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1 #
2 # Security configuration
3 #
4
5 menu "Security options"
6
7 source security/keys/Kconfig
8
9 config 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
21 config SECURITY
22 bool "Enable different security models"
23 depends on SYSFS
24 depends on MULTIUSER
25 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
34 config SECURITYFS
35 bool "Enable the securityfs filesystem"
36 help
37 This will build the securityfs filesystem. It is currently used by
38 the TPM bios character driver and IMA, an integrity provider. It is
39 not used by SELinux or SMACK.
40
41 If you are unsure how to answer this question, answer N.
42
43 config SECURITY_NETWORK
44 bool "Socket and Networking Security Hooks"
45 depends on SECURITY
46 help
47 This enables the socket and networking security hooks.
48 If enabled, a security module can use these hooks to
49 implement socket and networking access controls.
50 If you are unsure how to answer this question, answer N.
51
52 config SECURITY_NETWORK_XFRM
53 bool "XFRM (IPSec) Networking Security Hooks"
54 depends on XFRM && SECURITY_NETWORK
55 help
56 This enables the XFRM (IPSec) networking security hooks.
57 If enabled, a security module can use these hooks to
58 implement per-packet access controls based on labels
59 derived from IPSec policy. Non-IPSec communications are
60 designated as unlabelled, and only sockets authorized
61 to communicate unlabelled data can send without using
62 IPSec.
63 If you are unsure how to answer this question, answer N.
64
65 config SECURITY_PATH
66 bool "Security hooks for pathname based access control"
67 depends on SECURITY
68 help
69 This enables the security hooks for pathname based access control.
70 If enabled, a security module can use these hooks to
71 implement pathname based access controls.
72 If you are unsure how to answer this question, answer N.
73
74 config INTEL_TXT
75 bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)"
76 depends on HAVE_INTEL_TXT
77 help
78 This option enables support for booting the kernel with the
79 Trusted Boot (tboot) module. This will utilize
80 Intel(R) Trusted Execution Technology to perform a measured launch
81 of the kernel. If the system does not support Intel(R) TXT, this
82 will have no effect.
83
84 Intel TXT will provide higher assurance of system configuration and
85 initial state as well as data reset protection. This is used to
86 create a robust initial kernel measurement and verification, which
87 helps to ensure that kernel security mechanisms are functioning
88 correctly. This level of protection requires a root of trust outside
89 of the kernel itself.
90
91 Intel TXT also helps solve real end user concerns about having
92 confidence that their hardware is running the VMM or kernel that
93 it was configured with, especially since they may be responsible for
94 providing such assurances to VMs and services running on it.
95
96 See <http://www.intel.com/technology/security/> for more information
97 about Intel(R) TXT.
98 See <http://tboot.sourceforge.net> for more information about tboot.
99 See Documentation/intel_txt.txt for a description of how to enable
100 Intel TXT support in a kernel boot.
101
102 If you are unsure as to whether this is required, answer N.
103
104 config LSM_MMAP_MIN_ADDR
105 int "Low address space for LSM to protect from user allocation"
106 depends on SECURITY && SECURITY_SELINUX
107 default 32768 if ARM || (ARM64 && COMPAT)
108 default 65536
109 help
110 This is the portion of low virtual memory which should be protected
111 from userspace allocation. Keeping a user from writing to low pages
112 can help reduce the impact of kernel NULL pointer bugs.
113
114 For most ia64, ppc64 and x86 users with lots of address space
115 a value of 65536 is reasonable and should cause no problems.
116 On arm and other archs it should not be higher than 32768.
117 Programs which use vm86 functionality or have some need to map
118 this low address space will need the permission specific to the
119 systems running LSM.
120
121 source security/selinux/Kconfig
122 source security/smack/Kconfig
123 source security/tomoyo/Kconfig
124 source security/apparmor/Kconfig
125 source security/yama/Kconfig
126
127 source security/integrity/Kconfig
128
129 choice
130 prompt "Default security module"
131 default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX
132 default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
133 default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
134 default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
135 default DEFAULT_SECURITY_DAC
136
137 help
138 Select the security module that will be used by default if the
139 kernel parameter security= is not specified.
140
141 config DEFAULT_SECURITY_SELINUX
142 bool "SELinux" if SECURITY_SELINUX=y
143
144 config DEFAULT_SECURITY_SMACK
145 bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y
146
147 config DEFAULT_SECURITY_TOMOYO
148 bool "TOMOYO" if SECURITY_TOMOYO=y
149
150 config DEFAULT_SECURITY_APPARMOR
151 bool "AppArmor" if SECURITY_APPARMOR=y
152
153 config DEFAULT_SECURITY_DAC
154 bool "Unix Discretionary Access Controls"
155
156 endchoice
157
158 config DEFAULT_SECURITY
159 string
160 default "selinux" if DEFAULT_SECURITY_SELINUX
161 default "smack" if DEFAULT_SECURITY_SMACK
162 default "tomoyo" if DEFAULT_SECURITY_TOMOYO
163 default "apparmor" if DEFAULT_SECURITY_APPARMOR
164 default "" if DEFAULT_SECURITY_DAC
165
166 endmenu
167