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1da177e4 LT |
1 | # |
2 | # Security configuration | |
3 | # | |
4 | ||
5 | menu "Security options" | |
6 | ||
f0894940 | 7 | source security/keys/Kconfig |
1da177e4 | 8 | |
eaf06b24 DR |
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 | ||
9d5f5d93 JVS |
21 | config SECURITY_PERF_EVENTS_RESTRICT |
22 | bool "Restrict unprivileged use of performance events" | |
23 | depends on PERF_EVENTS | |
24 | help | |
25 | If you say Y here, the kernel.perf_event_paranoid sysctl | |
26 | will be set to 3 by default, and no unprivileged use of the | |
27 | perf_event_open syscall will be permitted unless it is | |
28 | changed. | |
29 | ||
1da177e4 LT |
30 | config SECURITY |
31 | bool "Enable different security models" | |
2c40579b | 32 | depends on SYSFS |
2813893f | 33 | depends on MULTIUSER |
1da177e4 LT |
34 | help |
35 | This allows you to choose different security modules to be | |
36 | configured into your kernel. | |
37 | ||
38 | If this option is not selected, the default Linux security | |
39 | model will be used. | |
40 | ||
41 | If you are unsure how to answer this question, answer N. | |
42 | ||
3e1457d6 | 43 | config PAGE_TABLE_ISOLATION |
8a43ddfb | 44 | bool "Remove the kernel mapping in user mode" |
bed9bb7f | 45 | default y |
750fb627 | 46 | depends on X86_64 && SMP |
8a43ddfb | 47 | help |
d94df201 HD |
48 | This enforces a strict kernel and user space isolation, in order |
49 | to close hardware side channels on kernel address information. | |
50 | ||
51 | If you are unsure how to answer this question, answer Y. | |
1da177e4 | 52 | |
da31894e EP |
53 | config SECURITYFS |
54 | bool "Enable the securityfs filesystem" | |
55 | help | |
56 | This will build the securityfs filesystem. It is currently used by | |
3323eec9 MZ |
57 | the TPM bios character driver and IMA, an integrity provider. It is |
58 | not used by SELinux or SMACK. | |
da31894e EP |
59 | |
60 | If you are unsure how to answer this question, answer N. | |
61 | ||
1da177e4 LT |
62 | config SECURITY_NETWORK |
63 | bool "Socket and Networking Security Hooks" | |
64 | depends on SECURITY | |
65 | help | |
66 | This enables the socket and networking security hooks. | |
67 | If enabled, a security module can use these hooks to | |
68 | implement socket and networking access controls. | |
69 | If you are unsure how to answer this question, answer N. | |
df71837d TJ |
70 | |
71 | config SECURITY_NETWORK_XFRM | |
72 | bool "XFRM (IPSec) Networking Security Hooks" | |
73 | depends on XFRM && SECURITY_NETWORK | |
74 | help | |
75 | This enables the XFRM (IPSec) networking security hooks. | |
76 | If enabled, a security module can use these hooks to | |
77 | implement per-packet access controls based on labels | |
78 | derived from IPSec policy. Non-IPSec communications are | |
79 | designated as unlabelled, and only sockets authorized | |
80 | to communicate unlabelled data can send without using | |
81 | IPSec. | |
82 | If you are unsure how to answer this question, answer N. | |
1da177e4 | 83 | |
be6d3e56 KT |
84 | config SECURITY_PATH |
85 | bool "Security hooks for pathname based access control" | |
86 | depends on SECURITY | |
87 | help | |
88 | This enables the security hooks for pathname based access control. | |
89 | If enabled, a security module can use these hooks to | |
90 | implement pathname based access controls. | |
91 | If you are unsure how to answer this question, answer N. | |
92 | ||
31625340 JC |
93 | config INTEL_TXT |
94 | bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)" | |
69575d38 | 95 | depends on HAVE_INTEL_TXT |
31625340 JC |
96 | help |
97 | This option enables support for booting the kernel with the | |
98 | Trusted Boot (tboot) module. This will utilize | |
99 | Intel(R) Trusted Execution Technology to perform a measured launch | |
100 | of the kernel. If the system does not support Intel(R) TXT, this | |
101 | will have no effect. | |
102 | ||
3c556e41 | 103 | Intel TXT will provide higher assurance of system configuration and |
31625340 JC |
104 | initial state as well as data reset protection. This is used to |
105 | create a robust initial kernel measurement and verification, which | |
106 | helps to ensure that kernel security mechanisms are functioning | |
107 | correctly. This level of protection requires a root of trust outside | |
108 | of the kernel itself. | |
109 | ||
110 | Intel TXT also helps solve real end user concerns about having | |
111 | confidence that their hardware is running the VMM or kernel that | |
3c556e41 | 112 | it was configured with, especially since they may be responsible for |
31625340 JC |
113 | providing such assurances to VMs and services running on it. |
114 | ||
