1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # General architecture dependent options
4 #
5
6 #
7 # Note: arch/$(SRCARCH)/Kconfig needs to be in
8 # override the default values in this file.
9 #
10 source "arch/$(SRCARCH)/Kconfig"
11
12 config ARCH_CONFIGURES_CPU_MITIGATIONS
13 bool
14
15 if !ARCH_CONFIGURES_CPU_MITIGATIONS
16 config CPU_MITIGATIONS
17 def_bool y
18 endif
19
20 menu "General architecture-dependent options"
21
22 config ARCH_HAS_SUBPAGE_FAULTS
23 bool
24 help
25 Select if the architecture can check
26 granularity (e.g. arm64 MTE). The pr
27 must be implemented.
28
29 config HOTPLUG_SMT
30 bool
31
32 config SMT_NUM_THREADS_DYNAMIC
33 bool
34
35 # Selected by HOTPLUG_CORE_SYNC_DEAD or HOTPLU
36 config HOTPLUG_CORE_SYNC
37 bool
38
39 # Basic CPU dead synchronization selected by a
40 config HOTPLUG_CORE_SYNC_DEAD
41 bool
42 select HOTPLUG_CORE_SYNC
43
44 # Full CPU synchronization with alive state se
45 config HOTPLUG_CORE_SYNC_FULL
46 bool
47 select HOTPLUG_CORE_SYNC_DEAD if HOTPL
48 select HOTPLUG_CORE_SYNC
49
50 config HOTPLUG_SPLIT_STARTUP
51 bool
52 select HOTPLUG_CORE_SYNC_FULL
53
54 config HOTPLUG_PARALLEL
55 bool
56 select HOTPLUG_SPLIT_STARTUP
57
58 config GENERIC_ENTRY
59 bool
60
61 config KPROBES
62 bool "Kprobes"
63 depends on HAVE_KPROBES
64 select KALLSYMS
65 select EXECMEM
66 select NEED_TASKS_RCU
67 help
68 Kprobes allows you to trap at almost
69 execute a callback function. regist
70 a probepoint and specifies the callb
71 for kernel debugging, non-intrusive
72 If in doubt, say "N".
73
74 config JUMP_LABEL
75 bool "Optimize very unlikely/likely br
76 depends on HAVE_ARCH_JUMP_LABEL
77 select OBJTOOL if HAVE_JUMP_LABEL_HACK
78 help
79 This option enables a transparent br
80 makes certain almost-always-true or
81 conditions even cheaper to execute w
82
83 Certain performance-sensitive kernel
84 scheduler functionality, networking
85 branches and include support for thi
86
87 If it is detected that the compiler
88 the kernel will compile such branche
89 instruction. When the condition flag
90 nop will be converted to a jump inst
91 conditional block of instructions.
92
93 This technique lowers overhead and s
94 of the processor and generally makes
95 of the condition is slower, but thos
96
97 ( On 32-bit x86, the necessary optio
98 flags may increase the size of the
99
100 config STATIC_KEYS_SELFTEST
101 bool "Static key selftest"
102 depends on JUMP_LABEL
103 help
104 Boot time self-test of the branch pa
105
106 config STATIC_CALL_SELFTEST
107 bool "Static call selftest"
108 depends on HAVE_STATIC_CALL
109 help
110 Boot time self-test of the call patc
111
112 config OPTPROBES
113 def_bool y
114 depends on KPROBES && HAVE_OPTPROBES
115 select NEED_TASKS_RCU
116
117 config KPROBES_ON_FTRACE
118 def_bool y
119 depends on KPROBES && HAVE_KPROBES_ON_
120 depends on DYNAMIC_FTRACE_WITH_REGS
121 help
122 If function tracer is enabled and th
123 passing of pt_regs to function traci
124 optimize on top of function tracing.
125
126 config UPROBES
127 def_bool n
128 depends on ARCH_SUPPORTS_UPROBES
129 help
130 Uprobes is the user-space counterpar
131 enable instrumentation applications
132 to establish unintrusive probes in u
133 libraries, by executing handler func
134 are hit by user-space applications.
135
136 ( These probes come in the form of s
137 managed by the kernel and kept tra
138 application. )
139
140 config HAVE_64BIT_ALIGNED_ACCESS
141 def_bool 64BIT && !HAVE_EFFICIENT_UNAL
142 help
143 Some architectures require 64 bit ac
144 aligned, which also requires structs
145 to be 64 bit aligned too. This inclu
146 architectures which can do 64 bit ac
147 architectures without unaligned acce
148
149 This symbol should be selected by an
150 accesses are required to be 64 bit a
151 though it is not a 64 bit architectu
152
153 See Documentation/core-api/unaligned
154 more information on the topic of una
155
156 config HAVE_EFFICIENT_UNALIGNED_ACCESS
157 bool
158 help
159 Some architectures are unable to per
160 without the use of get_unaligned/put
161 unable to perform such accesses effi
162 unaligned access and require fixing
163 handler.)
164
165 This symbol should be selected by an
166 perform unaligned accesses efficient
167 code paths to be selected for these
168 drivers, for example, could opt to n
169 problems with received packets if do
170 much.
171
172 See Documentation/core-api/unaligned
173 information on the topic of unaligne
174
175 config ARCH_USE_BUILTIN_BSWAP
176 bool
177 help
178 Modern versions of GCC (since 4.4) h
179 for handling byte-swapping. Using th
180 inline assembler that the architectu
181 __arch_bswapXX() macros, allows the
182 happening and offers more opportunit
183 particular, the compiler will be abl
184 with a nearby load or store and use
185 store-and-swap instructions if the a
186 should almost *never* result in code
187 hand-coded assembler in <asm/swab.h>
188 does, the use of the builtins is opt
189
190 Any architecture with load-and-swap
191 instructions should set this. And it
192 on architectures that don't have suc
193
194 config KRETPROBES
195 def_bool y
196 depends on KPROBES && (HAVE_KRETPROBES
197
198 config KRETPROBE_ON_RETHOOK
199 def_bool y
200 depends on HAVE_RETHOOK
201 depends on KRETPROBES
202 select RETHOOK
203
204 config USER_RETURN_NOTIFIER
205 bool
206 depends on HAVE_USER_RETURN_NOTIFIER
207 help
208 Provide a kernel-internal notificati
209 switch to user mode.
