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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758/* SPDX-License-Identifier: GPL-2.0 *//* * GCC stack protector support. * * Stack protector works by putting a predefined pattern at the start of * the stack frame and verifying that it hasn't been overwritten when * returning from the function. The pattern is called the stack canary * and is a unique value for each task. */
#ifndef _ASM_STACKPROTECTOR_H#define _ASM_STACKPROTECTOR_H 1
#ifdef CONFIG_STACKPROTECTOR
#include <asm/tsc.h>#include <asm/processor.h>#include <asm/percpu.h>#include <asm/desc.h>
#include <linux/sched.h>
DECLARE_PER_CPU_CACHE_HOT(unsigned long, __stack_chk_guard);
/* * Initialize the stackprotector canary value. * * NOTE: this must only be called from functions that never return * and it must always be inlined. * * In addition, it should be called from a compilation unit for which * stack protector is disabled. Alternatively, the caller should not end * with a function call which gets tail-call optimized as that would * lead to checking a modified canary value. */static __always_inline void boot_init_stack_canary(void){ unsigned long canary = get_random_canary();
current->stack_canary = canary; this_cpu_write(__stack_chk_guard, canary);}
static inline void cpu_init_stack_canary(int cpu, struct task_struct *idle){ per_cpu(__stack_chk_guard, cpu) = idle->stack_canary;}
#else /* STACKPROTECTOR */
/* dummy boot_init_stack_canary() is defined in linux/stackprotector.h */
static inline void cpu_init_stack_canary(int cpu, struct task_struct *idle){ }
#endif /* STACKPROTECTOR */#endif /* _ASM_STACKPROTECTOR_H */