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Bug#880441: linux-image-4.13.0-1-amd64: silently enabled AppArmor breaks other programs



Control: severity -1 important
Control: affects -1 tor

On Tue, 2017-10-31 at 16:07 +0100, Christoph Anton Mitterer wrote:
> Package: src:linux
> Version: 4.13.10-1
> Severity: critical
> Justification: breaks unrelated software
>
> Apparently AppArmor was enabled per default in the last version.

Although you can disable it (security=dac or apparmor=0) if you want.

> While I'm usually in favour of anything that improves security
> (leaving aside the question here whether SELinux wouldn't be the much
> more powerful solution ;-) )... this happened too silent (e.g. no
> NEWS entry)... peopl may not even have installed the userland tools.

The change was noted in the changelog, so it's not silent.

I intend to add a NEWS entry in the next linux-latest upload.  It
doesn't make sense to add NEWS to linux-image-* packages as that will
only be displayed for upgrades that don't involve an ABI bump

My understanding was that enabling AppArmor shouldn't do very much
until a policy is loaded (which it won't be if you don't install the
userland tools).  As you've found, that isn't entirely correct.

> Also it breaks unrelated software, e.g. tor no longer starts and some
> more as well.

Applications built for Linux are unrelated to Linux?  I don't think so.

Ben.

-- 
Ben Hutchings
It is a miracle that curiosity survives formal education. - Albert
Einstein

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