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在确定PAGE_READONLY(使用虚拟保护)时,它如何会受到违反?
原标题:How can it be access violation when setting PAGE_READONLY(use VirtualprotectEx() )?
  • 时间:2011-10-31 02:56:13
  •  标签:
  • c

If I have a function foo() and I want to use VirtualProtectEx() to change the property of a variable which is in the function foo().

Like this VirtualProtectEx( GetCurrentProcess(), p, sizeof(DWORD), PAGE_READONLY, &old);

当我确定“PAGE_READONLY”并对其进行汇编时,该群人将显示接触受到侵犯的情况。

如果我确定“PAGE_READWRITE”,它将成功执行。

What s the problem?

最佳回答

您的代码问题是,p储存在 st中。 http://www.un.org/Depts/DGACM/index_chinese.htm (每个记忆页都是最小的实体,不能进一步分散。) 因此,如果你试图改变仅限<代码>p的许可,就会改变整页的许可(如果是的话)。 如果你只读一下,你就无法再执行你的方案,并导致你记忆破例。 因此,为了解决这个问题,考虑在你与时分配<条码>p。

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