linux/crypto/algif_skcipher.c
Linus Torvalds 8513342170 Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto fix from Herbert Xu:
 "This fixes a bug in the algif_skcipher interface that can trigger a
  kernel WARN_ON from user-space.  It does so by using the new skcipher
  interface which unlike the previous ablkcipher does not need to create
  extra geniv objects which is what was used to trigger the WARN_ON"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: algif_skcipher - Use new skcipher interface
2015-12-28 10:44:41 -08:00

854 lines
18 KiB
C

/*
* algif_skcipher: User-space interface for skcipher algorithms
*
* This file provides the user-space API for symmetric key ciphers.
*
* Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#include <crypto/scatterwalk.h>
#include <crypto/skcipher.h>
#include <crypto/if_alg.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/net.h>
#include <net/sock.h>
struct skcipher_sg_list {
struct list_head list;
int cur;
struct scatterlist sg[0];
};
struct skcipher_ctx {
struct list_head tsgl;
struct af_alg_sgl rsgl;
void *iv;
struct af_alg_completion completion;
atomic_t inflight;
unsigned used;
unsigned int len;
bool more;
bool merge;
bool enc;
struct skcipher_request req;
};
struct skcipher_async_rsgl {
struct af_alg_sgl sgl;
struct list_head list;
};
struct skcipher_async_req {
struct kiocb *iocb;
struct skcipher_async_rsgl first_sgl;
struct list_head list;
struct scatterlist *tsg;
char iv[];
};
#define GET_SREQ(areq, ctx) (struct skcipher_async_req *)((char *)areq + \
crypto_skcipher_reqsize(crypto_skcipher_reqtfm(&ctx->req)))
#define GET_REQ_SIZE(ctx) \
crypto_skcipher_reqsize(crypto_skcipher_reqtfm(&ctx->req))
#define GET_IV_SIZE(ctx) \
crypto_skcipher_ivsize(crypto_skcipher_reqtfm(&ctx->req))
#define MAX_SGL_ENTS ((4096 - sizeof(struct skcipher_sg_list)) / \
sizeof(struct scatterlist) - 1)
static void skcipher_free_async_sgls(struct skcipher_async_req *sreq)
{
struct skcipher_async_rsgl *rsgl, *tmp;
struct scatterlist *sgl;
struct scatterlist *sg;
int i, n;
list_for_each_entry_safe(rsgl, tmp, &sreq->list, list) {
af_alg_free_sg(&rsgl->sgl);
if (rsgl != &sreq->first_sgl)
kfree(rsgl);
}
sgl = sreq->tsg;
n = sg_nents(sgl);
for_each_sg(sgl, sg, n, i)
put_page(sg_page(sg));
kfree(sreq->tsg);
}
static void skcipher_async_cb(struct crypto_async_request *req, int err)
{
struct sock *sk = req->data;
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct skcipher_async_req *sreq = GET_SREQ(req, ctx);
struct kiocb *iocb = sreq->iocb;
atomic_dec(&ctx->inflight);
skcipher_free_async_sgls(sreq);
kfree(req);
iocb->ki_complete(iocb, err, err);
}
static inline int skcipher_sndbuf(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) -
ctx->used, 0);
}
static inline bool skcipher_writable(struct sock *sk)
{
return PAGE_SIZE <= skcipher_sndbuf(sk);
}
static int skcipher_alloc_sgl(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct skcipher_sg_list *sgl;
struct scatterlist *sg = NULL;
sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
if (!list_empty(&ctx->tsgl))
sg = sgl->sg;
if (!sg || sgl->cur >= MAX_SGL_ENTS) {
sgl = sock_kmalloc(sk, sizeof(*sgl) +
sizeof(sgl->sg[0]) * (MAX_SGL_ENTS + 1),
GFP_KERNEL);
if (!sgl)
return -ENOMEM;
sg_init_table(sgl->sg, MAX_SGL_ENTS + 1);
sgl->cur = 0;
if (sg)
sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg);
list_add_tail(&sgl->list, &ctx->tsgl);
}
return 0;
}
static void skcipher_pull_sgl(struct sock *sk, int used, int put)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct skcipher_sg_list *sgl;
struct scatterlist *sg;
int i;
while (!list_empty(&ctx->tsgl)) {
sgl = list_first_entry(&ctx->tsgl, struct skcipher_sg_list,
list);
sg = sgl->sg;
for (i = 0; i < sgl->cur; i++) {
int plen = min_t(int, used, sg[i].length);
if (!sg_page(sg + i))
continue;
sg[i].length -= plen;
sg[i].offset += plen;
used -= plen;
ctx->used -= plen;
