Kconfig.debug 2.48 KB
Newer Older
Catalin Marinas's avatar
Catalin Marinas committed
1 2 3 4 5 6 7 8
menu "Kernel hacking"

source "lib/Kconfig.debug"

	default y

9 10 11 12 13 14 15 16 17 18 19 20
config ARM64_PTDUMP
	bool "Export kernel pagetable layout to userspace via debugfs"
	depends on DEBUG_KERNEL
	select DEBUG_FS
	  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
	  If in doubt, say "N"

21 22 23 24 25 26 27 28 29 30 31 32 33 34
	bool "Filter access to /dev/mem"
	depends on MMU
	  If this option is disabled, you allow userspace (root) access to all
	  of memory, including kernel and userspace memory. Accidental
	  access to this is obviously disastrous, but specific access can
	  be used by people debugging the kernel.

	  If this option is switched on, the /dev/mem file only allows
	  userspace access to memory mapped peripherals.

	  If in doubt, say Y.

35 36 37 38 39 40 41 42
	bool "Write the current PID to the CONTEXTIDR register"
	  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.

43 44 45 46 47 48 49 50 51 52 53 54 55 56 57
	bool "Randomize TEXT_OFFSET at build time"
	  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

58 59 60 61 62 63 64 65 66 67 68
        bool "Set loadable kernel module data as NX and text as RO"
        depends on MODULES
          This option helps catch unintended modifications to loadable
          kernel module's text and read-only data. It also prevents execution
          of module data. Such protection may interfere with run-time code
          patching and dynamic kernel tracing - and they might also protect
          against certain classes of kernel exploits.
          If in doubt, say "N".

Catalin Marinas's avatar
Catalin Marinas committed