Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | # |
| 2 | # Security configuration |
| 3 | # |
| 4 | |
| 5 | menu "Security options" |
| 6 | |
David Howells | f089494 | 2012-05-11 10:56:56 +0100 | [diff] [blame] | 7 | source security/keys/Kconfig |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | |
Dan Rosenberg | eaf06b2 | 2010-11-11 14:05:18 -0800 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | config SECURITY |
| 22 | bool "Enable different security models" |
Adrian Bunk | 2c40579 | 2005-08-22 18:20:50 +0200 | [diff] [blame] | 23 | depends on SYSFS |
Iulia Manda | 2813893 | 2015-04-15 16:16:41 -0700 | [diff] [blame] | 24 | depends on MULTIUSER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Eric Paris | da31894 | 2008-08-22 11:35:57 -0400 | [diff] [blame] | 34 | config SECURITYFS |
| 35 | bool "Enable the securityfs filesystem" |
| 36 | help |
| 37 | This will build the securityfs filesystem. It is currently used by |
Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 38 | the TPM bios character driver and IMA, an integrity provider. It is |
| 39 | not used by SELinux or SMACK. |
Eric Paris | da31894 | 2008-08-22 11:35:57 -0400 | [diff] [blame] | 40 | |
| 41 | If you are unsure how to answer this question, answer N. |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 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 | |
Kentaro Takeda | be6d3e5 | 2008-12-17 13:24:15 +0900 | [diff] [blame] | 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 | |
Joseph Cihula | 3162534 | 2009-06-30 19:30:59 -0700 | [diff] [blame] | 74 | config INTEL_TXT |
| 75 | bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)" |
Shane Wang | 69575d3 | 2009-09-01 18:25:07 -0700 | [diff] [blame] | 76 | depends on HAVE_INTEL_TXT |
Joseph Cihula | 3162534 | 2009-06-30 19:30:59 -0700 | [diff] [blame] | 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 | |
Arnaldo Carvalho de Melo | 3c556e4 | 2009-08-12 12:00:40 -0300 | [diff] [blame] | 84 | Intel TXT will provide higher assurance of system configuration and |
Joseph Cihula | 3162534 | 2009-06-30 19:30:59 -0700 | [diff] [blame] | 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 |
Arnaldo Carvalho de Melo | 3c556e4 | 2009-08-12 12:00:40 -0300 | [diff] [blame] | 93 | it was configured with, especially since they may be responsible for |
Joseph Cihula | 3162534 | 2009-06-30 19:30:59 -0700 | [diff] [blame] | 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 | |
Eric Paris | 788084a | 2009-07-31 12:54:11 -0400 | [diff] [blame] | 104 | config LSM_MMAP_MIN_ADDR |
Andreas Schwab | 024e6cb | 2009-08-18 22:14:29 +0200 | [diff] [blame] | 105 | int "Low address space for LSM to protect from user allocation" |
Eric Paris | 788084a | 2009-07-31 12:54:11 -0400 | [diff] [blame] | 106 | depends on SECURITY && SECURITY_SELINUX |
Colin Cross | 530b099 | 2014-02-04 02:15:32 +0000 | [diff] [blame] | 107 | default 32768 if ARM || (ARM64 && COMPAT) |
Dave Jones | a58578e | 2009-08-18 13:47:37 -0400 | [diff] [blame] | 108 | default 65536 |
Eric Paris | 788084a | 2009-07-31 12:54:11 -0400 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | source security/selinux/Kconfig |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 122 | source security/smack/Kconfig |
Kentaro Takeda | 00d7d6f | 2009-02-05 17:18:17 +0900 | [diff] [blame] | 123 | source security/tomoyo/Kconfig |
John Johansen | f9ad1af | 2010-07-29 14:48:08 -0700 | [diff] [blame] | 124 | source security/apparmor/Kconfig |
Kees Cook | 2d51448 | 2011-12-21 12:17:04 -0800 | [diff] [blame] | 125 | source security/yama/Kconfig |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Mimi Zohar | f381c27 | 2011-03-09 14:13:22 -0500 | [diff] [blame] | 127 | source security/integrity/Kconfig |
Mimi Zohar | 3323eec9 | 2009-02-04 09:06:58 -0500 | [diff] [blame] | 128 | |
John Johansen | 6e65f92 | 2009-11-05 17:03:20 -0800 | [diff] [blame] | 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 |
John Johansen | f9ad1af | 2010-07-29 14:48:08 -0700 | [diff] [blame] | 134 | default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR |
Kees Cook | 2d51448 | 2011-12-21 12:17:04 -0800 | [diff] [blame] | 135 | default DEFAULT_SECURITY_YAMA if SECURITY_YAMA |
John Johansen | 6e65f92 | 2009-11-05 17:03:20 -0800 | [diff] [blame] | 136 | default DEFAULT_SECURITY_DAC |
| 137 | |
| 138 | help |
| 139 | Select the security module that will be used by default if the |
| 140 | kernel parameter security= is not specified. |
| 141 | |
| 142 | config DEFAULT_SECURITY_SELINUX |
| 143 | bool "SELinux" if SECURITY_SELINUX=y |
| 144 | |
| 145 | config DEFAULT_SECURITY_SMACK |
| 146 | bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y |
| 147 | |
| 148 | config DEFAULT_SECURITY_TOMOYO |
| 149 | bool "TOMOYO" if SECURITY_TOMOYO=y |
| 150 | |
John Johansen | f9ad1af | 2010-07-29 14:48:08 -0700 | [diff] [blame] | 151 | config DEFAULT_SECURITY_APPARMOR |
| 152 | bool "AppArmor" if SECURITY_APPARMOR=y |
| 153 | |
Kees Cook | 2d51448 | 2011-12-21 12:17:04 -0800 | [diff] [blame] | 154 | config DEFAULT_SECURITY_YAMA |
| 155 | bool "Yama" if SECURITY_YAMA=y |
| 156 | |
John Johansen | 6e65f92 | 2009-11-05 17:03:20 -0800 | [diff] [blame] | 157 | config DEFAULT_SECURITY_DAC |
| 158 | bool "Unix Discretionary Access Controls" |
| 159 | |
| 160 | endchoice |
| 161 | |
| 162 | config DEFAULT_SECURITY |
| 163 | string |
| 164 | default "selinux" if DEFAULT_SECURITY_SELINUX |
| 165 | default "smack" if DEFAULT_SECURITY_SMACK |
| 166 | default "tomoyo" if DEFAULT_SECURITY_TOMOYO |
John Johansen | f9ad1af | 2010-07-29 14:48:08 -0700 | [diff] [blame] | 167 | default "apparmor" if DEFAULT_SECURITY_APPARMOR |
Kees Cook | 2d51448 | 2011-12-21 12:17:04 -0800 | [diff] [blame] | 168 | default "yama" if DEFAULT_SECURITY_YAMA |
John Johansen | 6e65f92 | 2009-11-05 17:03:20 -0800 | [diff] [blame] | 169 | default "" if DEFAULT_SECURITY_DAC |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | endmenu |
| 172 | |