Messages in this thread | | | Date | Fri, 02 Apr 2010 14:36:27 -0700 (PDT) | Subject | Re: unhelpful and somewhat scary r8169 boot message in 2.6.33.2 regarding a security fix | From | David Miller <> |
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From: Nix <nix@esperi.org.uk> Date: Fri, 02 Apr 2010 16:19:13 +0100
> So I was doing a test-boot of 2.6.33.2 to see if my hang-on-suspend > Radeon DRM regression (fdo bug 26872) was cured (it wasn't), when a > new message appeared at bootup, the second of those below: > > [ 8.766768] r8169: fastnet: link up > [ 8.791231] WARNING! Changing of MTU on this NICMay lead to frame reception errors! > > (which appeared when I set the MTU on my r8169 to 7200.) > > Not only is this message plainly misformatted :)
Formating has been fixed in the net-2.6 tree yesterday.
> but it does not explain *why* changing the MTU is suddenly so bad, > when it's worked forever before now without flaw, with no sign of > any sort of corruption. Why should we be confined to non-jumbo > frames? What are the effects if we do change MTU?
Have a look at CVE-2009-4537
It's a remotely exploitable memory corruptor and potential root hole.
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