Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <linux/uaccess.h>
2#include <linux/export.h>
3#include <linux/uio.h>
4
5/*
6 * Copy iovec to kernel. Returns -EFAULT on error.
7 *
8 * Note: this modifies the original iovec.
9 */
10
11int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len)
12{
13 while (len > 0) {
14 if (iov->iov_len) {
15 int copy = min_t(unsigned int, len, iov->iov_len);
16 if (copy_from_user(kdata, iov->iov_base, copy))
17 return -EFAULT;
18 len -= copy;
19 kdata += copy;
20 iov->iov_base += copy;
21 iov->iov_len -= copy;
22 }
23 iov++;
24 }
25
26 return 0;
27}
28EXPORT_SYMBOL(memcpy_fromiovec);
29
30/*
31 * Copy kernel to iovec. Returns -EFAULT on error.
32 *
33 * Note: this modifies the original iovec.
34 */
35
36int memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len)
37{
38 while (len > 0) {
39 if (iov->iov_len) {
40 int copy = min_t(unsigned int, iov->iov_len, len);
41 if (copy_to_user(iov->iov_base, kdata, copy))
42 return -EFAULT;
43 kdata += copy;
44 len -= copy;
45 iov->iov_len -= copy;
46 iov->iov_base += copy;
47 }
48 iov++;
49 }
50
51 return 0;
52}
53EXPORT_SYMBOL(memcpy_toiovec);