From 1d10eb2f156f5fc83cf6c7ce60441592e66eadb3 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 28 Nov 2014 16:39:25 -0500 Subject: [PATCH] crypto: switch af_alg_make_sg() to iov_iter 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 --- crypto/af_alg.c | 40 ++++++---------------- crypto/algif_hash.c | 45 ++++++++++--------------- crypto/algif_skcipher.c | 74 ++++++++++++++++++----------------------- include/crypto/if_alg.h | 3 +- 4 files changed, 62 insertions(+), 100 deletions(-) diff --git a/crypto/af_alg.c b/crypto/af_alg.c index 4665b79c729a..eb78fe8a60c8 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -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); diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c index 01f56eb7816e..01da360bdb55 100644 --- a/crypto/algif_hash.c +++ b/crypto/algif_hash.c @@ -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; diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c index c12207c8dde9..37110fd68adf 100644 --- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -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; diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h index cd62bf4289e9..88ea64e9a91c 100644 --- a/include/crypto/if_alg.h +++ b/include/crypto/if_alg.h @@ -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); -- 2.34.1