1 # Kconfig hardened check
5 There are plenty of Linux kernel hardening config options. A lot of them are
6 not enabled by the major distros. We have to enable these options ourselves to
7 make our systems more secure.
9 But nobody likes checking configs manually. So let the computers do their job!
11 __kconfig-hardened-check.py__ helps me to check the Linux kernel Kconfig option list
12 against my hardening preferences for `x86_64`, which are based on the
13 [KSPP recommended settings][1]
15 Please don't cry if my Python code looks like C. I'm just a kernel developer.
17 ## Script output examples
21 #./kconfig-hardened-check.py
22 Usage: ./kconfig-hardened-check.py [-p | -c <config_file>]
24 print hardening preferences
25 -c <config_file>, --config=<config_file>
26 check the config_file against these preferences
29 ### Script output for `Ubuntu 18.04 (Bionic Beaver)` kernel config
31 ./kconfig-hardened-check.py -c ubuntu-bionic-generic.config
32 [+] Checking "ubuntu-bionic-generic.config" against hardening preferences...
33 option name | desired val | decision | reason || check result
34 ===========================================================================================================
35 CONFIG_BUG | y | ubuntu18 | self_protection || OK
36 CONFIG_PAGE_TABLE_ISOLATION | y | ubuntu18 | self_protection || OK
37 CONFIG_RETPOLINE | y | ubuntu18 | self_protection || OK
38 CONFIG_X86_64 | y | ubuntu18 | self_protection || OK
39 CONFIG_STRICT_KERNEL_RWX | y | ubuntu18 | self_protection || OK
40 CONFIG_STRICT_MODULE_RWX | y | ubuntu18 | self_protection || OK
41 CONFIG_DEBUG_WX | y | ubuntu18 | self_protection || OK
42 CONFIG_RANDOMIZE_BASE | y | ubuntu18 | self_protection || OK
43 CONFIG_RANDOMIZE_MEMORY | y | ubuntu18 | self_protection || OK
44 CONFIG_CC_STACKPROTECTOR | y | ubuntu18 | self_protection || OK
45 CONFIG_CC_STACKPROTECTOR_STRONG | y | ubuntu18 | self_protection || OK
46 CONFIG_VMAP_STACK | y | ubuntu18 | self_protection || OK
47 CONFIG_THREAD_INFO_IN_TASK | y | ubuntu18 | self_protection || OK
48 CONFIG_SCHED_STACK_END_CHECK | y | ubuntu18 | self_protection || OK
49 CONFIG_SLUB_DEBUG | y | ubuntu18 | self_protection || OK
50 CONFIG_SLAB_FREELIST_HARDENED | y | ubuntu18 | self_protection || OK
51 CONFIG_SLAB_FREELIST_RANDOM | y | ubuntu18 | self_protection || OK
52 CONFIG_HARDENED_USERCOPY | y | ubuntu18 | self_protection || OK
53 CONFIG_FORTIFY_SOURCE | y | ubuntu18 | self_protection || OK
54 CONFIG_STRICT_DEVMEM | y | ubuntu18 | self_protection || OK
55 CONFIG_SYN_COOKIES | y | ubuntu18 | self_protection || OK
56 CONFIG_SECCOMP | y | ubuntu18 | self_protection || OK
57 CONFIG_SECCOMP_FILTER | y | ubuntu18 | self_protection || OK
58 CONFIG_MODULE_SIG | y | ubuntu18 | self_protection || OK
59 CONFIG_MODULE_SIG_ALL | y | ubuntu18 | self_protection || OK
60 CONFIG_MODULE_SIG_SHA512 | y | ubuntu18 | self_protection || OK
61 CONFIG_DEFAULT_MMAP_MIN_ADDR | 65536 | ubuntu18 | self_protection || OK
62 CONFIG_BUG_ON_DATA_CORRUPTION | y | kspp | self_protection || FAIL: "is not set"
63 CONFIG_PAGE_POISONING | y | kspp | self_protection || FAIL: "is not set"
64 CONFIG_GCC_PLUGINS | y | kspp | self_protection || FAIL: "is not set"
65 CONFIG_GCC_PLUGIN_RANDSTRUCT | y | kspp | self_protection || FAIL: not found
66 CONFIG_GCC_PLUGIN_STRUCTLEAK | y | kspp | self_protection || FAIL: not found
67 CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL | y | kspp | self_protection || FAIL: not found
68 CONFIG_GCC_PLUGIN_LATENT_ENTROPY | y | kspp | self_protection || FAIL: not found