210
211 config HAVE_IOREMAP_PROT
212 bool
213
214 config HAVE_KPROBES
215 bool
216
217 config HAVE_KRETPROBES
218 bool
219
220 config HAVE_OPTPROBES
221 bool
222
223 config HAVE_KPROBES_ON_FTRACE
224 bool
225
226 config ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
227 bool
228 help
229 Since kretprobes modifies return add
230 stacktrace may see the kretprobe tra
231 of correct one. If the architecture
232 unwinder can adjust such entries, se
233
234 config HAVE_FUNCTION_ERROR_INJECTION
235 bool
236
237 config HAVE_NMI
238 bool
239
240 config HAVE_FUNCTION_DESCRIPTORS
241 bool
242
243 config TRACE_IRQFLAGS_SUPPORT
244 bool
245
246 config TRACE_IRQFLAGS_NMI_SUPPORT
247 bool
248
249 #
250 # An arch should select this if it provides al
251 #
252 # task_pt_regs() in asm/process
253 # arch_has_single_step() if there is ha
254 # arch_has_block_step() if there is ha
255 # asm/syscall.h supplying asm-
256 # linux/regset.h user_regset in
257 # CORE_DUMP_USE_REGSET #define'd in l
258 # TIF_SYSCALL_TRACE calls ptrace_r
259 # TIF_NOTIFY_RESUME calls resume_u
260 #
261 config HAVE_ARCH_TRACEHOOK
262 bool
263
264 config HAVE_DMA_CONTIGUOUS
265 bool
266
267 config GENERIC_SMP_IDLE_THREAD
268 bool
269
270 config GENERIC_IDLE_POLL_SETUP
271 bool
272
273 config ARCH_HAS_FORTIFY_SOURCE
274 bool
275 help
276 An architecture should select this w
277 build and run with CONFIG_FORTIFY_SO
278
279 #
280 # Select if the arch provides a historic keepi
281 # command line option
282 #
283 config ARCH_HAS_KEEPINITRD
284 bool
285
286 # Select if arch has all set_memory_ro/rw/x/nx
287 config ARCH_HAS_SET_MEMORY
288 bool
289
290 # Select if arch has all set_direct_map_invali
291 config ARCH_HAS_SET_DIRECT_MAP
292 bool
293
294 #
295 # Select if the architecture provides the arch
296 # either provide an uncached segment alias for
297 # to remap the page tables in place.
298 #
299 config ARCH_HAS_DMA_SET_UNCACHED
300 bool
301
302 #
303 # Select if the architectures provides the arc
304 # to undo an in-place page table remap for unc
305 #
306 config ARCH_HAS_DMA_CLEAR_UNCACHED
307 bool
308
309 config ARCH_HAS_CPU_FINALIZE_INIT
310 bool
311
312 # The architecture has a per-task state that i
313 config ARCH_HAS_CPU_PASID
314 bool
315 select IOMMU_MM_DATA
316
317 config HAVE_ARCH_THREAD_STRUCT_WHITELIST
318 bool
319 help
320 An architecture should select this t
321 knowledge about what region of the t
322 whitelisted for copying to userspace
323 FPU registers. Specifically, arch_th
324 should be implemented. Without this,
325 field in task_struct will be left wh
326
327 # Select if arch wants to size task_struct dyn
328 config ARCH_WANTS_DYNAMIC_TASK_STRUCT
329 bool
330
331 config ARCH_WANTS_NO_INSTR
332 bool
333 help
334 An architecture should select this i
335 functions to denote that the toolcha
336 functions and is required for correc
337
338 config ARCH_32BIT_OFF_T
339 bool
340 depends on !64BIT
341 help
342 All new 32-bit architectures should
343 userspace side which corresponds to
344 is the requirement for modern ABIs.
345 still support 32-bit off_t. This opt
346 architectures explicitly.
347
348 # Selected by 64 bit architectures which have
349 config ARCH_32BIT_USTAT_F_TINODE
350 bool
351
352 config HAVE_ASM_MODVERSIONS
353 bool
354 help
355 This symbol should be selected by an
356 <asm/asm-prototypes.h> to support th
357 exported from assembly code.
358
359 config HAVE_REGS_AND_STACK_ACCESS_API
360 bool
361 help
362 This symbol should be selected by an
363 the API needed to access registers a
364 declared in asm/ptrace.h
365 For example the kprobes-based event
366
367 config HAVE_RSEQ
368 bool
369 depends on HAVE_REGS_AND_STACK_ACCESS_
370 help
371 This symbol should be selected by an
372 supports an implementation of restar
373
374 config HAVE_RUST
375 bool
376 help
377 This symbol should be selected by an
378 supports Rust.
379
380 config HAVE_FUNCTION_ARG_ACCESS_API
381 bool
382 help
383 This symbol should be selected by an
384 the API needed to access function ar
385 declared in asm/ptrace.h
386
387 config HAVE_HW_BREAKPOINT
388 bool
389 depends on PERF_EVENTS
390
391 config HAVE_MIXED_BREAKPOINTS_REGS
392 bool
393 depends on HAVE_HW_BREAKPOINT
394 help
395 Depending on the arch implementation
396 some of them have separate registers
397 breakpoints addresses, others have m
398 them but define the access type in a
399 Select this option if your arch impl
400 latter fashion.
401
402 config HAVE_USER_RETURN_NOTIFIER
403 bool
404
405 config HAVE_PERF_EVENTS_NMI
406 bool
407 help
408 System hardware can generate an NMI
409 subsystem. Also has support for cal
410 to determine how many clock cycles i
411
412 config HAVE_HARDLOCKUP_DETECTOR_PERF
413 bool
414 depends on HAVE_PERF_EVENTS_NMI
415 help
416 The arch chooses to use the generic
417 detector. Must define HAVE_PERF_EVEN
418
419 config HAVE_HARDLOCKUP_DETECTOR_ARCH
420 bool
421 help
422 The arch provides its own hardlockup
423 of the generic ones.
424
425 It uses the same command line parame
426 as the generic hardlockup detectors.
427
428 config HAVE_PERF_REGS
429 bool
430 help
431 Support selective register dumps for
432 bit-mapping of each registers and a
433
434 config HAVE_PERF_USER_STACK_DUMP
435 bool
436 help
437 Support user stack dumps for perf ev
438 access to the user stack pointer whi
439 architectures.
