projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / blame
| Commit | Line | Data |
|---|---|---|
| 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" | |
| 80a9201a | 8 | depends on SLUB || (SLAB && !DEBUG_SLAB) |
| bebf56a1 | 9 | select CONSTRUCTORS |
| 80a9201a | 10 | select STACKDEPOT |
| 0b24becc AR |
11 | help |
| 12 | Enables kernel address sanitizer - runtime memory debugger, | |
| 13 | designed to find out-of-bounds accesses and use-after-free bugs. | |
| 01e76903 JP |
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. | |
| 89d3c87e | 19 | For better error detection enable CONFIG_STACKTRACE. |
| 7ed2f9e6 AP |
20 | Currently CONFIG_KASAN doesn't work with CONFIG_DEBUG_SLAB |
| 21 | (the resulting kernel does not boot). | |
| 0b24becc | 22 | |
| 062cd346 AB |
23 | config KASAN_EXTRA |
| 24 | bool "KAsan: extra checks" | |
| 25 | depends on KASAN && DEBUG_KERNEL && !COMPILE_TEST | |
| 26 | help | |
| 27 | This enables further checks in the kernel address sanitizer, for now | |
| 28 | it only includes the address-use-after-scope check that can lead | |
| 29 | to excessive kernel stack usage, frame size warnings and longer | |
| 30 | compile time. | |
| 31 | https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 has more | |
| 32 | ||
| 33 | ||
| 0b24becc AR |
34 | choice |
| 35 | prompt "Instrumentation type" | |
| 36 | depends on KASAN | |
| 37 | default KASAN_OUTLINE | |
| 38 | ||
| 39 | config KASAN_OUTLINE | |
| 40 | bool "Outline instrumentation" | |
| 41 | help | |
| 42 | Before every memory access compiler insert function call | |
| 43 | __asan_load*/__asan_store*. These functions performs check | |
| 44 | of shadow memory. This is slower than inline instrumentation, | |
| 45 | however it doesn't bloat size of kernel's .text section so | |
| 46 | much as inline does. | |
| 47 | ||
| 48 | config KASAN_INLINE | |
| 49 | bool "Inline instrumentation" | |
| 50 | help | |
| 51 | Compiler directly inserts code checking shadow memory before | |
| 52 | memory accesses. This is faster than outline (in some workloads | |
| 53 | it gives about x2 boost over outline instrumentation), but | |
| 54 | make kernel's .text size much bigger. | |
| 01e76903 | 55 | This requires a gcc version of 5.0 or later. |
| 0b24becc AR |
56 | |
| 57 | endchoice | |
| 58 | ||
| 3f15801c AR |
59 | config TEST_KASAN |
| 60 | tristate "Module for testing kasan for bug detection" | |
| 61 | depends on m && KASAN | |
| 62 | help | |
| 63 | This is a test module doing various nasty things like | |
| 64 | out of bounds accesses, use after free. It is useful for testing | |
| 65 | kernel debugging features like kernel address sanitizer. | |
| 66 | ||
| 0b24becc | 67 | endif |