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Re: [regression] x86/signal/64: Fix SS handling for signals delivered to 64-bit programs breaks dosemu

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From Stas Sergeev <stsp@list.ru>
Newsgroups linux.kernel
Subject Re: [regression] x86/signal/64: Fix SS handling for signals delivered to 64-bit programs breaks dosemu
Date Fri, 14 Aug 2015 01:00:02 +0200
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X-Original-Cc Linus Torvalds <torvalds@linux-foundation.org>, Raymond Jennings <shentino@gmail.com>, Cyrill Gorcunov <gorcunov@gmail.com>, Pavel Emelyanov <xemul@parallels.com>, Linux kernel <linux-kernel@vger.kernel.org>
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14.08.2015 01:29, Andy Lutomirski пишет:
> On Thu, Aug 13, 2015 at 3:25 PM, Stas Sergeev <stsp@list.ru> wrote:
>> 14.08.2015 01:11, Andy Lutomirski пишет:
>>
>>> Now suppose you set some magic flag and jump (via sigreturn,
>>> trampoline, whatever) into DOS code.  The DOS code loads 0x7 into FS
>>> and then gets #GP.  You land in a signal handler.  As far as the
>>> kernel's concerned, the FS base register is whatever the base of LDT
>>> entry 0 is.  What else is the kernel supposed to shove in there?
>> The same as what happens when you do in userspace:
>> ---
>> asm ("mov $0,%%fs\n");
>> prctl(ARCH_SET_FS, my_tls_base);
>> ---
>>
>> This was the trick I did before gcc started to use FS in prolog,
>> now I have to do this in asm.
>> But how simpler for the kernel is to do the same?
>>
>>> I think that making this work fully in the kernel would require a
>>> full-blown FS equivalent of sigaltstack, and that seems like overkill.
>> Setting selector and base is what you call an "equivalent of sigaltstack"?
> Yes.  sigaltstack says "hey, kernel! here's my SP for signal
> handling."  I think we'd need something similar to tell the kernel
> what my_tls_base is.  Using the most recent thing passed to
> ARCH_SET_FS is no good because WRFSBASE systems might not use
> ARCH_SET_FS, and we can't break DOSEMU on Ivy Bridge and newer as soon
> as we enable WRFSBASE.
If someone uses WRFSBASE and wants things to be preserved
in a sighandler, he'll just not set the aforementioned flag. No regression.
Whoever wants to use that flag properly, will not use WRFSBASE,
and will use ARCH_SET_FS or set_thread_area().
What exactly breakage do you have in mind?
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Thread

[regression] x86/signal/64: Fix SS handling for signals delivered to  64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-12 02:20 +0200
  Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-12 02:40 +0200
    Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-12 10:30 +0200
      Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-12 18:20 +0200
        Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-12 19:10 +0200
          Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-12 20:30 +0200
            Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-12 21:00 +0200
              Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-12 21:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-12 22:00 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-12 22:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-12 22:20 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-12 22:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-12 22:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-12 23:00 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-12 23:40 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 00:00 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 00:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals  delivered to 64-bit programs breaks dosemu Ingo Molnar <mingo@kernel.org> - 2015-08-13 10:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 12:20 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 14:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 17:00 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 17:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 17:40 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 18:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 18:20 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 18:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 18:40 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 18:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 18:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 19:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 19:20 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 19:20 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 20:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 20:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 20:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 20:40 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 20:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 18:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 13:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-12 22:50 +0200
  Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 17:40 +0200
    Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 17:50 +0200
      Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 18:20 +0200
        Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 18:30 +0200
          Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 18:40 +0200
            Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 18:50 +0200
            Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 18:50 +0200
      Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Brian Gerst <brgerst@gmail.com> - 2015-08-13 19:10 +0200
        Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-18 08:40 +0200
          Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-19 00:50 +0200
            Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-19 11:40 +0200
              Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-19 17:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-19 18:40 +0200
          Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-19 00:50 +0200
            Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-19 12:20 +0200
              Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-19 17:40 +0200
      Re: [regression] x86/signal/64: Fix SS handling for signals  delivered to 64-bit programs breaks dosemu Cyrill Gorcunov <gorcunov@gmail.com> - 2015-08-14 10:20 +0200
    Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 20:00 +0200
      Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 20:40 +0200
        Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 20:50 +0200
          Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 21:10 +0200
            Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 21:50 +0200
              Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 22:20 +0200
          Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 22:00 +0200
            Re: [regression] x86/signal/64: Fix SS handling for signals  delivered to 64-bit programs breaks dosemu Cyrill Gorcunov <gorcunov@gmail.com> - 2015-08-13 22:10 +0200
              Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 22:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Raymond Jennings <shentino@gmail.com> - 2015-08-13 23:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 23:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Raymond Jennings <shentino@gmail.com> - 2015-08-14 00:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 00:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 01:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 01:20 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Raymond Jennings <shentino@gmail.com> - 2015-08-14 01:40 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 01:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 02:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 00:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-14 00:20 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 00:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-14 00:40 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 01:00 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-14 01:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 01:20 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-14 02:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 02:20 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 02:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 03:00 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-14 03:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-14 03:40 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 04:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-18 08:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 03:40 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 02:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-14 02:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 02:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-14 02:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals  delivered to 64-bit programs breaks dosemu Cyrill Gorcunov <gorcunov@gmail.com> - 2015-08-14 09:30 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Pavel Emelyanov <xemul@parallels.com> - 2015-08-14 12:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals  delivered to 64-bit programs breaks dosemu Cyrill Gorcunov <gorcunov@gmail.com> - 2015-08-14 13:00 +0200
        Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 21:00 +0200
          Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Andy Lutomirski <luto@amacapital.net> - 2015-08-13 21:10 +0200
            Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 21:20 +0200
              Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 21:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 22:10 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-18 08:50 +0200
                Re: [regression] x86/signal/64: Fix SS handling for signals delivered  to 64-bit programs breaks dosemu Stas Sergeev <stsp@list.ru> - 2015-08-13 22:10 +0200

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