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    SubjectRe: unhelpful and somewhat scary r8169 boot message in 2.6.33.2 regarding a security fix
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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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