linux-kernel - Re: [PATCH] tracing/user_events: Add eBPF interface for user

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAADnVQ+XpoCjL-rSz2hj05L21s8NtMJuWYC14b9Mvk7XE5KT_g@mail.gmail.com>
Date:   Tue, 29 Mar 2022 12:50:40 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Beau Belgrave <beaub@...ux.microsoft.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-trace-devel <linux-trace-devel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH] tracing/user_events: Add eBPF interface for user_event
 created events

On Tue, Mar 29, 2022 at 11:19 AM Beau Belgrave
<beaub@...ux.microsoft.com> wrote:
>
> Send user_event data to attached eBPF programs for user_event based perf
> events.
>
> Add BPF_ITER flag to allow user_event data to have a zero copy path into
> eBPF programs if required.
>
> Update documentation to describe new flags and structures for eBPF
> integration.
>
> Signed-off-by: Beau Belgrave <beaub@...ux.microsoft.com>

The commit describes _what_ it does, but says nothing about _why_.
At present I see no use out of bpf and user_events connection.
The whole user_events feature looks redundant to me.
We have uprobes and usdt. It doesn't look to me that
user_events provide anything new that wasn't available earlier.