linux/arch/s390/Kconfig.debug
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   1menu "Kernel hacking"
   2
   3config TRACE_IRQFLAGS_SUPPORT
   4        def_bool y
   5
   6source "lib/Kconfig.debug"
   7
   8config STRICT_DEVMEM
   9        def_bool y
  10        prompt "Filter access to /dev/mem"
  11        ---help---
  12          This option restricts access to /dev/mem.  If this option is
  13          disabled, you allow userspace access to all memory, including
  14          kernel and userspace memory. Accidental memory access is likely
  15          to be disastrous.
  16          Memory access is required for experts who want to debug the kernel.
  17
  18          If you are unsure, say Y.
  19
  20config DEBUG_STRICT_USER_COPY_CHECKS
  21        def_bool n
  22        prompt "Strict user copy size checks"
  23        ---help---
  24          Enabling this option turns a certain set of sanity checks for user
  25          copy operations into compile time warnings.
  26
  27          The copy_from_user() etc checks are there to help test if there
  28          are sufficient security checks on the length argument of
  29          the copy operation, by having gcc prove that the argument is
  30          within bounds.
  31
  32          If unsure, or if you run an older (pre 4.4) gcc, say N.
  33
  34endmenu
  35