From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kuniyuki Iwashima Subject: Re: [PATCH v2] net/rose: Fix to not accept on connected socket Date: Tue, 24 Jan 2023 18:28:54 -0800 Message-ID: <20230125022854.69146-1-kuniyu@amazon.com> References: <20230125020809.67989-1-kuniyu@amazon.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1674613752; x=1706149752; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5yENitLhmnB5lcFwq2NGFvsRR9PFM2iW0iudgDkY0c0=; b=XjZz2YlVE2fCSJWZyjgXJ6h68of+n7HFh/EutWhFG7aTq95DU1t34Zg4 aD9WNjSFImuWvIRe24RSsfMqehxv0Z4MtP1SL1fEajp6JAQm6wlPFkda5 vAHXTqs5y6rEu1JAh2fCOsm0ZZoCsaU/oe4/f+XhkgFGHrvy/srDdIumk E=; In-Reply-To: <20230125020809.67989-1-kuniyu@amazon.com> List-ID: Content-Type: text/plain; charset="us-ascii" To: v4bel@theori.io Cc: kuniyu@amazon.com, davem@davemloft.net, edumazet@google.com, imv4bel@gmail.com, kuba@kernel.org, linux-hams@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, ralf@linux-mips.org From: Kuniyuki Iwashima Date: Tue, 24 Jan 2023 18:08:09 -0800 > From: Hyunwoo Kim > Date: Mon, 23 Jan 2023 11:40:20 -0800 > > If listen() and accept() are called on a rose socket > > that connect() is successful, accept() succeeds immediately. > > This is because rose_connect() queues the skb to > > sk->sk_receive_queue, and rose_accept() dequeues it. Same comment for the netrom patch here. https://lore.kernel.org/netdev/20230125014347.65971-1-kuniyu@amazon.com/ The skb which the problematic accept() dequeues is created by sendmsg(), not connect(), right ? > > > > This creates a child socket with the sk of the parent > > rose socket, which can cause confusion. > > > > Fix rose_listen() to return -EINVAL if the socket has > > already been successfully connected, and add lock_sock > > to prevent this issue. > > > > Signed-off-by: Hyunwoo Kim > > Reviewed-by: Kuniyuki Iwashima > > > > --- > > net/rose/af_rose.c | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c > > index 36fefc3957d7..ca2b17f32670 100644 > > --- a/net/rose/af_rose.c > > +++ b/net/rose/af_rose.c > > @@ -488,6 +488,12 @@ static int rose_listen(struct socket *sock, int backlog) > > { > > struct sock *sk = sock->sk; > > > > + lock_sock(sk); > > + if (sock->state != SS_UNCONNECTED) { > > + release_sock(sk); > > + return -EINVAL; > > + } > > + > > if (sk->sk_state != TCP_LISTEN) { > > struct rose_sock *rose = rose_sk(sk); > > > > @@ -497,8 +503,10 @@ static int rose_listen(struct socket *sock, int backlog) > > memset(rose->dest_digis, 0, AX25_ADDR_LEN * ROSE_MAX_DIGIS); > > sk->sk_max_ack_backlog = backlog; > > sk->sk_state = TCP_LISTEN; > > + release_sock(sk); > > return 0; > > } > > + release_sock(sk); > > > > return -EOPNOTSUPP; > > } > > -- > > 2.25.1