From: Florian Westphal <fw@strlen.de>
commit 51fa7f8ebf0e25c7a9039fa3988a623d5f3855aa upstream.
These structures are initialised from the init hooks, so we can't make
them 'const'. But no writes occur afterwards, so we can use ro_after_init.
Also, remove bogus EXPORT_SYMBOL, the only access comes from ip
stack, not from kernel modules.
Cc: stable@vger.kernel.org # 5.10
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
net/mptcp/subflow.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 2e9238490924..61919e2499e7 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -360,8 +360,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
}
struct request_sock_ops mptcp_subflow_request_sock_ops;
-EXPORT_SYMBOL_GPL(mptcp_subflow_request_sock_ops);
-static struct tcp_request_sock_ops subflow_request_sock_ipv4_ops;
+static struct tcp_request_sock_ops subflow_request_sock_ipv4_ops __ro_after_init;
static int subflow_v4_conn_request(struct sock *sk, struct sk_buff *skb)
{
@@ -382,9 +381,9 @@ static int subflow_v4_conn_request(struct sock *sk, struct sk_buff *skb)
}
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
-static struct tcp_request_sock_ops subflow_request_sock_ipv6_ops;
-static struct inet_connection_sock_af_ops subflow_v6_specific;
-static struct inet_connection_sock_af_ops subflow_v6m_specific;
+static struct tcp_request_sock_ops subflow_request_sock_ipv6_ops __ro_after_init;
+static struct inet_connection_sock_af_ops subflow_v6_specific __ro_after_init;
+static struct inet_connection_sock_af_ops subflow_v6m_specific __ro_after_init;
static int subflow_v6_conn_request(struct sock *sk, struct sk_buff *skb)
{
@@ -636,7 +635,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
return child;
}
-static struct inet_connection_sock_af_ops subflow_specific;
+static struct inet_connection_sock_af_ops subflow_specific __ro_after_init;
enum mapping_status {
MAPPING_OK,
@@ -1017,7 +1016,7 @@ static void subflow_write_space(struct sock *sk)
}
}
-static struct inet_connection_sock_af_ops *
+static const struct inet_connection_sock_af_ops *
subflow_default_af_ops(struct sock *sk)
{
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
@@ -1032,7 +1031,7 @@ void mptcpv6_handle_mapped(struct sock *sk, bool mapped)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
struct inet_connection_sock *icsk = inet_csk(sk);
- struct inet_connection_sock_af_ops *target;
+ const struct inet_connection_sock_af_ops *target;
target = mapped ? &subflow_v6m_specific : subflow_default_af_ops(sk);
--
2.39.0
This is a note to let you know that I've just added the patch titled
mptcp: mark ops structures as ro_after_init
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mptcp-mark-ops-structures-as-ro_after_init.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
From stable-owner@vger.kernel.org Sat Jan 7 02:46:46 2023
From: Mat Martineau <mathew.j.martineau@linux.intel.com>
Date: Fri, 6 Jan 2023 17:46:28 -0800
Subject: mptcp: mark ops structures as ro_after_init
To: stable@vger.kernel.org, gregkh@linuxfoundation.org
Cc: Florian Westphal <fw@strlen.de>, matthieu.baerts@tessares.net, pabeni@redhat.com, mptcp@lists.linux.dev, Mat Martineau <mathew.j.martineau@linux.intel.com>, Jakub Kicinski <kuba@kernel.org>
Message-ID: <20230107014631.449550-2-mathew.j.martineau@linux.intel.com>
From: Mat Martineau <mathew.j.martineau@linux.intel.com>
From: Florian Westphal <fw@strlen.de>
commit 51fa7f8ebf0e25c7a9039fa3988a623d5f3855aa upstream.
These structures are initialised from the init hooks, so we can't make
them 'const'. But no writes occur afterwards, so we can use ro_after_init.
Also, remove bogus EXPORT_SYMBOL, the only access comes from ip
stack, not from kernel modules.
Cc: stable@vger.kernel.org # 5.10
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/mptcp/subflow.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -360,8 +360,7 @@ do_reset:
}
struct request_sock_ops mptcp_subflow_request_sock_ops;
-EXPORT_SYMBOL_GPL(mptcp_subflow_request_sock_ops);
-static struct tcp_request_sock_ops subflow_request_sock_ipv4_ops;
+static struct tcp_request_sock_ops subflow_request_sock_ipv4_ops __ro_after_init;
static int subflow_v4_conn_request(struct sock *sk, struct sk_buff *skb)
{
@@ -382,9 +381,9 @@ drop:
}
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
-static struct tcp_request_sock_ops subflow_request_sock_ipv6_ops;
-static struct inet_connection_sock_af_ops subflow_v6_specific;
-static struct inet_connection_sock_af_ops subflow_v6m_specific;
+static struct tcp_request_sock_ops subflow_request_sock_ipv6_ops __ro_after_init;
+static struct inet_connection_sock_af_ops subflow_v6_specific __ro_after_init;
+static struct inet_connection_sock_af_ops subflow_v6m_specific __ro_after_init;
static int subflow_v6_conn_request(struct sock *sk, struct sk_buff *skb)
{
@@ -636,7 +635,7 @@ dispose_child:
return child;
}
-static struct inet_connection_sock_af_ops subflow_specific;
+static struct inet_connection_sock_af_ops subflow_specific __ro_after_init;
enum mapping_status {
MAPPING_OK,
@@ -1017,7 +1016,7 @@ static void subflow_write_space(struct s
}
}
-static struct inet_connection_sock_af_ops *
+static const struct inet_connection_sock_af_ops *
subflow_default_af_ops(struct sock *sk)
{
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
@@ -1032,7 +1031,7 @@ void mptcpv6_handle_mapped(struct sock *
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
struct inet_connection_sock *icsk = inet_csk(sk);
- struct inet_connection_sock_af_ops *target;
+ const struct inet_connection_sock_af_ops *target;
target = mapped ? &subflow_v6m_specific : subflow_default_af_ops(sk);
Patches currently in stable-queue which might be from stable-owner@vger.kernel.org are
queue-5.10/mptcp-use-proper-req-destructor-for-ipv6.patch
queue-5.10/mptcp-remove-mptcp-ifdef-in-tcp-syn-cookies.patch
queue-5.10/mptcp-dedicated-request-sock-for-subflow-in-v6.patch
queue-5.10/mptcp-mark-ops-structures-as-ro_after_init.patch
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