linux-kernel - Re: [RFC][PATCH] procfs: Add /proc/<pid>/mapped

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Date:	Thu, 15 Jan 2015 17:15:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:	Calvin Owens <calvinowens@...com>,
	Siddhesh Poyarekar <siddhesh.poyarekar@...il.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Peter Feiner <pfeiner@...gle.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel <linux-kernel@...r.kernel.org>, <kernel-team@...com>
Subject: Re: [RFC][PATCH] procfs: Add /proc/<pid>/mapped_files

On Thu, 15 Jan 2015 00:51:50 +0100 Rasmus Villemoes <linux@...musvillemoes.dk> wrote:

> > There are still several flags unused in vma.vm_flags btw.
> >
> > I'm not sure that we can repurpose vm_pgoff (or vm_private_data) for
> > this: a badly behaved thread could make its sp point at a random vma
> > then trick the kernel into scribbling on that vma's vm_proff?
> 
> Well, we could still check vm_file for being NULL before writing to
> vm_pgoff/vm_stack_tid. 

Yes, I guess that would work.  We'd need to check that nobody else
is already playing similar games with vm_pgoff.
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