Userspace/libs/libssp/ssp.c

#ifndef STACK_CHK_GUARD_VALUE
#if UINTPTR_MAX == UINT32_MAX
#define STACK_CHK_GUARD_VALUE 0xDEAD57AC
#else
#define STACK_CHK_GUARD_VALUE 0xDEAD57AC00000000
#endif
#endif

__UINTPTR_TYPE__ __stack_chk_guard = 0;

static void __attribute__((constructor, no_stack_protector)) __guard_setup(void)
{
    if (__stack_chk_guard == 0)
        __stack_chk_guard = STACK_CHK_GUARD_VALUE;
}

__attribute__((weak, noreturn, no_stack_protector)) void __stack_chk_fail(void)
{
    const char *msg = "Stack smashing detected";
    __asm__ __volatile__("syscall"
                         :
                         : "a"(0), "D"(0x57AC)
                         : "rcx", "r11", "memory");
}

__attribute__((weak, noreturn, no_stack_protector)) void __chk_fail(void)
{
    const char *msg = "Buffer overflow detected";
    __asm__ __volatile__("syscall"
                         :
                         : "a"(0), "D"(0xF700)
                         : "rcx", "r11", "memory");
}