440
441 config HAVE_ARCH_JUMP_LABEL
442 bool
443
444 config HAVE_ARCH_JUMP_LABEL_RELATIVE
445 bool
446
447 config MMU_GATHER_TABLE_FREE
448 bool
449
450 config MMU_GATHER_RCU_TABLE_FREE
451 bool
452 select MMU_GATHER_TABLE_FREE
453
454 config MMU_GATHER_PAGE_SIZE
455 bool
456
457 config MMU_GATHER_NO_RANGE
458 bool
459 select MMU_GATHER_MERGE_VMAS
460
461 config MMU_GATHER_NO_FLUSH_CACHE
462 bool
463
464 config MMU_GATHER_MERGE_VMAS
465 bool
466
467 config MMU_GATHER_NO_GATHER
468 bool
469 depends on MMU_GATHER_TABLE_FREE
470
471 config ARCH_WANT_IRQS_OFF_ACTIVATE_MM
472 bool
473 help
474 Temporary select until all architect
475 irqs disabled over activate_mm. Arch
476 shootdowns should enable this.
477
478 # Use normal mm refcounting for MMU_LAZY_TLB k
479 # MMU_LAZY_TLB_REFCOUNT=n can improve the scal
480 # to/from kernel threads when the same mm is r
481 # multi-threaded application), by reducing con
482 #
483 # This can be disabled if the architecture ens
484 # "lazy tlb" beyond its final refcount (i.e.,
485 # or its kernel page tables). This could be ar
486 # final exit(2) TLB flush, for example.
487 #
488 # To implement this, an arch *must*:
489 # Ensure the _lazy_tlb variants of mmgrab/mmdr
490 # the lazy tlb reference of a kthread's ->acti
491 # converted already).
492 config MMU_LAZY_TLB_REFCOUNT
493 def_bool y
494 depends on !MMU_LAZY_TLB_SHOOTDOWN
495
496 # This option allows MMU_LAZY_TLB_REFCOUNT=n.
497 # mm as a lazy tlb beyond its last reference c
498 # users before the mm is deallocated. __mmdrop
499 # be using the mm as a lazy tlb, so that they
500 # init_mm for their active mm. mm_cpumask(mm)
501 # may be using mm as a lazy tlb mm.
502 #
503 # To implement this, an arch *must*:
504 # - At the time of the final mmdrop of the mm,
505 # at least all possible CPUs in which the mm
506 # - It must meet the requirements for MMU_LAZY
507 config MMU_LAZY_TLB_SHOOTDOWN
508 bool
509
510 config ARCH_HAVE_NMI_SAFE_CMPXCHG
511 bool
512
513 config ARCH_HAVE_EXTRA_ELF_NOTES
514 bool
515 help
516 An architecture should select this i
517 arch-specific ELF note section to co
518 functions: elf_coredump_extra_notes_
519 elf_coredump_extra_notes_write() whi
520 dumper.
521
522 config ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
523 bool
524
525 config HAVE_ALIGNED_STRUCT_PAGE
526 bool
527 help
528 This makes sure that struct pages ar
529 e.g. the SLUB allocator can perform
530 on a struct page for better performa
531 might increase the size of a struct
532
533 config HAVE_CMPXCHG_LOCAL
534 bool
535
536 config HAVE_CMPXCHG_DOUBLE
537 bool
538
539 config ARCH_WEAK_RELEASE_ACQUIRE
540 bool
541
542 config ARCH_WANT_IPC_PARSE_VERSION
543 bool
544
545 config ARCH_WANT_COMPAT_IPC_PARSE_VERSION
546 bool
547
548 config ARCH_WANT_OLD_COMPAT_IPC
549 select ARCH_WANT_COMPAT_IPC_PARSE_VERS
550 bool
551
552 config HAVE_ARCH_SECCOMP
553 bool
554 help
555 An arch should select this symbol to
556 syscall policy), and must provide an
557 and compat syscalls if the asm-gener
558 - __NR_seccomp_read_32
559 - __NR_seccomp_write_32
560 - __NR_seccomp_exit_32
561 - __NR_seccomp_sigreturn_32
562
563 config HAVE_ARCH_SECCOMP_FILTER
564 bool
565 select HAVE_ARCH_SECCOMP
566 help
567 An arch should select this symbol if
568 - all the requirements for HAVE_ARCH
569 - syscall_get_arch()
570 - syscall_get_arguments()
571 - syscall_rollback()
572 - syscall_set_return_value()
573 - SIGSYS siginfo_t support
574 - secure_computing is called from a
575 - secure_computing return value is c
576 results in the system call being s
577 - seccomp syscall wired up
578 - if !HAVE_SPARSE_SYSCALL_NR, have S
579 SECCOMP_ARCH_NATIVE_NR, SECCOMP_AR
580 COMPAT is supported, have the SECC
581
582 config SECCOMP
583 prompt "Enable seccomp to safely execu
584 def_bool y
585 depends on HAVE_ARCH_SECCOMP
586 help
587 This kernel feature is useful for nu
588 that may need to handle untrusted by
589 execution. By using pipes or other t
590 to the process as file descriptors s
591 syscalls, it's possible to isolate t
592 own address space using seccomp. Onc
593 prctl(PR_SET_SECCOMP) or the seccomp
594 disabled and the task is only allowe
595 syscalls defined by each seccomp mod
596
597 If unsure, say Y.
598
599 config SECCOMP_FILTER
600 def_bool y
601 depends on HAVE_ARCH_SECCOMP_FILTER &&
602 help
603 Enable tasks to build secure computi
604 in terms of Berkeley Packet Filter p
605 task-defined system call filtering p
606
607 See Documentation/userspace-api/secc
608
609 config SECCOMP_CACHE_DEBUG
610 bool "Show seccomp filter cache status
611 depends on SECCOMP_FILTER && !HAVE_SPA
612 depends on PROC_FS
613 help
614 This enables the /proc/pid/seccomp_c
615 seccomp cache data. The file format
616 the file requires CAP_SYS_ADMIN.
