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Date:   Wed, 24 Apr 2019 22:37:45 +0000
From:   Yonghong Song <>
To:     Matt Mullins <>, Andrew Hall <>,
        "" <>,
        "" <>,
        "" <>
CC:     "" <>,
        "Daniel Borkmann" <>,
        Martin Lau <>, Song Liu <>,
        Steven Rostedt <>,
        Ingo Molnar <>
Subject: Re: [PATCH bpf-next v4 1/5] bpf: add writable context for raw

On 4/24/19 12:07 PM, Matt Mullins wrote:
> This is an opt-in interface that allows a tracepoint to provide a safe
> buffer that can be written from a BPF_PROG_TYPE_RAW_TRACEPOINT program.
> The size of the buffer must be a compile-time constant, and is checked
> before allowing a BPF program to attach to a tracepoint that uses this
> feature.
> The pointer to this buffer will be the first argument of tracepoints
> that opt in; the pointer is valid and can be bpf_probe_read() by both
> programs that attach to such a tracepoint, but the buffer to which it
> points may only be written by the latter.
> Signed-off-by: Matt Mullins <>

Acked-by: Yonghong Song <>

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