connect_db(config.db_url)?;
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，详情可参考新收录的资料
Water and dust resistance rating
The following sections go into more detail about each of these algorithms.
The second setting is Supervisor Mode Access Prevention (SMAP) (CR4.SMAP). Its full description in Volume 3, Section 4.6 is verbose, but the executive summary is that SMAP disables the kernel’s ability to read or write userspace memory entirely. This hinders security exploits which populate userspace with malicious data to be read by the kernel during exploitation.