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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
2# Security configuration
3#
4
5menu "Security options"
6
David Howellsf0894942012-05-11 10:56:56 +01007source security/keys/Kconfig
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
Dan Rosenbergeaf06b22010-11-11 14:05:18 -08009config SECURITY_DMESG_RESTRICT
10 bool "Restrict unprivileged access to the kernel syslog"
11 default n
12 help
13 This enforces restrictions on unprivileged users reading the kernel
14 syslog via dmesg(8).
15
16 If this option is not selected, no restrictions will be enforced
17 unless the dmesg_restrict sysctl is explicitly set to (1).
18
19 If you are unsure how to answer this question, answer N.
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021config SECURITY
22 bool "Enable different security models"
Adrian Bunk2c405792005-08-22 18:20:50 +020023 depends on SYSFS
Iulia Manda28138932015-04-15 16:16:41 -070024 depends on MULTIUSER
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 help
26 This allows you to choose different security modules to be
27 configured into your kernel.
28
29 If this option is not selected, the default Linux security
30 model will be used.
31
32 If you are unsure how to answer this question, answer N.
33
James Morrisdd0859d2017-02-15 00:17:24 +110034config SECURITY_WRITABLE_HOOKS
35 depends on SECURITY
36 bool
37 default n
38
Eric Parisda318942008-08-22 11:35:57 -040039config SECURITYFS
40 bool "Enable the securityfs filesystem"
41 help
42 This will build the securityfs filesystem. It is currently used by
Mimi Zohar3323eec92009-02-04 09:06:58 -050043 the TPM bios character driver and IMA, an integrity provider. It is
44 not used by SELinux or SMACK.
Eric Parisda318942008-08-22 11:35:57 -040045
46 If you are unsure how to answer this question, answer N.
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048config SECURITY_NETWORK
49 bool "Socket and Networking Security Hooks"
50 depends on SECURITY
51 help
52 This enables the socket and networking security hooks.
53 If enabled, a security module can use these hooks to
54 implement socket and networking access controls.
55 If you are unsure how to answer this question, answer N.
56
Daniel Jurgensd291f1a2017-05-19 15:48:52 +030057config SECURITY_INFINIBAND
58 bool "Infiniband Security Hooks"
59 depends on SECURITY && INFINIBAND
60 help
61 This enables the Infiniband security hooks.
62 If enabled, a security module can use these hooks to
63 implement Infiniband access controls.
64 If you are unsure how to answer this question, answer N.
65
Trent Jaegerdf718372005-12-13 23:12:27 -080066config SECURITY_NETWORK_XFRM
67 bool "XFRM (IPSec) Networking Security Hooks"
68 depends on XFRM && SECURITY_NETWORK
69 help
70 This enables the XFRM (IPSec) networking security hooks.
71 If enabled, a security module can use these hooks to
72 implement per-packet access controls based on labels
73 derived from IPSec policy. Non-IPSec communications are
74 designated as unlabelled, and only sockets authorized
75 to communicate unlabelled data can send without using
76 IPSec.
77 If you are unsure how to answer this question, answer N.
78
Kentaro Takedabe6d3e52008-12-17 13:24:15 +090079config SECURITY_PATH
80 bool "Security hooks for pathname based access control"
81 depends on SECURITY
82 help
83 This enables the security hooks for pathname based access control.
84 If enabled, a security module can use these hooks to
85 implement pathname based access controls.
86 If you are unsure how to answer this question, answer N.
87
Joseph Cihula31625342009-06-30 19:30:59 -070088config INTEL_TXT
89 bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)"
Shane Wang69575d32009-09-01 18:25:07 -070090 depends on HAVE_INTEL_TXT
Joseph Cihula31625342009-06-30 19:30:59 -070091 help
92 This option enables support for booting the kernel with the
93 Trusted Boot (tboot) module. This will utilize
94 Intel(R) Trusted Execution Technology to perform a measured launch
95 of the kernel. If the system does not support Intel(R) TXT, this
96 will have no effect.
