Pagemap: security fixes vs. ABI compatibility [LWN.net]

Pagemap: security fixes vs. ABI compatibility

Posted May 11, 2015 15:08 UTC (Mon) by nix (subscriber, #2304)
In reply to: Pagemap: security fixes vs. ABI compatibility by alkbyby
Parent article: Pagemap: security fixes vs. ABI compatibility

On one side we have very dubious _hardware_ bug that can be potentially used as vulnerability.

I think 'has actually been used as a vulnerability' would be a better way of putting this, given that exploits have been demonstrated, and that the physical pfn info provided by pagemap is essential to escalate this from a DoS that crashes things at random to an exploit that lets you futz with the guts of the kernel to such an extent that you can execute arbitrary code in kernel space.