| menu "Kernel hacking" |
| |
| source "lib/Kconfig.debug" |
| |
| config ARM64_PTDUMP |
| bool "Export kernel pagetable layout to userspace via debugfs" |
| depends on DEBUG_KERNEL |
| select DEBUG_FS |
| help |
| Say Y here if you want to show the kernel pagetable layout in a |
| debugfs file. This information is only useful for kernel developers |
| who are working in architecture specific areas of the kernel. |
| It is probably not a good idea to enable this feature in a production |
| kernel. |
| |
| If in doubt, say N. |
| |
| config PID_IN_CONTEXTIDR |
| bool "Write the current PID to the CONTEXTIDR register" |
| help |
| Enabling this option causes the kernel to write the current PID to |
| the CONTEXTIDR register, at the expense of some additional |
| instructions during context switch. Say Y here only if you are |
| planning to use hardware trace tools with this kernel. |
| |
| config ARM64_RANDOMIZE_TEXT_OFFSET |
| bool "Randomize TEXT_OFFSET at build time" |
| help |
| Say Y here if you want the image load offset (AKA TEXT_OFFSET) |
| of the kernel to be randomized at build-time. When selected, |
| this option will cause TEXT_OFFSET to be randomized upon any |
| build of the kernel, and the offset will be reflected in the |
| text_offset field of the resulting Image. This can be used to |
| fuzz-test bootloaders which respect text_offset. |
| |
| This option is intended for bootloader and/or kernel testing |
| only. Bootloaders must make no assumptions regarding the value |
| of TEXT_OFFSET and platforms must not require a specific |
| value. |
| |
| config DEBUG_SET_MODULE_RONX |
| bool "Set loadable kernel module data as NX and text as RO" |
| depends on MODULES |
| default y |
| help |
| Is this is set, kernel module text and rodata will be made read-only. |
| This is to help catch accidental or malicious attempts to change the |
| kernel's executable code. |
| |
| If in doubt, say Y. |
| |
| config DEBUG_ALIGN_RODATA |
| depends on DEBUG_RODATA |
| bool "Align linker sections up to SECTION_SIZE" |
| help |
| If this option is enabled, sections that may potentially be marked as |
| read only or non-executable will be aligned up to the section size of |
| the kernel. This prevents sections from being split into pages and |
| avoids a potential TLB penalty. The downside is an increase in |
| alignment and potentially wasted space. Turn on this option if |
| performance is more important than memory pressure. |
| |
| If in doubt, say N. |
| |
| config ARM64_STRICT_BREAK_BEFORE_MAKE |
| bool "Enforce strict break-before-make on page table updates " |
| |
| source "drivers/hwtracing/coresight/Kconfig" |
| |
| endmenu |