linux-kernel - Re: [PATCH 4/4] arm64: implement KPROBES_ON

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Message-ID: <20190820100522.55bc3f42@xhacker.debian>
Date:   Tue, 20 Aug 2019 02:16:28 +0000
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>
CC:     Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        "David S. Miller" <davem@...emloft.net>,
        "H. Peter Anvin" <hpa@...or.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 4/4] arm64: implement KPROBES_ON_FTRACE

On Mon, 19 Aug 2019 22:22:12 +0530 "Naveen N. Rao" wrote:


> 
> 
> Jisheng Zhang wrote:
> > This patch implements KPROBES_ON_FTRACE for arm64.
> >
> > ~ # mount -t debugfs debugfs /sys/kernel/debug/
> > ~ # cd /sys/kernel/debug/
> > /sys/kernel/debug # echo 'p _do_fork' > tracing/kprobe_events
> >
> > before the patch:
> >
> > /sys/kernel/debug # cat kprobes/list
> > ffffff801009ff7c  k  _do_fork+0x4    [DISABLED]  
> 
> This looks wrong -- we should not be allowing kprobe to be registered on

Yes. I made a mistake when dumping this log. The kernel isn't as clean
as "before the patch".


> ftrace address without KPROBES_ON_FTRACE. Is _do_fork+0x4 the location
> of ftrace entry on arm64?

Indeed, w/o KPROBES_ON_FTRACE, it should be _do_fork+0x0

Thanks