2 # Security configuration
5 menu "Security options"
8 bool "Enable access key retention support"
10 This option provides support for retaining authentication tokens and
11 access keys in the kernel.
13 It also includes provision of methods by which such keys might be
14 associated with a process so that network filesystems, encryption
15 support and the like can find them.
17 Furthermore, a special type of key is available that acts as keyring:
18 a searchable sequence of keys. Each process is equipped with access
19 to five standard keyrings: UID-specific, GID-specific, session,
22 If you are unsure as to whether this is required, answer N.
24 config KEYS_DEBUG_PROC_KEYS
25 bool "Enable the /proc/keys file by which keys may be viewed"
28 This option turns on support for the /proc/keys file - through which
29 can be listed all the keys on the system that are viewable by the
32 The only keys included in the list are those that grant View
33 permission to the reading process whether or not it possesses them.
34 Note that LSM security checks are still performed, and may further
35 filter out keys that the current process is not authorised to view.
37 Only key attributes are listed here; key payloads are not included in
40 If you are unsure as to whether this is required, answer N.
43 bool "Enable different security models"
46 This allows you to choose different security modules to be
47 configured into your kernel.
49 If this option is not selected, the default Linux security
52 If you are unsure how to answer this question, answer N.
55 bool "Enable the securityfs filesystem"
57 This will build the securityfs filesystem. It is currently used by
58 the TPM bios character driver and IMA, an integrity provider. It is
59 not used by SELinux or SMACK.
61 If you are unsure how to answer this question, answer N.
63 config SECURITY_NETWORK
64 bool "Socket and Networking Security Hooks"
67 This enables the socket and networking security hooks.
68 If enabled, a security module can use these hooks to
69 implement socket and networking access controls.
70 If you are unsure how to answer this question, answer N.
72 config SECURITY_NETWORK_XFRM
73 bool "XFRM (IPSec) Networking Security Hooks"
74 depends on XFRM && SECURITY_NETWORK
76 This enables the XFRM (IPSec) networking security hooks.
77 If enabled, a security module can use these hooks to
78 implement per-packet access controls based on labels
79 derived from IPSec policy. Non-IPSec communications are
80 designated as unlabelled, and only sockets authorized
81 to communicate unlabelled data can send without using
83 If you are unsure how to answer this question, answer N.
86 bool "Security hooks for pathname based access control"
89 This enables the security hooks for pathname based access control.
90 If enabled, a security module can use these hooks to
91 implement pathname based access controls.
92 If you are unsure how to answer this question, answer N.
95 bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)"
96 depends on HAVE_INTEL_TXT
98 This option enables support for booting the kernel with the
99 Trusted Boot (tboot) module. This will utilize
100 Intel(R) Trusted Execution Technology to perform a measured launch
101 of the kernel. If the system does not support Intel(R) TXT, this
104 Intel TXT will provide higher assurance of system configuration and
105 initial state as well as data reset protection. This is used to
106 create a robust initial kernel measurement and verification, which
107 helps to ensure that kernel security mechanisms are functioning
108 correctly. This level of protection requires a root of trust outside
109 of the kernel itself.
111 Intel TXT also helps solve real end user concerns about having
112 confidence that their hardware is running the VMM or kernel that
113 it was configured with, especially since they may be responsible for
114 providing such assurances to VMs and services running on it.
116 See <http://www.intel.com/technology/security/> for more information
118 See <http://tboot.sourceforge.net> for more information about tboot.
119 See Documentation/intel_txt.txt for a description of how to enable
120 Intel TXT support in a kernel boot.
122 If you are unsure as to whether this is required, answer N.
124 config LSM_MMAP_MIN_ADDR
125 int "Low address space for LSM to protect from user allocation"
126 depends on SECURITY && SECURITY_SELINUX
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.
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
140 source security/selinux/Kconfig
141 source security/smack/Kconfig
142 source security/tomoyo/Kconfig
143 source security/apparmor/Kconfig
145 source security/integrity/ima/Kconfig
148 prompt "Default security module"
149 default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX
150 default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
151 default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
152 default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
153 default DEFAULT_SECURITY_DAC
156 Select the security module that will be used by default if the
157 kernel parameter security= is not specified.
159 config DEFAULT_SECURITY_SELINUX
160 bool "SELinux" if SECURITY_SELINUX=y
162 config DEFAULT_SECURITY_SMACK
163 bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y
165 config DEFAULT_SECURITY_TOMOYO
166 bool "TOMOYO" if SECURITY_TOMOYO=y
168 config DEFAULT_SECURITY_APPARMOR
169 bool "AppArmor" if SECURITY_APPARMOR=y
171 config DEFAULT_SECURITY_DAC
172 bool "Unix Discretionary Access Controls"
176 config DEFAULT_SECURITY
178 default "selinux" if DEFAULT_SECURITY_SELINUX
179 default "smack" if DEFAULT_SECURITY_SMACK
180 default "tomoyo" if DEFAULT_SECURITY_TOMOYO
181 default "apparmor" if DEFAULT_SECURITY_APPARMOR
182 default "" if DEFAULT_SECURITY_DAC