From: Pavel Machek <pavel@suse.cz>
To: Riley Williams <rhw@memalpha.cx>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: PROBLEM: Linux updates RTC secretly when clock synchronizes
Date: Fri, 9 Nov 2001 10:32:54 +0100 [thread overview]
Message-ID: <20011109103254.B2620@atrey.karlin.mff.cuni.cz> (raw)
In-Reply-To: <20011108132639.A14160@atrey.karlin.mff.cuni.cz> <Pine.LNX.4.21.0111082252500.14996-100000@Consulate.UFP.CX>
In-Reply-To: <Pine.LNX.4.21.0111082252500.14996-100000@Consulate.UFP.CX>
Hi!
> >>>> least as KERN_DEBUG if not as KERN_NOTICE) whenever the RTC is
> >>>> written to. It's too important a subsystem to be left hidden like
> >>>> it currently is.
>
> >>> This can be as well done in userland, enforced by whoever does rtc
> >>> writes, no?
>
> >> If some idiot writes a hwclock replacement that doesn't do logging...
>
> > Then it is *his* problem. That's no excuse for putting it into kernel.
>
> So you believe viruses are a good thing to have? Sorry, I have to
> disagree with you.
> Take the position of a sysadmin who can't understand why the system
> clock on his computer keeps getting randomly changed under Linux, and
> has verified using another operating system that it isn't a hardware
> problem, then ask yourself what said sysadmin would expect from the
> kernel to help him/her track the problem down. Would said sysadmin
> prefer to be told...
>
> 1. "Look in the system log - you'll get a message every time any
> program writes to the RTC."
>
> 2. "Sorry, you'll have to go through every piece of software on
> your system and find the one that's updating the system clock
> that shouldn't be."
>
> 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()?
We are talking root only here. If sofware with uid 0 is malicious, you
have big problems.
Pavel
--
Casualities in World Trade Center: 6453 dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.
next prev parent reply other threads:[~2001-11-09 9:33 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-31 0:33 PROBLEM: Linux updates RTC secretly when clock synchronizes Ian Maclaine-cross
2001-10-31 1:05 ` Kurt Roeckx
2001-10-31 2:55 ` Ian Maclaine-cross
2001-10-31 11:52 ` Kurt Roeckx
2001-11-01 0:52 ` Riley Williams
2001-11-01 1:26 ` Kurt Roeckx
2001-11-01 13:57 ` Alex Bligh - linux-kernel
2001-11-02 9:50 ` Riley Williams
2001-11-03 11:41 ` Alex Bligh - linux-kernel
2001-11-03 18:35 ` Riley Williams
2001-11-03 19:19 ` Alex Bligh - linux-kernel
2001-11-03 21:04 ` Kurt Roeckx
2001-11-06 10:01 ` Pavel Machek
2001-11-06 9:57 ` Pavel Machek
2001-11-02 12:16 ` Pavel Machek
2001-11-05 23:08 ` Riley Williams
2001-11-06 10:17 ` Pavel Machek
2001-11-07 0:00 ` Riley Williams
2001-11-07 0:44 ` Alex Bligh - linux-kernel
2001-11-07 1:01 ` Kurt Roeckx
2001-11-07 1:15 ` Alex Bligh - linux-kernel
2001-11-07 9:24 ` Russell King
2001-11-08 12:26 ` Pavel Machek
2001-11-08 23:00 ` Riley Williams
2001-11-09 9:32 ` Pavel Machek [this message]
2001-11-09 21:11 ` Riley Williams
2001-11-09 21:30 ` Pavel Machek
2001-11-09 22:54 ` Riley Williams
2001-11-09 23:10 ` Mark Zealey
2001-11-10 20:04 ` Pavel Machek
2001-11-10 20:35 ` Riley Williams
2001-11-10 20:43 ` Pavel Machek
2001-11-10 20:49 ` Doug McNaught
2001-11-06 0:20 ` Ian Maclaine-cross
2001-11-06 10:18 ` Pavel Machek
2001-11-08 5:09 ` Ian Maclaine-cross
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