linux-kernel - [PATCH -tip 0/4] kprobes: Support __kprobes and NOKPROBE

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Date:   Thu, 26 Mar 2020 23:49:23 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Paul McKenney <paulmck@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH -tip 0/4] kprobes: Support __kprobes and NOKPROBE_SYMBOL in modules

Hi,

Here is a series for adding support of __kprobes attribute
and NOKPROBE_SYMBOL() macro in modules. With this series,
kprobes user can add its handlers and sub-functions to kprobe
blacklist so that other kprobes don't probe it.

Note that user should not use both __kprobes and NOKPROBE_SYMBOL()
to same function. In that case, the function will appear twice
on the blacklist, and that is a waste of memory.

Thomas, it is easy to add ".noinstr.text" support to this series.
as same as __kprobes (.kprobes.text) support in [2/4], we can
add mod->noinstr_text_start and mod->noinstr_text_size and
register it in add_module_kprobe_blacklist().


Thank you,

---

Masami Hiramatsu (4):
      kprobes: Lock kprobe_mutex while showing kprobe_blacklist
      kprobes: Support __kprobes blacklist in modules
      kprobes: Support NOKPROBE_SYMBOL() in modules
      samples/kprobes: Add __kprobes and NOKPROBE_SYMBOL() for handlers.


 include/linux/module.h              |    6 +++
 kernel/kprobes.c                    |   67 ++++++++++++++++++++++++++++++++++-
 kernel/module.c                     |    7 ++++
 samples/kprobes/kprobe_example.c    |    6 ++-
 samples/kprobes/kretprobe_example.c |    2 +
 5 files changed, 85 insertions(+), 3 deletions(-)

--
Masami Hiramatsu (Linaro) <mhiramat@...nel.org>