Re: local DDOS? Kernel panic when accessing /proc/ioports

[Martin Loschwitz]

On Fri, Aug 05, 2005 at 03:40:26PM -0400, linux-os (Dick Johnson) wrote:
> 
> On Fri, 5 Aug 2005, Martin Loschwitz wrote:
> 
> > Hi folks,
> >
> > I just ran into the following problem: Having updated my box to 2.6.12.3,
> > I tried to start YaST2 and noticed a kernel panic (see below). Some quick
> > debugging brought the result that the kernel crashes while some user (not
> > even root ...) tries to access /proc/ioports. Is this a known problem and
> > if so, is a fix available?
> >
> > Ooops and ksymoops-output is attached.
> >
> 
> This can happen if a module is unloaded that doesn't free its
> resources! Been there, done that.
> 

"This can happen" is not an acceptable explanation, I think. Modules should
not be able to kill the kernel -- apart from that, I can trigger the bug in
the very early "ash-system" that KNOPPIX provides. At that time, the modules
listed below were the only ones loaded -- no others, and I am also sure that
until that point, no modules were unloaded.

sbp2 ohci1394 usb_storage ub ehci_hcd usbcore

-- 
  .''`.   Martin Loschwitz           Debian GNU/Linux developer
 : :'  :  madkiss@xxxxxxxxxxx        madkiss@xxxxxxxxxx
 `. `'`   http://www.madkiss.org/    people.debian.org/~madkiss/
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