| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * GCC stack protector support. |
| * |
| */ |
| |
| #ifndef _ASM_STACKPROTECTOR_H |
| #define _ASM_STACKPROTECTOR_H |
| |
| #include <linux/random.h> |
| #include <linux/version.h> |
| #include <asm/reg.h> |
| #include <asm/current.h> |
| #include <asm/paca.h> |
| |
| /* |
| * Initialize the stackprotector canary value. |
| * |
| * NOTE: this must only be called from functions that never return, |
| * and it must always be inlined. |
| */ |
| static __always_inline void boot_init_stack_canary(void) |
| { |
| unsigned long canary; |
| |
| /* Try to get a semi random initial value. */ |
| canary = get_random_canary(); |
| canary ^= mftb(); |
| canary ^= LINUX_VERSION_CODE; |
| canary &= CANARY_MASK; |
| |
| current->stack_canary = canary; |
| #ifdef CONFIG_PPC64 |
| get_paca()->canary = canary; |
| #endif |
| } |
| |
| #endif /* _ASM_STACKPROTECTOR_H */ |
