On Sat, May 27, 2017 at 2:30 PM, Yuhong Bao <[email protected]> wrote: > I don't like espfix of course, and would probably manually fix it to N in the > kernel config unless I really had to run buggy DPMI apps. > Win8 decided to just disable NTVDM by default instead. > ________________________________________ > From: Yuhong Bao > Sent: Saturday, May 13, 2017 2:39:59 AM > To: [email protected]; [email protected] > Subject: espfix and 5-level paging > > Instead of porting espfix to 5-level paging, why not fix the IRET instruction? > It probably should not require even a CR4 flag to enable.
I have no context here. It would be great if Intel and/or AMD were to fix IRET. Meanwhile, we can work around it in the kernel, which we do if MODIFY_LDT is on and configured to allow 16-bit segments. If you don't want 16-bit segments, you can turn them off. (This has nothing to do with buggy DPMI apps. It affects pretty much all 16-bit code.)
