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Revert "bpf, sockmap: af_unix stream sockets need to hold ref for pair sock"

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This reverts commit 90d1f74c3c which is
commit bffdeaa8a5 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I8f9ee72f8269598b93fe7abb14acd0d190242dcc
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman
2024-01-15 11:32:48 +00:00
parent 190985b1db
commit acd1add3c8
5 changed files with 2 additions and 9 deletions
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1
include/linux/skmsg.h
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@@ -106,7 +106,6 @@ struct sk_psock {
struct mutex work_mutex;
struct sk_psock_work_state work_state;
struct delayed_work work;
struct sock *sk_pair;
struct rcu_work rwork;
};

1
include/net/af_unix.h
View File

@@ -77,7 +77,6 @@ static inline struct unix_sock *unix_sk(const struct sock *sk)
{
return (struct unix_sock *)sk;
}
#define unix_peer(sk) (unix_sk(sk)->peer)
#define peer_wait peer_wq.wait

2
net/core/skmsg.c
View File

@@ -825,8 +825,6 @@ static void sk_psock_destroy(struct work_struct *work)
if (psock->sk_redir)
sock_put(psock->sk_redir);
if (psock->sk_pair)
sock_put(psock->sk_pair);
sock_put(psock->sk);
kfree(psock);
}

2
net/unix/af_unix.c
View File

@@ -211,6 +211,8 @@ static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb)
}
#endif /* CONFIG_SECURITY_NETWORK */
#define unix_peer(sk) (unix_sk(sk)->peer)
static inline int unix_our_peer(struct sock *sk, struct sock *osk)
{
return unix_peer(osk) == sk;

5
net/unix/unix_bpf.c
View File

@@ -159,17 +159,12 @@ int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool re
int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore)
{
struct sock *sk_pair;
if (restore) {
sk->sk_write_space = psock->saved_write_space;
sock_replace_proto(sk, psock->sk_proto);
return 0;
}
sk_pair = unix_peer(sk);
sock_hold(sk_pair);
psock->sk_pair = sk_pair;
unix_stream_bpf_check_needs_rebuild(psock->sk_proto);
sock_replace_proto(sk, &unix_stream_bpf_prot);
return 0;