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Linux/lib/Kconfig.kasan

  1 config HAVE_ARCH_KASAN
  2         bool
  3 
  4 if HAVE_ARCH_KASAN
  5 
  6 config KASAN
  7         bool "KASan: runtime memory debugger"
  8         depends on SLUB || (SLAB && !DEBUG_SLAB)
  9         select CONSTRUCTORS
 10         select STACKDEPOT
 11         help
 12           Enables kernel address sanitizer - runtime memory debugger,
 13           designed to find out-of-bounds accesses and use-after-free bugs.
 14           This is strictly a debugging feature and it requires a gcc version
 15           of 4.9.2 or later. Detection of out of bounds accesses to stack or
 16           global variables requires gcc 5.0 or later.
 17           This feature consumes about 1/8 of available memory and brings about
 18           ~x3 performance slowdown.
 19           For better error detection enable CONFIG_STACKTRACE.
 20           Currently CONFIG_KASAN doesn't work with CONFIG_DEBUG_SLAB
 21           (the resulting kernel does not boot).
 22 
 23 choice
 24         prompt "Instrumentation type"
 25         depends on KASAN
 26         default KASAN_OUTLINE
 27 
 28 config KASAN_OUTLINE
 29         bool "Outline instrumentation"
 30         help
 31           Before every memory access compiler insert function call
 32           __asan_load*/__asan_store*. These functions performs check
 33           of shadow memory. This is slower than inline instrumentation,
 34           however it doesn't bloat size of kernel's .text section so
 35           much as inline does.
 36 
 37 config KASAN_INLINE
 38         bool "Inline instrumentation"
 39         help
 40           Compiler directly inserts code checking shadow memory before
 41           memory accesses. This is faster than outline (in some workloads
 42           it gives about x2 boost over outline instrumentation), but
 43           make kernel's .text size much bigger.
 44           This requires a gcc version of 5.0 or later.
 45 
 46 endchoice
 47 
 48 config TEST_KASAN
 49         tristate "Module for testing kasan for bug detection"
 50         depends on m && KASAN
 51         help
 52           This is a test module doing various nasty things like
 53           out of bounds accesses, use after free. It is useful for testing
 54           kernel debugging features like kernel address sanitizer.
 55 
 56 endif

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