Re: [dpdk-dev] [PATCH 2/2] uio: new driver to support PCI MSI-X

Michael S. Tsirkin
2015-10-06T14:07:24Z

On Tue, Oct 06, 2015 at 03:15:57PM +0300, Avi Kivity wrote:
> btw, (2) doesn't really add any insecurity. The user could already poke at
> the msix tables (as well as perform DMA); they just couldn't get a useful
> interrupt out of them.

Poking at msix tables won't cause memory corruption unless msix and bus
mastering is enabled. It's true root can enable msix and bus mastering
through sysfs - but that's easy to block or detect. Even if you don't
buy a security story, it seems less likely to trigger as a result
of a userspace bug.

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MST