kernel-hardening - Re: [PATCH V11 4/5] vsprintf: add printk specifier %px

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Message-ID: <CA+55aFxgGb13hqoNQ8bzFn4ENZM25PBSdi5pkFUBa5Hk+j-s3Q@mail.gmail.com>
Date: Tue, 28 Nov 2017 18:29:02 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: "Tobin C. Harding" <me@...in.cc>
Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, 
	"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>, Joe Perches <joe@...ches.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>, Network Development <netdev@...r.kernel.org>, 
	David Miller <davem@...emloft.net>, Stephen Rothwell <sfr@...b.auug.org.au>, 
	Andrey Ryabinin <aryabinin@...tuozzo.com>, Alexander Potapenko <glider@...gle.com>, 
	Dmitry Vyukov <dvyukov@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH V11 4/5] vsprintf: add printk specifier %px

On Tue, Nov 28, 2017 at 6:05 PM, Tobin C. Harding <me@...in.cc> wrote:
>
>    Let's add specifier %px as a
> clear, opt-in, way to print a pointer and maintain some level of
> isolation from all the other hex integer output within the Kernel.

Yes, I like this model. It's easy and it's obvious ("'x' for hex"),
and it gives people a good way to say "yes, I really want the actual
address as hex" for if/when the hashed pointer doesn't work for some
reason.

So me likey.

And as with the address leaking script, I'd like it even more if you
made it a git tree and I'll pull it.

Thanks,

                      Linus

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