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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839/* SPDX-License-Identifier: GPL-2.0 *//* * GCC stack protector support. * * Stack protector works by putting 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 stack canary * and gcc expects it to be defined by a global variable called * "__stack_chk_guard" on ARM. This prevents SMP systems from using a * different value for each task unless we enable a GCC plugin that * replaces these symbol references with references to each task's own * value. */
#ifndef _ASM_STACKPROTECTOR_H#define _ASM_STACKPROTECTOR_H 1
#include <asm/thread_info.h>
extern 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. */static __always_inline void boot_init_stack_canary(void){ unsigned long canary = get_random_canary();
current->stack_canary = canary;#ifndef CONFIG_STACKPROTECTOR_PER_TASK __stack_chk_guard = current->stack_canary;#endif}
#endif /* _ASM_STACKPROTECTOR_H */