Messages in this thread | | | Date | Tue, 07 Aug 2012 15:31:21 -0700 | From | John Stultz <> | Subject | Re: NULL pointer dereference in selinux_ip_postroute_compat |
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On 08/07/2012 03:26 PM, John Stultz wrote: > On 08/07/2012 03:01 PM, Paul Moore wrote: >> On Tue, Aug 7, 2012 at 5:58 PM, John Stultz <john.stultz@linaro.org> >> wrote: >>> On 08/07/2012 02:50 PM, Paul Moore wrote: >>>> On Tue, Aug 7, 2012 at 2:12 PM, John Stultz <john.stultz@linaro.org> >>>> wrote: >>>>> Hi, >>>>> With my kvm environment using 3.6-rc1+, I'm seeing NULL pointer >>>>> dereferences in selinux_ip_postroute_compat(). It looks like the >>>>> sksec >>>>> value >>>>> is null and we die in the following line: >>>>> >>>>> if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto)) >>>>> >>>>> This triggers every time I shutdown the machine, but has also >>>>> triggered >>>>> randomly after a few hours. >>>>> >>>>> This is on an ubuntu 12.04 image, not using selinux. >>>> NOTE: Adding the SELinux list to the CC line >>> Thanks! >>> >>>> Hi, >>>> >>>> I'm trying to understand this and I was hoping you could you clarify a >>>> few things for me: >>>> >>>> * Is the panic in the Ubuntu 12.04 guest, or the host? If the host, >>>> could you share what distribution you are using? >>> Sorry, its a 12.04 guest. I think the host is Ubuntu 12.04 as well. >>> >>> >>>> * When you say you are not using SELinux, could you be more specific? >>>> It seems odd that you are not using SELinux but the panic is happening >>>> in a SELinux hook. >>> I just mean that, being Ubuntu, the system (userland) isn't >>> configured to >>> use selinux. SELinux is just enabled in the kernel config. >> Thanks for the quick response, I'll setup an Ubuntu guest and see if I >> can reproduce this ... something is odd. Anything non-standard about >> your guest install or anything else you think might be helpful? > Don't think so. Just a standard 64bit ubuntu 12.04 install. > > Since I'm booting kernel/initrd from the commandline, the initrd *may* > be older then 12.04, I can't quite remember when I copied that out of > the image. I'll see if it still triggers if I copy the current initrd > out.
Nope, that's not it, I just triggered the same thing w/ the Ubuntu 12.04 initrd on the image.
thanks -john
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