netdev - Re: [PATCH bpf] bpf: relax inode permission check for retrieving bpf program

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Date:   Thu, 16 May 2019 17:53:34 -0700
From:   Chenbo Feng <chenbofeng.kernel@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Chenbo Feng <fengc@...gle.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        Maciej Żenczykowski <maze@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH bpf] bpf: relax inode permission check for retrieving bpf
 program


On 5/16/19 11:35 AM, Alexei Starovoitov wrote:
> On Tue, May 14, 2019 at 7:43 PM Chenbo Feng <fengc@...gle.com> wrote:
>> For iptable module to load a bpf program from a pinned location, it
>> only retrieve a loaded program and cannot change the program content so
>> requiring a write permission for it might not be necessary.
>> Also when adding or removing an unrelated iptable rule, it might need to
>> flush and reload the xt_bpf related rules as well and triggers the inode
>> permission check. It might be better to remove the write premission
>> check for the inode so we won't need to grant write access to all the
>> processes that flush and restore iptables rules.
>>
>> Signed-off-by: Chenbo Feng <fengc@...gle.com>
> Applied. The fix makes sense to me.

Thanks for accepting it Alexei, could you also queue it up for the 
stable as well?


Chenbo Feng