linux-kernel - Re: [PATCH -tip v2 4/7] kprobes: Replace %p with other pointer types

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Date:   Fri, 27 Apr 2018 11:39:51 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Ananth N Mavinakayanahalli <ananth@...ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jon Medhurst <tixy@...aro.org>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        "Tobin C . Harding" <me@...in.cc>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        akpm@...ux-foundation.org, acme@...nel.org,
        brueckner@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        stable@...r.kernel.org
Subject: Re: [PATCH -tip v2 4/7] kprobes: Replace %p with other pointer
 types

On Thu, 26 Apr 2018 21:13:51 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Thu, 26 Apr 2018 17:10:03 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > Replace %p with appropriate pointer types (or just remove it)
> >  - Use %pS if possible
> >  - Use %px only for the function right before BUG().
> >  - Remove unneeded error message.
> 
> I'm not sure "right before BUG()" is legitimate for using %px. Why not
> still use %pS?

Since BUG() will dump all registers and stacks which includes
raw address information and reboot the system (means reset the
kaslr base offset), I thought it may not add additional damage.

Anyway, for this patch we can use %pS. For the next [5/7] patch,
I'm not sure %pS is good for dumping a stack address...

Thank you,

> 
> -- Steve
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>