From: Pietro Borrello borrello@diag.uniroma1.it
[ Upstream commit 584f3742890e966d2f0a1f3c418c9ead70b2d99e ]
Add sock_init_data_uid() to explicitly initialize the socket uid. To initialise the socket uid, sock_init_data() assumes a the struct socket* sock is always embedded in a struct socket_alloc, used to access the corresponding inode uid. This may not be true. Examples are sockets created in tun_chr_open() and tap_open().
Fixes: 86741ec25462 ("net: core: Add a UID field to struct sock.") Signed-off-by: Pietro Borrello borrello@diag.uniroma1.it Reviewed-by: Eric Dumazet edumazet@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- include/net/sock.h | 7 ++++++- net/core/sock.c | 15 ++++++++++++--- 2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h index c65baac40548a..26dd07e47a7c7 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1706,7 +1706,12 @@ void sk_common_release(struct sock *sk); * Default socket callbacks and setup code */
-/* Initialise core socket variables */ +/* Initialise core socket variables using an explicit uid. */ +void sock_init_data_uid(struct socket *sock, struct sock *sk, kuid_t uid); + +/* Initialise core socket variables. + * Assumes struct socket *sock is embedded in a struct socket_alloc. + */ void sock_init_data(struct socket *sock, struct sock *sk);
/* diff --git a/net/core/sock.c b/net/core/sock.c index 6cca1ebf904ae..7f6f1a0bf8a13 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2889,7 +2889,7 @@ void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer) } EXPORT_SYMBOL(sk_stop_timer_sync);
-void sock_init_data(struct socket *sock, struct sock *sk) +void sock_init_data_uid(struct socket *sock, struct sock *sk, kuid_t uid) { sk_init_common(sk); sk->sk_send_head = NULL; @@ -2908,11 +2908,10 @@ void sock_init_data(struct socket *sock, struct sock *sk) sk->sk_type = sock->type; RCU_INIT_POINTER(sk->sk_wq, &sock->wq); sock->sk = sk; - sk->sk_uid = SOCK_INODE(sock)->i_uid; } else { RCU_INIT_POINTER(sk->sk_wq, NULL); - sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); } + sk->sk_uid = uid;
rwlock_init(&sk->sk_callback_lock); if (sk->sk_kern_sock) @@ -2970,6 +2969,16 @@ void sock_init_data(struct socket *sock, struct sock *sk) refcount_set(&sk->sk_refcnt, 1); atomic_set(&sk->sk_drops, 0); } +EXPORT_SYMBOL(sock_init_data_uid); + +void sock_init_data(struct socket *sock, struct sock *sk) +{ + kuid_t uid = sock ? + SOCK_INODE(sock)->i_uid : + make_kuid(sock_net(sk)->user_ns, 0); + + sock_init_data_uid(sock, sk, uid); +} EXPORT_SYMBOL(sock_init_data);
void lock_sock_nested(struct sock *sk, int subclass)