From: David Laight <David.Laight-ZS65k/vG3HxXrIkS9f7CXA@public.gmane.org>
To: 'David Howells'
<dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Cc: Marcelo Ricardo Leitner
<marcelo.leitner-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Eric Dumazet <edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
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<cluster-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Alexey Kuznetsov <kuznet-v/Mj1YrvjDBInbfyfbPRSQ@public.gmane.org>,
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<linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Jakub Kicinski <kuba-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
ceph-devel-u79uwXL29TY@public.gmane.org
Subject: RE: [PATCH 27/33] sctp: export sctp_setsockopt_bindx
Date: Sat, 16 May 2020 15:11:40 +0000 [thread overview]
Message-ID: <05d946ae948946158dbfcbc07939b799@AcuMS.aculab.com> (raw)
In-Reply-To: <129070.1589556002-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
From: David Howells
> Sent: 15 May 2020 16:20
> Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org> wrote:
>
> > > The advantage on using kernel_setsockopt here is that sctp module will
> > > only be loaded if dlm actually creates a SCTP socket. With this
> > > change, sctp will be loaded on setups that may not be actually using
> > > it. It's a quite big module and might expose the system.
> >
> > True. Not that the intent is to kill kernel space callers of setsockopt,
> > as I plan to remove the set_fs address space override used for it.
>
> For getsockopt, does it make sense to have the core kernel load optval/optlen
> into a buffer before calling the protocol driver? Then the driver need not
> see the userspace pointer at all.
>
> Similar could be done for setsockopt - allocate a buffer of the size requested
> by the user inside the kernel and pass it into the driver, then copy the data
> back afterwards.
Yes, it also simplifies all the compat code.
And there is a BPF test in setsockopt that also wants to
pass on a kernel buffer.
I'm willing to sit and write the patch.
Quoting from a post I made later on Friday.
Basically:
This patch sequence (to be written) does the following:
Patch 1: Change __sys_setsockopt() to allocate a kernel buffer,
copy the data into it then call set_fs(KERNEL_DS).
An on-stack buffer (say 64 bytes) will be used for
small transfers.
Patch 2: The same for __sys_getsockopt().
Patch 3: Compat setsockopt.
Patch 4: Compat getsockopt.
Patch 5: Remove the user copies from the global socket options code.
Patches 6 to n-1; Remove the user copies from the per-protocol code.
Patch n: Remove the set_fs(KERNEL_DS) from the entry points.
This should be bisectable.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2020-05-16 15:11 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-13 6:26 remove kernel_setsockopt and kernel_getsockopt Christoph Hellwig
2020-05-13 6:26 ` [PATCH 01/33] net: add sock_set_reuseaddr Christoph Hellwig
2020-05-13 6:26 ` [PATCH 03/33] net: add sock_set_priority Christoph Hellwig
2020-05-13 6:26 ` [PATCH 04/33] net: add sock_set_sndtimeo Christoph Hellwig
2020-05-13 6:26 ` [PATCH 05/33] net: add sock_bindtoindex Christoph Hellwig
2020-05-13 6:26 ` [PATCH 06/33] net: add sock_set_timestamps Christoph Hellwig
2020-05-13 6:26 ` [PATCH 07/33] net: add sock_set_keepalive Christoph Hellwig
2020-05-13 6:26 ` [PATCH 08/33] net: add sock_set_rcvbuf Christoph Hellwig
2020-05-13 6:26 ` [PATCH 09/33] net: add sock_set_reuseport Christoph Hellwig
2020-05-13 6:26 ` [PATCH 10/33] tcp: add tcp_sock_set_cork Christoph Hellwig
2020-05-13 6:26 ` [PATCH 11/33] tcp: tcp_sock_set_nodelay Christoph Hellwig
2020-05-13 12:51 ` Jason Gunthorpe
2020-05-13 6:26 ` [PATCH 12/33] tcp: add tcp_sock_set_quickack Christoph Hellwig
2020-05-13 6:26 ` [PATCH 13/33] tcp: add tcp_sock_set_syncnt Christoph Hellwig
[not found] ` <20200513062649.2100053-1-hch-jcswGhMUV9g@public.gmane.org>
2020-05-13 6:26 ` [PATCH 02/33] net: add sock_set_linger Christoph Hellwig
2020-05-13 6:26 ` [PATCH 14/33] tcp: add tcp_sock_set_user_timeout Christoph Hellwig
2020-05-13 6:26 ` [PATCH 15/33] tcp: add tcp_sock_set_keepidle Christoph Hellwig
2020-05-13 6:26 ` [PATCH 16/33] tcp: add tcp_sock_set_keepintvl Christoph Hellwig
