| Filippo Arcidiacono | 5d920bb | 2012-04-19 15:45:57 +0900 | [diff] [blame] | 1 | #ifndef __ASM_SH_STACKPROTECTOR_H |
| 2 | #define __ASM_SH_STACKPROTECTOR_H |
| 3 | |
| 4 | #include <linux/random.h> |
| 5 | #include <linux/version.h> |
| 6 | |
| 7 | extern unsigned long __stack_chk_guard; |
| 8 | |
| 9 | /* |
| 10 | * Initialize the stackprotector canary value. |
| 11 | * |
| 12 | * NOTE: this must only be called from functions that never return, |
| 13 | * and it must always be inlined. |
| 14 | */ |
| 15 | static __always_inline void boot_init_stack_canary(void) |
| 16 | { |
| 17 | unsigned long canary; |
| 18 | |
| 19 | /* Try to get a semi random initial value. */ |
| 20 | get_random_bytes(&canary, sizeof(canary)); |
| 21 | canary ^= LINUX_VERSION_CODE; |
| 22 | |
| 23 | current->stack_canary = canary; |
| 24 | __stack_chk_guard = current->stack_canary; |
| 25 | } |
| 26 | |
| 27 | #endif /* __ASM_SH_STACKPROTECTOR_H */ |