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Message-ID: <20171018152858.fe6svcxycvzzadpy@thunk.org>
Date: Wed, 18 Oct 2017 11:28:58 -0400
From: Theodore Ts'o <tytso@....edu>
To: "Tobin C. Harding" <me@...in.cc>
Cc: Kees Cook <keescook@...omium.org>, Steven Rostedt <rostedt@...dmis.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Tycho Andersen <tycho@...ker.com>,
"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 <will.deacon@....com>, Chris Fries <cfries@...gle.com>,
Dave Weinstein <olorin@...gle.com>,
Daniel Micay <danielmicay@...il.com>,
Djalal Harouni <tixxdz@...il.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH v2] printk: hash addresses printed
with %p
On Wed, Oct 18, 2017 at 01:28:05PM +1100, Tobin C. Harding wrote:
> > >> Does %p[FfSs] leak addresses? Well, I guess it does if they are not
> > >> found in kallsyms, but otherwise you have:
> > >>
> > >> function+0x<offset>
> > >
> >
> > They haven't traditionally been a big deal. If they turn out to be
> > problematic, we can deal with it then, IMO.
If it's not in kallsyms, the raw address is probably not going to be
terribly useful --- so even if it's not traditionally been a big deal,
why not just hash them if it's not going to be printed as "function+0x<offset>"?
If nothing else, it will help correlate the random address with other
places where it was printed via %p.
- Ted
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