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authorLinus Torvalds <torvalds@linux-foundation.org>2017-12-22 12:22:48 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-12-22 12:22:48 -0800
commit0fc0f18bed026a7aa6d5499d06cc9a6eb47dc3cc (patch)
tree65b591e05b563441c22d28ef76485de8ad1deefc
parentMerge tag 'pinctrl-v4.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl (diff)
parentcrypto: af_alg - fix race accessing cipher request (diff)
downloadlinux-dev-0fc0f18bed026a7aa6d5499d06cc9a6eb47dc3cc.tar.xz
linux-dev-0fc0f18bed026a7aa6d5499d06cc9a6eb47dc3cc.zip
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto fixes from Herbert Xu: "This fixes the following issues: - fix chacha20 crash on zero-length input due to unset IV - fix potential race conditions in mcryptd with spinlock - only wait once at top of algif recvmsg to avoid inconsistencies - fix potential use-after-free in algif_aead/algif_skcipher" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: af_alg - fix race accessing cipher request crypto: mcryptd - protect the per-CPU queue with a lock crypto: af_alg - wait for data at beginning of recvmsg crypto: skcipher - set walk.iv for zero-length inputs
-rw-r--r--crypto/af_alg.c6
-rw-r--r--crypto/algif_aead.c16
-rw-r--r--crypto/algif_skcipher.c16
-rw-r--r--crypto/mcryptd.c23
-rw-r--r--crypto/skcipher.c10
-rw-r--r--include/crypto/mcryptd.h1
6 files changed, 37 insertions, 35 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 415a54ced4d6..444a387df219 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -1138,12 +1138,6 @@ int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags,
if (!af_alg_readable(sk))
break;
- if (!ctx->used) {
- err = af_alg_wait_for_data(sk, flags);
- if (err)
- return err;
- }
-
seglen = min_t(size_t, (maxsize - len),
msg_data_left(msg));
diff --git a/crypto/algif_aead.c b/crypto/algif_aead.c
index 48b34e9c6834..ddcc45f77edd 100644
--- a/crypto/algif_aead.c
+++ b/crypto/algif_aead.c
@@ -111,6 +111,12 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
size_t usedpages = 0; /* [in] RX bufs to be used from user */
size_t processed = 0; /* [in] TX bufs to be consumed */
+ if (!ctx->used) {
+ err = af_alg_wait_for_data(sk, flags);
+ if (err)
+ return err;
+ }
+
/*
* Data length provided by caller via sendmsg/sendpage that has not
* yet been processed.
@@ -285,6 +291,10 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
/* AIO operation */
sock_hold(sk);
areq->iocb = msg->msg_iocb;
+
+ /* Remember output size that will be generated. */
+ areq->outlen = outlen;
+
aead_request_set_callback(&areq->cra_u.aead_req,
CRYPTO_TFM_REQ_MAY_BACKLOG,
af_alg_async_cb, areq);
@@ -292,12 +302,8 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
crypto_aead_decrypt(&areq->cra_u.aead_req);
/* AIO operation in progress */
- if (err == -EINPROGRESS || err == -EBUSY) {
- /* Remember output size that will be generated. */
- areq->outlen = outlen;
-
+ if (err == -EINPROGRESS || err == -EBUSY)
return -EIOCBQUEUED;
- }
sock_put(sk);
} else {
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index 30cff827dd8f..baef9bfccdda 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -72,6 +72,12 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
int err = 0;
size_t len = 0;
+ if (!ctx->used) {
+ err = af_alg_wait_for_data(sk, flags);
+ if (err)
+ return err;
+ }
+
/* Allocate cipher request for current operation. */
areq = af_alg_alloc_areq(sk, sizeof(struct af_alg_async_req) +
crypto_skcipher_reqsize(tfm));
@@ -119,6 +125,10 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
/* AIO operation */
sock_hold(sk);
areq->iocb = msg->msg_iocb;
+
+ /* Remember output size that will be generated. */
+ areq->outlen = len;
+
skcipher_request_set_callback(&areq->cra_u.skcipher_req,
CRYPTO_TFM_REQ_MAY_SLEEP,
af_alg_async_cb, areq);
