Commit | Line | Data |
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0b24becc AR |
1 | config HAVE_ARCH_KASAN |
2 | bool | |
3 | ||
4 | if HAVE_ARCH_KASAN | |
5 | ||
6 | config KASAN | |
7 | bool "KASan: runtime memory debugger" | |
0316bec2 | 8 | depends on SLUB_DEBUG |
bebf56a1 | 9 | select CONSTRUCTORS |
0b24becc AR |
10 | help |
11 | Enables kernel address sanitizer - runtime memory debugger, | |
12 | designed to find out-of-bounds accesses and use-after-free bugs. | |
13 | This is strictly debugging feature. It consumes about 1/8 | |
14 | of available memory and brings about ~x3 performance slowdown. | |
15 | For better error detection enable CONFIG_STACKTRACE, | |
16 | and add slub_debug=U to boot cmdline. | |
17 | ||
18 | config KASAN_SHADOW_OFFSET | |
19 | hex | |
ef7f0d6a | 20 | default 0xdffffc0000000000 if X86_64 |
0b24becc AR |
21 | |
22 | choice | |
23 | prompt "Instrumentation type" | |
24 | depends on KASAN | |
25 | default KASAN_OUTLINE | |
26 | ||
27 | config KASAN_OUTLINE | |
28 | bool "Outline instrumentation" | |
29 | help | |
30 | Before every memory access compiler insert function call | |
31 | __asan_load*/__asan_store*. These functions performs check | |
32 | of shadow memory. This is slower than inline instrumentation, | |
33 | however it doesn't bloat size of kernel's .text section so | |
34 | much as inline does. | |
35 | ||
36 | config KASAN_INLINE | |
37 | bool "Inline instrumentation" | |
38 | help | |
39 | Compiler directly inserts code checking shadow memory before | |
40 | memory accesses. This is faster than outline (in some workloads | |
41 | it gives about x2 boost over outline instrumentation), but | |
42 | make kernel's .text size much bigger. | |
43 | ||
44 | endchoice | |
45 | ||
3f15801c AR |
46 | config TEST_KASAN |
47 | tristate "Module for testing kasan for bug detection" | |
48 | depends on m && KASAN | |
49 | help | |
50 | This is a test module doing various nasty things like | |
51 | out of bounds accesses, use after free. It is useful for testing | |
52 | kernel debugging features like kernel address sanitizer. | |
53 | ||
0b24becc | 54 | endif |