2018-09-27 15:05:53 +08:00
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* GCC stack protector support.
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*
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*/
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#ifndef _ASM_STACKPROTECTOR_H
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#define _ASM_STACKPROTECTOR_H
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#include <linux/random.h>
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#include <linux/version.h>
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#include <asm/reg.h>
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#include <asm/current.h>
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2018-09-27 15:05:55 +08:00
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#include <asm/paca.h>
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2018-09-27 15:05:53 +08:00
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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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canary = get_random_canary();
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canary ^= mftb();
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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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2018-09-27 15:05:55 +08:00
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#ifdef CONFIG_PPC64
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get_paca()->canary = canary;
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#endif
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2018-09-27 15:05:53 +08:00
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}
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#endif /* _ASM_STACKPROTECTOR_H */
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