netdev - [PATCH net-next 06/10] af_unix: preserve const qualifier in unix

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Date:   Fri, 17 Mar 2023 15:55:35 +0000
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>,
        Simon Horman <simon.horman@...igine.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 06/10] af_unix: preserve const qualifier in unix_sk()

We can change unix_sk() to propagate its argument const qualifier,
thanks to container_of_const().

We need to change dump_common_audit_data() 'struct unix_sock *u'
local var to get a const attribute.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/af_unix.h | 5 +----
 security/lsm_audit.c  | 2 +-
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index 45ebde587138e59f8331d358420d3fca79d9ee66..824c258143a3ab360b870fda38ba684b70068eee 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -74,10 +74,7 @@ struct unix_sock {
 #endif
 };
 
-static inline struct unix_sock *unix_sk(const struct sock *sk)
-{
-	return (struct unix_sock *)sk;
-}
+#define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
 
 #define peer_wait peer_wq.wait
 
diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index 00d3bdd386e294ecd562bfa8ce502bf179ad32d9..368e77ca43c4a5d5f71a7e9a0a1e58a006796aa6 100644
--- a/security/lsm_audit.c
+++ b/security/lsm_audit.c
@@ -310,7 +310,7 @@ static void dump_common_audit_data(struct audit_buffer *ab,
 	case LSM_AUDIT_DATA_NET:
 		if (a->u.net->sk) {
 			const struct sock *sk = a->u.net->sk;
-			struct unix_sock *u;
+			const struct unix_sock *u;
 			struct unix_address *addr;
 			int len = 0;
 			char *p = NULL;
-- 
2.40.0.rc2.332.ga46443480c-goog