lkml.org 
[lkml]   [2001]   [Nov]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: PROBLEM: Linux updates RTC secretly when clock synchronizes
Hi!

> >> According to your comments, you prefer (2).
> >>
> >> I most definitely prefer (1).
>
> > Hmm, and if some malicious software insmods kernel module to work
> > around your printk()?
>
> ...it gets "Port busy" when it tries to access the RTC ports that the
> RTC driver built into the kernel already has opened exclusively. At
> least, that's my understanding of the situation at present.

It does not work that way. Userland does iopl(0), and then it just
bangs any port it wants to.

> > We are talking root only here.
>
> Are we?
>
> Unless I've misunderstood the arguments so far, the aim is to take the
> RTC driver out of the kernel altogether and replace it with a usermode
> driver to do the same thing. As I see it, that opens up far too many

No. Aim is to leave /dev/rtc in kernel, but make kernel never write to
RTC at its own will.
Pavel
--
Casualities in World Trade Center: 6453 dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.
-
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: 2005-03-22 13:13    [W:0.074 / U:1.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site