linux-kernel - Re: [PATCH v2 1/5] string.h: add array-wrappers for (v)memdup

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Message-ID: <CAHp75VdAXBk2GzNX+b2-t62biuOn9JHMupaVbBuVkDn5PRTg_A@mail.gmail.com>
Date:   Sun, 10 Sep 2023 10:43:42 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Philipp Stanner <pstanner@...hat.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Andy Shevchenko <andy@...nel.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Christian Brauner <brauner@...nel.org>,
        David Disseldorp <ddiss@...e.de>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Siddh Raman Pant <code@...dh.me>,
        Nick Alcock <nick.alcock@...cle.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Zack Rusin <zackr@...are.com>,
        VMware Graphics Reviewers 
        <linux-graphics-maintainer@...are.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, linux-hardening@...r.kernel.org,
        David Airlie <airlied@...hat.com>
Subject: Re: [PATCH v2 1/5] string.h: add array-wrappers for (v)memdup_user()

On Fri, Sep 8, 2023 at 11:02 PM Philipp Stanner <pstanner@...hat.com> wrote:
>
> Currently, user array duplications are sometimes done without an
> overflow check. Sometimes the checks are done manually; sometimes the
> array size is calculated with array_size() and sometimes by calculating
> n * size directly in code.
>
> Introduce wrappers for arrays for memdup_user() and vmemdup_user() to
> provide a standardized and safe way for duplicating user arrays.
>
> This is both for new code as well as replacing usage of (v)memdup_user()
> in existing code that uses, e.g., n * size to calculate array sizes.

No objections,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

-- 
With Best Regards,
Andy Shevchenko