How to access kernel memory from user space

[Jacky Oh]

hi Gerry..


you may be interested in the following functions:

int copyin(const void *uaddr, void *kaddr, size_t len);
int copyout(const void *kaddr, void *uaddr, size_t len);
int copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done);
int bcopy(const void *src, const void *dst, len);

this functions are using for syscalls related work, among other
things..lucky!!

Jacky Ohwers

2008/12/23 Gerry Weaver <gerryw at compvia.com>

> Hello All,
>
> I am working on a driver that collects various network statistics via pfil.
> I have a simple array of structures that I use to store the statistics. I
> also have a user space process that needs to collect these statistics every
> second or so. A copy operation from kernel to user space would be too
> expensive. Is there a mechanism that would allow me to gain direct access to
> my kernel array from user space? The user process would only need read
> access. It seems like maybe this could be done with mmap, but since this is
> not a character driver, there is no device file etc.. I'm a newbie, so I
> apologize if this is something that should be obvious.
>
>
> Thanks in advance,
> Gerry
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