SHADOW_STACK_ALLOC_SIZE
shdw_addr = my_syscall3(__NR_map_shadow_stack, NULL, SHADOW_STACK_ALLOC_SIZE, 0);
ret = munmap((void *)shdw_addr, SHADOW_STACK_ALLOC_SIZE);
shdw_addr = my_syscall3(__NR_map_shadow_stack, NULL, SHADOW_STACK_ALLOC_SIZE, 0);
ret = munmap(write_addr, SHADOW_STACK_ALLOC_SIZE);
shdw_addr = my_syscall3(__NR_map_shadow_stack, NULL, SHADOW_STACK_ALLOC_SIZE, 0);
if (shdw_addr && munmap(write_addr, SHADOW_STACK_ALLOC_SIZE)) {