[RFC] fs, proc: Introduce the /proc/<pid>/map_files/ directory v2

Pavel Emelyanov xemul at parallels.com
Thu Aug 25 07:47:47 PDT 2011

On 08/25/2011 06:04 PM, Andi Kleen wrote:
> On Thu, Aug 25, 2011 at 10:42:44AM +0400, Pavel Emelyanov wrote:
>> On 08/24/2011 09:36 PM, Andi Kleen wrote:
>>> Pavel Emelyanov <xemul at parallels.com> writes:
>>>> No and this is the trick - when you readlink it - it give you trash, but
>>>> when you open one - you get exactly the same file as the map points to.
>>> Isn't that a minor security hole?
>>> For example if I pass a file descriptor into a chroot process for
>>> reading, and with this interface you can open it for writing too.
>>> I could see this causing problems.
>> How does it differ from the /proc/pid/fd links?
> Those cannot be opened I thought.

Neither can be these links then - I use the same access checks in my code.

> -Andi

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