From: Daniel Borkmann <daniel@iogearbox.net>
To: Gilad Reti <gilad.reti@gmail.com>, KP Singh <kpsingh@kernel.org>
Cc: bpf <bpf@vger.kernel.org>, Shuah Khan <shuah@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
linux-kselftest@vger.kernel.org,
Networking <netdev@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] selftests/bpf: add verifier test for PTR_TO_MEM spill
Date: Tue, 12 Jan 2021 16:43:19 +0100 [thread overview]
Message-ID: <60034a79-573f-125c-76b0-17e04941a155@iogearbox.net> (raw)
In-Reply-To: <CANaYP3G_39cWx_L5Xs3tf1k4Vj9JSHcsr+qzNQN-dcY3qvT8Yg@mail.gmail.com>
On 1/12/21 4:35 PM, Gilad Reti wrote:
> On Tue, Jan 12, 2021 at 4:56 PM KP Singh <kpsingh@kernel.org> wrote:
>> On Tue, Jan 12, 2021 at 10:16 AM Gilad Reti <gilad.reti@gmail.com> wrote:
>>>
>>> Add test to check that the verifier is able to recognize spilling of
>>> PTR_TO_MEM registers.
>>
>> It would be nice to have some explanation of what the test does to
>> recognize the spilling of the PTR_TO_MEM registers in the commit
>> log as well.
>>
>> Would it be possible to augment an existing test_progs
>> program like tools/testing/selftests/bpf/progs/test_ringbuf.c to test
>> this functionality?
How would you guarantee that LLVM generates the spill/fill, via inline asm?
> It may be possible, but from what I understood from Daniel's comment here
>
> https://lore.kernel.org/bpf/17629073-4fab-a922-ecc3-25b019960f44@iogearbox.net/
>
> the test should be a part of the verifier tests (which is reasonable
> to me since it is
> a verifier bugfix)
Yeah, the test_verifier case as you have is definitely the most straight
forward way to add coverage in this case.
next prev parent reply other threads:[~2021-01-12 15:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-12 9:15 [PATCH 2/2] selftests/bpf: add verifier test for PTR_TO_MEM spill Gilad Reti
2021-01-12 14:55 ` KP Singh
2021-01-12 15:35 ` Gilad Reti
2021-01-12 15:43 ` Daniel Borkmann [this message]
2021-01-12 16:17 ` KP Singh
2021-01-12 16:24 ` Gilad Reti
2021-01-12 16:59 ` Yonghong Song
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