[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] Re: [PATCH] tun: orphan an skb on tx
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH] tun: orphan an skb on tx |
Date: |
Tue, 13 Apr 2010 23:25:48 +0300 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Tue, Apr 13, 2010 at 08:31:03PM +0200, Eric Dumazet wrote:
> Le mardi 13 avril 2010 à 20:39 +0300, Michael S. Tsirkin a écrit :
>
> > > When a socket with inflight tx packets is closed, we dont block the
> > > close, we only delay the socket freeing once all packets were delivered
> > > and freed.
> > >
> >
> > Which is wrong, since this is under userspace control, so you get
> > unkillable processes.
> >
>
> We do not get unkillable processes, at least with sockets I was thinking
> about (TCP/UDP ones).
>
> Maybe tun sockets can behave the same ?
Looks like that's what my patch does: ip_rcv seems to call
skb_orphan too.
> Herbert Acked your patch, so I guess its OK, but I think it can be
> dangerous.
> Anyway my feeling is that we try to add various mechanisms to keep a
> hostile user flooding another one.
>
> For example, UDP got memory accounting quite recently, and we added
> socket backlog limits very recently. It was considered not needed few
> years ago.
>
- [Qemu-devel] [PATCH] tun: orphan an skb on tx, Michael S. Tsirkin, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Herbert Xu, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Jan Kiszka, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Eric Dumazet, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Jan Kiszka, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Michael S. Tsirkin, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Eric Dumazet, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx,
Michael S. Tsirkin <=
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Eric Dumazet, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Michael S. Tsirkin, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Herbert Xu, 2010/04/13
- [Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, David Miller, 2010/04/14
[Qemu-devel] Re: [PATCH] tun: orphan an skb on tx, Michael S. Tsirkin, 2010/04/21