Linux Accidentally Left Legacy I/O & Memory Handlers Open In Kernel Lockdown Mode
For nearly the past decade has been the kernel lockdown mode for tightening up kernel access from user-space such as when UEFI Secure Boot is enabled. The kernel lockdown mode restricts PCI BAR access, no writing to /dev/mem, and other restrictions so user-space can't can't modify the running kernel or access sensitive kernel memory. An oversight has allowed legacy I/O and memory interfaces via…
We haven't written up this one. Phoronix has the full story — the link below goes straight to it.
