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为什么只有一半的堆栈金丝雀被清除？

我拆解了一个简单的C程序 (由gcc编译)，负责放置堆栈金丝雀的指令如下:
Mov % fs:0x28，% rax
Mov % rax，-0x8(% rbp)
Xor % eax，% eax
N.

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