From: Arjan van de Ven <arjan@infradead.org>
To: yogeshwar sonawane <yogyas@gmail.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: referring a user address from ioctl entry point
Date: Tue, 21 Mar 2006 15:47:08 +0100 [thread overview]
Message-ID: <1142952429.3077.87.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <b681c62b0603210644p41711a16ydda5b18bfb531641@mail.gmail.com>
On Tue, 2006-03-21 at 20:14 +0530, yogeshwar sonawane wrote:
> Hi all,
>
> can we write directly to user virtual address from kernel space?
> i.e. dereferencing a user address from driver entry point?
>
No this is not allowed and a big security hole at minimum.
You HAVE to use copy_from_user / copy_to_user and similar API to do
this. Be glad the FC3 kernel doesn't allow this at all ;)
prev parent reply other threads:[~2006-03-21 14:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-21 14:44 yogeshwar sonawane
2006-03-21 14:47 ` Arjan van de Ven [this message]
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