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

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Date:   Fri, 1 Dec 2017 04:54:39 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Kees Cook <keescook@...omium.org>
Cc:     Shmulik Ladkani <shmulik.ladkani@...il.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        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 03:48:59AM +0000, Al Viro wrote:

> Something similar to get_prog_path_type() above might make for a usable
> primitive, IMO...

Incidentally, bpf_obj_get_user()/bpf_obj_do_get() should just use
user_path(), rather than wanking with getname()+kern_path(pname->name)+putname().
Note that kern_path() will do getname_kernel() to get struct pathname...

Would cause problems for tracepoints in there, though.  And that, BTW,
is precisely why I don't want tracepoints in core VFS, TYVM - makes
restructuring the code harder...