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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Pull crypto update from Herbert Xu: - The crypto API is now documented :) - Disallow arbitrary module loading through crypto API. - Allow get request with empty driver name through crypto_user. - Allow speed testing of arbitrary hash functions. - Add caam support for ctr(aes), gcm(aes) and their derivatives. - nx now supports concurrent hashing properly. - Add sahara support for SHA1/256. - Add ARM64 version of CRC32. - Misc fixes. * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (77 commits) crypto: tcrypt - Allow speed testing of arbitrary hash functions crypto: af_alg - add user space interface for AEAD crypto: qat - fix problem with coalescing enable logic crypto: sahara - add support for SHA1/256 crypto: sahara - replace tasklets with kthread crypto: sahara - add support for i.MX53 crypto: sahara - fix spinlock initialization crypto: arm - replace memset by memzero_explicit crypto: powerpc - replace memset by memzero_explicit crypto: sha - replace memset by memzero_explicit crypto: sparc - replace memset by memzero_explicit crypto: algif_skcipher - initialize upon init request crypto: algif_skcipher - removed unneeded code crypto: algif_skcipher - Fixed blocking recvmsg crypto: drbg - use memzero_explicit() for clearing sensitive data crypto: drbg - use MODULE_ALIAS_CRYPTO crypto: include crypto- module prefix in template crypto: user - add MODULE_ALIAS crypto: sha-mb - remove a bogus NULL check crytpo: qat - Fix 64 bytes requests ...
632 lines
13 KiB
C
632 lines
13 KiB
C
/*
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* algif_skcipher: User-space interface for skcipher algorithms
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*
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* This file provides the user-space API for symmetric key ciphers.
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*
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* Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/scatterwalk.h>
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#include <crypto/skcipher.h>
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#include <crypto/if_alg.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <net/sock.h>
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struct skcipher_sg_list {
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struct list_head list;
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int cur;
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struct scatterlist sg[0];
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};
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struct skcipher_ctx {
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struct list_head tsgl;
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struct af_alg_sgl rsgl;
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void *iv;
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struct af_alg_completion completion;
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unsigned used;
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unsigned int len;
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bool more;
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bool merge;
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bool enc;
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struct ablkcipher_request req;
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};
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#define MAX_SGL_ENTS ((4096 - sizeof(struct skcipher_sg_list)) / \
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sizeof(struct scatterlist) - 1)
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static inline int skcipher_sndbuf(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) -
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ctx->used, 0);
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}
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static inline bool skcipher_writable(struct sock *sk)
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{
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return PAGE_SIZE <= skcipher_sndbuf(sk);
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}
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static int skcipher_alloc_sgl(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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struct skcipher_sg_list *sgl;
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struct scatterlist *sg = NULL;
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sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
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if (!list_empty(&ctx->tsgl))
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sg = sgl->sg;
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if (!sg || sgl->cur >= MAX_SGL_ENTS) {
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sgl = sock_kmalloc(sk, sizeof(*sgl) +
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sizeof(sgl->sg[0]) * (MAX_SGL_ENTS + 1),
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GFP_KERNEL);
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if (!sgl)
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return -ENOMEM;
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sg_init_table(sgl->sg, MAX_SGL_ENTS + 1);
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sgl->cur = 0;
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if (sg)
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scatterwalk_sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg);
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list_add_tail(&sgl->list, &ctx->tsgl);
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}
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return 0;
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}
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static void skcipher_pull_sgl(struct sock *sk, int used)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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struct skcipher_sg_list *sgl;
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struct scatterlist *sg;
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int i;
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while (!list_empty(&ctx->tsgl)) {
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sgl = list_first_entry(&ctx->tsgl, struct skcipher_sg_list,
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list);
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sg = sgl->sg;
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for (i = 0; i < sgl->cur; i++) {
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int plen = min_t(int, used, sg[i].length);
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if (!sg_page(sg + i))
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continue;
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sg[i].length -= plen;
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sg[i].offset += plen;
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used -= plen;
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ctx->used -= plen;
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if (sg[i].length)
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return;
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put_page(sg_page(sg + i));
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sg_assign_page(sg + i, NULL);
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}
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list_del(&sgl->list);
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sock_kfree_s(sk, sgl,
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sizeof(*sgl) + sizeof(sgl->sg[0]) *
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(MAX_SGL_ENTS + 1));
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}
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if (!ctx->used)
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ctx->merge = 0;
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}
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static void skcipher_free_sgl(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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skcipher_pull_sgl(sk, ctx->used);
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}
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static int skcipher_wait_for_wmem(struct sock *sk, unsigned flags)
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{
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long timeout;
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DEFINE_WAIT(wait);
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int err = -ERESTARTSYS;
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if (flags & MSG_DONTWAIT)
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return -EAGAIN;
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set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
