18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * GCC stack protector support. 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci */ 68c2ecf20Sopenharmony_ci 78c2ecf20Sopenharmony_ci#ifndef _ASM_STACKPROTECTOR_H 88c2ecf20Sopenharmony_ci#define _ASM_STACKPROTECTOR_H 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci#include <linux/random.h> 118c2ecf20Sopenharmony_ci#include <linux/version.h> 128c2ecf20Sopenharmony_ci#include <asm/reg.h> 138c2ecf20Sopenharmony_ci#include <asm/current.h> 148c2ecf20Sopenharmony_ci#include <asm/paca.h> 158c2ecf20Sopenharmony_ci 168c2ecf20Sopenharmony_ci/* 178c2ecf20Sopenharmony_ci * Initialize the stackprotector canary value. 188c2ecf20Sopenharmony_ci * 198c2ecf20Sopenharmony_ci * NOTE: this must only be called from functions that never return, 208c2ecf20Sopenharmony_ci * and it must always be inlined. 218c2ecf20Sopenharmony_ci */ 228c2ecf20Sopenharmony_cistatic __always_inline void boot_init_stack_canary(void) 238c2ecf20Sopenharmony_ci{ 248c2ecf20Sopenharmony_ci unsigned long canary; 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ci /* Try to get a semi random initial value. */ 278c2ecf20Sopenharmony_ci canary = get_random_canary(); 288c2ecf20Sopenharmony_ci canary ^= mftb(); 298c2ecf20Sopenharmony_ci canary ^= LINUX_VERSION_CODE; 308c2ecf20Sopenharmony_ci canary &= CANARY_MASK; 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_ci current->stack_canary = canary; 338c2ecf20Sopenharmony_ci#ifdef CONFIG_PPC64 348c2ecf20Sopenharmony_ci get_paca()->canary = canary; 358c2ecf20Sopenharmony_ci#endif 368c2ecf20Sopenharmony_ci} 378c2ecf20Sopenharmony_ci 388c2ecf20Sopenharmony_ci#endif /* _ASM_STACKPROTECTOR_H */ 39