netdev - Re: [PATCH v4 bpf-next 2/2] selftests/bpf: add tests for bpf_find

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Message-ID: <da07689d-d7be-5c41-fcc2-f4f14e0f97be@fb.com>
Date:   Thu, 4 Nov 2021 16:34:28 -0700
From:   Yonghong Song <yhs@...com>
To:     Song Liu <songliubraving@...com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <kernel-team@...com>, <kpsingh@...nel.org>
Subject: Re: [PATCH v4 bpf-next 2/2] selftests/bpf: add tests for bpf_find_vma



On 11/4/21 2:31 PM, Song Liu wrote:
> Add tests for bpf_find_vma in perf_event program and kprobe program. The
> perf_event program is triggered from NMI context, so the second call of
> bpf_find_vma() will return -EBUSY (irq_work busy). The kprobe program,
> on the other hand, does not have this constraint.
> 
> Also add tests for illegal writes to task or vma from the callback
> function. The verifier should reject both cases.
> 
> Signed-off-by: Song Liu <songliubraving@...com>

Acked-by: Yonghong Song <yhs@...com>