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for (;;) {
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if (signal_pending(current))
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break;
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prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
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timeout = MAX_SCHEDULE_TIMEOUT;
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if (sk_wait_event(sk, &timeout, skcipher_writable(sk))) {
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err = 0;
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break;
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}
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}
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finish_wait(sk_sleep(sk), &wait);
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return err;
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}
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static void skcipher_wmem_wakeup(struct sock *sk)
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{
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struct socket_wq *wq;
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if (!skcipher_writable(sk))
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return;
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rcu_read_lock();
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wq = rcu_dereference(sk->sk_wq);
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if (wq_has_sleeper(wq))
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wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
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POLLRDNORM |
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POLLRDBAND);
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sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
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rcu_read_unlock();
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}
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static int skcipher_wait_for_data(struct sock *sk, unsigned flags)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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long timeout;
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DEFINE_WAIT(wait);
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int err = -ERESTARTSYS;
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if (flags & MSG_DONTWAIT) {
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return -EAGAIN;
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}
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set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
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for (;;) {
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if (signal_pending(current))
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break;
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prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
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timeout = MAX_SCHEDULE_TIMEOUT;
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if (sk_wait_event(sk, &timeout, ctx->used)) {
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err = 0;
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break;
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}
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}
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finish_wait(sk_sleep(sk), &wait);
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clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
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return err;
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}
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static void skcipher_data_wakeup(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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struct socket_wq *wq;
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if (!ctx->used)
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return;
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rcu_read_lock();
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wq = rcu_dereference(sk->sk_wq);
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if (wq_has_sleeper(wq))
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wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
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POLLRDNORM |
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POLLRDBAND);
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sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
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rcu_read_unlock();
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}
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static int skcipher_sendmsg(struct kiocb *unused, struct socket *sock,
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struct msghdr *msg, size_t size)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req);
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unsigned ivsize = crypto_ablkcipher_ivsize(tfm);
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struct skcipher_sg_list *sgl;
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struct af_alg_control con = {};
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long copied = 0;
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bool enc = 0;
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bool init = 0;
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int err;
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int i;
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if (msg->msg_controllen) {
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err = af_alg_cmsg_send(msg, &con);
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if (err)
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return err;
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init = 1;
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switch (con.op) {
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case ALG_OP_ENCRYPT:
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enc = 1;
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break;
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case ALG_OP_DECRYPT:
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enc = 0;
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break;
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default:
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return -EINVAL;
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}
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if (con.iv && con.iv->ivlen != ivsize)
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return -EINVAL;
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}
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err = -EINVAL;
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lock_sock(sk);
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if (!ctx->more && ctx->used)
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goto unlock;
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if (init) {
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ctx->enc = enc;
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if (con.iv)
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memcpy(ctx->iv, con.iv->iv, ivsize);
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}
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while (size) {
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struct scatterlist *sg;
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unsigned long len = size;
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int plen;
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if (ctx->merge) {
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sgl = list_entry(ctx->tsgl.prev,
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struct skcipher_sg_list, list);
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sg = sgl->sg + sgl->cur - 1;
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len = min_t(unsigned long, len,
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PAGE_SIZE - sg->offset - sg->length);
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err = memcpy_from_msg(page_address(sg_page(sg)) +
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sg->offset + sg->length,
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msg, len);
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if (err)
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goto unlock;
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sg->length += len;
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ctx->merge = (sg->offset + sg->length) &
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(PAGE_SIZE - 1);
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ctx->used += len;
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copied += len;
