blob: 80a2934d3110881cfc11fd4fd74336f9a2104a50 [file] [log] [blame]
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
Jeff Vander Stoepd28f8562016-05-29 14:22:32 -070021config SECURITY_PERF_EVENTS_RESTRICT
22 bool "Restrict unprivileged use of performance events"
23 depends on PERF_EVENTS
24 help
25 If you say Y here, the kernel.perf_event_paranoid sysctl
26 will be set to 3 by default, and no unprivileged use of the
27 perf_event_open syscall will be permitted unless it is
28 changed.
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030config SECURITY
31 bool "Enable different security models"
Adrian Bunk2c405792005-08-22 18:20:50 +020032 depends on SYSFS
Iulia Manda28138932015-04-15 16:16:41 -070033 depends on MULTIUSER
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 help
35 This allows you to choose different security modules to be
36 configured into your kernel.
37
38 If this option is not selected, the default Linux security
39 model will be used.
40
41 If you are unsure how to answer this question, answer N.
42
Kees Cooke71fac02018-01-03 10:17:35 -080043config PAGE_TABLE_ISOLATION
Richard Fellner13be4482017-05-04 14:26:50 +020044 bool "Remove the kernel mapping in user mode"
Dave Hansen8f0baad2017-08-30 16:23:00 -070045 default y
Borislav Petkov2c272172018-01-02 14:19:49 +010046 depends on X86_64 && SMP
Richard Fellner13be4482017-05-04 14:26:50 +020047 help
Hugh Dickins639c0052017-09-13 14:03:10 -070048 This enforces a strict kernel and user space isolation, in order
49 to close hardware side channels on kernel address information.
50
51 If you are unsure how to answer this question, answer Y.
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Eric Parisda318942008-08-22 11:35:57 -040053config SECURITYFS
54 bool "Enable the securityfs filesystem"
55 help
56 This will build the securityfs filesystem. It is currently used by
Mimi Zohar3323eec92009-02-04 09:06:58 -050057 the TPM bios character driver and IMA, an integrity provider. It is
58 not used by SELinux or SMACK.
Eric Parisda318942008-08-22 11:35:57 -040059
60 If you are unsure how to answer this question, answer N.
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062config SECURITY_NETWORK
63 bool "Socket and Networking Security Hooks"
64 depends on SECURITY
65 help
66 This enables the socket and networking security hooks.
67 If enabled, a security module can use these hooks to
68 implement socket and networking access controls.
69 If you are unsure how to answer this question, answer N.
70
Trent Jaegerdf718372005-12-13 23:12:27 -080071config SECURITY_NETWORK_XFRM
72 bool "XFRM (IPSec) Networking Security Hooks"
73 depends on XFRM && SECURITY_NETWORK
74 help
75 This enables the XFRM (IPSec) networking security hooks.
76 If enabled, a security module can use these hooks to
77 implement per-packet access controls based on labels
78 derived from IPSec policy. Non-IPSec communications are
79 designated as unlabelled, and only sockets authorized
80 to communicate unlabelled data can send without using
81 IPSec.
82 If you are unsure how to answer this question, answer N.
83
Kentaro Takedabe6d3e52008-12-17 13:24:15 +090084config SECURITY_PATH
85 bool "Security hooks for pathname based access control"
86 depends on SECURITY
87 help
88 This enables the security hooks for pathname based access control.
89 If enabled, a security module can use these hooks to
90 implement pathname based access controls.
91 If you are unsure how to answer this question, answer N.
92
Joseph Cihula31625342009-06-30 19:30:59 -070093config INTEL_TXT
94 bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)"
Shane Wang69575d32009-09-01 18:25:07 -070095 depends on HAVE_INTEL_TXT
Joseph Cihula31625342009-06-30 19:30:59 -070096 help
97 This option enables support for booting the kernel with the
98 Trusted Boot (tboot) module. This will utilize
99 Intel(R) Trusted Execution Technology to perform a measured launch
100 of the kernel. If the system does not support Intel(R) TXT, this
101 will have no effect.
102
Arnaldo Carvalho de Melo3c556e42009-08-12 12:00:40 -0300103 Intel TXT will provide higher assurance of system configuration and
Joseph Cihula31625342009-06-30 19:30:59 -0700104 initial state as well as data reset protection. This is used to
105 create a robust initial kernel measurement and verification, which
106 helps to ensure that kernel security mechanisms are functioning
107 correctly. This level of protection requires a root of trust outside
108 of the kernel itself.
109
110 Intel TXT also helps solve real end user concerns about having
111 confidence that their hardware is running the VMM or kernel that
Arnaldo Carvalho de Melo3c556e42009-08-12 12:00:40 -0300112 it was configured with, especially since they may be responsible for
Joseph Cihula31625342009-06-30 19:30:59 -0700113 providing such assurances to VMs and services running on it.
114
115 See <http://www.intel.com/technology/security/> for more information
116 about Intel(R) TXT.
