linux-kernel - Re: Can Not Send Netlink Messages with Unshare(CLONE

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Date:   Thu, 17 Nov 2022 16:44:45 +0800
From:   Hang An <anhang610@...il.com>
To:     Ozgur <ozgurk@...e.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Can Not Send Netlink Messages with Unshare(CLONE_NEWNET)

Thanks for your information.

Ozgur <ozgurk@...e.org> 于2022年11月17日周四 16:35写道：
>
> On Thu, Nov 17, 2022 at 11:55 AM Hang An <anhang610@...il.com> wrote:
> >
> > Hi,
> > A process can not send netlink messages(errno is ECONNREFUSED) after
> > running unshare(CLONE_NEWNET).
> >
> > Part of the call stack when process failed:
> > netlink_sendmsg
> > netlink_unicast
> > netlink_getsockbyportid
> > netlink_lookup(return NULL)
> >
> > The corresponding pseudocode is shown below:
> > unshare(CLONE_NEWNET) ;
> > res_socket = syscall(__NR_socket, 0x10ul, 3ul, 8);
> > syscall(__NR_sendmsg, res_socket, msghdr, 0ul);
> >
> > I can't understand this situation. Is this a bug or special design?
>
> Hello,
>
> you have emailed a public linux-kernel list, so this list mainly focus
> for development. maybe you should use bugzilla(1) to get answers to
> your questions or you should ask question mentioned own kernel
> subsystem (2).
>
> 1. https://bugzilla.kernel.org/
> 2. Network Subsystem | netdev@...r.kernel.org
>
> Regards
>
> >
> > Thanks.