Re: access_ok inside kernelspace

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 19 Oct 1999 12:36:50 +0100 (BST)


> calling sys_function() functions directly doesn't look right:
>
> 1. what if one was to do some accounting of the system calls. Not going
> through the int 0x80 would break this.

If you are accounting system calls then you don't wish to account internal
use of functions by the kernel. The app made _one_ syscall. You count it
once.

> 2. what if one were to temporarily redirect some system calls to another
> handler (like timetravel.o module does).

The internal calls are not syscalls. It makes total sense for the kernel to
use its own functions to implement things cleanly. Are you redirecting a
syscall or a function. The former you change the syscall table, the latter
you tweak the kernel to use a function pointer

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