linux-kernel - Re: [PATCH 0/3] add %pX specifier

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Message-ID: <CAHmME9qPguYLUk-CsKB7LEsTiP6spha-Rt7r41KG=TMdj3FnHw@mail.gmail.com>
Date:   Wed, 11 Oct 2017 22:09:20 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     "Tobin C. Harding" <me@...in.cc>
Cc:     kernel-hardening@...ts.openwall.com, kvm@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        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 <will.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>
Subject: Re: [PATCH 0/3] add %pX specifier

Hi Tobin,

On Wed, Oct 11, 2017 at 1:09 AM, Tobin C. Harding <me@...in.cc> wrote:
>
>   +        hashval = hash_three_words(
>   +                (unsigned long)ptr,
>   +                (unsigned long)ptr >> 16 >> 16,
>   +                boot_time_random_int);

This is most likely not what you want to be using. Take a look at the
siphash_* set of functions. If you're just hashing 1 64-bit pointer
with some secret, use siphash_1u64, for example. That's the right
interface for this purpose.

Regards,
Jason