69 CONFIG_IO_STRICT_DEVMEM | y | kspp | self_protection || FAIL: "is not set"
70 CONFIG_REFCOUNT_FULL | y | kspp | self_protection || FAIL: "is not set"
71 CONFIG_DEBUG_LIST | y | kspp | self_protection || FAIL: "is not set"
72 CONFIG_DEBUG_SG | y | kspp | self_protection || FAIL: "is not set"
73 CONFIG_DEBUG_CREDENTIALS | y | kspp | self_protection || FAIL: "is not set"
74 CONFIG_DEBUG_NOTIFIERS | y | kspp | self_protection || FAIL: "is not set"
75 CONFIG_MODULE_SIG_FORCE | y | kspp | self_protection || FAIL: "is not set"
76 CONFIG_HARDENED_USERCOPY_FALLBACK | is not set | kspp | self_protection || FAIL: not found
77 CONFIG_GCC_PLUGIN_STACKLEAK | y | my | self_protection || FAIL: not found
78 CONFIG_SLUB_DEBUG_ON | y | my | self_protection || FAIL: "is not set"
79 CONFIG_SECURITY_DMESG_RESTRICT | y | my | self_protection || FAIL: "is not set"
80 CONFIG_STATIC_USERMODEHELPER | y | my | self_protection || FAIL: "is not set"
81 CONFIG_PAGE_POISONING_NO_SANITY | is not set | my | self_protection || FAIL: not found
82 CONFIG_PAGE_POISONING_ZERO | is not set | my | self_protection || FAIL: not found
83 CONFIG_SECURITY | y | ubuntu18 | security_policy || OK
84 CONFIG_SECURITY_YAMA | y | ubuntu18 | security_policy || OK
85 CONFIG_SECURITY_SELINUX_DISABLE | is not set | ubuntu18 | security_policy || OK
86 CONFIG_ACPI_CUSTOM_METHOD | is not set | ubuntu18 | cut_attack_surface || OK
87 CONFIG_COMPAT_BRK | is not set | ubuntu18 | cut_attack_surface || OK
88 CONFIG_DEVKMEM | is not set | ubuntu18 | cut_attack_surface || OK
89 CONFIG_COMPAT_VDSO | is not set | ubuntu18 | cut_attack_surface || OK
90 CONFIG_LEGACY_VSYSCALL_NONE | y | kspp | cut_attack_surface || FAIL: "is not set"
91 CONFIG_BINFMT_MISC | is not set | kspp | cut_attack_surface || FAIL: "m"
92 CONFIG_INET_DIAG | is not set | kspp | cut_attack_surface || FAIL: "m"
93 CONFIG_KEXEC | is not set | kspp | cut_attack_surface || FAIL: "y"
94 CONFIG_PROC_KCORE | is not set | kspp | cut_attack_surface || FAIL: "y"
95 CONFIG_LEGACY_PTYS | is not set | kspp | cut_attack_surface || FAIL: "y"
96 CONFIG_IA32_EMULATION | is not set | kspp | cut_attack_surface || FAIL: "y"
97 CONFIG_X86_X32 | is not set | kspp | cut_attack_surface || FAIL: "y"
98 CONFIG_MODIFY_LDT_SYSCALL | is not set | kspp | cut_attack_surface || FAIL: "y"
99 CONFIG_HIBERNATION | is not set | kspp | cut_attack_surface || FAIL: "y"
100 CONFIG_KEXEC_FILE | is not set | my | cut_attack_surface || FAIL: "y"
101 CONFIG_LIVEPATCH | is not set | my | cut_attack_surface || FAIL: "y"
102 CONFIG_USER_NS | is not set | my | cut_attack_surface || FAIL: "y"
103 CONFIG_IP_DCCP | is not set | my | cut_attack_surface || FAIL: "m"
104 CONFIG_IP_SCTP | is not set | my | cut_attack_surface || FAIL: "m"
105 CONFIG_FTRACE | is not set | my | cut_attack_surface || FAIL: "y"
106 CONFIG_KPROBES | is not set | my | cut_attack_surface || FAIL: "y"
107 CONFIG_PROFILING | is not set | my | cut_attack_surface || FAIL: "y"
108 CONFIG_UPROBES | is not set | my | cut_attack_surface || FAIL: "y"
109 CONFIG_BPF_JIT | is not set | my | cut_attack_surface || FAIL: "y"
110 CONFIG_BPF_SYSCALL | is not set | my | cut_attack_surface || FAIL: "y"
111 CONFIG_ARCH_MMAP_RND_BITS | 32 | my |userspace_protection|| FAIL: "28"
112 CONFIG_LKDTM | m | my | feature_test || FAIL: "is not set"
114 [-] config check is NOT PASSED: 44 errors
117 __Go and fix them all!__
119 [1]: http://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project/Recommended_Settings