Re: Add a "enable" sysfs attribute to the pci devices to allow userspace (Xorg) to enable devices without doing foul direct access
From: Jon Smirl
Date: Tue May 02 2006 - 21:25:18 EST
On 5/2/06, Matthew Wilcox <matthew@xxxxxx> wrote:
On Tue, May 02, 2006 at 05:52:09PM -0400, Jon Smirl wrote:
> Have you seen this method of getting root from X?
> It is referenced from Theo de Raadt interview on kerneltrap
That's a great indication of why securelevels aren't.
It pretty much fits the Linux model of "once you're root, you can do
anything". The POSIX Capabilities really don't help either.
I suppose SELinux might be able to help, but I don't care to get into
that discussion here ;-)
And there is the root exploit found by Coverity this week too:
X is multiple megabytes of code needlessly running as root. If we
could convince X to use device drivers to talk to the hardware it
wouldn't need to run as root. This is part of why I am against this
patch, it is another crutch to let X keep on running as root instead
of fixing the underlying problem.
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