Marking this Fix Released for Bionic which has a 4.15 based kernel now.
** Information type changed from Private to Public
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** Changed in: intel
Status: New => Fix Released
** Changed in: linux (Ubuntu Artful)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1645966
Title:
[Feature] GLK Enable UMIP - User Mode Instruction Prevention
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Artful:
Won't Fix
Bug description:
Executing user mode privileged instructions such as SMSW has been in the x86
processor since 80386 days. These instruction used by DOSEMU and other Software
to emulate x86 instructions.
Some comments from HPA below.
UMIP enabling is trivial (a CR4 bit), except that a handful of applications
(dosemu in particular) might depend on those instructions, especially SMSW. As
we don't want to make it too easy for an application to disable UMIP while
running, I'm wondering if we can use H.J.'s proposed flags scheme to mark that
an executable needs to disable UMIP.
On the other hand, if dosemu is the only app then it might be easier and
better to emulate in a trap handler
HW: Gemini Lake
Uptream schedule:
kernel:4.14
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