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authorIlya Lesokhin <ilyal@mellanox.com>2017-11-13 11:22:46 +0300
committerDavid S. Miller <davem@davemloft.net>2017-11-14 10:26:34 +0300
commitff45d820a2df163957ad8ab459b6eb6976144c18 (patch)
tree4bacc5b4e85cb2db15bb13f6cff0f6393fffc792 /net/tls
parent6d88207fcfddc002afe3e2e4a455e5201089d5d9 (diff)
downloadlinux-ff45d820a2df163957ad8ab459b6eb6976144c18.tar.xz
tls: Fix TLS ulp context leak, when TLS_TX setsockopt is not used.
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@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tls')
-rw-r--r--net/tls/tls_main.c22
-rw-r--r--net/tls/tls_sw.c4
2 files changed, 16 insertions, 10 deletions
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index de6a1416bc41..13427ee7c582 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -226,6 +226,12 @@ 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) {
+ kfree(ctx);
+ goto skip_tx_cleanup;
+ }
if (!tls_complete_pending_work(sk, ctx, 0, &timeo))
tls_handle_open_record(sk, 0);
@@ -242,13 +248,14 @@ 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;
- kfree(ctx);
+ if (ctx->tx_conf == TLS_SW_TX)
+ tls_sw_free_tx_resources(sk);
+skip_tx_cleanup:
release_sock(sk);
sk_proto_close(sk, timeout);
}
@@ -402,8 +409,6 @@ 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;
@@ -464,6 +469,7 @@ 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);
@@ -480,11 +486,11 @@ 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 f00383a37622..fcd92a9c2d06 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -639,7 +639,7 @@ 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);
@@ -650,6 +650,7 @@ static void tls_sw_free_resources(struct sock *sk)
tls_free_both_sg(sk);
kfree(ctx);
+ kfree(tls_ctx);
}
int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx)
@@ -679,7 +680,6 @@ 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;
switch (crypto_info->cipher_type) {