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From: Kees Cook <keescook@chromium.org>
Date: Tue, 19 Dec 2017 13:54:56 -0800
Message-ID: <CAGXu5jLZGW8sodoNw6h+BWxnAGjpW0HTMEjx=Ee9AZ6PgVwX4A@mail.gmail.com>
Subject: Re: BUG: bad usercopy in memdup_user
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>, "Tobin C. Harding" <me@tobin.cc>,
        Dmitry Vyukov <dvyukov@google.com>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Linux-MM <linux-mm@kvack.org>,
        syzbot 
        <bot+719398b443fd30155f92f2a888e749026c62b427@syzkaller.appspotmail.com>,
        David Windsor <dave@nullcore.net>, keun-o.park@darkmatter.ae,
        Laura Abbott <labbott@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
        Mark Rutland <mark.rutland@arm.com>, Ingo Molnar <mingo@kernel.org>,
        syzkaller-bugs@googlegroups.com, Will Deacon <will.deacon@arm.com>
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On Tue, Dec 19, 2017 at 1:36 PM, Linus Torvalds
<torvalds@linux-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