linux-kernel - Re: [RFC][PATCH] x86: ptrace: Add function argument access API

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Message-ID: <20181012142243.7723ea7d@gandalf.local.home>
Date:   Fri, 12 Oct 2018 14:22:43 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [RFC][PATCH] x86: ptrace: Add function argument access API

On Fri, 12 Oct 2018 11:21:28 -0700
Andy Lutomirski <luto@...capital.net> wrote:

> On Fri, Oct 12, 2018 at 9:26 AM Steven Rostedt <rostedt@...dmis.org> wrote:
> >
> >
> > Anyone have any issues with this patch?
> >  
> 
> I'm conceptually okay with it.  That being said,
> regs_within_kernel_stack(), which you're indirectly using, is
> off-by-a-few.  And updating it to use probe_kernel_read() might be
> nice for robustness.
> 

100% agree. I'll add a patch on top of it to make the changes, and keep
what Masami had originally for full history.

Thanks for taking the time to take a look at it.

-- Steve