-# Kconfig hardened check
+# kconfig-hardened-check
+
+
+
+[](https://codecov.io/gh/a13xp0p0v/kconfig-hardened-check)
## Motivation
-There are plenty of Linux kernel hardening config options. A lot of them are
+There are plenty of security hardening options for the Linux kernel. A lot of them are
not enabled by the major distros. We have to enable these options ourselves to
make our systems more secure.
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
+__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).
+ - Last public [grsecurity][3] patch (options which they disable),
+ - [SECURITY_LOCKDOWN_LSM][5] patchset,
+ - [Direct feedback from the Linux kernel maintainers][23].
+
+This tool supports checking __Kconfig__ options and __kernel cmdline__ parameters.
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
+relationships between security hardening features and the corresponding vulnerability classes
or exploitation techniques.
## Supported microarchitectures
- ARM64
- ARM
-## Script output examples
+TODO: RISC-V (the issue [#56][22])
+
+## Installation
+
+You can install the package:
+
+```
+pip install git+https://github.com/a13xp0p0v/kconfig-hardened-check
+```
+
+or simply run `./bin/kconfig-hardened-check` from the cloned repository.
+
+Some Linux distributions also provide `kconfig-hardened-check` as a package.
-### Usage
+## Usage
```
-usage: kconfig-hardened-check.py [-h] [-p {X86_64,X86_32,ARM64,ARM}]
- [-c CONFIG] [--debug] [--json]
+usage: kconfig-hardened-check [-h] [--version] [-p {X86_64,X86_32,ARM64,ARM}]
+ [-c CONFIG]
+ [-l CMDLINE]
+ [-m {verbose,json,show_ok,show_fail}]
-Checks the hardening options in the Linux kernel config
+A tool for checking the security hardening options of the Linux kernel
optional arguments:
-h, --help show this help message and exit
+ --version show program's version number and exit
-p {X86_64,X86_32,ARM64,ARM}, --print {X86_64,X86_32,ARM64,ARM}
- print hardening preferences for selected architecture
+ print security hardening preferences for the selected architecture
-c CONFIG, --config CONFIG
- check the config_file against these preferences
- --debug enable internal debug mode
- --json print results in JSON format
+ check the kernel kconfig file against these preferences
+ -l CMDLINE, --cmdline CMDLINE
+ check the kernel cmdline file against these preferences
+ -m {verbose,json,show_ok,show_fail}, --mode {verbose,json,show_ok,show_fail}
+ choose the report mode
+```
+
+## Output modes
+ - no `-m` argument for the default output mode (see the example below)
+ - `-m verbose` for printing additional info:
+ - config options without a corresponding check
+ - internals of complex checks with AND/OR, like this:
+```
+-------------------------------------------------------------------------------------------
+ <<< OR >>>
+CONFIG_STRICT_DEVMEM | y |defconfig | cut_attack_surface
+CONFIG_DEVMEM | is not set | kspp | cut_attack_surface
+-------------------------------------------------------------------------------------------
```
+ - `-m show_fail` for showing only the failed checks
+ - `-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)
-### Script output for `Ubuntu 18.04 (Bionic Beaver)` kernel config
+## Example output for `Fedora 34` kernel configuration
```
-#./kconfig-hardened-check.py -c config_files/distros/ubuntu-bionic-generic.config
-[+] Trying to detect architecture in "config_files/distros/ubuntu-bionic-generic.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
-[+] Checking "config_files/distros/ubuntu-bionic-generic.config" against hardening preferences...
