ipc: Don't access data out of allocated slab
ipc: Don't access data out of allocated slab

We should zeroify all data actually for security
reason but this aspect will be addressed in further
patches.

Meanwhile at least allocate enought space so pb_write
won't access data which is not allocated for us.

Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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