From: David Laight <David.Laight@ACULAB.COM>
To: 'Christoph Hellwig' <hch@lst.de>
Cc: "David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Vlad Yasevich <vyasevich@gmail.com>,
Neil Horman <nhorman@tuxdriver.com>,
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
Jon Maloy <jmaloy@redhat.com>, Ying Xue <ying.xue@windriver.com>,
"drbd-dev@lists.linbit.com" <drbd-dev@lists.linbit.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
"target-devel@vger.kernel.org" <target-devel@vger.kernel.org>,
"linux-afs@lists.infradead.org" <linux-afs@lists.infradead.org>l
Subject: RE: remove kernel_setsockopt and kernel_getsockopt v2
Date: Thu, 21 May 2020 10:46:33 +0000 [thread overview]
Message-ID: <b7c7cf98999f4167b821f4425896e4e8@AcuMS.aculab.com> (raw)
In-Reply-To: <20200521091150.GA8401@lst.de>
From: 'Christoph Hellwig'
> Sent: 21 May 2020 10:12
...
> > I worried about whether getsockopt() should read the entire
> > user buffer first. SCTP needs the some of it often (including a
> > sockaddr_storage in one case), TCP needs it once.
> > However the cost of reading a few words is small, and a big
> > buffer probably needs setting to avoid leaking kernel
> > memory if the structure has holes or fields that don't get set.
> > Reading from userspace solves both issues.
>
> As mention in the thread on the last series: That was my first idea, but
> we have way to many sockopts, especially in obscure protocols that just
> hard code the size. The chance of breaking userspace in a way that can't
> be fixed without going back to passing user pointers to get/setsockopt
> is way to high to commit to such a change unfortunately.
Right the syscall stubs probably can't do it.
But the per-protocol ones can for the main protocols.
I posted a patch for SCTP yesterday that removes 800 lines
of source and 8k of object code.
Even that needs a horrid bodge for one request where the
length returned has to be less than the data copied!
David
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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
prev parent reply other threads:[~2020-05-21 10:46 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 19:54 remove kernel_setsockopt and kernel_getsockopt v2 Christoph Hellwig
2020-05-20 19:54 ` [PATCH 03/33] net: add sock_set_reuseaddr Christoph Hellwig
2020-05-20 19:54 ` [PATCH 10/33] net: add sock_set_rcvbuf Christoph Hellwig
2020-05-20 19:54 ` [PATCH 11/33] net: add sock_set_reuseport Christoph Hellwig
2020-05-20 19:54 ` [PATCH 12/33] tcp: add tcp_sock_set_cork Christoph Hellwig
2020-05-20 19:54 ` [PATCH 13/33] tcp: add tcp_sock_set_nodelay Christoph Hellwig
2020-05-20 19:54 ` [PATCH 14/33] tcp: add tcp_sock_set_quickack Christoph Hellwig
2020-05-20 19:54 ` [PATCH 15/33] tcp: add tcp_sock_set_syncnt Christoph Hellwig
[not found] ` <20200520195509.2215098-1-hch-jcswGhMUV9g@public.gmane.org>
2020-05-20 19:54 ` [PATCH 01/33] dlm: use the tcp version of accept_from_sock for sctp as well Christoph Hellwig
2020-05-20 19:54 ` [PATCH 02/33] net: remove kernel_getsockopt Christoph Hellwig
2020-05-20 19:54 ` [PATCH 04/33] net: add sock_no_linger Christoph Hellwig
2020-05-20 19:54 ` [PATCH 05/33] net: add sock_set_priority Christoph Hellwig
2020-05-20 19:54 ` [PATCH 06/33] net: add sock_set_sndtimeo Christoph Hellwig
