From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DD86B6ABD for ; Fri, 17 Feb 2023 14:22:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 32044C433D2; Fri, 17 Feb 2023 14:22:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1676643759; bh=4VZAvBw9PiOMOV6bEtiTKMK52O0KqK74N8Q6Z8aB3xc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EWfA3jQgWAkP+snDUAKmmU7MG7sFfFdj48zYpbUgn5EFgRGJPvNM125Wwt3m7XSCD 56W4uDO4SiEwBLDOx3urHGe/RjCdxAKvGzAwWg6b6yShyczvOrfkwoWzIOsiEgHrCd GhIqZ7CPGExcfnclpSHHHqvUSQsWeKeCAXhBvins= Date: Fri, 17 Feb 2023 15:22:37 +0100 From: Greg KH To: Kuniyuki Iwashima Cc: netdev@vger.kernel.org, regressions@lists.linux.dev, stable@vger.kernel.org, w@1wt.eu, winter@winter.cafe Subject: Re: [REGRESSION] 5.15.88 and onwards no longer return EADDRINUSE from bind Message-ID: References: <20230213205835.56151-1-kuniyu@amazon.com> Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230213205835.56151-1-kuniyu@amazon.com> On Mon, Feb 13, 2023 at 12:58:35PM -0800, Kuniyuki Iwashima wrote: > From: Greg KH > Date: Mon, 13 Feb 2023 18:48:48 +0100 > > On Mon, Feb 13, 2023 at 08:44:55AM -0800, Kuniyuki Iwashima wrote: > > > From: Willy Tarreau > > > Date: Mon, 13 Feb 2023 08:52:34 +0100 > > > > Hi Greg, > > > > > > > > On Mon, Feb 13, 2023 at 08:25:34AM +0100, Greg KH wrote: > > > > > On Mon, Feb 13, 2023 at 05:27:03AM +0100, Willy Tarreau wrote: > > > > > > Hi, > > > > > > > > > > > > [CCed netdev] > > > > > > > > > > > > On Sun, Feb 12, 2023 at 10:38:40PM -0500, Winter wrote: > > > > > > > Hi all, > > > > > > > > > > > > > > I'm facing the same issue as > > > > > > > https://lore.kernel.org/stable/CAFsF8vL4CGFzWMb38_XviiEgxoKX0GYup=JiUFXUOmagdk9CRg@mail.gmail.com/, > > > > > > > but on 5.15. I've bisected it across releases to 5.15.88, and can reproduce > > > > > > > on 5.15.93. > > > > > > > > > > > > > > However, I cannot seem to find the identified problematic commit in the 5.15 > > > > > > > branch, so I'm unsure if this is a different issue or not. > > > > > > > > > > > > > > There's a few ways to reproduce this issue, but the one I've been using is > > > > > > > running libuv's (https://github.com/libuv/libuv) tests, specifically tests > > > > > > > 271 and 277. > > > > > > > > > > > > >From the linked patch: > > > > > > > > > > > > https://lore.kernel.org/stable/20221228144337.512799851@linuxfoundation.org/ > > > > > > > > > > But that commit only ended up in 6.0.y, not 5.15, so how is this an > > > > > issue in 5.15.y? > > > > > > > > Hmmm I plead -ENOCOFFEE on my side, I hadn't notice the "can't find the > > > > problematic commit", you're right indeed. > > > > > > > > However if the issue happened in 5.15.88, the only part touching the > > > > network listening area is this one which may introduce an EINVAL on > > > > one listening path, but that seems unrelated to me given that it's > > > > only for ULP that libuv doesn't seem to be using: > > > > > > > > dadd0dcaa67d ("net/ulp: prevent ULP without clone op from entering the LISTEN status") > > > > > > This commit accidentally backports a part of 7a7160edf1bf ("net: Return > > > errno in sk->sk_prot->get_port().") and removed err = -EADDRINUSE in > > > inet_csk_listen_start(). Then, listen() will return 0 even if ->get_port() > > > actually fails and returns 1. > > > > > > I can send a small revert or a whole backport, but which is preferable ? > > > The original patch is not for stable, but it will make future backports > > > easy. > > > > A whole revert is probably best, if it's not needed. But if it is, a > > fix up would be fine to get as well. > > dadd0dcaa67d is needed to fix potential double-free, so could you queue > this fixup for 5.15. ? > > ---8<--- > >From ad319ace8b5c1dd5105b7263b7ccfd0ba0926551 Mon Sep 17 00:00:00 2001 > From: Kuniyuki Iwashima > Date: Mon, 13 Feb 2023 20:45:48 +0000 > Subject: [PATCH] tcp: Fix listen() regression in 5.15.88. > > When we backport dadd0dcaa67d ("net/ulp: prevent ULP without clone op from > entering the LISTEN status"), we have accidentally backported a part of > 7a7160edf1bf ("net: Return errno in sk->sk_prot->get_port().") and removed > err = -EADDRINUSE in inet_csk_listen_start(). > > Thus, listen() no longer returns -EADDRINUSE even if ->get_port() failed > as reported in [0]. > > We set -EADDRINUSE to err just before ->get_port() to fix the regression. > > [0]: https://lore.kernel.org/stable/EF8A45D0-768A-4CD5-9A8A-0FA6E610ABF7@winter.cafe/ > > Reported-by: Winter > Signed-off-by: Kuniyuki Iwashima > --- > net/ipv4/inet_connection_sock.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c > index a86140ff093c..29ec42c1f5d0 100644 > --- a/net/ipv4/inet_connection_sock.c > +++ b/net/ipv4/inet_connection_sock.c > @@ -1070,6 +1070,7 @@ int inet_csk_listen_start(struct sock *sk, int backlog) > * It is OK, because this socket enters to hash table only > * after validation is complete. > */ > + err = -EADDRINUSE; > inet_sk_state_store(sk, TCP_LISTEN); > if (!sk->sk_prot->get_port(sk, inet->inet_num)) { > inet->inet_sport = htons(inet->inet_num); > -- > 2.38.1 > ---8<--- Thanks, now queued up. greg k-h