if (sg[i].length)
return;
if (put)
put_page(sg_page(sg + i));
sg_assign_page(sg + i, NULL);
}
list_del(&sgl->list);
sock_kfree_s(sk, sgl,
sizeof(*sgl) + sizeof(sgl->sg[0]) *
(MAX_SGL_ENTS + 1));
}
if (!ctx->used)
ctx->merge = 0;
}
static void skcipher_free_sgl(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
skcipher_pull_sgl(sk, ctx->used, 1);
}
static int skcipher_wait_for_wmem(struct sock *sk, unsigned flags)
{
long timeout;
DEFINE_WAIT(wait);
int err = -ERESTARTSYS;
if (flags & MSG_DONTWAIT)
return -EAGAIN;
sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
for (;;) {
if (signal_pending(current))
break;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
timeout = MAX_SCHEDULE_TIMEOUT;
if (sk_wait_event(sk, &timeout, skcipher_writable(sk))) {
err = 0;
break;
}
}
finish_wait(sk_sleep(sk), &wait);
return err;
}
static void skcipher_wmem_wakeup(struct sock *sk)
{
struct socket_wq *wq;
if (!skcipher_writable(sk))
return;
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
if (wq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
POLLRDNORM |
POLLRDBAND);
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
rcu_read_unlock();
}
static int skcipher_wait_for_data(struct sock *sk, unsigned flags)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
long timeout;
DEFINE_WAIT(wait);
int err = -ERESTARTSYS;
if (flags & MSG_DONTWAIT) {
return -EAGAIN;
}
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
for (;;) {
if (signal_pending(current))
break;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
timeout = MAX_SCHEDULE_TIMEOUT;
if (sk_wait_event(sk, &timeout, ctx->used)) {
err = 0;
break;
}
}
finish_wait(sk_sleep(sk), &wait);
sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
return err;
}
static void skcipher_data_wakeup(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct socket_wq *wq;
if (!ctx->used)
return;
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
if (wq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
POLLRDNORM |
POLLRDBAND);
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
rcu_read_unlock();
}
static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg,
size_t size)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(&ctx->req);
unsigned ivsize = crypto_skcipher_ivsize(tfm);
struct skcipher_sg_list *sgl;
struct af_alg_control con = {};
long copied = 0;
bool enc = 0;
bool init = 0;
int err;
int i;
if (msg->msg_controllen) {
err = af_alg_cmsg_send(msg, &con);
if (err)
return err;
init = 1;
switch (con.op) {
case ALG_OP_ENCRYPT:
enc = 1;
break;
case ALG_OP_DECRYPT:
enc = 0;
break;
default:
return -EINVAL;
}
if (con.iv && con.iv->ivlen != ivsize)
return -EINVAL;
}
err = -EINVAL;
lock_sock(sk);
if (!ctx->more && ctx->used)
goto unlock;
if (init) {
ctx->enc = enc;
if (con.iv)
memcpy(ctx->iv, con.iv->iv, ivsize);
}
while (size) {
struct scatterlist *sg;
unsigned long len = size;
int plen;
if (ctx->merge) {
sgl = list_entry(ctx->tsgl.prev,
struct skcipher_sg_list, list);
sg = sgl->sg + sgl->cur - 1;
len = min_t(unsigned long, len,
PAGE_SIZE - sg->offset - sg->length);
err = memcpy_from_msg(page_address(sg_page(sg)) +
sg->offset + sg->length,
msg, len);
if (err)
goto unlock;
sg->length += len;
ctx->merge = (sg->offset + sg->length) &
(PAGE_SIZE - 1);
ctx->used += len;
copied += len;
size -= len;
continue;
}
if (!skcipher_writable(sk)) {
err = skcipher_wait_for_wmem(sk, msg->msg_flags);
if (err)
goto unlock;
}
len = min_t(unsigned long, len, skcipher_sndbuf(sk));
err = skcipher_alloc_sgl(sk);
if (err)
goto unlock;
sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
sg = sgl->sg;
sg_unmark_end(sg + sgl->cur);
do {
i = sgl->cur;
plen = min_t(int, len, PAGE_SIZE);
sg_assign_page(sg + i, alloc_page(GFP_KERNEL));
err = -ENOMEM;
if (!sg_page(sg + i))
goto unlock;
err = memcpy_from_msg(page_address(sg_page(sg + i)),
msg, plen);
if (err) {
__free_page(sg_page(sg + i));
sg_assign_page(sg + i, NULL);
