Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1499089
Title:
Please enable kconfig X86_LEGACY_VM86 for i386
Status in linux package in Ubuntu:
New
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.
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