• Matt Mullins's avatar
    bpf: add writable context for raw tracepoints · 9df1c28b
    Matt Mullins authored
    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: default avatarMatt Mullins <mmullins@fb.com>
    Acked-by: default avatarYonghong Song <yhs@fb.com>
    Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
    9df1c28b
tracepoint-defs.h 1.03 KB