linux-kernel - Re: BUG: bad usercopy in memdup

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Message-ID: <CAGXu5jLZGW8sodoNw6h+BWxnAGjpW0HTMEjx=Ee9AZ6PgVwX4A@mail.gmail.com>
Date:   Tue, 19 Dec 2017 13:54:56 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        "Tobin C. Harding" <me@...in.cc>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Linux-MM <linux-mm@...ck.org>,
        syzbot 
        <bot+719398b443fd30155f92f2a888e749026c62b427@...kaller.appspotmail.com>,
        David Windsor <dave@...lcore.net>, keun-o.park@...kmatter.ae,
        Laura Abbott <labbott@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ingo Molnar <mingo@...nel.org>,
        syzkaller-bugs@...glegroups.com, Will Deacon <will.deacon@....com>
Subject: Re: BUG: bad usercopy in memdup_user

On Tue, Dec 19, 2017 at 1:36 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> In this case, there's obviously no permission issue: it's an error
> report. So it's either "remove it, or switch to %px".

Yup, my intention was to kill this %p and enhance the report to
actually include the useful information like, "what is the offset from
the start of the object", etc. That's what really matters.

-Kees

-- 
Kees Cook
Pixel Security