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From: David Laight <David.Laight@ACULAB.COM>
To: 'Marcelo Ricardo Leitner' <marcelo.leitner@gmail.com>,
	'Christoph Hellwig' <hch@lst.de>
Cc: 'Eric Dumazet' <edumazet@google.com>,
	"'linux-nvme@lists.infradead.org'"
	<linux-nvme@lists.infradead.org>,
	"'linux-sctp@vger.kernel.org'" <linux-sctp@vger.kernel.org>,
	"'target-devel@vger.kernel.org'" <target-devel@vger.kernel.org>,
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	"'drbd-dev@lists.linbit.com'" <drbd-dev@lists.linbit.com>,
	"'linux-cifs@vger.kernel.org'" <linux-cifs@vger.kernel.org>,
	"'rds-devel@oss.oracle.com'" <rds-devel@oss.oracle.com>,
	"'linux-rdma@vger.kernel.org'" <linux-rdma@vger.kernel.org>,
	"'cluster-devel@redhat.com'" <cluster-devel@redhat.com>,
	'Alexey Kuznetsov' <kuznet@ms2.inr.ac.ru>,
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	'Jakub Kicinski' <kuba@kernel.org>,
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	'Neil Horman' <nhorman@tuxdriver.com>,
	'Hideaki YOSHIFUJI' <yoshfuji@linux-ipv6.org>,
	"'netdev@vger.kernel.org'" <netdev@vger.kernel.org>,
	'Vlad Yasevich' <vyasevich@gmail.com>,
	"'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>,
	'Jon Maloy' <jmaloy@redhat.com>,
	'Ying Xue' <ying.xue@windriver.com>,
	"'David S. Miller'" <davem@davemloft.net>,
	"'ocfs2-devel@oss.oracle.com'" <ocfs2-devel@oss.oracle.com>
Subject: RE: [PATCH 32/33] sctp: add sctp_sock_get_primary_addr
Date: Thu, 14 May 2020 13:27:46 +0000
Message-ID: <aff8f5ec8d6d44dbace63825af197086@AcuMS.aculab.com> (raw)
In-Reply-To: <c66e0309572345f5b0f32d078701f2d7@AcuMS.aculab.com>

From: David Laight
> Sent: 14 May 2020 13:30
> Subject: RE: [PATCH 32/33] sctp: add sctp_sock_get_primary_addr
> 
> From: David Laight
> > Sent: 14 May 2020 10:51
> > From: Marcelo Ricardo Leitner
> > > Sent: 13 May 2020 19:03
> > >
> > > On Wed, May 13, 2020 at 08:26:47AM +0200, Christoph Hellwig wrote:
> > > > Add a helper to directly get the SCTP_PRIMARY_ADDR sockopt from kernel
> > > > space without going through a fake uaccess.
> > >
> > > Same comment as on the other dlm/sctp patch.
> >
> > Wouldn't it be best to write sctp_[gs]etsockotp() that
> > use a kernel buffer and then implement the user-space
> > calls using a wrapper that does the copies to an on-stack
> > (or malloced if big) buffer.
> 
> Actually looking at __sys_setsockopt() it calls
> BPF_CGROUP_RUN_PROG_SETSOCKOPT() which (by the look of it)
> can copy the user buffer into malloc()ed memory and
> cause set_fs(KERNEL_DS) be called.
> 
> The only way to get rid of that set_fs() is to always
> have the buffer in kernel memory when the underlying
> setsockopt() code is called.

And having started to try coding __sys_setsockopt()
and then found the compat code I suspect that would
be a whole lot more sane if the buffer was in kernel
and it knew that at least (say) 64 bytes were allocated.

The whole compat_alloc_user_space() 'crap' could probably go.

Actually it looks like an application can avoid whatever
checks BPF_CGROUP_RUN_PROG_SETSOCKOPT() is trying to do
by using the 32bit compat ioctls.

	David

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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 02/33] net: add sock_set_linger 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
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
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
2020-05-16 15:11       ` David Laight
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 [this message]
2020-05-13  6:26 ` [PATCH 33/33] net: remove kernel_getsockopt Christoph Hellwig
2020-05-13 13:13 ` [PATCH 29/33] rxrpc_sock_set_min_security_level David Howells
2020-05-14 10:29   ` Christoph Hellwig
2020-05-15 15:13   ` David Howells
2020-05-13 13:17 ` [PATCH 21/33] ipv4: add ip_sock_set_mtu_discover David Howells
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
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
2020-05-14  6:27   ` Christoph Hellwig
2020-05-14  8:29   ` David Laight
2020-05-14 10:18     ` Christoph Hellwig
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
2020-05-14 20:03         ` David Miller
2020-05-15  8:14           ` David Laight
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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