netdev - Re: [PATCH bpf-next 0/2] bpf: Support variable offset stack access from helpers

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Date:   Mon, 1 Apr 2019 17:23:14 +0000
From:   Alexei Starovoitov <ast@...com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andrey Ignatov <rdna@...com>
CC:     Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next 0/2] bpf: Support variable offset stack access
 from helpers

On 4/1/19 9:09 AM, Daniel Borkmann wrote:
> On 03/29/2019 08:10 PM, Alexei Starovoitov wrote:
>> On Thu, Mar 28, 2019 at 6:02 PM Andrey Ignatov <rdna@...com> wrote:
>>>
>>> The patch set adds support for stack access with variable offset from helpers.
>>>
>>> Patch 1 is the main patch in the set and provides more details.
>>> Patch 2 adds selftests for new functionality.
>>
>> Applied. Thanks
> 
> Hmm, I think this series needs more work unfortunately. The selftests are only
> checking root-only programs, which is way to little. For !root we do the spectre
> masking for map and stack ALU, and that hasn't been adapted here, so it will
> generate a wrong masking for runtime since it doesn't take variable part into
> account. Andrey, please take a look.

right. may be we should allow this for root only then?