![]() ![]() Those limitations are designed to prevent inappropriate access to information or to change behavior of the platform that could be leveraged by malicious or unauthorized users.ĭebug capabilities that could be used to expose secure assets or private user data are designed to allow use only when authenticated. Debug capabilities may be limited to platforms in certain stages of the manufacturing or development lifecycle or only during certain phases of operation (e.g., early boot). Controlling Debug Capabilitiesĭebug capabilities are designed to limit for whom or when those capabilities could be used to perform debug of a platform. The Intel® Debug Protection Technology uses access control mechanisms including authentication of the user to control access to the debug capabilities. These features are designed to enable a person to perform the necessary debug securely and without compromising or putting assets at risk of exposure to unauthorized entities. Therefore, proper protection measures must be implemented to restrict access to these debug capabilities.Ī set of features, referred to as Intel® Debug Protection Technology throughout this paper, are used to control a product’s debug capabilities to help protect secure assets residing on Intel products and private user data being processed within the silicon at run-time. Assets might be compromised due to the privileged access these debug capabilities may provide. A typical system normally contains several assets such as cryptographic keys, configuration data, intellectual property, and sensitive user data, that are stored in registers, memory blocks, fuses and/or otherwise embedded in the silicon. For example, there are debug registers that expose read-write access to internal states of a system that are not visible in a production mode. When a person (i.e., a “debugger”) places a given product in a debug mode, additional access privileges that are not available to a person in the standard operating mode (e.g., production system owned by an end user) become available. ![]() Note: the terms “product” and/or “silicon” throughout this document refer specifically to an Intel product and/or Intel silicon. Each Intel product may differ in the specific capabilities included as well as the specific protections designed for the debug capabilities. This technical paper describes the general debug capabilities within Intel's silicon as well as the means designed to protect the debug capabilities. Properly controlling these debug capabilities supports the balance of protecting assets as well as providing a critical tool to Intel, Intel's customers, and Intel's developers. Intel recognizes that debug capabilities contained within the hardware can be an attack surface used by adversaries to gain access to secure assets and private user data. The term “debug” spans a wide variety of use models from internal hardware debug through debug of performance issues of software running on the silicon. Intel is not unique in this regard other silicon engineering companies include these or similar types of capabilities in order to bring products to market. Unlike software debug features which can be excluded in production software, the nature of silicon development precludes hardware features from being removed in the final production silicon. As a result, Intel silicon contains several different technology capabilities used to debug its silicon. Subsequent requests will also be bypassed.Debug is a critical capability of any system in order to get the system from manufacturing to production to deployment. BYPASS occurs when a pattern was explicitly configured NOT to use cache.In correct configuration, subsequent requests will be served from cache based on caching duration other parameters. ![]() MISS occurs when a pattern is configured to cache but at the time of request was not cached.# security for bypass so localhost can empty cache Proxy_cache_path /var/lib/nginx/cache levels=1:2 inactive=400d keys_zone=staticfilecache:180m max_size=700m Īdd_header Cache-BYPASS-Reason $skip_reason How do I debug why these MISSes are happening? How do I find out if the miss was due to eviction, expiration, some rogue header etc? Does Nginx provide commands for this? And this is for pages I intentionally ran a cache warmer an hour ago. I track HIT and MISS via add_header X-Cache-Status $upstream_cache_status ĭespite these settings I am seeing a lot of MISSes. Proxy cache valid is set to proxy_cache_valid 200 120d My proxy cache path is set to a very high size proxy_cache_path /var/lib/nginx/cache levels=1:2 keys_zone=staticfilecache:180m max_size=700m ![]()
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