linux-kernel - RE: [PATCH v2 2/5] uaccess-buffer: add core code

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Message-ID: <1dab2edad29b482e8b7965a373ed0dea@AcuMS.aculab.com>
Date:   Tue, 23 Nov 2021 14:53:53 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Alexander Potapenko' <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
CC:     Peter Collingbourne <pcc@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Masahiro Yamada" <masahiroy@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        "YiFei Zhu" <yifeifz2@...inois.edu>,
        Colin Ian King <colin.king@...onical.com>,
        "Mark Rutland" <mark.rutland@....com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        Chris Hyser <chris.hyser@...cle.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Christian Brauner <christian.brauner@...ntu.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Alexey Gladkov <legion@...nel.org>,
        Ran Xiaokai <ran.xiaokai@....com.cn>,
        David Hildenbrand <david@...hat.com>,
        Xiaofeng Cao <caoxiaofeng@...ong.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Thomas Cedeno <thomascedeno@...gle.com>,
        Marco Elver <elver@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Evgenii Stepanov <eugenis@...gle.com>
Subject: RE: [PATCH v2 2/5] uaccess-buffer: add core code

From: Alexander Potapenko
> Sent: 23 November 2021 10:20
...
> So if uaccess logging is meant for production use, it should be
> possible to lock the feature down from unwanted users.

Isn't the conditional for logging every get_user() and put_user()
going to completely kill performance?

I'm not sure I'd want this code compiled into any kernel I use.

	David

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