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The maximum size of a message is part of the protocol spec in xen/include/public/io/xs_wire.h Before this patch a client which sends an overly large message can cause a buffer read overrun. Note if a badly-behaved client sends a very large message then it will be difficult for them to make their connection work again-- they will probably need to reboot. Signed-off-by: David Scott <dave.scott@eu.citrix.com> Acked-by: Ian Campbell <Ian.Campbell@citrix.com> Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>