- option name | desired val | decision | reason || check result
+[+] Detected kernel version: 5.19
+[+] Detected compiler: GCC 120201
=========================================================================================================================
-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_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 || FAIL: not found
-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_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_INIT_STACK_ALL | y | clipos | self_protection || FAIL: not found
-CONFIG_INIT_ON_ALLOC_DEFAULT_ON | y | clipos | self_protection || FAIL: not found
-CONFIG_INIT_ON_FREE_DEFAULT_ON | y | clipos | self_protection || FAIL: not found
-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 || OK: not found
-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_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_AMD_IOMMU_V2 | y | my | self_protection || FAIL: "m"
-CONFIG_SECURITY | y |defconfig | security_policy || OK
-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_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 || OK: not found
-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_ARCH_MMAP_RND_BITS | 32 | clipos |userspace_protection|| FAIL: "28"
-
-[+] config check is finished: 'OK' - 48 / 'FAIL' - 75
+ 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 | OK
+CONFIG_STACKPROTECTOR |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 | 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: version >= 5.19
+CONFIG_SYN_COOKIES |kconfig| y |defconfig | self_protection | OK
+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_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 | 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 | 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 | 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: "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: "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_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 | 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 | 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| 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: 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: "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| 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| 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: "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| 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| 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_UPROBE_EVENTS |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
+CONFIG_GENERIC_TRACER |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
+CONFIG_FUNCTION_TRACER |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
+CONFIG_STACK_TRACER |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
+CONFIG_HIST_TRIGGERS |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| 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| 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| 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: 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| 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| FAIL: "y"
+CONFIG_RSEQ |kconfig| is not set | grsec |cut_attack_surface| FAIL: "y"
+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| 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
+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
+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_KALLSYMS |kconfig| is not set | clipos |cut_attack_surface| FAIL: "y"
+CONFIG_X86_VSYSCALL_EMULATION |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: "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| 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_EFI_TEST |kconfig| is not set | lockdown |cut_attack_surface| FAIL: "m"
+CONFIG_MMIOTRACE_TEST |kconfig| is not set | lockdown |cut_attack_surface| OK
+CONFIG_KPROBES |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| 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| 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"
+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 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.
-The version format is: __[major_number].[kernel_version]__
-
-The current version of `kconfig-hardened-check` is __0.5.2__, it's marked with the git tag.
+The version format is: __[major_number].[kernel_version].[kernel_patchlevel]__
## Questions and answers
__Q:__ How disabling `CONFIG_USER_NS` cuts the attack surface? It's needed for containers!
__A:__ Yes, the `CONFIG_USER_NS` option provides some isolation between the userspace programs,
-but the script recommends disabling it to cut the attack surface __of the kernel__.
+but the tool recommends disabling it to cut the attack surface __of the kernel__.
The rationale:
- A twitter thread about `CONFIG_USER_NS` and security: https://twitter.com/robertswiecki/status/1095447678949953541
+ - A good overview of the trade-off between having user namespaces enabled, disabled and available only for root: https://github.com/NixOS/nixpkgs/pull/84522#issuecomment-614640601
+
<br />
__Q:__ Why `CONFIG_GCC_PLUGINS` is automatically disabled during the kernel compilation?
__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.
+<br />
+
+__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 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 />
+
+__Q:__ Why enabling `CONFIG_STATIC_USERMODEHELPER` breaks various things in my GNU/Linux system?
+Do I really need that feature?
+
+__A:__ Linux kernel usermode helpers can be used for privilege escalation in kernel exploits
+([example 1][9], [example 2][10]). `CONFIG_STATIC_USERMODEHELPER` prevents that method. But it
+requires the corresponding support in the userspace: see the [example implementation][11] by
+Tycho Andersen [@tych0][12].
+
+<br />
+
+__Q:__ Does my kernel have all those mitigations of Transient Execution Vulnerabilities in my hardware?
+
+__A:__ Checking the kernel config is not enough to answer this question.
+I highly recommend using [spectre-meltdown-checker][13] tool maintained by Stéphane Lesimple [@speed47][14].
+
[1]: http://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project/Recommended_Settings
[2]: https://docs.clip-os.org/clipos/kernel.html#configuration
[3]: https://grsecurity.net/
[4]: https://github.com/a13xp0p0v/linux-kernel-defence-map
+[5]: https://lwn.net/Articles/791863/
+[6]: https://github.com/a13xp0p0v/kconfig-hardened-check/issues/38
+[7]: https://github.com/BlackIkeEagle
+[8]: https://blog.herecura.eu/blog/2020-05-30-kconfig-hardening-tests/
+[9]: https://googleprojectzero.blogspot.com/2018/09/a-cache-invalidation-bug-in-linux.html
+[10]: https://a13xp0p0v.github.io/2020/02/15/CVE-2019-18683.html
+[11]: https://github.com/tych0/huldufolk
+[12]: https://github.com/tych0
+[13]: https://github.com/speed47/spectre-meltdown-checker
+[14]: https://github.com/speed47
+[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