linux-kernel - Re: [PATCH] net: sched: Fix memory exposure from short TCA_U32

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Message-ID: <20180829213321.GA19965@ZenIV.linux.org.uk>
Date:   Wed, 29 Aug 2018 22:33:22 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jiri Pirko <jiri@...nulli.us>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: sched: Fix memory exposure from short TCA_U32_SEL

On Wed, Aug 29, 2018 at 12:07:09PM -0700, Cong Wang wrote:
> On Mon, Aug 27, 2018 at 5:03 PM Al Viro <viro@...iv.linux.org.uk> wrote:
> >
> > On Mon, Aug 27, 2018 at 02:31:41PM -0700, Cong Wang wrote:
> > > > I cant think of any challenges. Cong/Jiri? Would it require development
> > > > time classifiers/actions/qdiscs to sit in that directory (I suspect you
> > > > dont want them in include/net).
> > > > BTW, the idea of improving grep-ability of the code by prefixing the
> > > > ops appropriately makes sense. i.e we should have ops->cls_init,
> > > > ops->act_init etc.
> > >
> > > Hmm? Isn't struct tcf_proto_ops used and must be provided
> > > by each tc filter module? How does it work if you move it into
> > > net/sched/* for out-of-tree modules? Are they supposed to
> > > include "..../net/sched/tcf_proto.h"?? Or something else?
> >
> > If you care about out-of-tree modules, that could easily live in
> > include/net/tcf_proto.h, provided that it's not pulled by indirect
> > includes into hell knows how many places.  Try
> > make allmodconfig
> > make >/dev/null 2>&1
> > find -name '.*.cmd'|xargs grep sch_generic.h
> >
> > That finds 2977 files here, most of them having nothing to do with
> > net/sched.
> 
> 
> Moving it to include/net/tcf_proto.h is fine, as out-of-tree modules
> can still compile by modifying the included header path.
> 
> include/net/pkt_cls.h might be a choice here too.

Nowhere near as massive exposure (123 files vs. 2977), but still - do
ethernet drivers need that?  Because that's 77 out of 123...