linux-kernel - Re: netfilter: xt_bpf: Fix XT_BPF_MODE_FD_PINNED mode of 'xt_bpf_info

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Date:   Sat, 2 Dec 2017 18:48:50 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Kees Cook <keescook@...omium.org>,
        Shmulik Ladkani <shmulik.ladkani@...il.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Thomas Garnier <thgarnie@...gle.com>,
        Jann Horn <jannh@...gle.com>
Subject: Re: netfilter: xt_bpf: Fix XT_BPF_MODE_FD_PINNED mode of
 'xt_bpf_info_v1'

On Fri, Dec 01, 2017 at 09:47:00PM +0100, Daniel Borkmann wrote:

> > Might want to replace security_path_mknod() with something saner, while we are
> > at it.
> > 
> > Objections?
> 
> No, thanks for looking into this, and sorry for this fugly hack! :( Not
> that this doesn't make it any better, but I think back then I took it
> over from mqueue implementation ... should have known better and looking
> into making this generic instead, sigh. The above looks good to me, so
> no objections from my side and thanks for working on it!
> 
> > PS: mqueue.c would also benefit from such primitive - do_create() there would
> > simply pass attr as callback's argument into vfs_mkobj(), with callback being
> > the guts of mqueue_create()...

OK...  See vfs.git#untested.mkobj; it really needs testing, though - mq_open(2)
passes LTP tests, but that's not saying much, and BPF side is completely
untested.