Messages in this thread | | | Date | Sat, 17 Mar 2018 09:13:34 +0900 | From | Masami Hiramatsu <> | Subject | Re: [PATCH 2/2] kprobe: fix: Add ftrace_ops_assist_func to kprobe blacklist |
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On Fri, 16 Mar 2018 13:53:01 -0400 (EDT) Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote:
> ----- On Mar 16, 2018, at 12:48 PM, rostedt rostedt@goodmis.org wrote: > > > On Fri, 16 Mar 2018 12:41:34 -0400 > > Steven Rostedt <rostedt@goodmis.org> wrote: > > > >> Yes, kprobes are dangerous. I'm not saying it shouldn't be fixed, I'm > >> saying that I don't have time to fix it now, but would be happy to > >> accept patches if someone else does so. > > > > And looking at what I replied before for the original patch. It would > > probably be a good idea to blacklist directories. Like we do with > > function tracing. We probably should black list both kernel/tracing and > > kernel/events from being probed. > > > > Did this come up at plumbers? You were there too, I don't remember > > discussing it there. > > I don't remember this coming up last Plumbers nor KS neither, given > that we were focused on other topics. > > Would the general approach you envision be based on emitting all code > generated by compilation of all objects under kernel/tracing and > kernel/events into a specific "nokprobes" text section of the kernel ? > Perhaps we could create a specific linker scripts for those directories, > or do you have in mind a neater way to do this ?
.kprobes.text section still exists. As I pointed in previous mail, I don't think we have to put all those code into that section. But if you want, it is acceptable to have a kconfig which push most of those ftrace related code into .kprobes.text section.
Thank,
> > Thanks, > > Mathieu > > > > > -- Steve > > -- > Mathieu Desnoyers > EfficiOS Inc. > http://www.efficios.com
-- Masami Hiramatsu <mhiramat@kernel.org>
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