linux-kernel - [less-CONFIG_NET v2 5/8] seccomp: cut off functions not required

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Message-ID: <1530189936-25780-6-git-send-email-nmanthey@amazon.de>
Date:   Thu, 28 Jun 2018 14:45:33 +0200
From:   Norbert Manthey <nmanthey@...zon.de>
To:     Norbert Manthey <nmanthey@...zon.de>,
        <linux-kernel@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Ido Schimmel <idosch@...lanox.com>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Tom Herbert <tom@...ntonium.net>,
        Simon Horman <simon.horman@...ronome.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        John Crispin <john@...ozen.org>,
        Sven Eckelmann <sven.eckelmann@...nmesh.com>,
        WANG Cong <xiyou.wangcong@...il.com>,
        David Ahern <dsahern@...il.com>,
        Jon Maloy <jon.maloy@...csson.com>, <netdev@...r.kernel.org>
Subject: [less-CONFIG_NET v2 5/8] seccomp: cut off functions not required

When using CONFIG_SECCOMP_FILTER, not all functions of filter.c and
flow_dissector.c are required. To not pull in more dependencies,
guard the functions that are not required with CONFIG_NET defines.
This way, these functions are enabled in case the file is compiled
because of CONFIG_NET, but they are not present when the file is
compiled because of other configurations.

Signed-off-by: Norbert Manthey <nmanthey@...zon.de>
---
 net/core/filter.c         | 2 ++
 net/core/flow_dissector.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index 61c24c9..410189c 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1250,6 +1250,7 @@ void bpf_prog_destroy(struct bpf_prog *fp)
 }
 EXPORT_SYMBOL_GPL(bpf_prog_destroy);
 
+#if defined(CONFIG_NET)
 /**
  *	sk_filter_trim_cap - run a packet through a socket filter
  *	@sk: sock associated with &sk_buff
@@ -6823,3 +6824,4 @@ int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
 	release_sock(sk);
 	return ret;
 }
+#endif  // CONFIG_NET
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 76d0b23..f5ba8e9 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -1219,6 +1219,7 @@ u32 skb_get_poff(const struct sk_buff *skb)
 	return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
 }
 
+#if defined(CONFIG_NET)
 __be32 flow_get_u32_src(const struct flow_keys *flow)
 {
 	switch (flow->control.addr_type) {
@@ -1340,6 +1341,7 @@ __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
 	return flow_hash_from_keys(keys);
 }
 EXPORT_SYMBOL(__get_hash_from_flowi6);
+#endif  // CONFIG_NET
 
 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
 	{
-- 
2.7.4

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