linux-kernel - [PATCH] apparmor: add #ifdef checks for secmark filtering

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Date:   Fri,  5 Oct 2018 18:11:47 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>
Cc:     Arnd Bergmann <arnd@...db.de>, David Howells <dhowells@...hat.com>,
        Jann Horn <jannh@...gle.com>,
        Matthew Garrett <mjg59@...gle.com>,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] apparmor: add #ifdef checks for secmark filtering

The newly added code fails to build when either SECMARK or
NETFILTER are disabled:

security/apparmor/lsm.c: In function 'apparmor_socket_sock_rcv_skb':
security/apparmor/lsm.c:1138:12: error: 'struct sk_buff' has no member named 'secmark'; did you mean 'mark'?

security/apparmor/lsm.c:1671:21: error: 'struct nf_hook_state' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]

Add a set of #ifdef checks around it to only enable the code that
we can compile and that makes sense in that configuration.

Fixes: ab9f2115081a ("apparmor: Allow filtering based on secmark policy")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 security/apparmor/lsm.c | 10 ++++++++++
 security/apparmor/net.c |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 53201013c40e..b74b724d3e84 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1123,6 +1123,7 @@ static int apparmor_socket_shutdown(struct socket *sock, int how)
 	return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
 }
 
+#ifdef CONFIG_NETWORK_SECMARK
 /**
  * apparmor_socket_sock_recv_skb - check perms before associating skb to sk
  *
@@ -1141,6 +1142,7 @@ static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
 	return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
 				      skb->secmark, sk);
 }
+#endif
 
 
 static struct aa_label *sk_peer_label(struct sock *sk)
@@ -1235,6 +1237,7 @@ static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
 		ctx->label = aa_get_current_label();
 }
 
+#ifdef CONFIG_NETWORK_SECMARK
 static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb,
 				      struct request_sock *req)
 {
@@ -1246,6 +1249,7 @@ static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb,
 	return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
 				      skb->secmark, sk);
 }
+#endif
 
 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
@@ -1304,13 +1308,17 @@ static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
 	LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
 	LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
+#ifdef CONFIG_NETWORK_SECMARK
 	LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
+#endif
 	LSM_HOOK_INIT(socket_getpeersec_stream,
 		      apparmor_socket_getpeersec_stream),
 	LSM_HOOK_INIT(socket_getpeersec_dgram,
 		      apparmor_socket_getpeersec_dgram),
 	LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
+#ifdef CONFIG_NETWORK_SECMARK
 	LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
+#endif
 
 	LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
 	LSM_HOOK_INIT(cred_free, apparmor_cred_free),
@@ -1666,6 +1674,7 @@ static inline int apparmor_init_sysctl(void)
 }
 #endif /* CONFIG_SYSCTL */
 
+#if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
 static unsigned int apparmor_ip_postroute(void *priv,
 					  struct sk_buff *skb,
 					  const struct nf_hook_state *state)
@@ -1754,6 +1763,7 @@ static int __init apparmor_nf_ip_init(void)
 	return 0;
 }
 __initcall(apparmor_nf_ip_init);
+#endif
 
 static int __init apparmor_init(void)
 {
diff --git a/security/apparmor/net.c b/security/apparmor/net.c
index f9a678ce994f..c07fde444792 100644
--- a/security/apparmor/net.c
+++ b/security/apparmor/net.c
@@ -190,6 +190,7 @@ int aa_sock_file_perm(struct aa_label *label, const char *op, u32 request,
 	return aa_label_sk_perm(label, op, request, sock->sk);
 }
 
+#ifdef CONFIG_NETWORK_SECMARK
 static int apparmor_secmark_init(struct aa_secmark *secmark)
 {
 	struct aa_label *label;
@@ -254,3 +255,4 @@ int apparmor_secmark_check(struct aa_label *label, char *op, u32 request,
 				    aa_secmark_perm(profile, request, secid,
 						    &sa, sk));
 }
+#endif
-- 
2.18.0