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

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Message-ID: <CALCETrX1a8Bg=4qgDTPry1GUaWqQHprt+5JbvJJR=2eEa=33MA@mail.gmail.com>
Date:	Sun, 18 Oct 2015 09:12:53 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Stas Sergeev <stsp@...t.ru>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Brian Gerst <brgerst@...il.com>, X86 ML <x86@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit
 signal context

On Sun, Oct 18, 2015 at 6:36 AM, Stas Sergeev <stsp@...t.ru> wrote:
> 15.10.2015 00:41, Andy Lutomirski пишет:
>>>
>>> If this my
>>> understanding is correct and the flag is just an indication rather
>>> than a requested action, perhaps the name should be different,
>>> e.g. UC_SIG_FROM_32BIT or the like?
>>> Anyway, this is minor. :)
>>> I'll try to test the patch within a few days, thanks for you time!
>>
>> No problem.  Thanks for being willing to test!
>
> Hello Andy, I am unlucky at testing this.
> dosemu doesn't even start for me on the git kernels.
> After a half day of debugging, it seems the kernel forgets
> to fill in the "err" field in the sigcontext struct when
> page fault occurs. That confuses the dosemu's instruction
> decoder.
> Does this ring any bells?

No, but I can reproduce it on some kernels.  Let me see if I can fix it, too.

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC
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