fixed a bug of proc.c, and made a small change of ucore_run #6
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在我们的工作中需要在ucore上运行一个较大的用户程序（约几十MB），但是在运行的过程中发现proc.c的proc_elf_set_permission函数中存在bug，即当用户程序所占用的pte个数大于PGSIZE时，原实现并未建立新的pte项，将导致数组越界，破坏正常数据。现已修复了这个bug。
ucore_run脚本中也存在一个bug，即在调用qemu运行ucore的时候，加入了一个不存在的硬盘镜像（yaffs），现已将这一行代码删除。
bug发现者：王纪霆，匡正非 #