18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci 38c2ecf20Sopenharmony_ci#ifndef _ASM_RISCV_STACKPROTECTOR_H 48c2ecf20Sopenharmony_ci#define _ASM_RISCV_STACKPROTECTOR_H 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci#include <linux/random.h> 78c2ecf20Sopenharmony_ci#include <linux/version.h> 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ciextern unsigned long __stack_chk_guard; 108c2ecf20Sopenharmony_ci 118c2ecf20Sopenharmony_ci/* 128c2ecf20Sopenharmony_ci * Initialize the stackprotector canary value. 138c2ecf20Sopenharmony_ci * 148c2ecf20Sopenharmony_ci * NOTE: this must only be called from functions that never return, 158c2ecf20Sopenharmony_ci * and it must always be inlined. 168c2ecf20Sopenharmony_ci */ 178c2ecf20Sopenharmony_cistatic __always_inline void boot_init_stack_canary(void) 188c2ecf20Sopenharmony_ci{ 198c2ecf20Sopenharmony_ci unsigned long canary; 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_ci /* Try to get a semi random initial value. */ 228c2ecf20Sopenharmony_ci get_random_bytes(&canary, sizeof(canary)); 238c2ecf20Sopenharmony_ci canary ^= LINUX_VERSION_CODE; 248c2ecf20Sopenharmony_ci canary &= CANARY_MASK; 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ci current->stack_canary = canary; 278c2ecf20Sopenharmony_ci __stack_chk_guard = current->stack_canary; 288c2ecf20Sopenharmony_ci} 298c2ecf20Sopenharmony_ci#endif /* _ASM_RISCV_STACKPROTECTOR_H */ 30