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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334/* * GCC stack protector support. * * (This is directly adopted from the ARM implementation) * * 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 Xtensa. This unfortunately means that on SMP * we cannot have a different canary value per task. */
#ifndef _ASM_STACKPROTECTOR_H#define _ASM_STACKPROTECTOR_H 1
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; __stack_chk_guard = current->stack_canary;}
#endif /* _ASM_STACKPROTECTOR_H */