1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * GCC stack protector support. 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #ifndef _ASM_STACKPROTECTOR_H 8*4882a593Smuzhiyun #define _ASM_STACKPROTECTOR_H 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <linux/random.h> 11*4882a593Smuzhiyun #include <linux/version.h> 12*4882a593Smuzhiyun #include <asm/reg.h> 13*4882a593Smuzhiyun #include <asm/current.h> 14*4882a593Smuzhiyun #include <asm/paca.h> 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun /* 17*4882a593Smuzhiyun * Initialize the stackprotector canary value. 18*4882a593Smuzhiyun * 19*4882a593Smuzhiyun * NOTE: this must only be called from functions that never return, 20*4882a593Smuzhiyun * and it must always be inlined. 21*4882a593Smuzhiyun */ boot_init_stack_canary(void)22*4882a593Smuzhiyunstatic __always_inline void boot_init_stack_canary(void) 23*4882a593Smuzhiyun { 24*4882a593Smuzhiyun unsigned long canary; 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun /* Try to get a semi random initial value. */ 27*4882a593Smuzhiyun canary = get_random_canary(); 28*4882a593Smuzhiyun canary ^= mftb(); 29*4882a593Smuzhiyun canary ^= LINUX_VERSION_CODE; 30*4882a593Smuzhiyun canary &= CANARY_MASK; 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun current->stack_canary = canary; 33*4882a593Smuzhiyun #ifdef CONFIG_PPC64 34*4882a593Smuzhiyun get_paca()->canary = canary; 35*4882a593Smuzhiyun #endif 36*4882a593Smuzhiyun } 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun #endif /* _ASM_STACKPROTECTOR_H */ 39