2020-05-20 19:54 ` [PATCH 07/33] net: add sock_bindtoindex Christoph Hellwig
2020-05-20 19:54 ` [PATCH 08/33] net: add sock_enable_timestamps Christoph Hellwig
2020-05-20 19:54 ` [PATCH 09/33] net: add sock_set_keepalive Christoph Hellwig
2020-05-20 19:54 ` [PATCH 16/33] tcp: add tcp_sock_set_user_timeout Christoph Hellwig
2020-05-20 19:54 ` [PATCH 18/33] tcp: add tcp_sock_set_keepintvl Christoph Hellwig
2020-05-20 19:55 ` [PATCH 25/33] ipv6: add ip6_sock_set_v6only Christoph Hellwig
2020-05-20 19:55 ` [PATCH 31/33] sctp: add sctp_sock_set_nodelay Christoph Hellwig
[not found] ` <20200520195509.2215098-32-hch-jcswGhMUV9g@public.gmane.org>
2020-05-20 23:10 ` Marcelo Ricardo Leitner
2020-05-20 23:23 ` David Miller
[not found] ` <20200520.162355.2212209708127373208.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2020-05-20 23:39 ` Marcelo Ricardo Leitner
[not found] ` <20200520233913.GV2491-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2020-05-21 8:34 ` Christoph Hellwig
[not found] ` <20200521083442.GA7771-jcswGhMUV9g@public.gmane.org>
2020-05-21 9:06 ` David Laight
[not found] ` <0a6839ab0ba04fcf9b9c92784c9564aa-1XygrNkDbNvwg4NCKwmqgw@public.gmane.org>
2020-05-21 9:08 ` 'Christoph Hellwig'
2020-05-21 13:33 ` Marcelo Ricardo Leitner
[not found] ` <20200521133348.GX2491-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2020-05-21 13:57 ` Christoph Hellwig
2020-05-20 19:54 ` [PATCH 17/33] tcp: add tcp_sock_set_keepidle Christoph Hellwig
2020-05-20 19:54 ` [PATCH 19/33] tcp: add tcp_sock_set_keepcnt Christoph Hellwig
2020-05-20 19:54 ` [PATCH 20/33] ipv4: add ip_sock_set_tos Christoph Hellwig
2020-05-20 19:54 ` [PATCH 21/33] ipv4: add ip_sock_set_freebind Christoph Hellwig
2020-05-20 19:54 ` [PATCH 22/33] ipv4: add ip_sock_set_recverr Christoph Hellwig
2020-05-20 19:54 ` [PATCH 23/33] ipv4: add ip_sock_set_mtu_discover Christoph Hellwig
2020-05-20 19:55 ` [PATCH 24/33] ipv4: add ip_sock_set_pktinfo Christoph Hellwig
2020-05-20 19:55 ` [PATCH 26/33] ipv6: add ip6_sock_set_recverr Christoph Hellwig
2020-05-20 19:55 ` [PATCH 27/33] ipv6: add ip6_sock_set_addr_preferences Christoph Hellwig
2020-05-20 19:55 ` [PATCH 28/33] ipv6: add ip6_sock_set_recvpktinfo Christoph Hellwig
2020-05-20 19:55 ` [PATCH 29/33] rxrpc: add rxrpc_sock_set_min_security_level Christoph Hellwig
2020-05-20 19:55 ` [PATCH 30/33] tipc: call tsk_set_importance from tipc_topsrv_create_listener Christoph Hellwig
2020-05-20 19:55 ` [PATCH 32/33] net: add a new bind_add method Christoph Hellwig
2020-05-20 23:00 ` Marcelo Ricardo Leitner
[not found] ` <20200520230025.GT2491-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2020-05-21 8:42 ` Christoph Hellwig
2020-05-21 13:54 ` Marcelo Ricardo Leitner
2020-05-20 19:55 ` [PATCH 33/33] net: remove kernel_setsockopt Christoph Hellwig
[not found] ` <20200520195509.2215098-30-hch-jcswGhMUV9g@public.gmane.org>
2020-05-21 7:44 ` [PATCH 29/33] rxrpc: add rxrpc_sock_set_min_security_level David Howells
2020-05-21 8:01 ` remove kernel_setsockopt and kernel_getsockopt v2 David Laight
[not found] ` <138a17dfff244c089b95f129e4ea2f66-1XygrNkDbNvwg4NCKwmqgw@public.gmane.org>
2020-05-21 9:11 ` 'Christoph Hellwig'
2020-05-21 10:46 ` David Laight [this message]
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