The copy_from_user function copies a block of data from user space into a kernel buffer.

copy _ from_user函数将数据块从用户空间复制到内核缓冲区。

youdao

Then the data is copied by the kernel into the kernel buffer associated with the output socket.

然后由内核将数据拷贝到与输出套接字相关联的内核缓冲区。

youdao

Step two: data is copied from the kernel buffer into the user buffer, and the read system call returns.

所需的数据被从读取缓冲区拷贝到用户缓冲区，read() 调用返回。

youdao

In addition to checking daily for security updates, Mountain Lion includes app sandboxing to keep misbehaving apps from compromising your system, and kernel ASLR for improved protection against buffer overflow attacks.

ENGADGET: Apple brings Dictation to the Mac, tells Siri to stay in the car