Re: [PATCH net-next 2/3] vsock: convert to getsockopt_iter

David Laight
2026-05-01T21:21:08Z

On Fri, 1 May 2026 10:32:44 -0700
Bobby Eshleman <bobbyeshleman@gmail.com> wrote:

> On Fri, May 01, 2026 at 08:52:52AM -0700, Breno Leitao wrote:
> > Convert AF_VSOCK's getsockopt implementation to use the new
> > getsockopt_iter callback with sockopt_t. The single
> > vsock_connectible_getsockopt() callback is shared by both
> > vsock_stream_ops and vsock_seqpacket_ops, so both proto_ops are
> > updated to use .getsockopt_iter.
> >
> > Key changes:
> > - Replace (char __user *optval, int __user *optlen) with sockopt_t *opt
> > - Use opt->optlen for buffer length (input) and returned size (output)
> > - Use copy_to_iter() instead of put_user()/copy_to_user()
> >
> > Signed-off-by: Breno Leitao <leitao@debian.org>
> > ---
> > net/vmw_vsock/af_vsock.c | 16 +++++++---------
> > 1 file changed, 7 insertions(+), 9 deletions(-)
> >
> > diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
> > index 44037b066a5ff..d4a97eeb596e6 100644
> > --- a/net/vmw_vsock/af_vsock.c
> > +++ b/net/vmw_vsock/af_vsock.c
> > @@ -155,6 +155,7 @@
> > #include <linux/random.h>
> > #include <linux/skbuff.h>
> > #include <linux/smp.h>
> > +#include <linux/uio.h>
> > #include <linux/socket.h>
> > #include <linux/stddef.h>
> > #include <linux/sysctl.h>
> > @@ -2091,8 +2092,7 @@ static int vsock_connectible_setsockopt(struct socket *sock,
> >
> > static int vsock_connectible_getsockopt(struct socket *sock,
> > int level, int optname,
> > - char __user *optval,
> > - int __user *optlen)
> > + sockopt_t *opt)
> > {
> > struct sock *sk = sock->sk;
> > struct vsock_sock *vsk = vsock_sk(sk);
> > @@ -2110,8 +2110,7 @@ static int vsock_connectible_getsockopt(struct socket *sock,
> > if (level != AF_VSOCK)
> > return -ENOPROTOOPT;
> >
> > - if (get_user(len, optlen))
> > - return -EFAULT;
> > + len = opt->optlen;
> >
> > memset(&v, 0, sizeof(v));
> >
> > @@ -2142,11 +2141,10 @@ static int vsock_connectible_getsockopt(struct socket *sock,
> > return -EINVAL;
> > if (len > lv)
> > len = lv;
> > - if (copy_to_user(optval, &v, len))
> > + if (copy_to_iter(&v, len, &opt->iter_out) != len)

I'd wrap that as copy_to_sockopt(&v, len, opt).
or to make the edits easier: copy_to_sockopt(opt, &v, len).
Then if someone decides to change the implementation none of the call
sites need changing.

-- David

> > return -EFAULT;
> >
> > - if (put_user(len, optlen))
> > - return -EFAULT;
> > + opt->optlen = len;
> >
> > return 0;
> > }
> > @@ -2631,7 +2629,7 @@ static const struct proto_ops vsock_stream_ops = {
> > .listen = vsock_listen,
> > .shutdown = vsock_shutdown,
> > .setsockopt = vsock_connectible_setsockopt,
> > - .getsockopt = vsock_connectible_getsockopt,
> > + .getsockopt_iter = vsock_connectible_getsockopt,
> > .sendmsg = vsock_connectible_sendmsg,
> > .recvmsg = vsock_connectible_recvmsg,
> > .mmap = sock_no_mmap,
> > @@ -2653,7 +2651,7 @@ static const struct proto_ops vsock_seqpacket_ops = {
> > .listen = vsock_listen,
> > .shutdown = vsock_shutdown,
> > .setsockopt = vsock_connectible_setsockopt,
> > - .getsockopt = vsock_connectible_getsockopt,
> > + .getsockopt_iter = vsock_connectible_getsockopt,
> > .sendmsg = vsock_connectible_sendmsg,
> > .recvmsg = vsock_connectible_recvmsg,
> > .mmap = sock_no_mmap,
> >
> > --
> > 2.52.0
> >
>
> Reviewed-by: Bobby Eshleman <bobbyeshleman@meta.com>
>