Messages in this thread |  | | Date | Fri, 9 Nov 2001 22:30:53 +0100 | From | Pavel Machek <> | Subject | Re: PROBLEM: Linux updates RTC secretly when clock synchronizes |
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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/
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