From: Steven Rostedt <rostedt@goodmis.org>
To: Francis Deslauriers <francis.deslauriers@efficios.com>
Cc: mhiramat@kernel.org, peterz@infradead.org,
mathieu.desnoyers@efficios.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] kprobe: fix: Add ftrace_ops_assist_func to kprobe blacklist
Date: Fri, 14 Jul 2017 14:29:00 -0400 [thread overview]
Message-ID: <20170714142900.1c91949c@gandalf.local.home> (raw)
In-Reply-To: <1500044315-9508-3-git-send-email-francis.deslauriers@efficios.com>
On Fri, 14 Jul 2017 10:58:35 -0400
Francis Deslauriers <francis.deslauriers@efficios.com> wrote:
> This function is called when a kprobe is hit. Thus it should be
> blacklisted to prevent kprobe to be triggered by kprobes.
>
> Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
> ---
> kernel/trace/ftrace.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index b308be3..c473d9b 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -36,6 +36,7 @@
>
> #include <trace/events/sched.h>
>
> +#include <asm/kprobes.h>
> #include <asm/sections.h>
> #include <asm/setup.h>
>
> @@ -5739,6 +5740,7 @@ static void ftrace_ops_assist_func(unsigned long ip, unsigned long parent_ip,
> preempt_enable_notrace();
> trace_clear_recursion(bit);
> }
> +NOKPROBE_SYMBOL(ftrace_ops_assist_func);
Continuing from what I said in the other email, this is fixing a
symptom and not the problem. The real fix will be much more involved. I
have a good idea on how to accomplish it too.
-- Steve
>
> /**
> * ftrace_ops_get_func - get the function a trampoline should call
next prev parent reply other threads:[~2017-07-14 18:29 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-14 14:58 [PATCH 0/2] kprobe: Fix: add symbols to kprobe blacklist Francis Deslauriers
2017-07-14 14:58 ` [PATCH 1/2] kprobe: fix: Add _ASM_NOKPROBE to x86 apic interrupt macro Francis Deslauriers
2017-07-14 14:58 ` [PATCH 2/2] kprobe: fix: Add ftrace_ops_assist_func to kprobe blacklist Francis Deslauriers
2017-07-14 18:29 ` Steven Rostedt [this message]
2018-03-16 15:18 ` Francis Deslauriers
2018-03-16 15:25 ` Steven Rostedt
2018-03-16 16:28 ` Mathieu Desnoyers
2018-03-16 16:41 ` Steven Rostedt
2018-03-16 16:48 ` Steven Rostedt
2018-03-16 17:53 ` Mathieu Desnoyers
2018-03-16 19:02 ` Steven Rostedt
2018-03-17 0:13 ` Masami Hiramatsu
2018-03-17 1:22 ` Masami Hiramatsu
2018-03-17 3:01 ` Steven Rostedt
2018-03-17 7:57 ` Masami Hiramatsu
2018-07-03 22:30 ` Steven Rostedt
2018-07-11 19:34 ` Francis Deslauriers
2018-07-11 19:56 ` Steven Rostedt
2018-07-12 0:40 ` Francis Deslauriers
2018-07-12 13:59 ` Masami Hiramatsu
2018-07-12 13:46 ` Masami Hiramatsu
2018-03-17 0:08 ` Masami Hiramatsu
2018-07-12 17:54 ` [PATCH 0/2] tracing: kprobes: Prohibit probing on notrace functions Francis Deslauriers
2018-07-12 17:54 ` [PATCH 1/2] " Francis Deslauriers
2018-07-12 21:49 ` Steven Rostedt
2018-07-13 2:53 ` Masami Hiramatsu
2018-07-13 12:18 ` Steven Rostedt
2018-07-26 0:41 ` Masami Hiramatsu
2018-07-26 1:13 ` Steven Rostedt
2018-07-12 17:54 ` [PATCH 2/2] selftest/ftrace: Move kprobe selftest function to separate compile unit Francis Deslauriers
2017-07-14 18:27 ` [PATCH 0/2] kprobe: Fix: add symbols to kprobe blacklist Steven Rostedt
2017-07-16 15:59 ` Masami Hiramatsu
2017-07-16 14:37 ` Masami Hiramatsu
2017-07-16 15:46 ` Masami Hiramatsu
2017-07-17 18:46 ` Francis Deslauriers
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