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Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context

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On Wed, Oct 14, 2015 at 07:57:02PM +0300, Stas Sergeev wrote:
...
> > correct? This should work for us. Stas, mind to refresh my memory,
> > which ss value doesmu setups here?
>
> Nothing.
> Older dosemus didn't care about touching __pad0, so
> whatever kernel saves there, is still there, even when
> dosemu needs another value.
> The problem starts to happen IIRC when dosemu invalidates
> the LDT entry that was previously saved by the kernel as an SS.
> IIRC this was causing the SIGSEGV right from sigreturn().
> It is actually a bit annoying to have such bad code in kernel
> only for the sake of the older dosemu.

I see. Thanks a huge for info!
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[RFC 0/4] x86: sigcontext SS fixes, take 2 Andy Lutomirski <luto@kernel.org> - 2015-10-13 03:10 +0200
  [RFC 4/4] selftests/x86: Add tests for UC_SIGCONTEXT_SS and UC_STRICT_RESTORE_SS Andy Lutomirski <luto@kernel.org> - 2015-10-13 03:10 +0200
  [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context Andy Lutomirski <luto@kernel.org> - 2015-10-13 03:10 +0200
    Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-13 18:10 +0200
      Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Ingo Molnar <mingo@kernel.org> - 2015-10-14 17:10 +0200
        Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 17:20 +0200
      Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 18:50 +0200
        Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 19:50 +0200
          Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 20:10 +0200
            Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 20:40 +0200
              Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 21:00 +0200
                Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 23:40 +0200
                Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 23:50 +0200
    Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Cyrill Gorcunov <gorcunov@gmail.com> - 2015-10-14 18:50 +0200
      Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Andy Lutomirski <luto@amacapital.net> - 2015-10-14 18:50 +0200
        Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Cyrill Gorcunov <gorcunov@gmail.com> - 2015-10-14 19:00 +0200
      Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Stas Sergeev <stsp@list.ru> - 2015-10-14 19:00 +0200
        Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit  signal context Cyrill Gorcunov <gorcunov@gmail.com> - 2015-10-14 19:10 +0200
  [RFC 2/4] x86/signal/64: Fix SS if needed when delivering a 64-bit signal Andy Lutomirski <luto@kernel.org> - 2015-10-13 03:10 +0200

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