Re: Accessing user-land memory without safe functions

Jonathan Corbet
2015-12-04T00:12:40Z

On Thu, 3 Dec 2015 13:54:30 -0700
Scotty Bauer <sbauer@eng.utah.edu> wrote:

> Since I've seen this a couple times now I'm wondering if my
> understanding of touching user-land memory is flawed.
>
> For the above example Ioctl, the proper way to get access to those fields
> through the safe copy_from_user or get_user() functions, correct?
>
> I'm wondering if I should submit patches to fix the issues I've found,
> but now I'm doubting whether they're really issues at all.

They sound like bugs to me, though it would be easier to say for sure with
a pointer to a specific function in the kernel source. Please point
something out, or, perhaps better, send a patch fixing one of them.

Thanks,

jon