goto unlock;
}
sg[i].length = plen;
len -= plen;
ctx->used += plen;
copied += plen;
size -= plen;
sgl->cur++;
} while (len && sgl->cur < MAX_SGL_ENTS);
if (!size)
sg_mark_end(sg + sgl->cur - 1);
ctx->merge = plen & (PAGE_SIZE - 1);
}
err = 0;
ctx->more = msg->msg_flags & MSG_MORE;
unlock:
skcipher_data_wakeup(sk);
release_sock(sk);
return copied ?: err;
}
static ssize_t skcipher_sendpage(struct socket *sock, struct page *page,
int offset, size_t size, int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct skcipher_sg_list *sgl;
int err = -EINVAL;
if (flags & MSG_SENDPAGE_NOTLAST)
flags |= MSG_MORE;
lock_sock(sk);
if (!ctx->more && ctx->used)
goto unlock;
if (!size)
goto done;
if (!skcipher_writable(sk)) {
err = skcipher_wait_for_wmem(sk, flags);
if (err)
goto unlock;
}
err = skcipher_alloc_sgl(sk);
if (err)
goto unlock;
ctx->merge = 0;
sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
if (sgl->cur)
sg_unmark_end(sgl->sg + sgl->cur - 1);
sg_mark_end(sgl->sg + sgl->cur);
get_page(page);
sg_set_page(sgl->sg + sgl->cur, page, size, offset);
sgl->cur++;
ctx->used += size;
done:
ctx->more = flags & MSG_MORE;
unlock:
skcipher_data_wakeup(sk);
release_sock(sk);
return err ?: size;
}
static int skcipher_all_sg_nents(struct skcipher_ctx *ctx)
{
struct skcipher_sg_list *sgl;
struct scatterlist *sg;
int nents = 0;
list_for_each_entry(sgl, &ctx->tsgl, list) {
sg = sgl->sg;
while (!sg->length)
sg++;
nents += sg_nents(sg);
}
return nents;
}
static int skcipher_recvmsg_async(struct socket *sock, struct msghdr *msg,
int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct skcipher_sg_list *sgl;
struct scatterlist *sg;
struct skcipher_async_req *sreq;
struct skcipher_request *req;
struct skcipher_async_rsgl *last_rsgl = NULL;
unsigned int txbufs = 0, len = 0, tx_nents = skcipher_all_sg_nents(ctx);
unsigned int reqlen = sizeof(struct skcipher_async_req) +
GET_REQ_SIZE(ctx) + GET_IV_SIZE(ctx);
int err = -ENOMEM;
bool mark = false;
lock_sock(sk);
req = kmalloc(reqlen, GFP_KERNEL);
if (unlikely(!req))
goto unlock;
sreq = GET_SREQ(req, ctx);
sreq->iocb = msg->msg_iocb;
memset(&sreq->first_sgl, '\0', sizeof(struct skcipher_async_rsgl));
INIT_LIST_HEAD(&sreq->list);
sreq->tsg = kcalloc(tx_nents, sizeof(*sg), GFP_KERNEL);
if (unlikely(!sreq->tsg)) {
kfree(req);
goto unlock;
}
sg_init_table(sreq->tsg, tx_nents);
memcpy(sreq->iv, ctx->iv, GET_IV_SIZE(ctx));
skcipher_request_set_tfm(req, crypto_skcipher_reqtfm(&ctx->req));
skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
skcipher_async_cb, sk);
while (iov_iter_count(&msg->msg_iter)) {
struct skcipher_async_rsgl *rsgl;
int used;
if (!ctx->used) {
err = skcipher_wait_for_data(sk, flags);
if (err)
goto free;
}
sgl = list_first_entry(&ctx->tsgl,
struct skcipher_sg_list, list);
sg = sgl->sg;
while (!sg->length)
sg++;
used = min_t(unsigned long, ctx->used,
iov_iter_count(&msg->msg_iter));
used = min_t(unsigned long, used, sg->length);
if (txbufs == tx_nents) {
struct scatterlist *tmp;
int x;
/* Ran out of tx slots in async request
* need to expand */
tmp = kcalloc(tx_nents * 2, sizeof(*tmp),
GFP_KERNEL);
if (!tmp)
goto free;
sg_init_table(tmp, tx_nents * 2);
for (x = 0; x < tx_nents; x++)
sg_set_page(&tmp[x], sg_page(&sreq->tsg[x]),
sreq->tsg[x].length,
sreq->tsg[x].offset);
kfree(sreq->tsg);
sreq->tsg = tmp;
tx_nents *= 2;
mark = true;
}
/* Need to take over the tx sgl from ctx
* to the asynch req - these sgls will be freed later */
sg_set_page(sreq->tsg + txbufs++, sg_page(sg), sg->length,
sg->offset);
if (list_empty(&sreq->list)) {
rsgl = &sreq->first_sgl;
list_add_tail(&rsgl->list, &sreq->list);
} else {
rsgl = kmalloc(sizeof(*rsgl), GFP_KERNEL);
if (!rsgl) {
err = -ENOMEM;
goto free;
}
list_add_tail(&rsgl->list, &sreq->list);
}
used = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, used);
err = used;
if (used < 0)
goto free;
if (last_rsgl)
