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

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Date:   Sat, 27 Oct 2018 10:58:08 -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>,
        Linus Torvalds <torvalds@...ux-foundation.org>
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.
>

A patch to protect regs_within_kernel_stack() with
probe_kernel_read() has already been accepted. Can someone give an
Acked-by on this patch? As it does touch x86.

Thanks!

-- Steve