stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and default it to 'n')

From	Stas Sergeev <stsp@list.ru>
Newsgroups	linux.kernel
Subject	stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and default it to 'n')
Date	2015-09-02 11:40 +0200
Message-ID	<q4cGm-17b-15@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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https://lkml.org/lkml/2015/7/21/208

Guys, you gonna be kidding.
Is this a new trend of breaking dosemu, or what?

> VM86 is entirely broken if ptrace, syscall auditing, or
> NOHZ_FULL is in use.  The code is a big undocumented mess, it's
> a real PITA to test, and it looks like a big chunk of vm86_32.c

It is a CPU feature that kernel should support, and always
did without any problems. If it started to have problems because
of your actions, then you can as well fix your code.

 > No one should be using it anyway. Use DOSBOX or KVM instead.

Have you done the benchmarks between dosbox and dosemu
before saying that? Please do, thanks. (don't forget to include
dosemu2 in your benchmarks too, as it outperforms both)

> Let's accelerate its slow death.


 > + Enabling this option adds considerable attack surface to the
 > + kernel and slows down system calls and exception handling.

Yes, I realize that threatening people with the "considerable attack 
surface"
is a good way to "accelerate its slow death", but please care to explain
that attack surface, thankyou.
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stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-02 11:40 +0200
  Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Andy Lutomirski <luto@amacapital.net> - 2015-09-02 16:10 +0200
    Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Kees Cook <keescook@chromium.org> - 2015-09-02 17:40 +0200
    Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-02 19:40 +0200
    Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Josh Boyer <jwboyer@fedoraproject.org> - 2015-09-02 19:50 +0200
      Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-02 20:00 +0200
        Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Josh Boyer <jwboyer@fedoraproject.org> - 2015-09-02 22:30 +0200
          Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-02 22:50 +0200
            Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Andy Lutomirski <luto@amacapital.net> - 2015-09-02 23:00 +0200
              Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Josh Boyer <jwboyer@fedoraproject.org> - 2015-09-02 23:00 +0200
              Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-02 23:10 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Andy Lutomirski <luto@amacapital.net> - 2015-09-02 23:50 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-02 23:50 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-03 14:20 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-03 14:20 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-03 17:50 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-03 18:40 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-03 21:00 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-03 23:30 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86  and default it to 'n') Chuck Ebbert <cebbert.lkml@gmail.com> - 2015-09-04 12:10 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-04 12:50 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-04 14:40 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-04 15:10 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-04 22:00 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-04 23:20 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-04 23:30 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Raymond Jennings <shentino@gmail.com> - 2015-09-05 00:50 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-05 01:20 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-04 00:40 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-03 19:00 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Andy Lutomirski <luto@amacapital.net> - 2015-09-03 19:30 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-03 19:40 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-03 19:30 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-03 19:20 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Stas Sergeev <stsp@list.ru> - 2015-09-03 14:10 +0200
                Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-03 14:10 +0200
      Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Kees Cook <keescook@chromium.org> - 2015-09-02 20:00 +0200
        Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Josh Boyer <jwboyer@fedoraproject.org> - 2015-09-02 22:30 +0200
      Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Andy Lutomirski <luto@amacapital.net> - 2015-09-02 20:20 +0200
        Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and  default it to 'n') Josh Boyer <jwboyer@fedoraproject.org> - 2015-09-02 22:30 +0200

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