Linux Kernel  3.7.1
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stackprotector.h
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1 #ifndef __ASM_SH_STACKPROTECTOR_H
2 #define __ASM_SH_STACKPROTECTOR_H
3 
4 #include <linux/random.h>
5 #include <linux/version.h>
6 
7 extern unsigned long __stack_chk_guard;
8 
9 /*
10  * Initialize the stackprotector canary value.
11  *
12  * NOTE: this must only be called from functions that never return,
13  * and it must always be inlined.
14  */
15 static __always_inline void boot_init_stack_canary(void)
16 {
17  unsigned long canary;
18 
19  /* Try to get a semi random initial value. */
20  get_random_bytes(&canary, sizeof(canary));
21  canary ^= LINUX_VERSION_CODE;
22 
23  current->stack_canary = canary;
24  __stack_chk_guard = current->stack_canary;
25 }
26 
27 #endif /* __ASM_SH_STACKPROTECTOR_H */