Tested on Trusty via the Wily LTS enablement package.
# dpkg -l linux-image-generic-lts-wily
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture
Description
+++-================================-=====================-=====================-=====================================================================
ii linux-image-generic-lts-wily 4.2.0.19.14 i386
Generic Linux kernel image
dpkg -l dosemu
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture
Description
+++-================================-=====================-=====================-=====================================================================
ii dosemu 1.4.0.7+20130105+b028 i386
DOS Emulator for Linux
This allowed the dosemu 1.4.0 package to start up MS-DOS 6.22
Microsoft(R) MS-DOS(R) Version 6.22
(C)Copyright Microsoft Corp 1981-1994.
C:\>
C:\>
C:\>dir
Volume in drive C is mu/drives/c
Directory of C:\
MSDOS SYS 38,138 05-14-14 7:40p
COMMAND COM 54,645 05-14-14 7:40p
DOSEMU <DIR> 11-12-15 3:51p
IO SYS 40,774 05-14-14 7:40p
4 file(s) 133,557 bytes
2,147,450,880 bytes free
Have you applied the fix
http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=2459ee8651dc5ab72790c2ffa99af288c7641b64
I'm sure it's needed too?
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1499089
Title:
Please enable kconfig X86_LEGACY_VM86 for i386
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Wily:
Fix Released
Bug description:
In order for dosemu to reach maximum performance (a > 10x speedup) please
enable kconfig X86_LEGACY_VM86 in the kernel. As of this commit
http://www.spinics.net/lists/linux-tip-commits/msg30360.html
the overzealous kconfig message that seemed to suggest that the vm86()
syscall was a security hazard in itself has been revised to reflect reality.
Also please note that even if this kconfig option is enabled the runtime
default is still off as vm86 is only actually enabled if the sysctl
vm.mmap_min_addr is set to 0. That said, allowing vm.mmap_min_addr=0 is a
known security risk and enabling the vm86() syscall to operate additionally
would add little value to any potential attacker.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1499089/+subscriptions
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