linux-kernel - Re: [PATCH] kprobes: Allow kprobes coexist with livepatch

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Message-ID: <20190725093353.6e4d561f@gandalf.local.home>
Date:   Thu, 25 Jul 2019 09:33:53 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH] kprobes: Allow kprobes coexist with livepatch

On Thu, 25 Jul 2019 15:24:37 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Allow kprobes which do not modify regs->ip, coexist with livepatch
> by dropping FTRACE_OPS_FL_IPMODIFY from ftrace_ops.
> 
> User who wants to modify regs->ip (e.g. function fault injection)
> must set a dummy post_handler to its kprobes when registering.
> However, if such regs->ip modifying kprobes is set on a function,
> that function can not be livepatched.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>


Looks good! I applied it.

Thanks Masami!

-- Steve