617
618 This option is for debugging only. E
619 an adversary may be able to infer th
620
621 If unsure, say N.
622
623 config HAVE_ARCH_STACKLEAK
624 bool
625 help
626 An architecture should select this i
627 fills the used part of the kernel st
628 value before returning from system c
629
630 config HAVE_STACKPROTECTOR
631 bool
632 help
633 An arch should select this symbol if
634 - it has implemented a stack canary
635
636 config STACKPROTECTOR
637 bool "Stack Protector buffer overflow
638 depends on HAVE_STACKPROTECTOR
639 depends on $(cc-option,-fstack-protect
640 default y
641 help
642 This option turns on the "stack-prot
643 feature puts, at the beginning of fu
644 the stack just before the return add
645 the value just before actually retur
646 overflows (that need to overwrite th
647 overwrite the canary, which gets det
648 neutralized via a kernel panic.
649
650 Functions will have the stack-protec
651 have an 8-byte or larger character a
652
653 This feature requires gcc version 4.
654 gcc with the feature backported ("-f
655
656 On an x86 "defconfig" build, this fe
657 about 3% of all kernel functions, wh
658 by about 0.3%.
659
660 config STACKPROTECTOR_STRONG
661 bool "Strong Stack Protector"
662 depends on STACKPROTECTOR
663 depends on $(cc-option,-fstack-protect
664 default y
665 help
666 Functions will have the stack-protec
667 of the following conditions:
668
669 - local variable's address used as p
670 assignment or function argument
671 - local variable is an array (or uni
672 regardless of array type or length
673 - uses register local variables
674
675 This feature requires gcc version 4.
676 gcc with the feature backported ("-f
677
678 On an x86 "defconfig" build, this fe
679 about 20% of all kernel functions, w
680 size by about 2%.
681
682 config ARCH_SUPPORTS_SHADOW_CALL_STACK
683 bool
684 help
685 An architecture should select this i
686 Shadow Call Stack and implements run
687 switching.
688
689 config SHADOW_CALL_STACK
690 bool "Shadow Call Stack"
691 depends on ARCH_SUPPORTS_SHADOW_CALL_S
692 depends on DYNAMIC_FTRACE_WITH_ARGS ||
693 depends on MMU
694 help
695 This option enables the compiler's S
696 uses a shadow stack to protect funct
697 being overwritten by an attacker. Mo
698 in the compiler's documentation:
699
700 - Clang: https://clang.llvm.org/docs
701 - GCC: https://gcc.gnu.org/onlinedoc
702
703 Note that security guarantees in the
704 ones documented for user space. The
705 of shadow stacks in memory, which me
706 reading and writing arbitrary memory
707 and hijack control flow by modifying
708
709 config DYNAMIC_SCS
710 bool
711 help
712 Set by the arch code if it relies on
713 shadow call stack push and pop instr
714 compiler.
715
716 config LTO
717 bool
718 help
719 Selected if the kernel will be built
720
721 config LTO_CLANG
722 bool
723 select LTO
724 help
725 Selected if the kernel will be built
726
727 config ARCH_SUPPORTS_LTO_CLANG
728 bool
729 help
730 An architecture should select this o
731 - compiling with Clang,
732 - compiling inline assembly with Cla
733 - and linking with LLD.
734
735 config ARCH_SUPPORTS_LTO_CLANG_THIN
736 bool
737 help
738 An architecture should select this o
739 ThinLTO mode.
740
741 config HAS_LTO_CLANG
742 def_bool y
743 depends on CC_IS_CLANG && LD_IS_LLD &&
744 depends on $(success,$(NM) --help | he
745 depends on $(success,$(AR) --help | he
746 depends on ARCH_SUPPORTS_LTO_CLANG
747 depends on !FTRACE_MCOUNT_USE_RECORDMC
748 # https://github.com/ClangBuiltLinux/l
749 depends on (!KASAN || KASAN_HW_TAGS ||
750 depends on (!KCOV || CLANG_VERSION >=
751 depends on !GCOV_KERNEL
752 help
753 The compiler and Kconfig options sup
754 LTO.
755
756 choice
757 prompt "Link Time Optimization (LTO)"
758 default LTO_NONE
759 help
760 This option enables Link Time Optimi
761 compiler to optimize binaries global
762
763 If unsure, select LTO_NONE. Note tha
764 so it's disabled by default.
765
766 config LTO_NONE
767 bool "None"
768 help
769 Build the kernel normally, without L
770
771 config LTO_CLANG_FULL
772 bool "Clang Full LTO (EXPERIMENTAL)"
773 depends on HAS_LTO_CLANG
774 depends on !COMPILE_TEST
775 select LTO_CLANG
776 help
777 This option enables Clang's full Lin
778 allows the compiler to optimize the
779 this option, the compiler generates
780 object files, and the actual compila
781 the LTO link step, which may take se
782 kernel configuration. More informati
783 documentation:
784
785 https://llvm.org/docs/LinkTimeOpti
786
787 During link time, this option can us
788 may take much longer than the ThinLT
789
790 config LTO_CLANG_THIN
791 bool "Clang ThinLTO (EXPERIMENTAL)"
792 depends on HAS_LTO_CLANG && ARCH_SUPPO
793 select LTO_CLANG
794 help
795 This option enables Clang's ThinLTO,
796 optimization and faster incremental
797 CONFIG_LTO_CLANG_FULL option. More i
798 from Clang's documentation:
799
800 https://clang.llvm.org/docs/ThinLT
801
802 If unsure, say Y.
803 endchoice
804
805 config ARCH_SUPPORTS_CFI_CLANG
806 bool
807 help
808 An architecture should select this o
809 Control-Flow Integrity (CFI) checkin
810
811 config ARCH_USES_CFI_TRAPS
812 bool
813
814 config CFI_CLANG
815 bool "Use Clang's Control Flow Integri
816 depends on ARCH_SUPPORTS_CFI_CLANG
817 depends on $(cc-option,-fsanitize=kcfi
818 help
819 This option enables Clang's forward-
820 (CFI) checking, where the compiler i
821 indirect function call to ensure the
822 the correct static type. This restri
823 makes it more difficult for an attac
824 the modification of stored function
825 found from Clang's documentation:
826
827 https://clang.llvm.org/docs/Contro
828
829 config CFI_PERMISSIVE
830 bool "Use CFI in permissive mode"
