linux/arch/riscv/include/asm/stackprotector.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2
   3#ifndef _ASM_RISCV_STACKPROTECTOR_H
   4#define _ASM_RISCV_STACKPROTECTOR_H
   5
   6#include <linux/random.h>
   7#include <linux/version.h>
   8
   9extern unsigned long __stack_chk_guard;
  10
  11/*
  12 * Initialize the stackprotector canary value.
  13 *
  14 * NOTE: this must only be called from functions that never return,
  15 * and it must always be inlined.
  16 */
  17static __always_inline void boot_init_stack_canary(void)
  18{
  19        unsigned long canary;
  20
  21        /* Try to get a semi random initial value. */
  22        get_random_bytes(&canary, sizeof(canary));
  23        canary ^= LINUX_VERSION_CODE;
  24        canary &= CANARY_MASK;
  25
  26        current->stack_canary = canary;
  27        if (!IS_ENABLED(CONFIG_STACKPROTECTOR_PER_TASK))
  28                __stack_chk_guard = current->stack_canary;
  29}
  30#endif /* _ASM_RISCV_STACKPROTECTOR_H */
  31