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Subject: Re: PTRACE_{READ,WRITE}{TEXT,DATA}
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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To: Rik van Riel <riel@redhat.com>
Cc: David Miller <davem@davemloft.net>, roland@redhat.com,
       linux-kernel@vger.kernel.org
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Date: Tue, 29 Apr 2008 15:06:56 +1000
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> Strange, changing access_process_vm on Fedora 9 made gdb able to
> see video memory that the X server had mmapped.
> 
> Are you sure gdb behaves as you suggest?  
> 
> On x86 my patch seems to work as I expected...

Because /proc/<pid>/mem also uses access_process_vm(). See
fs/proc/base.c

Cheers,
Ben.