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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

74
crypto/algif_skcipher.c
View File

@@ -426,67 +426,59 @@ static int skcipher_recvmsg(struct kiocb *unused, struct socket *sock,
&ctx->req));
struct skcipher_sg_list *sgl;
struct scatterlist *sg;
unsigned long iovlen;
const struct iovec *iov;
int err = -EAGAIN;
int used;
long copied = 0;
lock_sock(sk);
for (iov = msg->msg_iter.iov, iovlen = msg->msg_iter.nr_segs; iovlen > 0;
iovlen--, iov++) {
unsigned long seglen = iov->iov_len;
char __user *from = iov->iov_base;
while (iov_iter_count(&msg->msg_iter)) {
sgl = list_first_entry(&ctx->tsgl,
struct skcipher_sg_list, list);
sg = sgl->sg;
while (seglen) {
sgl = list_first_entry(&ctx->tsgl,
struct skcipher_sg_list, list);
sg = sgl->sg;
while (!sg->length)
sg++;
while (!sg->length)
sg++;
if (!ctx->used) {
err = skcipher_wait_for_data(sk, flags);
if (err)
goto unlock;
}
used = min_t(unsigned long, ctx->used, seglen);
used = af_alg_make_sg(&ctx->rsgl, from, used, 1);
err = used;
if (err < 0)
used = ctx->used;
if (!used) {
err = skcipher_wait_for_data(sk, flags);
if (err)
goto unlock;
}
if (ctx->more || used < ctx->used)
used -= used % bs;
used = min_t(unsigned long, used, iov_iter_count(&msg->msg_iter));
err = -EINVAL;
if (!used)
goto free;
used = af_alg_make_sg(&ctx->rsgl, &msg->msg_iter, used);
err = used;
if (err < 0)
goto unlock;
ablkcipher_request_set_crypt(&ctx->req, sg,
ctx->rsgl.sg, used,
ctx->iv);
if (ctx->more || used < ctx->used)
used -= used % bs;
err = af_alg_wait_for_completion(
err = -EINVAL;
if (!used)
goto free;
ablkcipher_request_set_crypt(&ctx->req, sg,
ctx->rsgl.sg, used,
ctx->iv);
err = af_alg_wait_for_completion(
ctx->enc ?
crypto_ablkcipher_encrypt(&ctx->req) :
crypto_ablkcipher_decrypt(&ctx->req),
&ctx->completion);
free:
af_alg_free_sg(&ctx->rsgl);
af_alg_free_sg(&ctx->rsgl);
if (err)
goto unlock;
if (err)
goto unlock;
copied += used;
from += used;
seglen -= used;
skcipher_pull_sgl(sk, used);
}
copied += used;
skcipher_pull_sgl(sk, used);
iov_iter_advance(&msg->msg_iter, used);
}
err = 0;