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 } 25