831 depends on CFI_CLANG
832 help
833 When selected, Control Flow Integrit
834 warning instead of a kernel panic. T
835 for finding indirect call type misma
836
837 If unsure, say N.
838
839 config HAVE_ARCH_WITHIN_STACK_FRAMES
840 bool
841 help
842 An architecture should select this i
843 frames to determine if an object is
844 or local variables (i.e. that it exc
845 and similar) by implementing an inli
846 which is used by CONFIG_HARDENED_USE
847
848 config HAVE_CONTEXT_TRACKING_USER
849 bool
850 help
851 Provide kernel/user boundaries probe
852 that need it, such as userspace RCU
853 Syscalls need to be wrapped inside u
854 optimized behind static key or throu
855 flag. Exceptions handlers must be wr
856 protected inside ct_irq_enter/ct_irq
857 handling on irq exit still need to b
858
859 config HAVE_CONTEXT_TRACKING_USER_OFFSTACK
860 bool
861 help
862 Architecture neither relies on excep
863 nor on schedule_user(). Also preempt
864 preempt_schedule_irq() can't be call
865 while context tracking is CONTEXT_US
866 entry implementation where the follo
867 critical entry code, ie: before user
868
869 - Critical entry code isn't preempti
870 not interruptible).
871 - No use of RCU read side critical s
872 got called.
873 - No use of instrumentation, unless
874 called.
875
876 config HAVE_TIF_NOHZ
877 bool
878 help
879 Arch relies on TIF_NOHZ and syscall
880 tracking calls to user_enter()/user_
881
882 config HAVE_VIRT_CPU_ACCOUNTING
883 bool
884
885 config HAVE_VIRT_CPU_ACCOUNTING_IDLE
886 bool
887 help
888 Architecture has its own way to acco
889 doesn't implement vtime_account_idle
890
891 config ARCH_HAS_SCALED_CPUTIME
892 bool
893
894 config HAVE_VIRT_CPU_ACCOUNTING_GEN
895 bool
896 default y if 64BIT
897 help
898 With VIRT_CPU_ACCOUNTING_GEN, cputim
899 Before enabling this option, arch co
900 to ensure there are no races in conc
901 cputime_t. For example, reading/writ
902 some 32-bit arches may require multi
903 locking is needed to protect against
904
905 config HAVE_IRQ_TIME_ACCOUNTING
906 bool
907 help
908 Archs need to ensure they use a high
909 support irq time accounting and then
910
911 config HAVE_MOVE_PUD
912 bool
913 help
914 Architectures that select this are a
915 PUD level. If there are only 3 page
916 happens at the PGD level.
917
918 config HAVE_MOVE_PMD
919 bool
920 help
921 Archs that select this are able to m
922
923 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
924 bool
925
926 config HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
927 bool
928
929 config HAVE_ARCH_HUGE_VMAP
930 bool
931
932 #
933 # Archs that select this would be capable of
934 # arch_vmap_pmd_supported() returns true). Th
935 # must be used to enable allocations to use h
936 #
937 config HAVE_ARCH_HUGE_VMALLOC
938 depends on HAVE_ARCH_HUGE_VMAP
939 bool
940
941 config ARCH_WANT_HUGE_PMD_SHARE
942 bool
943
944 # Archs that want to use pmd_mkwrite on kernel
945 # if there are no userspace memory management
946 config ARCH_WANT_KERNEL_PMD_MKWRITE
947 bool
948
949 config ARCH_WANT_PMD_MKWRITE
950 def_bool TRANSPARENT_HUGEPAGE || ARCH_
951
952 config HAVE_ARCH_SOFT_DIRTY
953 bool
954
955 config HAVE_MOD_ARCH_SPECIFIC
956 bool
957 help
958 The arch uses struct mod_arch_specif
959 just need a simple module loader wit
960 should not enable this.
961
962 config MODULES_USE_ELF_RELA
963 bool
964 help
965 Modules only use ELF RELA relocation
966 relocations will give an error.
967
968 config MODULES_USE_ELF_REL
969 bool
970 help
971 Modules only use ELF REL relocations
972 relocations will give an error.
973
974 config ARCH_WANTS_MODULES_DATA_IN_VMALLOC
975 bool
976 help
977 For architectures like powerpc/32 wh
978 allocation and need to allocate modu
979
980 config ARCH_WANTS_EXECMEM_LATE
981 bool
982 help
983 For architectures that do not alloca
984 boot, but rather require its initial
985 enough entropy for module space rand
986 arm64.
987
988 config HAVE_IRQ_EXIT_ON_IRQ_STACK
989 bool
990 help
991 Architecture doesn't only execute th
992 but also irq_exit(). This way we can
993 stack instead of switching to a new
994 in the end of an hardirq.
995 This spares a stack switch and impro
996 processing.
997
998 config HAVE_SOFTIRQ_ON_OWN_STACK
999 bool
1000 help
1001 Architecture provides a function to
1002 separate stack.
