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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>
tirimbino
Al Viro 10 years ago
parent 31a25fae85
commit 1d10eb2f15
4 changed files with 62 additions and 100 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 40
      crypto/af_alg.c
  2. 45
      crypto/algif_hash.c
  3. 74
      crypto/algif_skcipher.c
  4. 3
      include/crypto/if_alg.h

40
crypto/af_alg.c
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@ -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;
err = -EFAULT;
if (!access_ok(write ? VERIFY_READ : VERIFY_WRITE, addr, len))
goto out;
off = from & ~PAGE_MASK;
npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (npages > ALG_MAX_PAGES)
npages = ALG_MAX_PAGES;
size_t off;
ssize_t n;
int npages, i;
err = get_user_pages_fast(from, npages, write, sgl->pages);
if (err < 0)
goto out;
n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
if (n < 0)
return n;
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);

45
crypto/algif_hash.c
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@ -41,8 +41,6 @@ static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;
unsigned long iovlen;
const struct iovec *iov;
long copied = 0;
int err;
@ -58,37 +56,28 @@ static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
ctx->more = 0;
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)) {
int len = iov_iter_count(&msg->msg_iter);
while (seglen) {
int len = min_t(unsigned long, seglen, limit);
int newlen;
if (len > limit)
len = limit;
newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
if (newlen < 0) {
err = copied ? 0 : newlen;
goto unlock;
}
ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
newlen);
err = af_alg_wait_for_completion(
crypto_ahash_update(&ctx->req),
&ctx->completion);
len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
if (len < 0) {
err = copied ? 0 : len;
goto unlock;
}
af_alg_free_sg(&ctx->sgl);
ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
if (err)
goto unlock;
err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
&ctx->completion);
af_alg_free_sg(&ctx->sgl);
if (err)
goto unlock;
seglen -= newlen;
from += newlen;
copied += newlen;
}
copied += len;
iov_iter_advance(&msg->msg_iter, len);
}
err = 0;

74
crypto/algif_skcipher.c
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@ -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 (seglen) {
sgl = list_first_entry(&ctx->tsgl,
struct skcipher_sg_list, list);
sg = sgl->sg;
while (!sg->length)
sg++;
if (!ctx->used) {
err = skcipher_wait_for_data(sk, flags);
if (err)
goto unlock;
}
while (iov_iter_count(&msg->msg_iter)) {
sgl = list_first_entry(&ctx->tsgl,
struct skcipher_sg_list, list);
sg = sgl->sg;
used = min_t(unsigned long, ctx->used, seglen);
while (!sg->length)
sg++;
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;
}
used = min_t(unsigned long, used, iov_iter_count(&msg->msg_iter));
used = af_alg_make_sg(&ctx->rsgl, &msg->msg_iter, used);
err = used;
if (err < 0)
goto unlock;
if (ctx->more || used < ctx->used)
used -= used % bs;
if (ctx->more || used < ctx->used)
used -= used % bs;
err = -EINVAL;
if (!used)
goto free;
err = -EINVAL;
if (!used)
goto free;
ablkcipher_request_set_crypt(&ctx->req, sg,
ctx->rsgl.sg, used,
ctx->iv);
ablkcipher_request_set_crypt(&ctx->req, sg,
ctx->rsgl.sg, used,
ctx->iv);
err = af_alg_wait_for_completion(
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;

3
include/crypto/if_alg.h
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@ -67,8 +67,7 @@ int af_alg_unregister_type(const struct af_alg_type *type);
int af_alg_release(struct socket *sock);
int af_alg_accept(struct sock *sk, struct socket *newsock);
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);
void af_alg_free_sg(struct af_alg_sgl *sgl);
int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);

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