linux-kernel - Re: [GIT PATCH] UIO patches for 2.6.21

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Date:	Sun, 29 Apr 2007 17:27:49 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Greg KH <gregkh@...e.de>,
	Hans-J?rgen Koch <hjk@...utronix.de>,
	Bill Davidsen <davidsen@....com>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Benedikt Spranger <b.spranger@...utronix.de>
Subject: Re: [GIT PATCH] UIO patches for 2.6.21

> >Right, this is just a hint, that something in user space is accessing
> >the hardware directly. Not a too bad idea, but pretty much useless when
> >we add X to the picture as it will be set always :)
> 
> Index: linux-2.6.21-mm_20040728/drivers/char/mem.c
> ===================================================================
> --- linux-2.6.21-mm_20040728.orig/drivers/char/mem.c
> +++ linux-2.6.21-mm_20040728/drivers/char/mem.c
> @@ -274,6 +274,9 @@ static int mmap_mem(struct file * file, 
>  	if (!private_mapping_ok(vma))
>  		return -ENOSYS;
>  
> +	if (strcmp(current->comm, "Xorg") != 0)
> +		tainted |= TAINT_USER;
> +

The X server has many names.  Xorg isn't the name of the server here for
example (its "X"). 

Alan
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