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Linux/arch/arm64/Kconfig.debug

  1 menu "Kernel hacking"
  2 
  3 source "lib/Kconfig.debug"
  4 
  5 config FRAME_POINTER
  6         bool
  7         default y
  8 
  9 config STRICT_DEVMEM
 10         bool "Filter access to /dev/mem"
 11         depends on MMU
 12         help
 13           If this option is disabled, you allow userspace (root) access to all
 14           of memory, including kernel and userspace memory. Accidental
 15           access to this is obviously disastrous, but specific access can
 16           be used by people debugging the kernel.
 17 
 18           If this option is switched on, the /dev/mem file only allows
 19           userspace access to memory mapped peripherals.
 20 
 21           If in doubt, say Y.
 22 
 23 config PID_IN_CONTEXTIDR
 24         bool "Write the current PID to the CONTEXTIDR register"
 25         help
 26           Enabling this option causes the kernel to write the current PID to
 27           the CONTEXTIDR register, at the expense of some additional
 28           instructions during context switch. Say Y here only if you are
 29           planning to use hardware trace tools with this kernel.
 30 
 31 config ARM64_RANDOMIZE_TEXT_OFFSET
 32         bool "Randomize TEXT_OFFSET at build time"
 33         help
 34           Say Y here if you want the image load offset (AKA TEXT_OFFSET)
 35           of the kernel to be randomized at build-time. When selected,
 36           this option will cause TEXT_OFFSET to be randomized upon any
 37           build of the kernel, and the offset will be reflected in the
 38           text_offset field of the resulting Image. This can be used to
 39           fuzz-test bootloaders which respect text_offset.
 40 
 41           This option is intended for bootloader and/or kernel testing
 42           only. Bootloaders must make no assumptions regarding the value
 43           of TEXT_OFFSET and platforms must not require a specific
 44           value.
 45 
 46 config DEBUG_SET_MODULE_RONX
 47         bool "Set loadable kernel module data as NX and text as RO"
 48         depends on MODULES
 49         help
 50           This option helps catch unintended modifications to loadable
 51           kernel module's text and read-only data. It also prevents execution
 52           of module data. Such protection may interfere with run-time code
 53           patching and dynamic kernel tracing - and they might also protect
 54           against certain classes of kernel exploits.
 55           If in doubt, say "N".
 56 
 57 endmenu

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