| Andrey Ryabinin | c6d3085 | 2016-01-20 15:00:55 -0800 | [diff] [blame] | 1 | config ARCH_HAS_UBSAN_SANITIZE_ALL |
| 2 | bool |
| 3 | |
| 4 | config UBSAN |
| 5 | bool "Undefined behaviour sanity checker" |
| 6 | help |
| 7 | This option enables undefined behaviour sanity checker |
| 8 | Compile-time instrumentation is used to detect various undefined |
| 9 | behaviours in runtime. Various types of checks may be enabled |
| 10 | via boot parameter ubsan_handle (see: Documentation/ubsan.txt). |
| 11 | |
| 12 | config UBSAN_SANITIZE_ALL |
| 13 | bool "Enable instrumentation for the entire kernel" |
| 14 | depends on UBSAN |
| 15 | depends on ARCH_HAS_UBSAN_SANITIZE_ALL |
| Andrey Ryabinin | dde5cf3 | 2016-03-22 14:27:45 -0700 | [diff] [blame] | 16 | |
| 17 | # We build with -Wno-maybe-uninitilzed, but we still want to |
| 18 | # use -Wmaybe-uninitilized in allmodconfig builds. |
| 19 | # So dependsy bellow used to disable this option in allmodconfig |
| 20 | depends on !COMPILE_TEST |
| Andrey Ryabinin | c6d3085 | 2016-01-20 15:00:55 -0800 | [diff] [blame] | 21 | default y |
| 22 | help |
| 23 | This option activates instrumentation for the entire kernel. |
| 24 | If you don't enable this option, you have to explicitly specify |
| 25 | UBSAN_SANITIZE := y for the files/directories you want to check for UB. |
| Yang Shi | 7707535 | 2016-02-11 16:12:55 -0800 | [diff] [blame] | 26 | Enabling this option will get kernel image size increased |
| 27 | significantly. |
| Andrey Ryabinin | c6d3085 | 2016-01-20 15:00:55 -0800 | [diff] [blame] | 28 | |
| 29 | config UBSAN_ALIGNMENT |
| 30 | bool "Enable checking of pointers alignment" |
| 31 | depends on UBSAN |
| 32 | default y if !HAVE_EFFICIENT_UNALIGNED_ACCESS |
| 33 | help |
| 34 | This option enables detection of unaligned memory accesses. |
| Yang Shi | 7707535 | 2016-02-11 16:12:55 -0800 | [diff] [blame] | 35 | Enabling this option on architectures that support unaligned |
| Andrey Ryabinin | c6d3085 | 2016-01-20 15:00:55 -0800 | [diff] [blame] | 36 | accesses may produce a lot of false positives. |