netdev - Re: [RFC 0/3] bpf: Add d

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Date:   Tue, 7 Apr 2020 10:53:21 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>, Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        David Miller <davem@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Wenbo Zhang <ethercflow@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Andrii Nakryiko <andriin@...com>, bgregg@...flix.com
Subject: Re: [RFC 0/3] bpf: Add d_path helper

On Mon, Apr 06, 2020 at 06:10:52PM -0700, Alexei Starovoitov wrote:
> On Mon, Apr 06, 2020 at 11:09:18AM +0200, Jiri Olsa wrote:
> > 
> > is there any way we could have d_path functionality (even
> > reduced and not working for all cases) that could be used
> > or called like that?
> 
> I agree with Al. This helper cannot be enabled for all of bpf tracing.
> We have to white list its usage for specific callsites only.
> May be all of lsm hooks are safe. I don't know yet. This has to be
> analyzed carefully. Every hook. One by one.
> in_task() isn't really a solution.

ok, I thought of white list and it seemed too much to me,
but there's probably no other way

jirka

> 
> At the same time I agree that such helper is badly needed.
> Folks have been requesting it for long time.
>