af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
last_rsgl = rsgl;
len += used;
skcipher_pull_sgl(sk, used, 0);
iov_iter_advance(&msg->msg_iter, used);
}
if (mark)
sg_mark_end(sreq->tsg + txbufs - 1);
skcipher_request_set_crypt(req, sreq->tsg, sreq->first_sgl.sgl.sg,
len, sreq->iv);
err = ctx->enc ? crypto_skcipher_encrypt(req) :
crypto_skcipher_decrypt(req);
if (err == -EINPROGRESS) {
atomic_inc(&ctx->inflight);
err = -EIOCBQUEUED;
goto unlock;
}
free:
skcipher_free_async_sgls(sreq);
kfree(req);
unlock:
skcipher_wmem_wakeup(sk);
release_sock(sk);
return err;
}
static int skcipher_recvmsg_sync(struct socket *sock, struct msghdr *msg,
int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
unsigned bs = crypto_skcipher_blocksize(crypto_skcipher_reqtfm(
&ctx->req));
struct skcipher_sg_list *sgl;
struct scatterlist *sg;
int err = -EAGAIN;
int used;
long copied = 0;
lock_sock(sk);
while (msg_data_left(msg)) {
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;
}
used = min_t(unsigned long, ctx->used, msg_data_left(msg));
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;
err = -EINVAL;
if (!used)
goto free;
skcipher_request_set_crypt(&ctx->req, sg, ctx->rsgl.sg, used,
ctx->iv);
err = af_alg_wait_for_completion(
ctx->enc ?
crypto_skcipher_encrypt(&ctx->req) :
crypto_skcipher_decrypt(&ctx->req),
&ctx->completion);
free:
af_alg_free_sg(&ctx->rsgl);
if (err)
goto unlock;
copied += used;
skcipher_pull_sgl(sk, used, 1);
iov_iter_advance(&msg->msg_iter, used);
}
err = 0;
unlock:
skcipher_wmem_wakeup(sk);
release_sock(sk);
return copied ?: err;
}
static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
size_t ignored, int flags)
{
return (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) ?
skcipher_recvmsg_async(sock, msg, flags) :
skcipher_recvmsg_sync(sock, msg, flags);
}
static unsigned int skcipher_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
unsigned int mask;
sock_poll_wait(file, sk_sleep(sk), wait);
mask = 0;
if (ctx->used)
mask |= POLLIN | POLLRDNORM;
if (skcipher_writable(sk))
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
return mask;
}
static struct proto_ops algif_skcipher_ops = {
.family = PF_ALG,
.connect = sock_no_connect,
.socketpair = sock_no_socketpair,
.getname = sock_no_getname,
.ioctl = sock_no_ioctl,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.getsockopt = sock_no_getsockopt,
.mmap = sock_no_mmap,
.bind = sock_no_bind,
.accept = sock_no_accept,
.setsockopt = sock_no_setsockopt,
.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_skcipher(name, type, mask);
}
static void skcipher_release(void *private)
{
crypto_free_skcipher(private);
}
static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
{
return crypto_skcipher_setkey(private, key, keylen);
}
static void skcipher_wait(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
int ctr = 0;
while (atomic_read(&ctx->inflight) && ctr++ < 100)
msleep(100);
}
static void skcipher_sock_destruct(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct skcipher_ctx *ctx = ask->private;
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(&ctx->req);
if (atomic_read(&ctx->inflight))
skcipher_wait(sk);
skcipher_free_sgl(sk);
sock_kzfree_s(sk, ctx->iv, crypto_skcipher_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_skcipher_reqsize(private);
ctx = sock_kmalloc(sk, len, GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->iv = sock_kmalloc(sk, crypto_skcipher_ivsize(private),
GFP_KERNEL);
if (!ctx->iv) {
sock_kfree_s(sk, ctx, len);
return -ENOMEM;
}
memset(ctx->iv, 0, crypto_skcipher_ivsize(private));
INIT_LIST_HEAD(&ctx->tsgl);
ctx->len = len;
ctx->used = 0;
ctx->more = 0;
ctx->merge = 0;
ctx->enc = 0;
atomic_set(&ctx->inflight, 0);
af_alg_init_completion(&ctx->completion);
ask->private = ctx;
skcipher_request_set_tfm(&ctx->req, private);
skcipher_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");