From: Al Viro <viro@zeniv.linux.org.uk>
To: Christoph Hellwig <hch@lst.de>
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Eric Dumazet <edumazet@google.com>,
linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, bpf@vger.kernel.org,
netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
linux-sctp@vger.kernel.org, linux-hams@vger.kernel.org,
linux-bluetooth@vger.kernel.org,
bridge@lists.linux-foundation.org, linux-can@vger.kernel.org,
dccp@vger.kernel.org, linux-decnet-user@lists.sourceforge.net,
linux-wpan@vger.kernel.org, linux-s390@vger.kernel.org,
mptcp@lists.01.org, lvs-devel@vger.kernel.org,
rds-devel@oss.oracle.com, linux-afs@lists.infradead.org,
tipc-discussion@lists.sourceforge.net, linux-x25@vger.kernel.org
Subject: Re: [PATCH 02/24] bpfilter: fix up a sparse annotation
Date: Tue, 21 Jul 2020 06:28:21 +0100 [thread overview]
Message-ID: <20200721052821.GS2786714@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200721052326.GA10071@lst.de>
On Tue, Jul 21, 2020 at 07:23:26AM +0200, Christoph Hellwig wrote:
> On Tue, Jul 21, 2020 at 04:40:16AM +0200, Luc Van Oostenryck wrote:
> > > req.pid = current->pid;
> > > req.cmd = optname;
> > > - req.addr = (long __force __user)optval;
> > > + req.addr = (__force long)optval;
> >
> > For casts to integers, even '__force' is not needed (since integers
> > can't be dereferenced, the concept of address-space is meaningless
> > for them, so it's never useful to warn when it's dropped and
> > '__force' is thus not needed).
>
> That's what I thought. but if I remove it here I actually do get a
> warning:
>
> CHECK net/bpfilter/bpfilter_kern.c
> net/bpfilter/bpfilter_kern.c:52:21: warning: cast removes address space '__user' of expression
Cast to unsigned long. Or to uintptr_t if you want to be fancy.
next prev parent reply other threads:[~2020-07-21 5:29 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-20 12:47 get rid of the address_space override in setsockopt Christoph Hellwig
2020-07-20 12:47 ` [PATCH 01/24] bpfilter: reject kernel addresses Christoph Hellwig
2020-07-20 12:47 ` [PATCH 02/24] bpfilter: fix up a sparse annotation Christoph Hellwig
2020-07-21 2:40 ` Luc Van Oostenryck
2020-07-21 5:23 ` Christoph Hellwig
2020-07-21 5:28 ` Al Viro [this message]
2020-07-20 12:47 ` [PATCH 03/24] net: add a new sockptr_t type Christoph Hellwig
2020-07-20 16:37 ` Eric Biggers
2020-07-20 17:43 ` Christoph Hellwig
2020-07-20 17:55 ` Eric Biggers
2020-07-22 7:56 ` Christoph Hellwig
2020-07-21 9:55 ` David Laight
2020-07-21 10:14 ` David Laight
2020-07-20 12:47 ` [PATCH 04/24] net: switch copy_bpf_fprog_from_user to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 05/24] net: switch sock_setbindtodevice " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 06/24] net: switch sock_set_timeout " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 07/24] " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 08/24] net/xfrm: switch xfrm_user_policy " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 09/24] netfilter: remove the unused user argument to do_update_counters Christoph Hellwig
2020-07-20 12:47 ` [PATCH 10/24] netfilter: switch xt_copy_counters to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 11/24] netfilter: switch nf_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt " Christoph Hellwig
2020-07-21 8:36 ` David Laight
2020-07-22 8:00 ` 'Christoph Hellwig'
2020-07-22 8:01 ` 'Christoph Hellwig'
2020-07-20 12:47 ` [PATCH 13/24] net/ipv4: switch ip_mroute_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 14/24] net/ipv4: merge ip_options_get and ip_options_get_from_user Christoph Hellwig
2020-07-20 12:47 ` [PATCH 15/24] net/ipv4: switch do_ip_setsockopt to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 16/24] net/ipv6: switch ip6_mroute_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 17/24] net/ipv6: split up ipv6_flowlabel_opt Christoph Hellwig
2020-07-20 12:47 ` [PATCH 18/24] net/ipv6: switch ipv6_flowlabel_opt to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 19/24] net/ipv6: factor out a ipv6_set_opt_hdr helper Christoph Hellwig
2020-07-20 12:47 ` [PATCH 20/24] net/ipv6: switch do_ipv6_setsockopt to sockptr_t Christoph Hellwig
2020-07-20 12:47 ` [PATCH 21/24] net/udp: switch udp_lib_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 22/24] net/tcp: switch ->md5_parse " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 23/24] net/tcp: switch do_tcp_setsockopt " Christoph Hellwig
2020-07-20 12:47 ` [PATCH 24/24] net: pass a sockptr_t into ->setsockopt Christoph Hellwig
2020-07-20 14:19 ` Stefan Schmidt
2020-07-20 23:20 ` David Miller
2020-07-22 8:26 ` [MPTCP] " Matthieu Baerts
2020-07-20 16:38 ` get rid of the address_space override in setsockopt Eric Biggers
2020-07-20 17:43 ` Christoph Hellwig
2020-07-20 20:47 ` Alexei Starovoitov
2020-07-22 7:56 ` Christoph Hellwig
2020-07-22 17:09 ` Alexei Starovoitov
2020-07-21 9:38 ` David Laight
2020-07-22 8:06 ` 'Christoph Hellwig'
2020-07-22 8:21 ` David Laight
2020-07-21 10:26 ` David Laight
2020-07-22 8:07 ` 'Christoph Hellwig'
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