linux-kernel - Re: [PATCH] fbdev: potential information leak in do_fb

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Message-ID: <734ef2833e4e4e7bded92e9d964bc2415aadf3c4.camel@perches.com>
Date:   Thu, 31 Oct 2019 11:16:39 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrea Righi <andrea.righi@...onical.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Peter Rosin <peda@...ntia.se>,
        Gerd Hoffmann <kraxel@...hat.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        security@...nel.org, Kees Cook <keescook@...omium.org>,
        Julia Lawall <Julia.Lawall@...6.fr>
Subject: Re: [PATCH] fbdev: potential information leak in do_fb_ioctl()

On Wed, 2019-10-30 at 21:12 +0100, Andrea Righi wrote:
> Then memset() + memcpy() is probably the best option,
> since copying all those fields one by one looks quite ugly to me...

A memset of an automatic before a memcpy to the same
automatic is unnecessary.