[PATCH net-next 1/4] security: Constify sk in the sk_getsecid hook.

[Guillaume Nault <gnault@redhat.com>]

The sk_getsecid hook shouldn't need to modify its socket argument.
Make it const so that callers of security_sk_classify_flow() can use a
const struct sock *.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
---
 include/linux/lsm_hook_defs.h | 2 +-
 include/linux/security.h      | 5 +++--
 security/security.c           | 2 +-
 security/selinux/hooks.c      | 4 ++--
 4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 7308a1a7599b..4f2621e87634 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -316,7 +316,7 @@ LSM_HOOK(int, 0, sk_alloc_security, struct sock *sk, int family, gfp_t priority)
 LSM_HOOK(void, LSM_RET_VOID, sk_free_security, struct sock *sk)
 LSM_HOOK(void, LSM_RET_VOID, sk_clone_security, const struct sock *sk,
 	 struct sock *newsk)
-LSM_HOOK(void, LSM_RET_VOID, sk_getsecid, struct sock *sk, u32 *secid)
+LSM_HOOK(void, LSM_RET_VOID, sk_getsecid, const struct sock *sk, u32 *secid)
 LSM_HOOK(void, LSM_RET_VOID, sock_graft, struct sock *sk, struct socket *parent)
 LSM_HOOK(int, 0, inet_conn_request, const struct sock *sk, struct sk_buff *skb,
 	 struct request_sock *req)
diff --git a/include/linux/security.h b/include/linux/security.h
index 32828502f09e..994cf099d9ac 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1439,7 +1439,8 @@ int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u
 int security_sk_alloc(struct sock *sk, int family, gfp_t priority);
 void security_sk_free(struct sock *sk);
 void security_sk_clone(const struct sock *sk, struct sock *newsk);
-void security_sk_classify_flow(struct sock *sk, struct flowi_common *flic);
+void security_sk_classify_flow(const struct sock *sk,
+			       struct flowi_common *flic);
 void security_req_classify_flow(const struct request_sock *req,
 				struct flowi_common *flic);
 void security_sock_graft(struct sock*sk, struct socket *parent);
@@ -1597,7 +1598,7 @@ static inline void security_sk_clone(const struct sock *sk, struct sock *newsk)
 {
 }
 
-static inline void security_sk_classify_flow(struct sock *sk,
+static inline void security_sk_classify_flow(const struct sock *sk,
 					     struct flowi_common *flic)
 {
 }
diff --git a/security/security.c b/security/security.c
index b720424ca37d..2dfc7b9f6ed9 100644
--- a/security/security.c
+++ b/security/security.c
@@ -4396,7 +4396,7 @@ void security_sk_clone(const struct sock *sk, struct sock *newsk)
 }
 EXPORT_SYMBOL(security_sk_clone);
 
-void security_sk_classify_flow(struct sock *sk, struct flowi_common *flic)
+void security_sk_classify_flow(const struct sock *sk, struct flowi_common *flic)
 {
 	call_void_hook(sk_getsecid, sk, &flic->flowic_secid);
 }
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index d06e350fedee..2bdc48dd8670 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -5167,12 +5167,12 @@ static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
 	selinux_netlbl_sk_security_reset(newsksec);
 }
 
-static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
+static void selinux_sk_getsecid(const struct sock *sk, u32 *secid)
 {
 	if (!sk)
 		*secid = SECINITSID_ANY_SOCKET;
 	else {
-		struct sk_security_struct *sksec = sk->sk_security;
+		const struct sk_security_struct *sksec = sk->sk_security;
 
 		*secid = sksec->sid;
 	}
-- 
2.39.2