diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 2 | ||||
| -rw-r--r-- | lib/Kconfig.kasan | 43 |
2 files changed, 45 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 79a9bb67aeaf..ecb3516f6546 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -651,6 +651,8 @@ config DEBUG_STACKOVERFLOW source "lib/Kconfig.kmemcheck" +source "lib/Kconfig.kasan" + endmenu # "Memory Debugging" config DEBUG_SHIRQ diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan new file mode 100644 index 000000000000..e5b3fbe5560f --- /dev/null +++ b/lib/Kconfig.kasan @@ -0,0 +1,43 @@ +config HAVE_ARCH_KASAN + bool + +if HAVE_ARCH_KASAN + +config KASAN + bool "KASan: runtime memory debugger" + help + Enables kernel address sanitizer - runtime memory debugger, + designed to find out-of-bounds accesses and use-after-free bugs. + This is strictly debugging feature. It consumes about 1/8 + of available memory and brings about ~x3 performance slowdown. + For better error detection enable CONFIG_STACKTRACE, + and add slub_debug=U to boot cmdline. + +config KASAN_SHADOW_OFFSET + hex + +choice + prompt "Instrumentation type" + depends on KASAN + default KASAN_OUTLINE + +config KASAN_OUTLINE + bool "Outline instrumentation" + help + Before every memory access compiler insert function call + __asan_load*/__asan_store*. These functions performs check + of shadow memory. This is slower than inline instrumentation, + however it doesn't bloat size of kernel's .text section so + much as inline does. + +config KASAN_INLINE + bool "Inline instrumentation" + help + Compiler directly inserts code checking shadow memory before + memory accesses. This is faster than outline (in some workloads + it gives about x2 boost over outline instrumentation), but + make kernel's .text size much bigger. + +endchoice + +endif |