115 | See <http://www.intel.com/technology/security/> for more information | |
116 | about Intel(R) TXT. | |
117 | See <http://tboot.sourceforge.net> for more information about tboot. | |
118 | See Documentation/intel_txt.txt for a description of how to enable | |
119 | Intel TXT support in a kernel boot. | |
120 | ||
121 | If you are unsure as to whether this is required, answer N. | |
122 | ||
788084ab | 123 | config LSM_MMAP_MIN_ADDR |
024e6cb4 | 124 | int "Low address space for LSM to protect from user allocation" |
788084ab | 125 | depends on SECURITY && SECURITY_SELINUX |
530b099d | 126 | default 32768 if ARM || (ARM64 && COMPAT) |
a58578e4 | 127 | default 65536 |
788084ab EP |
128 | help |
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. | |
132 | ||
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 | |
138 | systems running LSM. | |
139 | ||
d677b310 KC |
140 | config HAVE_HARDENED_USERCOPY_ALLOCATOR |
141 | bool | |
142 | help | |
143 | The heap allocator implements __check_heap_object() for | |
144 | validating memory ranges against heap object sizes in | |
145 | support of CONFIG_HARDENED_USERCOPY. | |
146 | ||
147 | config HAVE_ARCH_HARDENED_USERCOPY | |
148 | bool | |
149 | help | |
150 | The architecture supports CONFIG_HARDENED_USERCOPY by | |
151 | calling check_object_size() just before performing the | |
152 | userspace copies in the low level implementation of | |
153 | copy_to_user() and copy_from_user(). | |
154 | ||
155 | config HARDENED_USERCOPY | |
156 | bool "Harden memory copies between kernel and userspace" | |
157 | depends on HAVE_ARCH_HARDENED_USERCOPY | |
ef1cf0cf | 158 | depends on HAVE_HARDENED_USERCOPY_ALLOCATOR |
d677b310 KC |
159 | select BUG |
160 | help | |
161 | This option checks for obviously wrong memory regions when | |
162 | copying memory to/from the kernel (via copy_to_user() and | |
163 | copy_from_user() functions) by rejecting memory ranges that | |
164 | are larger than the specified heap object, span multiple | |
165 | separately allocates pages, are not on the process stack, | |
166 | or are part of the kernel text. This kills entire classes | |
167 | of heap overflow exploits and similar kernel memory exposures. | |
168 | ||
92e04f8a KC |
169 | config HARDENED_USERCOPY_PAGESPAN |
170 | bool "Refuse to copy allocations that span multiple pages" | |
171 | depends on HARDENED_USERCOPY | |
172 | depends on !COMPILE_TEST | |
173 | help | |
174 | When a multi-page allocation is done without __GFP_COMP, | |
175 | hardened usercopy will reject attempts to copy it. There are, | |
176 | however, several cases of this in the kernel that have not all | |
177 | been removed. This config is intended to be used only while | |
178 | trying to find such users. | |
179 | ||
1da177e4 | 180 | source security/selinux/Kconfig |
e114e473 | 181 | source security/smack/Kconfig |
00d7d6f8 | 182 | source security/tomoyo/Kconfig |
f9ad1af5 | 183 | source security/apparmor/Kconfig |
2d514487 | 184 | source security/yama/Kconfig |
1cac41cb | 185 | source security/mstdrv/Kconfig |
1da177e4 | 186 | |
f381c272 | 187 | source security/integrity/Kconfig |
1cac41cb MB |
188 | source security/tz_iccc/Kconfig |
189 | source security/defex_lsm/Kconfig | |
190 | source security/dsms/Kconfig | |
3323eec9 | 191 | |
6e65f92f JJ |
192 | choice |
193 | prompt "Default security module" | |
194 | default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX | |
195 | default DEFAULT_SECURITY_SMACK if SECURITY_SMACK | |
196 | default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO | |
f9ad1af5 | 197 | default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR |
6e65f92f JJ |
198 | default DEFAULT_SECURITY_DAC |
199 | ||
200 | help | |
201 | Select the security module that will be used by default if the | |
202 | kernel parameter security= is not specified. | |
203 | ||
204 | config DEFAULT_SECURITY_SELINUX | |
205 | bool "SELinux" if SECURITY_SELINUX=y | |
206 | ||
207 | config DEFAULT_SECURITY_SMACK | |
208 | bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y | |
209 | ||
210 | config DEFAULT_SECURITY_TOMOYO | |
211 | bool "TOMOYO" if SECURITY_TOMOYO=y | |
212 | ||
f9ad1af5 JJ |
213 | config DEFAULT_SECURITY_APPARMOR |
214 | bool "AppArmor" if SECURITY_APPARMOR=y | |
215 | ||
6e65f92f JJ |
216 | config DEFAULT_SECURITY_DAC |
217 | bool "Unix Discretionary Access Controls" | |
218 | ||
219 | endchoice | |
220 | ||
221 | config DEFAULT_SECURITY | |
222 | string | |
223 | default "selinux" if DEFAULT_SECURITY_SELINUX | |
224 | default "smack" if DEFAULT_SECURITY_SMACK | |
225 | default "tomoyo" if DEFAULT_SECURITY_TOMOYO | |
f9ad1af5 | 226 | default "apparmor" if DEFAULT_SECURITY_APPARMOR |
6e65f92f JJ |
227 | default "" if DEFAULT_SECURITY_DAC |
228 | ||
1da177e4 LT |
229 | endmenu |
230 |