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Linux/arch/arm64/Kconfig.debug

  1 menu "Kernel hacking"
  2 
  3 source "lib/Kconfig.debug"
  4 
  5 config 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 
 17 config 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 
 25 config 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 
 40 config 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 
 51 config 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 
 61 config 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 
 74 source "drivers/hwtracing/coresight/Kconfig"
 75 
 76 endmenu

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