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crypto: switch af_alg_make_sg() to iov_iter

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With that, all ->sendmsg() instances are converted to iov_iter primitives
and are agnostic wrt the kind of iov_iter they are working with.
So's the last remaining ->recvmsg() instance that wasn't kind-agnostic yet.
All ->sendmsg() and ->recvmsg() advance ->msg_iter by the amount actually
copied and none of them modifies the underlying iovec, etc.

Cc: linux-crypto@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2014-11-28 16:39:25 -05:00
parent 31a25fae85
commit 1d10eb2f15
4 changed files with 64 additions and 102 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crypto/af_alg.c
+11 -29
View File
@@ -338,49 +338,31 @@ static const struct net_proto_family alg_family = {
.owner = THIS_MODULE,
};
int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
int write)
int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
{
unsigned long from = (unsigned long)addr;
unsigned long npages;
unsigned off;
int err;
int i;
size_t off;
ssize_t n;
int npages, i;
err = -EFAULT;
if (!access_ok(write ? VERIFY_READ : VERIFY_WRITE, addr, len))
goto out;
n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
if (n < 0)
return n;
off = from & ~PAGE_MASK;
npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (npages > ALG_MAX_PAGES)
npages = ALG_MAX_PAGES;
err = get_user_pages_fast(from, npages, write, sgl->pages);
if (err < 0)
goto out;
npages = err;
err = -EINVAL;
npages = PAGE_ALIGN(off + n);
if (WARN_ON(npages == 0))
goto out;
err = 0;
return -EINVAL;
sg_init_table(sgl->sg, npages);
for (i = 0; i < npages; i++) {
for (i = 0, len = n; i < npages; i++) {
int plen = min_t(int, len, PAGE_SIZE - off);
sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
off = 0;
len -= plen;
err += plen;
}
out:
return err;
return n;
}
EXPORT_SYMBOL_GPL(af_alg_make_sg);