1003
1004 config SOFTIRQ_ON_OWN_STACK
1005 def_bool HAVE_SOFTIRQ_ON_OWN_STACK &&
1006
1007 config ALTERNATE_USER_ADDRESS_SPACE
1008 bool
1009 help
1010 Architectures set this when the CPU
1011 spaces for kernel and user space po
1012 access_ok() check on a __user point
1013
1014 config PGTABLE_LEVELS
1015 int
1016 default 2
1017
1018 config ARCH_HAS_ELF_RANDOMIZE
1019 bool
1020 help
1021 An architecture supports choosing r
1022 stack, mmap, brk, and ET_DYN. Defin
1023 - arch_mmap_rnd()
1024 - arch_randomize_brk()
1025
1026 config HAVE_ARCH_MMAP_RND_BITS
1027 bool
1028 help
1029 An arch should select this symbol i
1030 number of bits for use in establish
1031 allocations, has MMU enabled and pr
1032 - ARCH_MMAP_RND_BITS_MIN
1033 - ARCH_MMAP_RND_BITS_MAX
1034
1035 config HAVE_EXIT_THREAD
1036 bool
1037 help
1038 An architecture implements exit_thr
1039
1040 config ARCH_MMAP_RND_BITS_MIN
1041 int
1042
1043 config ARCH_MMAP_RND_BITS_MAX
1044 int
1045
1046 config ARCH_MMAP_RND_BITS_DEFAULT
1047 int
1048
1049 config ARCH_MMAP_RND_BITS
1050 int "Number of bits to use for ASLR o
1051 range ARCH_MMAP_RND_BITS_MIN ARCH_MMA
1052 default ARCH_MMAP_RND_BITS_DEFAULT if
1053 default ARCH_MMAP_RND_BITS_MIN
1054 depends on HAVE_ARCH_MMAP_RND_BITS
1055 help
1056 This value can be used to select th
1057 determine the random offset to the
1058 resulting from mmap allocations. Th
1059 by the architecture's minimum and m
1060
1061 This value can be changed after boo
1062 /proc/sys/vm/mmap_rnd_bits tunable
1063
1064 config HAVE_ARCH_MMAP_RND_COMPAT_BITS
1065 bool
1066 help
1067 An arch should select this symbol i
1068 in compatibility mode, supports set
1069 use in establishing the base addres
1070 enabled and provides values for bot
1071 - ARCH_MMAP_RND_COMPAT_BITS_MIN
1072 - ARCH_MMAP_RND_COMPAT_BITS_MAX
1073
1074 config ARCH_MMAP_RND_COMPAT_BITS_MIN
1075 int
1076
1077 config ARCH_MMAP_RND_COMPAT_BITS_MAX
1078 int
1079
1080 config ARCH_MMAP_RND_COMPAT_BITS_DEFAULT
1081 int
1082
1083 config ARCH_MMAP_RND_COMPAT_BITS
1084 int "Number of bits to use for ASLR o
1085 range ARCH_MMAP_RND_COMPAT_BITS_MIN A
1086 default ARCH_MMAP_RND_COMPAT_BITS_DEF
1087 default ARCH_MMAP_RND_COMPAT_BITS_MIN
1088 depends on HAVE_ARCH_MMAP_RND_COMPAT_
1089 help
1090 This value can be used to select th
1091 determine the random offset to the
1092 resulting from mmap allocations for
1093 value will be bounded by the archit
1094 supported values.
1095
1096 This value can be changed after boo
1097 /proc/sys/vm/mmap_rnd_compat_bits t
1098
1099 config HAVE_ARCH_COMPAT_MMAP_BASES
1100 bool
1101 help
1102 This allows 64bit applications to i
1103 and vice-versa 32-bit applications
1104 Required for applications doing dif
1105
1106 config HAVE_PAGE_SIZE_4KB
1107 bool
1108
1109 config HAVE_PAGE_SIZE_8KB
1110 bool
1111
1112 config HAVE_PAGE_SIZE_16KB
1113 bool
1114
1115 config HAVE_PAGE_SIZE_32KB
1116 bool
1117
1118 config HAVE_PAGE_SIZE_64KB
1119 bool
1120
1121 config HAVE_PAGE_SIZE_256KB
1122 bool
1123
1124 choice
1125 prompt "MMU page size"
1126
1127 config PAGE_SIZE_4KB
1128 bool "4KiB pages"
1129 depends on HAVE_PAGE_SIZE_4KB
1130 help
1131 This option select the standard 4Ki
1132 available option on many architectu
1133 minimize memory consumption and is
1134 memory systems.
1135 Some software that is written for x
1136 assumptions about the page size and
1137
1138 config PAGE_SIZE_8KB
1139 bool "8KiB pages"
1140 depends on HAVE_PAGE_SIZE_8KB
1141 help
1142 This option is the only supported p
1143 processors, and can be slightly fas
1144
1145 config PAGE_SIZE_16KB
1146 bool "16KiB pages"
1147 depends on HAVE_PAGE_SIZE_16KB
1148 help
1149 This option is usually a good compr
1150 consumption and performance for typ
1151 workloads, often saving a level of
1152 to 4KB pages as well as reducing TL
1153 per-page operations in the kernel a
1154 page cache.
1155
1156 config PAGE_SIZE_32KB
1157 bool "32KiB pages"
1158 depends on HAVE_PAGE_SIZE_32KB
1159 help
1160 Using 32KiB page size will result i
1161 kernel at the price of higher memor
1162 16KiB pages. This option is availa
1163 Note that you will need a suitable
1164 support this.
1165
1166 config PAGE_SIZE_64KB
1167 bool "64KiB pages"
1168 depends on HAVE_PAGE_SIZE_64KB
1169 help
1170 Using 64KiB page size will result i
1171 kernel at the price of much higher
1172 4KiB or 16KiB pages.
1173 This is not suitable for general-pu
1174 better performance may be worth the
1175 supercomputing or database applicat
1176 large in-memory data rather than sm
1177
1178 config PAGE_SIZE_256KB
1179 bool "256KiB pages"
1180 depends on HAVE_PAGE_SIZE_256KB
1181 help
1182 256KiB pages have little practical
1183 memory usage. The kernel will only
1184 that have been compiled with '-zmax
1185 (the default is 64KiB or 4KiB on mo
1186
1187 endchoice
1188
1189 config PAGE_SIZE_LESS_THAN_64KB
1190 def_bool y
1191 depends on !PAGE_SIZE_64KB
1192 depends on PAGE_SIZE_LESS_THAN_256KB
1193
1194 config PAGE_SIZE_LESS_THAN_256KB
1195 def_bool y
1196 depends on !PAGE_SIZE_256KB
1197
1198 config PAGE_SHIFT
1199 int
1200 default 12 if PAGE_SIZE_4KB
1201 default 13 if PAGE_SIZE_8KB
1202 default 14 if PAGE_SIZE_16KB
1203 default 15 if PAGE_SIZE_32KB
1204 default 16 if PAGE_SIZE_64KB
1205 default 18 if PAGE_SIZE_256KB
1206
1207 # This allows to use a set of generic functio
1208 # address by giving priority to top-down sche
1209 # is not in legacy mode (compat task, unlimit
1210 # sysctl_legacy_va_layout).
1211 # Architecture that selects this option can p
1212 # - STACK_RND_MASK
1213 config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
1214 bool
1215 depends on MMU
1216 select ARCH_HAS_ELF_RANDOMIZE
1217
1218 config HAVE_OBJTOOL
1219 bool
1220
1221 config HAVE_JUMP_LABEL_HACK
1222 bool
1223
1224 config HAVE_NOINSTR_HACK
1225 bool
1226
1227 config HAVE_NOINSTR_VALIDATION
1228 bool
1229
1230 config HAVE_UACCESS_VALIDATION
1231 bool
1232 select OBJTOOL
1233
1234 config HAVE_STACK_VALIDATION
1235 bool
1236 help
1237 Architecture supports objtool compi
1238 validation.
