Re: [uml-devel] starting an 32 bit x86 chroot uml image at a ahrdened Gentoo amd64 system fails

[Richard Weinberger <richard@nod.at>]

Am 16.03.2015 um 14:23 schrieb Toralf Förster:
> On 03/15/2015 05:56 PM, Richard Weinberger wrote:
>> Then please move the hardened gcc to /dev/null. ;-)
> 
> yes, at least to compile the UML linux
> 
>> If you can tell me what hardening feature is the root cause I can think of a solution.
> Will be a longer way I fear.
> Every 2nd or 3rd attempt the UML guest hangs during boot, an immediate attempt works - so really hard to dig into the root cause.
> 
> But I'll try it.

I did some further investigation. The root cause of the gentoo hardened system seems to be the hardened libc.
As soon a UML kthread issues a syscall on the host side UML dies.
At least on my PC I can build and run UML with the hardened gcc. But running any UML on a hardened base system (libc) fails badly.

> In moment my biggest problem is, that I get the following error as soon as I try to send out an network package from eth0 (DHCP works, but the first ping to an ip address outside triggers the error):

Does this also happen on a regular system? Because here networking works fine.

Thanks,
//richard

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