Re: [PATCH] Forbid invocation of kexec_load() outside initial PIDnamespace

From: Daniel P. Berrange
Date: Fri Aug 03 2012 - 08:52:14 EST

On Fri, Aug 03, 2012 at 05:45:40AM -0700, Eric W. Biederman wrote:
> The solution is to use user namespaces and to only test ns_capable on the magic reboot path.
> For the 3.7 timeframe that should be a realistic solution.

Hmm, that would imply that if LXC wants to allow reboot()/CAP_SYS_BOOT
they will be forced to use CLONE_NEWUSER. I was rather looking for a way
to allow the container to keep CAP_SYS_BOOT, without also mandating use
of user namespaces.

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