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38 lines
788 B
38 lines
788 B
/* 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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#include <asm/paca.h> |
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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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#ifdef CONFIG_PPC64 |
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get_paca()->canary = canary; |
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#endif |
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} |
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#endif /* _ASM_STACKPROTECTOR_H */
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