30 lines
705 B
C
30 lines
705 B
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_STACKPROTECTOR_H
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#define _ASM_STACKPROTECTOR_H 1
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#include <linux/random.h>
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#include <linux/version.h>
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extern unsigned long __stack_chk_guard;
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/*
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* Initialize the stackprotector canary value.
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*
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* NOTE: this must only be called from functions that never return,
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* and it must always be inlined.
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*/
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static __always_inline void boot_init_stack_canary(void)
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{
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unsigned long canary;
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/* Try to get a semi random initial value. */
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get_random_bytes(&canary, sizeof(canary));
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canary ^= LINUX_VERSION_CODE;
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canary &= CANARY_MASK;
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current->stack_canary = canary;
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__stack_chk_guard = current->stack_canary;
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}
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#endif /* __ASM_SH_STACKPROTECTOR_H */
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