Date: Wed, 8 Nov 2017 07:58:20 +1100 From: "Tobin C. Harding" <me@...in.cc> To: David Laight <David.Laight@...LAB.COM> Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, "Jason A. Donenfeld" <Jason@...c4.com>, Theodore Ts'o <tytso@....edu>, Linus Torvalds <torvalds@...ux-foundation.org>, Kees Cook <keescook@...omium.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 <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>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, David Miller <davem@...emloft.net> Subject: Re: [PATCH v4] scripts: add leaking_addresses.pl On Tue, Nov 07, 2017 at 01:56:05PM +0000, David Laight wrote: > From: Tobin C. Harding > > Sent: 07 November 2017 10:32 > > > > Currently we are leaking addresses from the kernel to user space. This > > script is an attempt to find some of those leakages. Script parses > > `dmesg` output and /proc and /sys files for hex strings that look like > > kernel addresses. > ... > > Maybe the %p that end up in dmesg (via the kernel message buffer) should > be converted to text in a form that allows the code that reads them to > substitute alternate text for non-root users? > > Then the actual addresses will be available to root (who can probably > get most by other means) but not to the casual observer. Interesting idea. Isn't the same outcome already achieved with dmesg_restrict. I appreciate that this does beg the question 'why are we scanning dmesg then?' There has not been much discussion on dmesg_restrict. Is dmesg_restrict good enough that we needn't bother scanning it? thanks for your input, Tobin.
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