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size -= len;
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continue;
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}
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if (!skcipher_writable(sk)) {
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err = skcipher_wait_for_wmem(sk, msg->msg_flags);
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if (err)
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goto unlock;
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}
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len = min_t(unsigned long, len, skcipher_sndbuf(sk));
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err = skcipher_alloc_sgl(sk);
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if (err)
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goto unlock;
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sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
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sg = sgl->sg;
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do {
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i = sgl->cur;
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plen = min_t(int, len, PAGE_SIZE);
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sg_assign_page(sg + i, alloc_page(GFP_KERNEL));
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err = -ENOMEM;
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if (!sg_page(sg + i))
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goto unlock;
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err = memcpy_from_msg(page_address(sg_page(sg + i)),
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msg, plen);
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if (err) {
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__free_page(sg_page(sg + i));
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sg_assign_page(sg + i, NULL);
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goto unlock;
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}
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sg[i].length = plen;
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len -= plen;
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ctx->used += plen;
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copied += plen;
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size -= plen;
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sgl->cur++;
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} while (len && sgl->cur < MAX_SGL_ENTS);
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ctx->merge = plen & (PAGE_SIZE - 1);
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}
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err = 0;
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ctx->more = msg->msg_flags & MSG_MORE;
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unlock:
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skcipher_data_wakeup(sk);
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release_sock(sk);
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return copied ?: err;
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}
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static ssize_t skcipher_sendpage(struct socket *sock, struct page *page,
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int offset, size_t size, int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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struct skcipher_sg_list *sgl;
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int err = -EINVAL;
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if (flags & MSG_SENDPAGE_NOTLAST)
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flags |= MSG_MORE;
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lock_sock(sk);
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if (!ctx->more && ctx->used)
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goto unlock;
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if (!size)
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goto done;
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if (!skcipher_writable(sk)) {
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err = skcipher_wait_for_wmem(sk, flags);
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if (err)
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goto unlock;
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}
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err = skcipher_alloc_sgl(sk);
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if (err)
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goto unlock;
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ctx->merge = 0;
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sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
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get_page(page);
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sg_set_page(sgl->sg + sgl->cur, page, size, offset);
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sgl->cur++;
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ctx->used += size;
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done:
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ctx->more = flags & MSG_MORE;
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unlock:
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skcipher_data_wakeup(sk);
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release_sock(sk);
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return err ?: size;
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}
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static int skcipher_recvmsg(struct kiocb *unused, struct socket *sock,
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struct msghdr *msg, size_t ignored, int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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unsigned bs = crypto_ablkcipher_blocksize(crypto_ablkcipher_reqtfm(
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&ctx->req));
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struct skcipher_sg_list *sgl;
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struct scatterlist *sg;
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unsigned long iovlen;
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const struct iovec *iov;
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int err = -EAGAIN;
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int used;
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long copied = 0;
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lock_sock(sk);
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for (iov = msg->msg_iter.iov, iovlen = msg->msg_iter.nr_segs; iovlen > 0;
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iovlen--, iov++) {
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unsigned long seglen = iov->iov_len;
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char __user *from = iov->iov_base;
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while (seglen) {
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sgl = list_first_entry(&ctx->tsgl,
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struct skcipher_sg_list, list);
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sg = sgl->sg;
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while (!sg->length)
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sg++;
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if (!ctx->used) {
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err = skcipher_wait_for_data(sk, flags);
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if (err)
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goto unlock;
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}
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used = min_t(unsigned long, ctx->used, seglen);
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used = af_alg_make_sg(&ctx->rsgl, from, used, 1);
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err = used;
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if (err < 0)
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goto unlock;
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if (ctx->more || used < ctx->used)
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used -= used % bs;
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err = -EINVAL;
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if (!used)
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goto free;
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ablkcipher_request_set_crypt(&ctx->req, sg,
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ctx->rsgl.sg, used,
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ctx->iv);
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err = af_alg_wait_for_completion(
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ctx->enc ?