117 See <http://tboot.sourceforge.net> for more information about tboot.
118 See Documentation/intel_txt.txt for a description of how to enable
119 Intel TXT support in a kernel boot.
120
121 If you are unsure as to whether this is required, answer N.
122
Eric Paris788084a2009-07-31 12:54:11 -0400123config LSM_MMAP_MIN_ADDR
Andreas Schwab024e6cb2009-08-18 22:14:29 +0200124 int "Low address space for LSM to protect from user allocation"
Eric Paris788084a2009-07-31 12:54:11 -0400125 depends on SECURITY && SECURITY_SELINUX
Colin Cross530b0992014-02-04 02:15:32 +0000126 default 32768 if ARM || (ARM64 && COMPAT)
Dave Jonesa58578e2009-08-18 13:47:37 -0400127 default 65536
Eric Paris788084a2009-07-31 12:54:11 -0400128 help
129 This is the portion of low virtual memory which should be protected
130 from userspace allocation. Keeping a user from writing to low pages
131 can help reduce the impact of kernel NULL pointer bugs.
132
133 For most ia64, ppc64 and x86 users with lots of address space
134 a value of 65536 is reasonable and should cause no problems.
135 On arm and other archs it should not be higher than 32768.
136 Programs which use vm86 functionality or have some need to map
137 this low address space will need the permission specific to the
138 systems running LSM.
139
Kees Cookf5509cc2016-06-07 11:05:33 -0700140config HAVE_HARDENED_USERCOPY_ALLOCATOR
141 bool
142 help
143 The heap allocator implements __check_heap_object() for
144 validating memory ranges against heap object sizes in
145 support of CONFIG_HARDENED_USERCOPY.
146
147config HAVE_ARCH_HARDENED_USERCOPY
148 bool
149 help
150 The architecture supports CONFIG_HARDENED_USERCOPY by
151 calling check_object_size() just before performing the
152 userspace copies in the low level implementation of
153 copy_to_user() and copy_from_user().
154
155config HARDENED_USERCOPY
156 bool "Harden memory copies between kernel and userspace"
157 depends on HAVE_ARCH_HARDENED_USERCOPY
Linus Torvalds6040e572016-08-19 12:47:01 -0700158 depends on HAVE_HARDENED_USERCOPY_ALLOCATOR
Kees Cookf5509cc2016-06-07 11:05:33 -0700159 select BUG
160 help
161 This option checks for obviously wrong memory regions when
162 copying memory to/from the kernel (via copy_to_user() and
163 copy_from_user() functions) by rejecting memory ranges that
164 are larger than the specified heap object, span multiple
165 separately allocates pages, are not on the process stack,
166 or are part of the kernel text. This kills entire classes
167 of heap overflow exploits and similar kernel memory exposures.
168
Kees Cook8e1f74e2016-09-07 09:54:34 -0700169config HARDENED_USERCOPY_PAGESPAN
170 bool "Refuse to copy allocations that span multiple pages"
171 depends on HARDENED_USERCOPY
Linus Torvalds80a77042016-09-07 14:03:49 -0700172 depends on EXPERT
Kees Cook8e1f74e2016-09-07 09:54:34 -0700173 help
174 When a multi-page allocation is done without __GFP_COMP,
175 hardened usercopy will reject attempts to copy it. There are,
176 however, several cases of this in the kernel that have not all
177 been removed. This config is intended to be used only while
178 trying to find such users.
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180source security/selinux/Kconfig
Casey Schauflere114e472008-02-04 22:29:50 -0800181source security/smack/Kconfig
Kentaro Takeda00d7d6f2009-02-05 17:18:17 +0900182source security/tomoyo/Kconfig
John Johansenf9ad1af2010-07-29 14:48:08 -0700183source security/apparmor/Kconfig
Kees Cook9b091552016-04-20 15:46:28 -0700184source security/loadpin/Kconfig
Kees Cook2d514482011-12-21 12:17:04 -0800185source security/yama/Kconfig
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Mimi Zoharf381c272011-03-09 14:13:22 -0500187source security/integrity/Kconfig
Mimi Zohar3323eec92009-02-04 09:06:58 -0500188
John Johansen6e65f922009-11-05 17:03:20 -0800189choice
190 prompt "Default security module"
191 default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX
192 default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
193 default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
John Johansenf9ad1af2010-07-29 14:48:08 -0700194 default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
John Johansen6e65f922009-11-05 17:03:20 -0800195 default DEFAULT_SECURITY_DAC
196
197 help
198 Select the security module that will be used by default if the
199 kernel parameter security= is not specified.
200
201 config DEFAULT_SECURITY_SELINUX
202 bool "SELinux" if SECURITY_SELINUX=y
203
204 config DEFAULT_SECURITY_SMACK
205 bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y
206
207 config DEFAULT_SECURITY_TOMOYO
208 bool "TOMOYO" if SECURITY_TOMOYO=y
209
John Johansenf9ad1af2010-07-29 14:48:08 -0700210 config DEFAULT_SECURITY_APPARMOR
211 bool "AppArmor" if SECURITY_APPARMOR=y
212
John Johansen6e65f922009-11-05 17:03:20 -0800213 config DEFAULT_SECURITY_DAC
214 bool "Unix Discretionary Access Controls"
215
216endchoice
217
218config DEFAULT_SECURITY
219 string
220 default "selinux" if DEFAULT_SECURITY_SELINUX
221 default "smack" if DEFAULT_SECURITY_SMACK
222 default "tomoyo" if DEFAULT_SECURITY_TOMOYO
John Johansenf9ad1af2010-07-29 14:48:08 -0700223 default "apparmor" if DEFAULT_SECURITY_APPARMOR
John Johansen6e65f922009-11-05 17:03:20 -0800224 default "" if DEFAULT_SECURITY_DAC
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226endmenu
227