| Richard Weinberger | f75b1b1 | 2013-08-17 18:46:00 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 Richard Weinberger <richrd@nod.at> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/uaccess.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <os.h> |
| 12 | |
| 13 | long probe_kernel_read(void *dst, const void *src, size_t size) |
| 14 | { |
| 15 | void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE); |
| 16 | |
| 17 | if ((unsigned long)src < PAGE_SIZE || size <= 0) |
| 18 | return -EFAULT; |
| 19 | |
| 20 | if (os_mincore(psrc, size + src - psrc) <= 0) |
| 21 | return -EFAULT; |
| 22 | |
| 23 | return __probe_kernel_read(dst, src, size); |
| 24 | } |