1239
1240 config HAVE_RELIABLE_STACKTRACE
1241 bool
1242 help
1243 Architecture has either save_stack_
1244 arch_stack_walk_reliable() function
1245 if it can guarantee the trace is re
1246
1247 config HAVE_ARCH_HASH
1248 bool
1249 default n
1250 help
1251 If this is set, the architecture pr
1252 file which provides platform-specif
1253 functions in <linux/hash.h> or fs/n
1254
1255 config HAVE_ARCH_NVRAM_OPS
1256 bool
1257
1258 config ISA_BUS_API
1259 def_bool ISA
1260
1261 #
1262 # ABI hall of shame
1263 #
1264 config CLONE_BACKWARDS
1265 bool
1266 help
1267 Architecture has tls passed as the
1268 not the 5th one.
1269
1270 config CLONE_BACKWARDS2
1271 bool
1272 help
1273 Architecture has the first two argu
1274
1275 config CLONE_BACKWARDS3
1276 bool
1277 help
1278 Architecture has tls passed as the
1279 not the 5th one.
1280
1281 config ODD_RT_SIGACTION
1282 bool
1283 help
1284 Architecture has unusual rt_sigacti
1285
1286 config OLD_SIGSUSPEND
1287 bool
1288 help
1289 Architecture has old sigsuspend(2)
1290
1291 config OLD_SIGSUSPEND3
1292 bool
1293 help
1294 Even weirder antique ABI - three-ar
1295
1296 config OLD_SIGACTION
1297 bool
1298 help
1299 Architecture has old sigaction(2) s
1300 as OLD_SIGSUSPEND | OLD_SIGSUSPEND3
1301 but fairly different variant of sig
1302 compatibility...
1303
1304 config COMPAT_OLD_SIGACTION
1305 bool
1306
1307 config COMPAT_32BIT_TIME
1308 bool "Provide system calls for 32-bit
1309 default !64BIT || COMPAT
1310 help
1311 This enables 32 bit time_t support
1312 This is relevant on all 32-bit arch
1313 as part of compat syscall handling.
1314
1315 config ARCH_NO_PREEMPT
1316 bool
1317
1318 config ARCH_SUPPORTS_RT
1319 bool
1320
1321 config CPU_NO_EFFICIENT_FFS
1322 def_bool n
1323
1324 config HAVE_ARCH_VMAP_STACK
1325 def_bool n
1326 help
1327 An arch should select this symbol i
1328 in vmalloc space. This means:
1329
1330 - vmalloc space must be large enoug
1331 This may rule out many 32-bit arc
1332
1333 - Stacks in vmalloc space need to w
1334 vmap page tables are created on d
1335 needs to work while the stack poi
1336 unpopulated page tables or arch c
1337 most likely) needs to ensure that
1338 are populated before running on a
1339
1340 - If the stack overflows into a gua
1341 should happen. The definition of
1342 instantly rebooting without loggi
1343
1344 config VMAP_STACK
1345 default y
1346 bool "Use a virtually-mapped stack"
1347 depends on HAVE_ARCH_VMAP_STACK
1348 depends on !KASAN || KASAN_HW_TAGS ||
1349 help
1350 Enable this if you want the use vir
1351 with guard pages. This causes kern
1352 caught immediately rather than caus
1353 corruption.
1354
1355 To use this with software KASAN mod
1356 backing virtual mappings with real
1357 must be enabled.
1358
1359 config HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
1360 def_bool n
1361 help
1362 An arch should select this symbol i
1363 offset randomization with calls to
1364 during syscall entry and choose_ran
1365 syscall exit. Careful removal of -f
1366 -fstack-protector should also be ap
1367 closely examined, as the artificial
1368 to the compiler, so it will attempt
1369 of the static branch state.
1370
1371 config RANDOMIZE_KSTACK_OFFSET
1372 bool "Support for randomizing kernel
1373 default y
1374 depends on HAVE_ARCH_RANDOMIZE_KSTACK
1375 depends on INIT_STACK_NONE || !CC_IS_
1376 help
1377 The kernel stack offset can be rand
1378 roughly 5 bits of entropy, frustrat
1379 attacks that depend on stack addres
1380 cross-syscall address exposures.
1381
1382 The feature is controlled via the "
1383 kernel boot param, and if turned of
1384 of static branches (see JUMP_LABEL)
1385
1386 If unsure, say Y.
1387
1388 config RANDOMIZE_KSTACK_OFFSET_DEFAULT
1389 bool "Default state of kernel stack o
1390 depends on RANDOMIZE_KSTACK_OFFSET
1391 help
1392 Kernel stack offset randomization i
1393 "randomize_kstack_offset=on/off", a
1394 boot state.
1395
1396 config ARCH_OPTIONAL_KERNEL_RWX
1397 def_bool n
1398
1399 config ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
1400 def_bool n
1401
1402 config ARCH_HAS_STRICT_KERNEL_RWX
1403 def_bool n
1404
1405 config STRICT_KERNEL_RWX
1406 bool "Make kernel text and rodata rea
1407 depends on ARCH_HAS_STRICT_KERNEL_RWX
1408 default !ARCH_OPTIONAL_KERNEL_RWX ||
1409 help
1410 If this is set, kernel text and rod
1411 and non-text memory will be made no
1412 protection against certain security
1413 or modifying text)
1414
1415 These features are considered stand
1416 You should say Y here in almost all
1417
1418 config ARCH_HAS_STRICT_MODULE_RWX
1419 def_bool n
1420
1421 config STRICT_MODULE_RWX
1422 bool "Set loadable kernel module data
1423 depends on ARCH_HAS_STRICT_MODULE_RWX
1424 default !ARCH_OPTIONAL_KERNEL_RWX ||
1425 help
1426 If this is set, module text and rod
1427 and non-text memory will be made no
1428 protection against certain security
1429
1430 # select if the architecture provides an asm/
1431 config ARCH_HAS_PHYS_TO_DMA
1432 bool
1433
1434 config HAVE_ARCH_COMPILER_H
1435 bool
1436 help
1437 An architecture can select this if
1438 asm/compiler.h header that should b
1439 linux/compiler-*.h in order to over
1440 headers generally provide.
