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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: 3c4d755915 ('tls: kernel TLS support')
Signed-off-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilya Lesokhin 2017-11-13 10:22:46 +02:00 committed by David S. Miller
parent 6d88207fcf
commit ff45d820a2
3 changed files with 17 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/tls.h
View File

@ -99,7 +99,6 @@ 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);
@ -124,6 +123,7 @@ 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);

22
net/tls/tls_main.c
View File

@ -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;
}

4
net/tls/tls_sw.c
View File

@ -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) {