@@ -127,12 +137,8 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
crypto_skcipher_decrypt(&areq->cra_u.skcipher_req);
/* AIO operation in progress */
- if (err == -EINPROGRESS || err == -EBUSY) {
- /* Remember output size that will be generated. */
- areq->outlen = len;
-
+ if (err == -EINPROGRESS || err == -EBUSY)
return -EIOCBQUEUED;
- }
sock_put(sk);
} else {
diff --git a/crypto/mcryptd.c b/crypto/mcryptd.c
index 4e6472658852..eca04d3729b3 100644
--- a/crypto/mcryptd.c
+++ b/crypto/mcryptd.c
@@ -81,6 +81,7 @@ static int mcryptd_init_queue(struct mcryptd_queue *queue,
pr_debug("cpu_queue #%d %p\n", cpu, queue->cpu_queue);
crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
INIT_WORK(&cpu_queue->work, mcryptd_queue_worker);
+ spin_lock_init(&cpu_queue->q_lock);
}
return 0;
}
@@ -104,15 +105,16 @@ static int mcryptd_enqueue_request(struct mcryptd_queue *queue,
int cpu, err;
struct mcryptd_cpu_queue *cpu_queue;
- cpu = get_cpu();
- cpu_queue = this_cpu_ptr(queue->cpu_queue);
- rctx->tag.cpu = cpu;
+ cpu_queue = raw_cpu_ptr(queue->cpu_queue);
+ spin_lock(&cpu_queue->q_lock);
+ cpu = smp_processor_id();
+ rctx->tag.cpu = smp_processor_id();
err = crypto_enqueue_request(&cpu_queue->queue, request);
pr_debug("enqueue request: cpu %d cpu_queue %p request %p\n",
cpu, cpu_queue, request);
+ spin_unlock(&cpu_queue->q_lock);
queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
- put_cpu();
return err;
}
@@ -161,16 +163,11 @@ static void mcryptd_queue_worker(struct work_struct *work)
cpu_queue = container_of(work, struct mcryptd_cpu_queue, work);
i = 0;
while (i < MCRYPTD_BATCH || single_task_running()) {
- /*
- * preempt_disable/enable is used to prevent
- * being preempted by mcryptd_enqueue_request()
- */
- local_bh_disable();
- preempt_disable();
+
+ spin_lock_bh(&cpu_queue->q_lock);
backlog = crypto_get_backlog(&cpu_queue->queue);
req = crypto_dequeue_request(&cpu_queue->queue);
- preempt_enable();
- local_bh_enable();
+ spin_unlock_bh(&cpu_queue->q_lock);
if (!req) {
mcryptd_opportunistic_flush();
@@ -185,7 +182,7 @@ static void mcryptd_queue_worker(struct work_struct *work)
++i;
}
if (cpu_queue->queue.qlen)
- queue_work(kcrypto_wq, &cpu_queue->work);
+ queue_work_on(smp_processor_id(), kcrypto_wq, &cpu_queue->work);
}
void mcryptd_flusher(struct work_struct *__work)
diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 778e0ff42bfa..11af5fd6a443 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -449,6 +449,8 @@ static int skcipher_walk_skcipher(struct skcipher_walk *walk,
walk->total = req->cryptlen;
walk->nbytes = 0;
+ walk->iv = req->iv;
+ walk->oiv = req->iv;
if (unlikely(!walk->total))
return 0;
@@ -456,9 +458,6 @@ static int skcipher_walk_skcipher(struct skcipher_walk *walk,
scatterwalk_start(&walk->in, req->src);
scatterwalk_start(&walk->out, req->dst);
- walk->iv = req->iv;
- walk->oiv = req->iv;
-
walk->flags &= ~SKCIPHER_WALK_SLEEP;
walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
SKCIPHER_WALK_SLEEP : 0;
@@ -510,6 +509,8 @@ static int skcipher_walk_aead_common(struct skcipher_walk *walk,
int err;
walk->nbytes = 0;
+ walk->iv = req->iv;
+ walk->oiv = req->iv;
if (unlikely(!walk->total))
return 0;
@@ -525,9 +526,6 @@ static int skcipher_walk_aead_common(struct skcipher_walk *walk,
scatterwalk_done(&walk->in, 0, walk->total);
scatterwalk_done(&walk->out, 0, walk->total);
- walk->iv = req->iv;
- walk->oiv = req->iv;
-
if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP)
walk->flags |= SKCIPHER_WALK_SLEEP;
else
diff --git a/include/crypto/mcryptd.h b/include/crypto/mcryptd.h
index cceafa01f907..b67404fc4b34 100644
--- a/include/crypto/mcryptd.h
+++ b/include/crypto/mcryptd.h
@@ -27,6 +27,7 @@ static inline struct mcryptd_ahash *__mcryptd_ahash_cast(
struct mcryptd_cpu_queue {
struct crypto_queue queue;
+ spinlock_t q_lock;
struct work_struct work;
};