On Wed, Jan 05, 2022 at 02:25:41PM +0800, Kai-Heng Feng wrote: > This patch breaks ioperm() usage from userspace programs with CAP_SYS_RAWIO cap. > > I wonder if it's possible to revert this commit? When lockdown is enabled, or under all circumstances? It's expected to be blocked when lockdown is enabled - allowing userland to use port IO would potentially allow reconfiguration of PCI devices in ways that could alter kernel behaviour in ways relevant to security, which is what lockdown aims to prevent. What's being broken by this?
