netdev - Re: [PATCH bpf-next v2 5/8] bpf: Switch BPF probe insns to bpf_probe_read

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Message-ID: <CAEf4BzYwJhAcLkOX1uc8_hypr_SoT5A7WnRx-wz8TACWrD9moA@mail.gmail.com>
Date:   Thu, 31 Oct 2019 13:08:28 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH bpf-next v2 5/8] bpf: Switch BPF probe insns to bpf_probe_read_kernel

On Wed, Oct 30, 2019 at 6:00 PM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> Commit 2a02759ef5f8 ("bpf: Add support for BTF pointers to interpreter")
> explicitly states that the pointer to BTF object is a pointer to a kernel
> object or NULL. Therefore we should also switch to using the strict kernel
> probe helper which is restricted to kernel addresses only when architectures
> have non-overlapping address spaces.
>
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> ---

Acked-by: Andrii Nakryiko <andriin@...com>

>  kernel/bpf/core.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>

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