linux-kernel - Re: [patch 03/11] GRU Driver - driver internal header files

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Date:	Tue, 10 Jun 2008 09:57:11 -0500
From:	Jack Steiner <steiner@....com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de, holt@....com, andrea@...ranet.com
Subject: Re: [patch 03/11] GRU Driver - driver internal header files

On Mon, Jun 09, 2008 at 02:38:18PM -0700, Roland Dreier wrote:
>  > +/*
>  > + * Structure used to pass TLB flush parameters to the driver
>  > + */
>  > +struct gru_flush_tlb_req {
>  > +	unsigned long	gseg;
>  > +	unsigned long	vaddr;
>  > +	size_t		len;
>  > +};
> 
> This and other data structures you pass into the kernel via ioctl() are
> not 32/64 clean.  So a 32-bit process (which can easily run on a 64-bit
> x86-64 kernel) will end up sending garbage to the kernel.

Good point in general but I don't this this will be an issue for us.
The data structures are used only in libgru.so - a library used to
externalize the GRU to user applications.  We will provide only -64
bit versions of this library.

If an abusive -32 bit application _tried_ to issue the system calls, the
parameters should fail the validity checking in the driver.


--- jack
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