| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 3 | * Copyright (C) 2013 Richard Weinberger <richrd@nod.at> |
| 4 | */ |
| 5 | |
| 6 | #include <linux/uaccess.h> |
| 7 | #include <linux/kernel.h> |
| 8 | #include <os.h> |
| 9 | |
| 10 | bool copy_from_kernel_nofault_allowed(const void *src, size_t size) |
| 11 | { |
| 12 | void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE); |
| 13 | |
| 14 | if ((unsigned long)src < PAGE_SIZE || size <= 0) |
| 15 | return false; |
| 16 | if (os_mincore(psrc, size + src - psrc) <= 0) |
| 17 | return false; |
| 18 | return true; |
| 19 | } |
| 20 |