linux-kernel - Re: [PATCH 0/5] add printk specifier %px, unique identifier

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Message-ID: <1511890919.19952.42.camel@perches.com>
Date:   Tue, 28 Nov 2017 09:41:59 -0800
From:   Joe Perches <joe@...ches.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     "Tobin C. Harding" <me@...in.cc>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Theodore Ts'o <tytso@....edu>,
        Kees Cook <keescook@...omium.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tycho Andersen <tycho@...ho.ws>,
        "Roberts, William C" <william.c.roberts@...el.com>,
        Tejun Heo <tj@...nel.org>,
        Jordan Glover <Golden_Miller83@...tonmail.ch>,
        Greg KH <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Ian Campbell <ijc@...lion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <wilal.deacon@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Chris Fries <cfries@...gle.com>,
        Dave Weinstein <olorin@...gle.com>,
        Daniel Micay <danielmicay@...il.com>,
        Djalal Harouni <tixxdz@...il.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        KVM list <kvm@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 0/5] add printk specifier %px, unique identifier

On Tue, 2017-11-28 at 09:33 -0800, Linus Torvalds wrote:
> On Mon, Nov 27, 2017 at 10:26 PM, Eric W. Biederman
> <ebiederm@...ssion.com> wrote:
> > > 
> > > Oh well, I just did /proc/<pid>/stack by making it just print 0
> > > unconditionally rather than the hex number.
> > 
> > Patch?
> 
> Oh, apparently I never pushed out yesterday.
> 
> The patch literally just affects the (useless) hex number. So:
> 
>     cat /proc/self/stack
> 
> now prints out
> 
>     [<0>] proc_pid_stack+0xaa/0x100
>     [<0>] proc_single_show+0x48/0x80
>     [<0>] seq_read+0xd2/0x410

> I considered getting rid of the whole "[<>]" thing, but that's where
> "maybe there are tools that parse this" came in.
> 
> I doubt there are any, though. If proc-ps doesn't look at this, I
> don't know what could. But the format change might as well be a
> separate thing if somebody cares deeply.

Perhaps if there are really tools that parse this
the [<leading-0-width>] should be kept the same too.

>