1# SPDX-License-Identifier: GPL-2.0-only 2 3config PID_IN_CONTEXTIDR 4 bool "Write the current PID to the CONTEXTIDR register" 5 help 6 Enabling this option causes the kernel to write the current PID to 7 the CONTEXTIDR register, at the expense of some additional 8 instructions during context switch. Say Y here only if you are 9 planning to use hardware trace tools with this kernel. 10 11config ARM64_RANDOMIZE_TEXT_OFFSET 12 bool "Randomize TEXT_OFFSET at build time" 13 help 14 Say Y here if you want the image load offset (AKA TEXT_OFFSET) 15 of the kernel to be randomized at build-time. When selected, 16 this option will cause TEXT_OFFSET to be randomized upon any 17 build of the kernel, and the offset will be reflected in the 18 text_offset field of the resulting Image. This can be used to 19 fuzz-test bootloaders which respect text_offset. 20 21 This option is intended for bootloader and/or kernel testing 22 only. Bootloaders must make no assumptions regarding the value 23 of TEXT_OFFSET and platforms must not require a specific 24 value. 25 26config DEBUG_WX 27 bool "Warn on W+X mappings at boot" 28 select PTDUMP_CORE 29 ---help--- 30 Generate a warning if any W+X mappings are found at boot. 31 32 This is useful for discovering cases where the kernel is leaving 33 W+X mappings after applying NX, as such mappings are a security risk. 34 This check also includes UXN, which should be set on all kernel 35 mappings. 36 37 Look for a message in dmesg output like this: 38 39 arm64/mm: Checked W+X mappings: passed, no W+X pages found. 40 41 or like this, if the check failed: 42 43 arm64/mm: Checked W+X mappings: FAILED, <N> W+X pages found. 44 45 Note that even if the check fails, your kernel is possibly 46 still fine, as W+X mappings are not a security hole in 47 themselves, what they do is that they make the exploitation 48 of other unfixed kernel bugs easier. 49 50 There is no runtime or memory usage effect of this option 51 once the kernel has booted up - it's a one time check. 52 53 If in doubt, say "Y". 54 55config DEBUG_ALIGN_RODATA 56 depends on STRICT_KERNEL_RWX 57 bool "Align linker sections up to SECTION_SIZE" 58 help 59 If this option is enabled, sections that may potentially be marked as 60 read only or non-executable will be aligned up to the section size of 61 the kernel. This prevents sections from being split into pages and 62 avoids a potential TLB penalty. The downside is an increase in 63 alignment and potentially wasted space. Turn on this option if 64 performance is more important than memory pressure. 65 66 If in doubt, say N. 67 68config DEBUG_EFI 69 depends on EFI && DEBUG_INFO 70 bool "UEFI debugging" 71 help 72 Enable this option to include EFI specific debugging features into 73 the kernel that are only useful when using a debug build of the 74 UEFI firmware 75 76config ARM64_RELOC_TEST 77 depends on m 78 tristate "Relocation testing module" 79 80source "drivers/hwtracing/coresight/Kconfig" 81