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From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 1/4] kprobes: adjust kprobe addr for KPROBES_ON_FTRACE
Date: Tue, 20 Aug 2019 01:51:52 +0000	[thread overview]
Message-ID: <20190820094041.7072d90b@xhacker.debian> (raw)
In-Reply-To: <1566232801.derqq08wxh.naveen@linux.ibm.com>

On Mon, 19 Aug 2019 22:13:02 +0530 "Naveen N. Rao"  wrote:

> CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> 
> Jisheng Zhang wrote:
> > For KPROBES_ON_FTRACE case, we need to adjust the kprobe's addr
> > correspondingly.
> >
> > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> > ---
> >  kernel/kprobes.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> > index 9873fc627d61..f8400753a8a9 100644
> > --- a/kernel/kprobes.c
> > +++ b/kernel/kprobes.c
> > @@ -1560,6 +1560,9 @@ int register_kprobe(struct kprobe *p)
> >       addr = kprobe_addr(p);
> >       if (IS_ERR(addr))
> >               return PTR_ERR(addr);
> > +#ifdef CONFIG_KPROBES_ON_FTRACE
> > +     addr = (kprobe_opcode_t *)ftrace_call_adjust((unsigned long)addr);
> > +#endif
> >       p->addr = addr;  
> 
> I'm not sure what this is achieving, but looks wrong to me.

Indeed, I didn't take care of non-ftrace addr when KPROBES_ON_FTRACE, will
update in next version.

thanks

> 
> If you intend to have kprobes default to using ftrace entry for probing
> functions, consider over-riding kprobe_lookup_name() -- see powerpc
> variant for example.
> 
> 
> - Naveen
> 


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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
	Borislav Petkov <bp@alien8.de>,
	Catalin Marinas <catalin.marinas@arm.com>,
	"David S. Miller" <davem@davemloft.net>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Ingo Molnar <mingo@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH 1/4] kprobes: adjust kprobe addr for KPROBES_ON_FTRACE
Date: Tue, 20 Aug 2019 01:51:52 +0000	[thread overview]
Message-ID: <20190820094041.7072d90b@xhacker.debian> (raw)
In-Reply-To: <1566232801.derqq08wxh.naveen@linux.ibm.com>

On Mon, 19 Aug 2019 22:13:02 +0530 "Naveen N. Rao"  wrote:

> CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> 
> Jisheng Zhang wrote:
> > For KPROBES_ON_FTRACE case, we need to adjust the kprobe's addr
> > correspondingly.
> >
> > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> > ---
> >  kernel/kprobes.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> > index 9873fc627d61..f8400753a8a9 100644
> > --- a/kernel/kprobes.c
> > +++ b/kernel/kprobes.c
> > @@ -1560,6 +1560,9 @@ int register_kprobe(struct kprobe *p)
> >       addr = kprobe_addr(p);
> >       if (IS_ERR(addr))
> >               return PTR_ERR(addr);
> > +#ifdef CONFIG_KPROBES_ON_FTRACE
> > +     addr = (kprobe_opcode_t *)ftrace_call_adjust((unsigned long)addr);
> > +#endif
> >       p->addr = addr;  
> 
> I'm not sure what this is achieving, but looks wrong to me.

Indeed, I didn't take care of non-ftrace addr when KPROBES_ON_FTRACE, will
update in next version.

thanks

> 
> If you intend to have kprobes default to using ftrace entry for probing
> functions, consider over-riding kprobe_lookup_name() -- see powerpc
> variant for example.
> 
> 
> - Naveen
> 


  reply	other threads:[~2019-08-20  1:52 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-19 11:35 [PATCH 0/4] arm64: KPROBES_ON_FTRACE Jisheng Zhang
2019-08-19 11:35 ` Jisheng Zhang
2019-08-19 11:36 ` [PATCH 1/4] kprobes: adjust kprobe addr for KPROBES_ON_FTRACE Jisheng Zhang
2019-08-19 11:36   ` Jisheng Zhang
2019-08-19 16:43   ` Naveen N. Rao
2019-08-19 16:43     ` Naveen N. Rao
2019-08-20  1:51     ` Jisheng Zhang [this message]
2019-08-20  1:51       ` Jisheng Zhang
2019-08-20  0:01   ` Masami Hiramatsu
2019-08-20  0:01     ` Masami Hiramatsu
2019-08-20  2:05     ` Jisheng Zhang
2019-08-20  2:05       ` Jisheng Zhang
2019-08-19 11:36 ` [PATCH 2/4] kprobes/x86: use instruction_pointer and instruction_pointer_set Jisheng Zhang
2019-08-19 11:36   ` Jisheng Zhang
2019-08-20  0:09   ` Masami Hiramatsu
2019-08-20  0:09     ` Masami Hiramatsu
2019-08-19 11:37 ` [PATCH 3/4] kprobes: move kprobe_ftrace_handler() from x86 and make it weak Jisheng Zhang
2019-08-19 11:37   ` Jisheng Zhang
2019-08-20  0:07   ` Masami Hiramatsu
2019-08-20  0:07     ` Masami Hiramatsu
2019-08-20  1:56     ` Jisheng Zhang
2019-08-20  1:56       ` Jisheng Zhang
2019-08-19 11:38 ` [PATCH 4/4] arm64: implement KPROBES_ON_FTRACE Jisheng Zhang
2019-08-19 11:38   ` Jisheng Zhang
2019-08-19 16:52   ` Naveen N. Rao
2019-08-19 16:52     ` Naveen N. Rao
2019-08-20  2:16     ` Jisheng Zhang
2019-08-20  2:16       ` Jisheng Zhang
2019-08-19 12:53 ` [PATCH 0/4] arm64: KPROBES_ON_FTRACE Mark Rutland
2019-08-19 12:53   ` Mark Rutland
2019-08-19 13:10 ` Masami Hiramatsu
2019-08-19 13:10   ` Masami Hiramatsu

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