Messages in this thread | | | Date | Tue, 07 Aug 2012 15:26:48 -0700 | From | John Stultz <> | Subject | Re: NULL pointer dereference in selinux_ip_postroute_compat |
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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.
thanks -john
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