18aa8bb12d
add the boot_init_stack_canary() and make the secondary idle threads use it. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
25 lines
687 B
C
25 lines
687 B
C
#ifndef _ASM_STACKPROTECTOR_H
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#define _ASM_STACKPROTECTOR_H 1
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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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/*
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* If we're the non-boot CPU, nothing set the PDA stack
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* canary up for us - and if we are the boot CPU we have
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* a 0 stack canary. This is a good place for updating
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* it, as we wont ever return from this function (so the
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* invalid canaries already on the stack wont ever
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* trigger):
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*/
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current->stack_canary = get_random_int();
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write_pda(stack_canary, current->stack_canary);
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}
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#endif
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