哪些寄存器在Linux中受到用户空间的保护? [英] Which registers are protected from user space in linux?

问题描述

我如何找出Linux内核保护了哪些寄存器，以防止用户程序集向它们写入数据?

How can I find out which registers are protected by the Linux kernel to keep user assembly from writing to them?

推荐答案

首先，请注意Linux内核本身并不真正保护寄存器.它所做的只是确保用户应用程序以3级特权(最低特权)运行.从这一点来看，是处理器对寄存器进行了强制保护.

First of all, note that the Linux kernel itself doesn't really protect registers. All it does is make sure user applications run with privilege level 3 (lowest privilege). From that point, it's the processor that enforces protection of registers.

这是只能从特权级别0(即，从内核)访问的寄存器列表:

Here is a list of registers that are only accessible from privilege level 0 (i.e., from the kernel):

• 控制寄存器(CR0-CR4)
• GDTR，LDTR和IDTR(全局/本地/中断描述符表寄存器)
• TR(任务寄存器)
• 调试寄存器(DR0-DR7)
• 所有型号专用寄存器(MSR s)

• Control registers (CR0 - CR4)
• GDTR, LDTR and IDTR (Global/Local/Interrupt Descriptor Table Register)
• TR (Task Register)
• Debug registers (DR0 - DR7)
• All Model Specific Registers (MSRs)

您应该阅读

You should read Chapter 5 of Intel's System Programming Manual for a detailed explanation on protection on the x86.

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