1menu "Kernel hacking" 2 3source "lib/Kconfig.debug" 4 5config ARM64_PTDUMP 6 bool "Export kernel pagetable layout to userspace via debugfs" 7 depends on DEBUG_KERNEL 8 select DEBUG_FS 9 help 10 Say Y here if you want to show the kernel pagetable layout in a 11 debugfs file. This information is only useful for kernel developers 12 who are working in architecture specific areas of the kernel. 13 It is probably not a good idea to enable this feature in a production 14 kernel. 15 If in doubt, say "N" 16 17config PID_IN_CONTEXTIDR 18 bool "Write the current PID to the CONTEXTIDR register" 19 help 20 Enabling this option causes the kernel to write the current PID to 21 the CONTEXTIDR register, at the expense of some additional 22 instructions during context switch. Say Y here only if you are 23 planning to use hardware trace tools with this kernel. 24 25config ARM64_RANDOMIZE_TEXT_OFFSET 26 bool "Randomize TEXT_OFFSET at build time" 27 help 28 Say Y here if you want the image load offset (AKA TEXT_OFFSET) 29 of the kernel to be randomized at build-time. When selected, 30 this option will cause TEXT_OFFSET to be randomized upon any 31 build of the kernel, and the offset will be reflected in the 32 text_offset field of the resulting Image. This can be used to 33 fuzz-test bootloaders which respect text_offset. 34 35 This option is intended for bootloader and/or kernel testing 36 only. Bootloaders must make no assumptions regarding the value 37 of TEXT_OFFSET and platforms must not require a specific 38 value. 39 40config DEBUG_SET_MODULE_RONX 41 bool "Set loadable kernel module data as NX and text as RO" 42 depends on MODULES 43 help 44 This option helps catch unintended modifications to loadable 45 kernel module's text and read-only data. It also prevents execution 46 of module data. Such protection may interfere with run-time code 47 patching and dynamic kernel tracing - and they might also protect 48 against certain classes of kernel exploits. 49 If in doubt, say "N". 50 51config DEBUG_RODATA 52 bool "Make kernel text and rodata read-only" 53 default y 54 help 55 If this is set, kernel text and rodata will be made read-only. This 56 is to help catch accidental or malicious attempts to change the 57 kernel's executable code. 58 59 If in doubt, say Y 60 61config DEBUG_ALIGN_RODATA 62 depends on DEBUG_RODATA && ARM64_4K_PAGES 63 bool "Align linker sections up to SECTION_SIZE" 64 help 65 If this option is enabled, sections that may potentially be marked as 66 read only or non-executable will be aligned up to the section size of 67 the kernel. This prevents sections from being split into pages and 68 avoids a potential TLB penalty. The downside is an increase in 69 alignment and potentially wasted space. Turn on this option if 70 performance is more important than memory pressure. 71 72 If in doubt, say N 73 74source "drivers/hwtracing/coresight/Kconfig" 75 76endmenu 77