97
Arnaldo Carvalho de Melo3c556e42009-08-12 12:00:40 -030098 Intel TXT will provide higher assurance of system configuration and
Joseph Cihula31625342009-06-30 19:30:59 -070099 initial state as well as data reset protection. This is used to
100 create a robust initial kernel measurement and verification, which
101 helps to ensure that kernel security mechanisms are functioning
102 correctly. This level of protection requires a root of trust outside
103 of the kernel itself.
104
105 Intel TXT also helps solve real end user concerns about having
106 confidence that their hardware is running the VMM or kernel that
Arnaldo Carvalho de Melo3c556e42009-08-12 12:00:40 -0300107 it was configured with, especially since they may be responsible for
Joseph Cihula31625342009-06-30 19:30:59 -0700108 providing such assurances to VMs and services running on it.
109
110 See <http://www.intel.com/technology/security/> for more information
111 about Intel(R) TXT.
112 See <http://tboot.sourceforge.net> for more information about tboot.
113 See Documentation/intel_txt.txt for a description of how to enable
114 Intel TXT support in a kernel boot.
115
116 If you are unsure as to whether this is required, answer N.
117
Eric Paris788084a2009-07-31 12:54:11 -0400118config LSM_MMAP_MIN_ADDR
Andreas Schwab024e6cb2009-08-18 22:14:29 +0200119 int "Low address space for LSM to protect from user allocation"
Eric Paris788084a2009-07-31 12:54:11 -0400120 depends on SECURITY && SECURITY_SELINUX
Colin Cross530b0992014-02-04 02:15:32 +0000121 default 32768 if ARM || (ARM64 && COMPAT)
Dave Jonesa58578e2009-08-18 13:47:37 -0400122 default 65536
Eric Paris788084a2009-07-31 12:54:11 -0400123 help
124 This is the portion of low virtual memory which should be protected
125 from userspace allocation. Keeping a user from writing to low pages
126 can help reduce the impact of kernel NULL pointer bugs.
127
128 For most ia64, ppc64 and x86 users with lots of address space
129 a value of 65536 is reasonable and should cause no problems.
130 On arm and other archs it should not be higher than 32768.
131 Programs which use vm86 functionality or have some need to map
132 this low address space will need the permission specific to the
133 systems running LSM.
134
Kees Cookf5509cc2016-06-07 11:05:33 -0700135config HAVE_HARDENED_USERCOPY_ALLOCATOR
136 bool
137 help
138 The heap allocator implements __check_heap_object() for
139 validating memory ranges against heap object sizes in
140 support of CONFIG_HARDENED_USERCOPY.
141
Kees Cookf5509cc2016-06-07 11:05:33 -0700142config HARDENED_USERCOPY
143 bool "Harden memory copies between kernel and userspace"
Linus Torvalds6040e572016-08-19 12:47:01 -0700144 depends on HAVE_HARDENED_USERCOPY_ALLOCATOR
Kees Cookf5509cc2016-06-07 11:05:33 -0700145 select BUG
146 help
147 This option checks for obviously wrong memory regions when
148 copying memory to/from the kernel (via copy_to_user() and
149 copy_from_user() functions) by rejecting memory ranges that
150 are larger than the specified heap object, span multiple
Geert Uytterhoeven99c55fb2017-05-02 20:27:41 +0200151 separately allocated pages, are not on the process stack,
Kees Cookf5509cc2016-06-07 11:05:33 -0700152 or are part of the kernel text. This kills entire classes
153 of heap overflow exploits and similar kernel memory exposures.
154
Kees Cook8e1f74e2016-09-07 09:54:34 -0700155config HARDENED_USERCOPY_PAGESPAN
156 bool "Refuse to copy allocations that span multiple pages"
157 depends on HARDENED_USERCOPY
Linus Torvalds80a77042016-09-07 14:03:49 -0700158 depends on EXPERT
Kees Cook8e1f74e2016-09-07 09:54:34 -0700159 help
160 When a multi-page allocation is done without __GFP_COMP,
161 hardened usercopy will reject attempts to copy it. There are,
162 however, several cases of this in the kernel that have not all
163 been removed. This config is intended to be used only while
164 trying to find such users.