2020-05-13 6:26 ` [PATCH 17/33] tcp: add tcp_sock_set_keepcnt Christoph Hellwig
2020-05-13 6:26 ` [PATCH 18/33] ipv4: add ip_sock_set_tos Christoph Hellwig
2020-05-13 6:26 ` [PATCH 19/33] ipv4: add ip_sock_set_freebind Christoph Hellwig
2020-05-13 6:26 ` [PATCH 20/33] ipv4: add ip_sock_set_recverr Christoph Hellwig
2020-05-13 21:00 ` Joe Perches
2020-05-14 10:30 ` Christoph Hellwig
2020-05-14 11:51 ` Joe Perches
[not found] ` <9992a1fe768a0b1e9bb9470d2728ba25dbe042db.camel-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org>
2020-05-20 14:18 ` Christoph Hellwig
2020-05-13 6:26 ` [PATCH 21/33] ipv4: add ip_sock_set_mtu_discover Christoph Hellwig
2020-05-13 6:26 ` [PATCH 22/33] ipv6: add ip6_sock_set_v6only Christoph Hellwig
2020-05-13 6:26 ` [PATCH 23/33] ipv6: add ip6_sock_set_recverr Christoph Hellwig
2020-05-13 6:26 ` [PATCH 24/33] ipv6: add ip6_sock_set_addr_preferences Christoph Hellwig
2020-05-13 6:26 ` [PATCH 25/33] ipv6: add ip6_sock_set_recvpktinfo Christoph Hellwig
2020-05-13 6:26 ` [PATCH 26/33] sctp: lift copying in addrs into sctp_setsockopt Christoph Hellwig
2020-05-13 6:26 ` [PATCH 27/33] sctp: export sctp_setsockopt_bindx Christoph Hellwig
2020-05-13 18:00 ` Marcelo Ricardo Leitner
2020-05-14 6:28 ` Christoph Hellwig
2020-05-14 8:23 ` David Laight
2020-05-14 10:40 ` is it ok to always pull in sctp for dlm, was: " Christoph Hellwig
2020-05-14 14:24 ` David Teigland
2020-05-15 15:20 ` David Howells
2020-05-15 15:24 ` Christoph Hellwig
2020-05-16 15:21 ` David Laight
[not found] ` <129070.1589556002-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2020-05-16 15:11 ` David Laight [this message]
2020-05-16 15:36 ` [Ocfs2-devel] " Matthew Wilcox
2020-05-17 8:48 ` David Laight
2020-05-13 6:26 ` [PATCH 28/33] sctp: add sctp_sock_set_nodelay Christoph Hellwig
2020-05-13 6:26 ` [PATCH 29/33] rxrpc_sock_set_min_security_level Christoph Hellwig
2020-05-13 6:26 ` [PATCH 30/33] tipc: call tsk_set_importance from tipc_topsrv_create_listener Christoph Hellwig
2020-05-13 6:26 ` [PATCH 31/33] net: remove kernel_setsockopt Christoph Hellwig
2020-05-13 6:26 ` [PATCH 32/33] sctp: add sctp_sock_get_primary_addr Christoph Hellwig
2020-05-13 18:03 ` Marcelo Ricardo Leitner
2020-05-14 9:51 ` David Laight
2020-05-14 12:30 ` David Laight
2020-05-14 13:27 ` David Laight
2020-05-13 6:26 ` [PATCH 33/33] net: remove kernel_getsockopt Christoph Hellwig
[not found] ` <20200513062649.2100053-30-hch-jcswGhMUV9g@public.gmane.org>
2020-05-13 13:13 ` [PATCH 29/33] rxrpc_sock_set_min_security_level David Howells
2020-05-14 10:29 ` Christoph Hellwig
[not found] ` <20200514102919.GA12680-jcswGhMUV9g@public.gmane.org>
2020-05-15 15:13 ` David Howells
2020-05-13 13:17 ` [PATCH 21/33] ipv4: add ip_sock_set_mtu_discover David Howells
[not found] ` <3123898.1589375861-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2020-05-14 6:26 ` Christoph Hellwig
2020-05-15 15:15 ` David Howells
2020-05-13 13:24 ` [PATCH 20/33] ipv4: add ip_sock_set_recverr David Howells
[not found] ` <20200513062649.2100053-24-hch-jcswGhMUV9g@public.gmane.org>
2020-05-13 13:25 ` [PATCH 23/33] ipv6: add ip6_sock_set_recverr David Howells
2020-05-13 13:27 ` [PATCH 06/33] net: add sock_set_timestamps David Howells
2020-05-13 17:38 ` remove kernel_setsockopt and kernel_getsockopt Joe Perches
[not found] ` <ecc165c33962d964d518c80de605af632eee0474.camel-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org>
2020-05-14 6:27 ` Christoph Hellwig
2020-05-14 8:29 ` David Laight
2020-05-14 10:18 ` Christoph Hellwig
[not found] ` <20200514101838.GA12548-jcswGhMUV9g@public.gmane.org>
2020-05-14 10:26 ` David Laight
2020-05-14 10:34 ` 'Christoph Hellwig'
2020-05-14 11:11 ` David Laight
2020-05-14 19:35 ` [Ocfs2-devel] " Matthew Wilcox
[not found] ` <a76440f7305c4653877ff2abff499f4e-1XygrNkDbNvwg4NCKwmqgw@public.gmane.org>
2020-05-14 20:03 ` David Miller
[not found] ` <20200514.130357.1683454520750761365.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2020-05-15 8:14 ` David Laight
[not found] ` <756758e8f0e34e2e97db470609f5fbba-1XygrNkDbNvwg4NCKwmqgw@public.gmane.org>
2020-05-14 19:57 ` David Miller
2020-05-13 18:45 ` Sagi Grimberg
2020-05-13 19:12 ` David Miller
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