Re: [v6 PATCH 00/21] x86: Enable User-Mode Instruction Prevention

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


11.03.2017 02:47, Ricardo Neri пишет:

It doesn't need to be a matter of this particular
patch set, i.e. this proposal should not trigger a
v7 resend of all 21 patches. :) But it would be useful
for the future development of dosemu2.
Would dosemu2 use 32-bit processes in order to keep segmentation? If it
could use 64-bit processes, emulation is not used in this case and the
SIGSEGV is delivered to user space.
It does use the mix: 64bit process but some segments
are 32bit for DOS code.
Do you mean that dosemu2 will start as a 64-bit process and will jump to
32-bit code segments?
Yes, so the offending insns are executed only in 32bit
and 16bit segments, even if the process itself is 64bit.
I guess you handle 16bit segments same as 32bit ones.

  My emulation code should work in this case as it
will use segmentation in 32-bit code descriptors. Is there anything else
If I understand you correctly, you are saying that SLDT
executed in 64bit code segment, will inevitably segfault
to userspace. If this is the case and it makes your code
simpler, then its perfectly fine with me as dosemu does
not do this and the 64bit DOS progs are not anticipated.
To unsubscribe from this list: send the line "unsubscribe linux-msdos" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at

[Index of Archives]     [Linux Console]     [Linux Audio]     [Linux for Hams]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite Camping]     [Yosemite Hiking]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Samba]     [Linux Media]     [Fedora Users]

  Powered by Linux