Re: [PATCH bpf-next v4 1/5] bpf: add writable context for raw tracepoints

[Yonghong Song]

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
> BPF_PROG_TYPE_RAW_TRACEPOINT and BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE
> 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 <mmullins@xxxxxx>

Acked-by: Yonghong Song <yhs@xxxxxx>