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

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Message-ID: <fe3f5b79-9725-a858-c641-b50623f1000b@iogearbox.net>
Date:   Mon, 1 Apr 2019 18:09:09 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     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 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.