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Message-Id: <20181204103727.653383532@linuxfoundation.org>
Date: Tue, 4 Dec 2018 11:48:27 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Ilya Lesokhin <ilyal@...lanox.com>,
"David S. Miller" <davem@...emloft.net>,
Ben Hutchings <ben.hutchings@...ethink.co.uk>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 021/146] tls: Fix TLS ulp context leak, when TLS_TX setsockopt is not used.
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
commit ff45d820a2df163957ad8ab459b6eb6976144c18 upstream.
Previously the TLS ulp context would leak if we attached a TLS ulp
to a socket but did not use the TLS_TX setsockopt,
or did use it but it failed.
This patch solves the issue by overriding prot[TLS_BASE_TX].close
and fixing tls_sk_proto_close to work properly
when its called with ctx->tx_conf == TLS_BASE_TX.
This patch also removes ctx->free_resources as we can use ctx->tx_conf
to obtain the relevant information.
Fixes: 3c4d7559159b ('tls: kernel TLS support')
Signed-off-by: Ilya Lesokhin <ilyal@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 4.14: Keep using tls_ctx_free() as introduced by
the earlier backport of "tls: zero the crypto information from
tls_context before freeing"]
Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
include/net/tls.h | 2 +-
net/tls/tls_main.c | 24 ++++++++++++++++--------
net/tls/tls_sw.c | 3 +--
3 files changed, 18 insertions(+), 11 deletions(-)
diff --git a/include/net/tls.h b/include/net/tls.h
index 0c3ab2af74d3..604fd982da19 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -106,7 +106,6 @@ struct tls_context {
u16 pending_open_record_frags;
int (*push_pending_record)(struct sock *sk, int flags);
- void (*free_resources)(struct sock *sk);
void (*sk_write_space)(struct sock *sk);
void (*sk_proto_close)(struct sock *sk, long timeout);
@@ -131,6 +130,7 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
int tls_sw_sendpage(struct sock *sk, struct page *page,
int offset, size_t size, int flags);
void tls_sw_close(struct sock *sk, long timeout);
+void tls_sw_free_tx_resources(struct sock *sk);
void tls_sk_destruct(struct sock *sk, struct tls_context *ctx);
void tls_icsk_clean_acked(struct sock *sk);
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 191a8adee3ea..b5f9c578bcf0 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -249,6 +249,12 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
void (*sk_proto_close)(struct sock *sk, long timeout);
lock_sock(sk);
+ sk_proto_close = ctx->sk_proto_close;
+
+ if (ctx->tx_conf == TLS_BASE_TX) {
+ tls_ctx_free(ctx);
+ goto skip_tx_cleanup;
+ }
if (!tls_complete_pending_work(sk, ctx, 0, &timeo))
tls_handle_open_record(sk, 0);
@@ -265,13 +271,16 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
sg++;
}
}
- ctx->free_resources(sk);
+
kfree(ctx->rec_seq);
kfree(ctx->iv);
- sk_proto_close = ctx->sk_proto_close;
- tls_ctx_free(ctx);
+ if (ctx->tx_conf == TLS_SW_TX) {
+ tls_sw_free_tx_resources(sk);
+ tls_ctx_free(ctx);
+ }
+skip_tx_cleanup:
release_sock(sk);
sk_proto_close(sk, timeout);
}
@@ -428,8 +437,6 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
ctx->sk_write_space = sk->sk_write_space;
sk->sk_write_space = tls_write_space;
- ctx->sk_proto_close = sk->sk_prot->close;
-
/* currently SW is default, we will have ethtool in future */
rc = tls_set_sw_offload(sk, ctx);
tx_conf = TLS_SW_TX;
@@ -499,6 +506,7 @@ static int tls_init(struct sock *sk)
icsk->icsk_ulp_data = ctx;
ctx->setsockopt = sk->sk_prot->setsockopt;
ctx->getsockopt = sk->sk_prot->getsockopt;
+ ctx->sk_proto_close = sk->sk_prot->close;
ctx->tx_conf = TLS_BASE_TX;
update_sk_prot(sk, ctx);
@@ -515,11 +523,11 @@ static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
static void build_protos(struct proto *prot, struct proto *base)
{
prot[TLS_BASE_TX] = *base;
- prot[TLS_BASE_TX].setsockopt = tls_setsockopt;
- prot[TLS_BASE_TX].getsockopt = tls_getsockopt;
+ prot[TLS_BASE_TX].setsockopt = tls_setsockopt;
+ prot[TLS_BASE_TX].getsockopt = tls_getsockopt;
+ prot[TLS_BASE_TX].close = tls_sk_proto_close;
prot[TLS_SW_TX] = prot[TLS_BASE_TX];
- prot[TLS_SW_TX].close = tls_sk_proto_close;
prot[TLS_SW_TX].sendmsg = tls_sw_sendmsg;
prot[TLS_SW_TX].sendpage = tls_sw_sendpage;
}
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 6ae9ca567d6c..5996fb5756e1 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -646,7 +646,7 @@ sendpage_end:
return ret;
}
-static void tls_sw_free_resources(struct sock *sk)
+void tls_sw_free_tx_resources(struct sock *sk)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
@@ -685,7 +685,6 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx)
}
ctx->priv_ctx = (struct tls_offload_context *)sw_ctx;
- ctx->free_resources = tls_sw_free_resources;
crypto_info = &ctx->crypto_send.info;
switch (crypto_info->cipher_type) {
--
2.17.1
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