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net: add sock_init_data_uid()

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[ Upstream commit 584f374289 ]

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: 86741ec254 ("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>
This commit is contained in:
Pietro Borrello 2023-02-04 17:39:20 +00:00 • committed by Justin Hammond
parent a6a7b73d75
commit 9ce999b4c7
2 changed files with 18 additions and 4 deletions
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7
include/net/sock.h
View file

@ -1847,7 +1847,12 @@ 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);
/*

15
net/core/sock.c
View file

@ -3118,7 +3118,7 @@ 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;
@ -3137,11 +3137,10 @@ 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)
@ -3199,6 +3198,16 @@ 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)