如何调用任何内核函数? [英] How to invoke any kernel function?

问题描述

我知道Kprobes可用于探测任何内核功能.但是，在阅读了其文档之后，我意识到它主要是一种被动实体.它只是将探针放在执行序列的中间.

I know that Kprobes can be used to probe any kernel function. But after going through its documents I realise that it is mostly a kind of passive entity. It simply puts a probe in the middle of an execution sequence.

但是，如果我想直接调用任何内核函数而不用担心执行顺序该怎么办.

But what if I want to invoke any kernel function directly without bothering about the execution sequence.

我该如何实现?

已更新:

注意:我想在我的内核模块中调用任何内核函数，而不是从任何用户空间应用程序中调用.

Note: I want to invoke any kernel function inside my kernel module and not from any user space application.

推荐答案

如果我想直接调用任何内核函数怎么办

what if I want to invoke any kernel function directly

并非所有功能都至少可以直接使用.

Not all functions can be used directly at least.

在您的情况下调用内核函数时，请考虑以下几点.

Consider the following points when calling a kernel function in your case.

只有使用 静态函数不能在该文件外部直接使用.

• kernel function from different module can be used only if it is exported using EXPORT_SYMBOL family of macros.
• static functions can't be used directly outside of that file.

示例

函数定义(i2c_smbus_read_byte_data)
http://lxr.free-electrons.com/源/驱动程序/i2c/i2c-core.c#L2689

Function definition (i2c_smbus_read_byte_data)
http://lxr.free-electrons.com/source/drivers/i2c/i2c-core.c#L2689

在这里使用
http://lxr.free-electrons.com/源/驱动程序/i2c/i2c-core.c#L350

Used here
http://lxr.free-electrons.com/source/drivers/i2c/i2c-core.c#L350

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