6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jakub Kicinski kuba@kernel.org
[ Upstream commit c57ca512f3b68ddcd62bda9cc24a8f5584ab01b1 ]
Factor out waiting for async encrypt and decrypt to finish. There are already multiple copies and a subsequent fix will need more. No functional changes.
Note that crypto_wait_req() returns wait->err
Signed-off-by: Jakub Kicinski kuba@kernel.org Reviewed-by: Simon Horman horms@kernel.org Reviewed-by: Sabrina Dubroca sd@queasysnail.net Signed-off-by: David S. Miller davem@davemloft.net Stable-dep-of: aec7961916f3 ("tls: fix race between async notify and socket close") Signed-off-by: Sasha Levin sashal@kernel.org --- net/tls/tls_sw.c | 96 +++++++++++++++++++++++------------------------- 1 file changed, 45 insertions(+), 51 deletions(-)
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index 47ae429e50e3..b146be099a3f 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -229,6 +229,20 @@ static void tls_decrypt_done(crypto_completion_data_t *data, int err) spin_unlock_bh(&ctx->decrypt_compl_lock); }
+static int tls_decrypt_async_wait(struct tls_sw_context_rx *ctx) +{ + int pending; + + spin_lock_bh(&ctx->decrypt_compl_lock); + reinit_completion(&ctx->async_wait.completion); + pending = atomic_read(&ctx->decrypt_pending); + spin_unlock_bh(&ctx->decrypt_compl_lock); + if (pending) + crypto_wait_req(-EINPROGRESS, &ctx->async_wait); + + return ctx->async_wait.err; +} + static int tls_do_decryption(struct sock *sk, struct scatterlist *sgin, struct scatterlist *sgout, @@ -496,6 +510,28 @@ static void tls_encrypt_done(crypto_completion_data_t *data, int err) schedule_delayed_work(&ctx->tx_work.work, 1); }
+static int tls_encrypt_async_wait(struct tls_sw_context_tx *ctx) +{ + int pending; + + spin_lock_bh(&ctx->encrypt_compl_lock); + ctx->async_notify = true; + + pending = atomic_read(&ctx->encrypt_pending); + spin_unlock_bh(&ctx->encrypt_compl_lock); + if (pending) + crypto_wait_req(-EINPROGRESS, &ctx->async_wait); + else + reinit_completion(&ctx->async_wait.completion); + + /* There can be no concurrent accesses, since we have no + * pending encrypt operations + */ + WRITE_ONCE(ctx->async_notify, false); + + return ctx->async_wait.err; +} + static int tls_do_encryption(struct sock *sk, struct tls_context *tls_ctx, struct tls_sw_context_tx *ctx, @@ -953,7 +989,6 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) int num_zc = 0; int orig_size; int ret = 0; - int pending;
if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_CMSG_COMPAT)) @@ -1122,24 +1157,12 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) if (!num_async) { goto send_end; } else if (num_zc) { - /* Wait for pending encryptions to get completed */ - spin_lock_bh(&ctx->encrypt_compl_lock); - ctx->async_notify = true; - - pending = atomic_read(&ctx->encrypt_pending); - spin_unlock_bh(&ctx->encrypt_compl_lock); - if (pending) - crypto_wait_req(-EINPROGRESS, &ctx->async_wait); - else - reinit_completion(&ctx->async_wait.completion); - - /* There can be no concurrent accesses, since we have no - * pending encrypt operations - */ - WRITE_ONCE(ctx->async_notify, false); + int err;
- if (ctx->async_wait.err) { - ret = ctx->async_wait.err; + /* Wait for pending encryptions to get completed */ + err = tls_encrypt_async_wait(ctx); + if (err) { + ret = err; copied = 0; } } @@ -1171,7 +1194,6 @@ void tls_sw_splice_eof(struct socket *sock) ssize_t copied = 0; bool retrying = false; int ret = 0; - int pending;
if (!ctx->open_rec) return; @@ -1203,22 +1225,7 @@ void tls_sw_splice_eof(struct socket *sock) }
/* Wait for pending encryptions to get completed */ - spin_lock_bh(&ctx->encrypt_compl_lock); - ctx->async_notify = true; - - pending = atomic_read(&ctx->encrypt_pending); - spin_unlock_bh(&ctx->encrypt_compl_lock); - if (pending) - crypto_wait_req(-EINPROGRESS, &ctx->async_wait); - else - reinit_completion(&ctx->async_wait.completion); - - /* There can be no concurrent accesses, since we have no pending - * encrypt operations - */ - WRITE_ONCE(ctx->async_notify, false); - - if (ctx->async_wait.err) + if (tls_encrypt_async_wait(ctx)) goto unlock;
/* Transmit if any encryptions have completed */ @@ -2197,16 +2204,10 @@ int tls_sw_recvmsg(struct sock *sk,
recv_end: if (async) { - int ret, pending; + int ret;
/* Wait for all previously submitted records to be decrypted */ - spin_lock_bh(&ctx->decrypt_compl_lock); - reinit_completion(&ctx->async_wait.completion); - pending = atomic_read(&ctx->decrypt_pending); - spin_unlock_bh(&ctx->decrypt_compl_lock); - ret = 0; - if (pending) - ret = crypto_wait_req(-EINPROGRESS, &ctx->async_wait); + ret = tls_decrypt_async_wait(ctx); __skb_queue_purge(&ctx->async_hold);
if (ret) { @@ -2425,16 +2426,9 @@ void tls_sw_release_resources_tx(struct sock *sk) struct tls_context *tls_ctx = tls_get_ctx(sk); struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx); struct tls_rec *rec, *tmp; - int pending;
/* Wait for any pending async encryptions to complete */ - spin_lock_bh(&ctx->encrypt_compl_lock); - ctx->async_notify = true; - pending = atomic_read(&ctx->encrypt_pending); - spin_unlock_bh(&ctx->encrypt_compl_lock); - - if (pending) - crypto_wait_req(-EINPROGRESS, &ctx->async_wait); + tls_encrypt_async_wait(ctx);
tls_tx_records(sk, -1);