netdev - Re: [PATCH v2 bpf-next 0/3] fix BTF verification size resolution

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Date:   Fri, 12 Jul 2019 14:59:53 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Yonghong Song <yhs@...com>, Andrii Nakryiko <andriin@...com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>
Cc:     "andrii.nakryiko@...il.com" <andrii.nakryiko@...il.com>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH v2 bpf-next 0/3] fix BTF verification size resolution

On 07/12/2019 08:03 AM, Yonghong Song wrote:
> On 7/10/19 11:53 PM, Andrii Nakryiko wrote:
>> BTF size resolution logic isn't always resolving type size correctly, leading
>> to erroneous map creation failures due to value size mismatch.
>>
>> This patch set:
>> 1. fixes the issue (patch #1);
>> 2. adds tests for trickier cases (patch #2);
>> 3. and converts few test cases utilizing BTF-defined maps, that previously
>>     couldn't use typedef'ed arrays due to kernel bug (patch #3).
>>
>> Patch #1 can be applied against bpf tree, but selftest ones (#2 and #3) have
>> to go against bpf-next for now.
> 
> Why #2 and #3 have to go to bpf-next? bpf tree also accepts tests, 
> AFAIK. Maybe leave for Daniel and Alexei to decide in this particular case.

Yes, corresponding test cases for fixes are also accepted for bpf tree, thanks.

>> Andrii Nakryiko (3):
>>    bpf: fix BTF verifier size resolution logic
>>    selftests/bpf: add trickier size resolution tests
>>    selftests/bpf: use typedef'ed arrays as map values
> 
> Looks good to me. Except minor comments in patch 1/3, Ack the series.
> Acked-by: Yonghong Song <yhs@...com>
> 
>>
>>   kernel/bpf/btf.c                              | 14 ++-
>>   .../bpf/progs/test_get_stack_rawtp.c          |  3 +-
>>   .../bpf/progs/test_stacktrace_build_id.c      |  3 +-
>>   .../selftests/bpf/progs/test_stacktrace_map.c |  2 +-
>>   tools/testing/selftests/bpf/test_btf.c        | 88 +++++++++++++++++++
>>   5 files changed, 102 insertions(+), 8 deletions(-)
>>