[libvirt] [PATCH v2 REPOST 2/8] Qemu arbitrary command-line arguments.

Eric Blake eblake at redhat.com
Fri Jul 2 13:32:29 UTC 2010

On 07/02/2010 07:29 AM, Chris Lalancette wrote:
>> Technically, any string that does not contain = can be inserted as an
>> environment name, but then you can't access them from the shell.  So
>> it's best to restrict environment names to portable names (basically,
>> the same set as shell variable names).
> Interesting point.  Since we are directly invoking qemu with execve, in
> theory, qemu could access an environment name that doesn't conform to the
> shell's rules.  That being said, since many people are invoking qemu through
> a shell, I doubt qemu would do something like that.
> So what do we think; add the restriction, or no?

I'm in favor of adding the restriction.  Otherwise, we are allowing a
backdoor where libvirt can make qemu do something that regular shell
invocation of qemu cannot.

Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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