netdev - Re: [PATCH bpf-next V9 1/3] bpf: new helper to obtain namespace data from current task

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Date:   Tue, 3 Sep 2019 20:36:49 +0000
From:   Yonghong Song <yhs@...com>
To:     Carlos Antonio Neira Bustos <cneirabustos@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        "brouer@...hat.com" <brouer@...hat.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next V9 1/3] bpf: new helper to obtain namespace data
 from current task



On 9/3/19 11:45 AM, Carlos Antonio Neira Bustos wrote:
> Hi Yonghong,
> 
>>> Yes, the samples/bpf test case can be removed.
>>> Could you create a selftest with tracpoint net/netif_receive_skb, which
>>> also uses the proposed helper? net/netif_receive_skb will happen in
>>> interrupt context and it should catch the issue as well if
>>> filename_lookup still get called in interrupt context.
>>
> For this one scenario I just created another selftest with the only difference
> that the tracepoint is /net/netif_receive_skb so this fails with -EPERM.
> Is that enough?.

This should be fine.

> 
> I have made this comment on include/uapi/linux/bpf.h, maybe is too terse?
> 
> struct bpf_pidns_info {
> 	__u32 dev;	/* dev_t from /proc/self/ns/pid inode */
> 	__u32 nsid;
> 	__u32 tgid;
> 	__u32 pid;
> };

Let us keep the above for now. I may have further comments based on
your test code which uses "dev".

> 
> I'm only missing clearing out those questions to be ready to submit v11 of this patch.

Please go ahead to submit the new version.

Thanks.