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Linux/arch/arm/include/asm/stackprotector.h

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  1 /*
  2  * GCC stack protector support.
  3  *
  4  * Stack protector works by putting predefined pattern at the start of
  5  * the stack frame and verifying that it hasn't been overwritten when
  6  * returning from the function.  The pattern is called stack canary
  7  * and gcc expects it to be defined by a global variable called
  8  * "__stack_chk_guard" on ARM.  This unfortunately means that on SMP
  9  * we cannot have a different canary value per task.
 10  */
 11 
 12 #ifndef _ASM_STACKPROTECTOR_H
 13 #define _ASM_STACKPROTECTOR_H 1
 14 
 15 #include <linux/random.h>
 16 #include <linux/version.h>
 17 
 18 extern unsigned long __stack_chk_guard;
 19 
 20 /*
 21  * Initialize the stackprotector canary value.
 22  *
 23  * NOTE: this must only be called from functions that never return,
 24  * and it must always be inlined.
 25  */
 26 static __always_inline void boot_init_stack_canary(void)
 27 {
 28         unsigned long canary;
 29 
 30         /* Try to get a semi random initial value. */
 31         get_random_bytes(&canary, sizeof(canary));
 32         canary ^= LINUX_VERSION_CODE;
 33 
 34         current->stack_canary = canary;
 35         __stack_chk_guard = current->stack_canary;
 36 }
 37 
 38 #endif  /* _ASM_STACKPROTECTOR_H */
 39 

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