xref: /openbmc/linux/arch/riscv/include/asm/stackprotector.h (revision 7ae9fb1b7ecbb5d85d07857943f677fd1a559b18)
1f2c9699fSGuo Ren /* SPDX-License-Identifier: GPL-2.0 */
2f2c9699fSGuo Ren 
3f2c9699fSGuo Ren #ifndef _ASM_RISCV_STACKPROTECTOR_H
4f2c9699fSGuo Ren #define _ASM_RISCV_STACKPROTECTOR_H
5f2c9699fSGuo Ren 
6f2c9699fSGuo Ren extern unsigned long __stack_chk_guard;
7f2c9699fSGuo Ren 
8f2c9699fSGuo Ren /*
9f2c9699fSGuo Ren  * Initialize the stackprotector canary value.
10f2c9699fSGuo Ren  *
11f2c9699fSGuo Ren  * NOTE: this must only be called from functions that never return,
12f2c9699fSGuo Ren  * and it must always be inlined.
13f2c9699fSGuo Ren  */
boot_init_stack_canary(void)14f2c9699fSGuo Ren static __always_inline void boot_init_stack_canary(void)
15f2c9699fSGuo Ren {
16*622754e8SJason A. Donenfeld 	unsigned long canary = get_random_canary();
17f2c9699fSGuo Ren 
18f2c9699fSGuo Ren 	current->stack_canary = canary;
19fea2fed2SGuo Ren 	if (!IS_ENABLED(CONFIG_STACKPROTECTOR_PER_TASK))
20f2c9699fSGuo Ren 		__stack_chk_guard = current->stack_canary;
21f2c9699fSGuo Ren }
22f2c9699fSGuo Ren #endif /* _ASM_RISCV_STACKPROTECTOR_H */
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