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

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Date:   Mon, 4 Dec 2017 10:57:50 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Al Viro <viro@...IV.linux.org.uk>
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 12/02/2017 07:48 PM, Al Viro wrote:
> 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.

I pulled vfs.git#untested.mkobj into my local tree and ran tests for both
progs and maps on it, all went fine and the patch looks good to me.

For 'bpf_obj_do_pin(): switch to vfs_mkobj(), quit abusing ->mknod()' when
you push the fix to Linus, feel free to add:

Acked-by: Daniel Borkmann <daniel@...earbox.net>

Thanks for your help, Al!