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.
54 config SECURITY_NETWORK
55 bool "Socket and Networking Security Hooks"
58 This enables the socket and networking security hooks.
59 If enabled, a security module can use these hooks to
60 implement socket and networking access controls.
61 If you are unsure how to answer this question, answer N.
63 config SECURITY_NETWORK_XFRM
64 bool "XFRM (IPSec) Networking Security Hooks"
65 depends on XFRM && SECURITY_NETWORK
67 This enables the XFRM (IPSec) networking security hooks.
68 If enabled, a security module can use these hooks to
69 implement per-packet access controls based on labels
70 derived from IPSec policy. Non-IPSec communications are
71 designated as unlabelled, and only sockets authorized
72 to communicate unlabelled data can send without using
74 If you are unsure how to answer this question, answer N.
76 config SECURITY_FILE_CAPABILITIES
77 bool "File POSIX Capabilities"
80 This enables filesystem capabilities, allowing you to give
81 binaries a subset of root's powers without using setuid 0.
83 If in doubt, answer N.
85 config SECURITY_ROOTPLUG
86 bool "Root Plug Support"
87 depends on USB=y && SECURITY
89 This is a sample LSM module that should only be used as such.
90 It prevents any programs running with egid == 0 if a specific
91 USB device is not present in the system.
93 See <http://www.linuxjournal.com/article.php?sid=6279> for
94 more information about this module.
96 If you are unsure how to answer this question, answer N.
98 config SECURITY_DEFAULT_MMAP_MIN_ADDR
99 int "Low address space to protect from user allocation"
103 This is the portion of low virtual memory which should be protected
104 from userspace allocation. Keeping a user from writing to low pages
105 can help reduce the impact of kernel NULL pointer bugs.
107 For most ia64, ppc64 and x86 users with lots of address space
108 a value of 65536 is reasonable and should cause no problems.
109 On arm and other archs it should not be higher than 32768.
110 Programs which use vm86 functionality would either need additional
111 permissions from either the LSM or the capabilities module or have
112 this protection disabled.
114 This value can be changed after boot using the
115 /proc/sys/vm/mmap_min_addr tunable.
118 source security/selinux/Kconfig
119 source security/smack/Kconfig