1441
1442 config HAVE_ARCH_PREL32_RELOCATIONS
1443 bool
1444 help
1445 May be selected by an architecture
1446 32-bit relocations, both in the too
1447 in which case relative references c
1448 for PCI fixup, initcalls etc which
1449 architectures, and don't require ru
1450 kernels.
1451
1452 config ARCH_USE_MEMREMAP_PROT
1453 bool
1454
1455 config LOCK_EVENT_COUNTS
1456 bool "Locking event counts collection
1457 depends on DEBUG_FS
1458 help
1459 Enable light-weight counting of var
1460 in the system with minimal performa
1461 the chance of application behavior
1462 differences. The counts are reporte
1463
1464 # Select if the architecture has support for
1465 config ARCH_HAS_RELR
1466 bool
1467
1468 config RELR
1469 bool "Use RELR relocation packing"
1470 depends on ARCH_HAS_RELR && TOOLS_SUP
1471 default y
1472 help
1473 Store the kernel's dynamic relocati
1474 format. Requires a compatible linke
1475 well as compatible NM and OBJCOPY u
1476 are compatible).
1477
1478 config ARCH_HAS_MEM_ENCRYPT
1479 bool
1480
1481 config ARCH_HAS_CC_PLATFORM
1482 bool
1483
1484 config HAVE_SPARSE_SYSCALL_NR
1485 bool
1486 help
1487 An architecture should select this
1488 to save space. For example, MIPS ar
1489 entries at 4000, 5000 and 6000 loca
1490 related optimizations for a given a
1491
1492 config ARCH_HAS_VDSO_DATA
1493 bool
1494
1495 config HAVE_STATIC_CALL
1496 bool
1497
1498 config HAVE_STATIC_CALL_INLINE
1499 bool
1500 depends on HAVE_STATIC_CALL
1501 select OBJTOOL
1502
1503 config HAVE_PREEMPT_DYNAMIC
1504 bool
1505
1506 config HAVE_PREEMPT_DYNAMIC_CALL
1507 bool
1508 depends on HAVE_STATIC_CALL
1509 select HAVE_PREEMPT_DYNAMIC
1510 help
1511 An architecture should select this
1512 model being selected at boot time u
1513
1514 Where an architecture selects HAVE_
1515 preemption function will be patched
1516
1517 Where an architecture does not sele
1518 call to a preemption function will
1519 trampoline will be patched.
1520
1521 It is strongly advised to support i
1522 overhead.
1523
1524 config HAVE_PREEMPT_DYNAMIC_KEY
1525 bool
1526 depends on HAVE_ARCH_JUMP_LABEL
1527 select HAVE_PREEMPT_DYNAMIC
1528 help
1529 An architecture should select this
1530 model being selected at boot time u
1531
1532 Each preemption function will be gi
1533 static key. This should have slight
1534 static calls, as this effectively i
1535 start of its callee. This may avoid
1536 integrate better with CFI schemes.
1537
1538 This will have greater overhead tha
1539 the call to the preemption function
1540
1541 config ARCH_WANT_LD_ORPHAN_WARN
1542 bool
1543 help
1544 An arch should select this symbol o
1545 included, size-asserted, or discard
1546 important because we never want exp
1547 by the linker, since the locations
1548 versions.
1549
1550 config HAVE_ARCH_PFN_VALID
1551 bool
1552
1553 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
1554 bool
1555
1556 config ARCH_SUPPORTS_PAGE_TABLE_CHECK
1557 bool
1558
1559 config ARCH_SPLIT_ARG64
1560 bool
1561 help
1562 If a 32-bit architecture requires 6
1563 pairs of 32-bit arguments, select t
1564
1565 config ARCH_HAS_ELFCORE_COMPAT
1566 bool
1567
1568 config ARCH_HAS_PARANOID_L1D_FLUSH
1569 bool
1570
1571 config ARCH_HAVE_TRACE_MMIO_ACCESS
1572 bool
1573
1574 config DYNAMIC_SIGFRAME
1575 bool
1576
1577 # Select, if arch has a named attribute group
1578 config HAVE_ARCH_NODE_DEV_GROUP
1579 bool
1580
1581 config ARCH_HAS_HW_PTE_YOUNG
1582 bool
1583 help
1584 Architectures that select this opti
1585 accessed bit in PTE entries when us
1586 translations. Architectures that re
1587 this option and override arch_has_h
1588
1589 config ARCH_HAS_NONLEAF_PMD_YOUNG
1590 bool
1591 help
1592 Architectures that select this opti
1593 accessed bit in non-leaf PMD entrie
1594 address translations. Page table wa
1595 may use this capability to reduce t
1596
1597 config ARCH_HAS_KERNEL_FPU_SUPPORT
1598 bool
1599 help
1600 Architectures that select this opti
1601 the kernel, as described in Documen
1602
1603 source "kernel/gcov/Kconfig"
1604
1605 source "scripts/gcc-plugins/Kconfig"
1606
1607 config FUNCTION_ALIGNMENT_4B
1608 bool
1609
1610 config FUNCTION_ALIGNMENT_8B
1611 bool
1612
1613 config FUNCTION_ALIGNMENT_16B
1614 bool
1615
1616 config FUNCTION_ALIGNMENT_32B
1617 bool
1618
1619 config FUNCTION_ALIGNMENT_64B
1620 bool
1621
1622 config FUNCTION_ALIGNMENT
1623 int
1624 default 64 if FUNCTION_ALIGNMENT_64B
1625 default 32 if FUNCTION_ALIGNMENT_32B
1626 default 16 if FUNCTION_ALIGNMENT_16B
1627 default 8 if FUNCTION_ALIGNMENT_8B
1628 default 4 if FUNCTION_ALIGNMENT_4B
1629 default 0
1630
1631 config CC_HAS_MIN_FUNCTION_ALIGNMENT
1632 # Detect availability of the GCC opti
1633 # guarantees minimal alignment for al
1634 # -falign-functions which the compile
1635 def_bool $(cc-option, -fmin-function-
1636
1637 config CC_HAS_SANE_FUNCTION_ALIGNMENT
1638 # Set if the guaranteed alignment wit
1639 # available or extra care is required
1640 # strict alignment always, even with
1641 def_bool CC_HAS_MIN_FUNCTION_ALIGNMEN
1642
1643 config ARCH_NEED_CMPXCHG_1_EMU
1644 bool
1645
1646 endmenu
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.