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crypto_ablkcipher_encrypt(&ctx->req) :
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crypto_ablkcipher_decrypt(&ctx->req),
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&ctx->completion);
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free:
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af_alg_free_sg(&ctx->rsgl);
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if (err)
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goto unlock;
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copied += used;
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from += used;
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seglen -= used;
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skcipher_pull_sgl(sk, used);
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}
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}
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err = 0;
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unlock:
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skcipher_wmem_wakeup(sk);
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release_sock(sk);
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return copied ?: err;
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}
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|
|
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static unsigned int skcipher_poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct skcipher_ctx *ctx = ask->private;
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unsigned int mask;
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sock_poll_wait(file, sk_sleep(sk), wait);
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mask = 0;
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|
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if (ctx->used)
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mask |= POLLIN | POLLRDNORM;
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|
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if (skcipher_writable(sk))
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mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
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return mask;
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}
|
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|
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static struct proto_ops algif_skcipher_ops = {
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.family = PF_ALG,
|
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|
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.connect = sock_no_connect,
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.socketpair = sock_no_socketpair,
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.getname = sock_no_getname,
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.ioctl = sock_no_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.getsockopt = sock_no_getsockopt,
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.mmap = sock_no_mmap,
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.bind = sock_no_bind,
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.accept = sock_no_accept,
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.setsockopt = sock_no_setsockopt,
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|
|
.release = af_alg_release,
|
|
.sendmsg = skcipher_sendmsg,
|
|
.sendpage = skcipher_sendpage,
|
|
.recvmsg = skcipher_recvmsg,
|
|
.poll = skcipher_poll,
|
|
};
|
|
|
|
static void *skcipher_bind(const char *name, u32 type, u32 mask)
|
|
{
|
|
return crypto_alloc_ablkcipher(name, type, mask);
|
|
}
|
|
|
|
static void skcipher_release(void *private)
|
|
{
|
|
crypto_free_ablkcipher(private);
|
|
}
|
|
|
|
static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
|
|
{
|
|
return crypto_ablkcipher_setkey(private, key, keylen);
|
|
}
|
|
|
|
static void skcipher_sock_destruct(struct sock *sk)
|
|
{
|
|
struct alg_sock *ask = alg_sk(sk);
|
|
struct skcipher_ctx *ctx = ask->private;
|
|
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req);
|
|
|
|
skcipher_free_sgl(sk);
|
|
sock_kzfree_s(sk, ctx->iv, crypto_ablkcipher_ivsize(tfm));
|
|
sock_kfree_s(sk, ctx, ctx->len);
|
|
af_alg_release_parent(sk);
|
|
}
|
|
|
|
static int skcipher_accept_parent(void *private, struct sock *sk)
|
|
{
|
|
struct skcipher_ctx *ctx;
|
|
struct alg_sock *ask = alg_sk(sk);
|
|
unsigned int len = sizeof(*ctx) + crypto_ablkcipher_reqsize(private);
|
|
|
|
ctx = sock_kmalloc(sk, len, GFP_KERNEL);
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
|
|
ctx->iv = sock_kmalloc(sk, crypto_ablkcipher_ivsize(private),
|
|
GFP_KERNEL);
|
|
if (!ctx->iv) {
|
|
sock_kfree_s(sk, ctx, len);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
memset(ctx->iv, 0, crypto_ablkcipher_ivsize(private));
|
|
|
|
INIT_LIST_HEAD(&ctx->tsgl);
|
|
ctx->len = len;
|
|
ctx->used = 0;
|
|
ctx->more = 0;
|
|
ctx->merge = 0;
|
|
ctx->enc = 0;
|
|
af_alg_init_completion(&ctx->completion);
|
|
|
|
ask->private = ctx;
|
|
|
|
ablkcipher_request_set_tfm(&ctx->req, private);
|
|
ablkcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
|
|
af_alg_complete, &ctx->completion);
|
|
|
|
sk->sk_destruct = skcipher_sock_destruct;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct af_alg_type algif_type_skcipher = {
|
|
.bind = skcipher_bind,
|
|
.release = skcipher_release,
|
|
.setkey = skcipher_setkey,
|
|
.accept = skcipher_accept_parent,
|
|
.ops = &algif_skcipher_ops,
|
|
.name = "skcipher",
|
|
.owner = THIS_MODULE
|
|
};
|
|
|
|
static int __init algif_skcipher_init(void)
|
|
{
|
|
return af_alg_register_type(&algif_type_skcipher);
|
|
}
|
|
|
|
static void __exit algif_skcipher_exit(void)
|
|
{
|
|
int err = af_alg_unregister_type(&algif_type_skcipher);
|
|
BUG_ON(err);
|
|
}
|
|
|
|
module_init(algif_skcipher_init);
|
|
module_exit(algif_skcipher_exit);
|
|
MODULE_LICENSE("GPL");
|