linux-kernel - Re: [PATCH] add param that allows bootline control of hardened usercopy

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Message-ID: <CAGXu5jL=aEXHKr5ouVdSKwG-y7xSQFLi=x1nwSjFspYiyKL1Pw@mail.gmail.com>
Date:   Mon, 25 Jun 2018 11:21:38 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Chris von Recklinghausen <crecklin@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm@...r.kernel.org
Subject: Re: [PATCH] add param that allows bootline control of hardened usercopy

On Mon, Jun 25, 2018 at 8:08 AM, Chris von Recklinghausen
<crecklin@...hat.com> wrote:
> Enabling HARDENED_USER_COPY causes measurable regressions in the
> networking performances, up to 8% under UDP flood.

Which function is "hot"? i.e. which copy*user() is taking up the time?
Do you have a workload that at can be used to reproduce the problem?

-Kees

-- 
Kees Cook
Pixel Security