Searching smi software vulnerabilities

OpenBSD and NetBSD permit usermode code to kill

securelevel | privileges | Management | replacing | /dev/xf86 | usermode | display | OpenBSD | System | allows | reduce | device | server | permit | NetBSD | write | local | which | users | XOrg | Mode | root | kill | code |

OpenBSD and NetBSD permit usermode code to kill the display server and write to the X.Org /dev/xf86 device, which allows local users with root privileges to reduce securelevel by replacing the System Management Mode (SMM) handler via a write to an SMRAM address within /dev/xf86 (aka the video card memory-mapped I/O range), and then launching the new handler via a System Management Interrupt (SMI), as demonstrated by a write to Programmed I/O port 0xB2.


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