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 long probe_kernel_read(void *dst, 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 -EFAULT; 16 17 if (os_mincore(psrc, size + src - psrc) <= 0) 18 return -EFAULT; 19 20 return __probe_kernel_read(dst, src, size); 21 } 22