linux-kernel - Re: [PATCH bpf v2 2/2] selftests/bpf: add verifier test for PTR_TO

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Message-ID: <CACYkzJ5_6Tux12V5hSigmLRYLg8qzM_kbOypeYx3rXPad3ZMiw@mail.gmail.com>
Date:   Wed, 13 Jan 2021 23:28:53 +0100
From:   KP Singh <kpsingh@...nel.org>
To:     Yonghong Song <yhs@...com>
Cc:     Gilad Reti <gilad.reti@...il.com>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Networking <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf v2 2/2] selftests/bpf: add verifier test for
 PTR_TO_MEM spill

On Wed, Jan 13, 2021 at 5:05 PM Yonghong Song <yhs@...com> wrote:
>
>
>
> On 1/12/21 9:38 PM, Gilad Reti wrote:
> > Add a test to check that the verifier is able to recognize spilling of
> > PTR_TO_MEM registers, by reserving a ringbuf buffer, forcing the spill
> > of a pointer holding the buffer address to the stack, filling it back
> > in from the stack and writing to the memory area pointed by it.
> >
> > The patch was partially contributed by CyberArk Software, Inc.
> >
> > Signed-off-by: Gilad Reti <gilad.reti@...il.com>
>
> I didn't verify result_unpriv = ACCEPT part. I think it is correct
> by checking code.
>
> Acked-by: Yonghong Song <yhs@...com>

Thanks for the description!

Acked-by: KP Singh <kpsingh@...nel.org>