On Fri, 2009-08-07 at 16:42 -0400, Casey Dahlin wrote:
> On 08/06/2009 01:26 AM, Dave Airlie wrote:
>> On Mon, 2009-08-03 at 15:08 +0530, Rahul Sundaram wrote:
>>> Hi
>>>
>>> A few days back I ran into
>>>
>>>
http://lists.x.org/archives/xorg-devel/2009-July/001293.html
>>>
>>> I am wondering, since we are already using KMS in most places in Fedora,
>>> how far are we from achieving this by default in a Fedora release?
>> non-root X is a big security hole at the moment, and until we get
>> revoke() support in the kernel, we can probably move X to running as a
>> special user, and maybe once we get revoke to running as the real user.
>>
>> However it doesn't solve the issue how we know we need or don't need
>> root since X only figures out what graphics drivers are needed after
>> starting, so if you needed a non-kms gpu driver we wouldn't know
>> until after we'd started as non-root.
>>
>> Dave.
>>
> Why can't we just start as root or with the setuid bit, and use the standard
set*uid() calls to drop what we don't need once we know what we're doing?
>
We have to undo some stuff when X exits.
Dave.
I meant start as setuid, then determine if root was necessary at all. If it is, keep
running as root for the duration. If not, drop privileges.
--CJD