINT_RESTORE | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_USERFAULTFD | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_HWPOISON_INJECT | is not set |grsecurity| cut_attack_surface | FAIL: "m" +CONFIG_MEM_SOFT_DIRTY | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_DEVPORT | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_DEBUG_FS | is not set |grsecurity| cut_attack_surface | FAIL: "y" +CONFIG_NOTIFIER_ERROR_INJECTION | is not set |grsecurity| cut_attack_surface | FAIL: "m" +CONFIG_ACPI_TABLE_UPGRADE | is not set | lockdown | cut_attack_surface | FAIL: "y" +CONFIG_ACPI_APEI_EINJ | is not set | lockdown | cut_attack_surface | FAIL: "m" +CONFIG_PROFILING | is not set | lockdown | cut_attack_surface | FAIL: "y" +CONFIG_BPF_SYSCALL | is not set | lockdown | cut_attack_surface | FAIL: "y" +CONFIG_MMIOTRACE_TEST | is not set | lockdown | cut_attack_surface | OK +CONFIG_KSM | is not set | clipos | cut_attack_surface | FAIL: "y" +CONFIG_KALLSYMS | is not set | clipos | cut_attack_surface | FAIL: "y" +CONFIG_X86_VSYSCALL_EMULATION | is not set | clipos | cut_attack_surface | FAIL: "y" +CONFIG_MAGIC_SYSRQ | is not set | clipos | cut_attack_surface | FAIL: "y" +CONFIG_KEXEC_FILE | is not set | clipos | cut_attack_surface | FAIL: "y" +CONFIG_USER_NS | is not set | clipos | cut_attack_surface | FAIL: "y" +CONFIG_LDISC_AUTOLOAD | is not set | clipos | cut_attack_surface | FAIL: "y" +CONFIG_MMIOTRACE | is not set | my | cut_attack_surface | FAIL: "y" +CONFIG_LIVEPATCH | is not set | my | cut_attack_surface | FAIL: "y" +CONFIG_IP_DCCP | is not set | my | cut_attack_surface | FAIL: "m" +CONFIG_IP_SCTP | is not set | my | cut_attack_surface | FAIL: "m" +CONFIG_FTRACE | is not set | my | cut_attack_surface | FAIL: "y" +CONFIG_BPF_JIT | is not set | my | cut_attack_surface | FAIL: "y" +CONFIG_VIDEO_VIVID | is not set | my | cut_attack_surface | FAIL: "m" +CONFIG_ARCH_MMAP_RND_BITS | 32 | clipos |userspace_hardening | FAIL: "28" + +[+] config check is finished: 'OK' - 50 / 'FAIL' - 73 ``` +## kconfig-hardened-check versioning + +I usually update the kernel hardening recommendations after each Linux kernel release. + +So the version of `kconfig-hardened-check` is associated with the corresponding version of the kernel. + +The version format is: __[major_number].[kernel_version]__ + +The current version of `kconfig-hardened-check` is __0.5.3__, it's marked with the git tag. -### Questions and answers + +## Questions and answers __Q:__ How disabling `CONFIG_USER_NS` cuts the attack surface? It's needed for containers! @@ -177,6 +212,15 @@ __Q:__ Why `CONFIG_GCC_PLUGINS` is automatically disabled during the kernel comp __A:__ It means that your gcc doesn't support plugins. For example, if you have `gcc-7` on Ubuntu, try to install `gcc-7-plugin-dev` package, it should help. +
+ +__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. [1]: http://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project/Recommended_Settings -[2]: https://grsecurity.net/ +[2]: https://docs.clip-os.org/clipos/kernel.html#configuration +[3]: https://grsecurity.net/ +[4]: https://github.com/a13xp0p0v/linux-kernel-defence-map