projects / linux-2.6-block.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" | |
| 03758dbb | 8 | depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB) |
| dd275caf | 9 | select SLUB_DEBUG if SLUB |
| bebf56a1 | 10 | select CONSTRUCTORS |
| 80a9201a | 11 | select STACKDEPOT |
| 0b24becc AR |
12 | help |
| 13 | Enables kernel address sanitizer - runtime memory debugger, | |
| 14 | designed to find out-of-bounds accesses and use-after-free bugs. | |
| 01e76903 JP |
15 | This is strictly a debugging feature and it requires a gcc version |
| 16 | of 4.9.2 or later. Detection of out of bounds accesses to stack or | |
| 17 | global variables requires gcc 5.0 or later. | |
| 18 | This feature consumes about 1/8 of available memory and brings about | |
| 19 | ~x3 performance slowdown. | |
| 89d3c87e | 20 | For better error detection enable CONFIG_STACKTRACE. |
| 7ed2f9e6 AP |
21 | Currently CONFIG_KASAN doesn't work with CONFIG_DEBUG_SLAB |
| 22 | (the resulting kernel does not boot). | |
| 0b24becc | 23 | |
| e7c52b84 AB |
24 | config KASAN_EXTRA |
| 25 | bool "KAsan: extra checks" | |
| 26 | depends on KASAN && DEBUG_KERNEL && !COMPILE_TEST | |
| 27 | help | |
| 28 | This enables further checks in the kernel address sanitizer, for now | |
| 29 | it only includes the address-use-after-scope check that can lead | |
| 30 | to excessive kernel stack usage, frame size warnings and longer | |
| 31 | compile time. | |
| 32 | https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 has more | |
| 33 | ||
| 34 | ||
| 0b24becc AR |
35 | choice |
| 36 | prompt "Instrumentation type" | |
| 37 | depends on KASAN | |
| 38 | default KASAN_OUTLINE | |
| 39 | ||
| 40 | config KASAN_OUTLINE | |
| 41 | bool "Outline instrumentation" | |
| 42 | help | |
| 43 | Before every memory access compiler insert function call | |
| 44 | __asan_load*/__asan_store*. These functions performs check | |
| 45 | of shadow memory. This is slower than inline instrumentation, | |
| 46 | however it doesn't bloat size of kernel's .text section so | |
| 47 | much as inline does. | |
| 48 | ||
| 49 | config KASAN_INLINE | |
| 50 | bool "Inline instrumentation" | |
| 51 | help | |
| 52 | Compiler directly inserts code checking shadow memory before | |
| 53 | memory accesses. This is faster than outline (in some workloads | |
| 54 | it gives about x2 boost over outline instrumentation), but | |
| 55 | make kernel's .text size much bigger. | |
| 01e76903 | 56 | This requires a gcc version of 5.0 or later. |
| 0b24becc AR |
57 | |
| 58 | endchoice | |
| 59 | ||
| 5dff0381 VG |
60 | config KASAN_S390_4_LEVEL_PAGING |
| 61 | bool "KASan: use 4-level paging" | |
| 62 | depends on KASAN && S390 | |
| 63 | help | |
| 64 | Compiling the kernel with KASan disables automatic 3-level vs | |
| 65 | 4-level paging selection. 3-level paging is used by default (up | |
| 66 | to 3TB of RAM with KASan enabled). This options allows to force | |
| 67 | 4-level paging instead. | |
| 68 | ||
| 3f15801c AR |
69 | config TEST_KASAN |
| 70 | tristate "Module for testing kasan for bug detection" | |
| 71 | depends on m && KASAN | |
| 72 | help | |
| 73 | This is a test module doing various nasty things like | |
| 74 | out of bounds accesses, use after free. It is useful for testing | |
| 75 | kernel debugging features like kernel address sanitizer. | |
| 76 | ||
| 0b24becc | 77 | endif |