1# 2# Security configuration 3# 4 5menu "Security options" 6 7source security/keys/Kconfig 8 9config 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 21config 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 34config 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 43config 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 52config 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 65config 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 74config 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 104config 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 121source security/selinux/Kconfig 122source security/smack/Kconfig 123source security/tomoyo/Kconfig 124source security/apparmor/Kconfig 125source security/yama/Kconfig 126 127source security/integrity/Kconfig 128 129choice 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_YAMA if SECURITY_YAMA 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 150 151 config DEFAULT_SECURITY_APPARMOR 152 bool "AppArmor" if SECURITY_APPARMOR=y 153 154 config DEFAULT_SECURITY_YAMA 155 bool "Yama" if SECURITY_YAMA=y 156 157 config DEFAULT_SECURITY_DAC 158 bool "Unix Discretionary Access Controls" 159 160endchoice 161 162config 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 167 default "apparmor" if DEFAULT_SECURITY_APPARMOR 168 default "yama" if DEFAULT_SECURITY_YAMA 169 default "" if DEFAULT_SECURITY_DAC 170 171endmenu 172 173