关于PAGE_NOACCESS

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本文介绍了Windows提供的内存保护选项，包括PAGE_EXECUTE、PAGE_EXECUTE_READ、PAGE_EXECUTE_READWRITE等，详细解释了每个选项的功能及其应用场景。

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The following table lists the memory-protection options provided by Windows. You must specify one of the following values when allocating or protecting a page in memory.

Value	Meaning
PAGE_EXECUTE	Enables execute access to the committed region of pages. An attempt to read or write to the committed region results in an access violation.
PAGE_EXECUTE_READ	Enables execute and read access to the committed region of pages. An attempt to write to the committed region results in an access violation.
PAGE_EXECUTE_READWRITE	Enables execute, read, and write access to the committed region of pages.
PAGE_EXECUTE_WRITECOPY	Enables execute, read, and write access to the committed region of pages. The pages are shared read-on-write and copy-on-write.
PAGE_NOACCESS	Disables all access to the committed region of pages. An attempt to read from, write to, or execute the committed region results in an access violation exception, called a general protection (GP) fault.（memory中常看到的?形式）
PAGE_READONLY	Enables read access to the committed region of pages. An attempt to write to the committed region results in an access violation. If the system differentiates between read-only access and execute access, an attempt to execute code in the committed region results in an access violation.
PAGE_READWRITE	Enables both read and write access to the committed region of pages.
PAGE_WRITECOPY	Gives copy-on-write protection to the committed region of pages. Windows Me/98/95: This flag is not supported.