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  >  / usr / src / linux-headers-3.13.0-24 / arch / mips / include / asm /
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Filename/usr/src/linux-headers-3.13.0-24/arch/mips/include/asm/stackprotector.h
Size1.11 kb
Permissionrw-r--r--
Ownerroot : root
Create time27-Apr-2025 09:50
Last modified20-Jan-2014 10:40
Last accessed06-Jul-2025 19:40
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/*
* 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 MIPS. This unfortunately means that on SMP
* we cannot have a different canary value per task.
*/

#ifndef _ASM_STACKPROTECTOR_H
#define _ASM_STACKPROTECTOR_H 1

#include <linux/random.h>
#include <linux/version.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;

/* Try to get a semi random initial value. */
get_random_bytes(&canary, sizeof(canary));
canary ^= LINUX_VERSION_CODE;

current->stack_canary = canary;
__stack_chk_guard = current->stack_canary;
}

#endif /* _ASM_STACKPROTECTOR_H */