[2.5.47]Add exported valid_kernel_address()

For modular lkcd I guess. Make a lot of sense to do it modular.

-Andi

I had a need for it in a sample kprobes driver where I wanted to verify that some address
was a valid kernel space address before I handed a probe to kprobes.

So I would do something like:

if (!valid_kernel_address(probe->addr)) {
    ret = -EINVAL;
    goto out;
}

register_kprobe(probe);

and then kpboes will go and attempt to set *(probe->addr) = BREAK_POINT;

-rustyl
----- Original Message -----
From: "Andi Kleen" <[email protected]>
To: "Arjan van de Ven" <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Wednesday, November 13, 2002 1:14 PM
Subject: Re: [PATCH][2.5.47]Add exported valid_kernel_address()

To clarify further, I am talking about the sample driver I submitted earlier at
http://marc.theaimsgroup.com/?l=linux-kernel&m=103721364225087&w=2

The patch implements a char device that enables arbitrary printk's to be inserted at in arbitrary kernel addresses. It is used by writing strings of the
form "0xADDRESS MESSAGE" to the device.

I was looking for a way to verify the address passed in was valid before creating and inserting a new probe.

Maybe there is a better way to verify a kernel address is valid before messing
with it?

-rusty
----- Original Message -----
From: "Rusty Lynch" <[email protected]>
To: "Arjan van de Ven" <[email protected]>; "Andi Kleen" <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Wednesday, November 13, 2002 1:24 PM
Subject: Re: [PATCH][2.5.47]Add exported valid_kernel_address()

that

need