lkml.org 
[lkml]   [2007]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
FromClemens Kolbitsch <>
SubjectRe: Copy large memory regions from & to userspace
DateFri, 31 Aug 2007 15:45:28 +0200
On Friday 31 August 2007 15:25:40 you wrote:
> On 8/30/07, Clemens Kolbitsch <clemens.kol@gmx.at> wrote:
> > Hi!
> > Just a short question: What is the correct method of copying large areas
> > of memory from userspace into userspace when running in kernel-mode?
>
> relayfs?

no... I'm copying user-memory to user-memory, not kernel-to-user, however
running the code in kernel-mode.

what i wanted to know is how to check the access-rights...
i didn't get any other answers, so for now i'm just using

if (access_ok(VERIFY_READ, from, PAGE_SIZE) &&
access_ok(VERIFY_WRITE, to, PAGE_SIZE))
{
memcpy(to, from, PAGE_SIZE);
}
and hope that this is the *correct* way to do it...

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-08-31 15:49    [from the cache]
©2003-2010