Add checks that structure end is inside memory area [mem, mem + size]
before dereferencing structures.
Otherwise, for example, vdso_fill_symtable will try to dereference
ehdr members even with vma size 0.
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>