165
Daniel Micay6974f0c2017-07-12 14:36:10 -0700166config FORTIFY_SOURCE
167 bool "Harden common str/mem functions against buffer overflows"
168 depends on ARCH_HAS_FORTIFY_SOURCE
169 help
170 Detect overflows of buffers in common string and memory functions
171 where the compiler can determine and validate the buffer sizes.
172
Greg Kroah-Hartman64e90a8a2017-01-16 16:22:39 +0100173config STATIC_USERMODEHELPER
174 bool "Force all usermode helper calls through a single binary"
175 help
176 By default, the kernel can call many different userspace
177 binary programs through the "usermode helper" kernel
178 interface. Some of these binaries are statically defined
179 either in the kernel code itself, or as a kernel configuration
180 option. However, some of these are dynamically created at
181 runtime, or can be modified after the kernel has started up.
182 To provide an additional layer of security, route all of these
183 calls through a single executable that can not have its name
184 changed.
185
186 Note, it is up to this single binary to then call the relevant
187 "real" usermode helper binary, based on the first argument
188 passed to it. If desired, this program can filter and pick
189 and choose what real programs are called.
190
191 If you wish for all usermode helper programs are to be
192 disabled, choose this option and then set
193 STATIC_USERMODEHELPER_PATH to an empty string.
194
195config STATIC_USERMODEHELPER_PATH
196 string "Path to the static usermode helper binary"
197 depends on STATIC_USERMODEHELPER
198 default "/sbin/usermode-helper"
199 help
200 The binary called by the kernel when any usermode helper
201 program is wish to be run. The "real" application's name will
202 be in the first argument passed to this program on the command
203 line.
204
205 If you wish for all usermode helper programs to be disabled,
206 specify an empty string here (i.e. "").
207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208source security/selinux/Kconfig
Casey Schauflere114e472008-02-04 22:29:50 -0800209source security/smack/Kconfig
Kentaro Takeda00d7d6f2009-02-05 17:18:17 +0900210source security/tomoyo/Kconfig
John Johansenf9ad1af2010-07-29 14:48:08 -0700211source security/apparmor/Kconfig
Kees Cook9b091552016-04-20 15:46:28 -0700212source security/loadpin/Kconfig
Kees Cook2d514482011-12-21 12:17:04 -0800213source security/yama/Kconfig
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Mimi Zoharf381c272011-03-09 14:13:22 -0500215source security/integrity/Kconfig
Mimi Zohar3323eec92009-02-04 09:06:58 -0500216
John Johansen6e65f922009-11-05 17:03:20 -0800217choice
218 prompt "Default security module"
219 default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX
220 default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
221 default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
John Johansenf9ad1af2010-07-29 14:48:08 -0700222 default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
John Johansen6e65f922009-11-05 17:03:20 -0800223 default DEFAULT_SECURITY_DAC
224
225 help
226 Select the security module that will be used by default if the
227 kernel parameter security= is not specified.
228
229 config DEFAULT_SECURITY_SELINUX
230 bool "SELinux" if SECURITY_SELINUX=y
231
232 config DEFAULT_SECURITY_SMACK
233 bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y
234
235 config DEFAULT_SECURITY_TOMOYO
236 bool "TOMOYO" if SECURITY_TOMOYO=y
237
John Johansenf9ad1af2010-07-29 14:48:08 -0700238 config DEFAULT_SECURITY_APPARMOR
239 bool "AppArmor" if SECURITY_APPARMOR=y
240
John Johansen6e65f922009-11-05 17:03:20 -0800241 config DEFAULT_SECURITY_DAC
242 bool "Unix Discretionary Access Controls"
243
244endchoice
245
246config DEFAULT_SECURITY
247 string
248 default "selinux" if DEFAULT_SECURITY_SELINUX
249 default "smack" if DEFAULT_SECURITY_SMACK
250 default "tomoyo" if DEFAULT_SECURITY_TOMOYO
John Johansenf9ad1af2010-07-29 14:48:08 -0700251 default "apparmor" if DEFAULT_SECURITY_APPARMOR
John Johansen6e65f922009-11-05 17:03:20 -0800252 default "" if DEFAULT_SECURITY_DAC
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254endmenu
255