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Date: Wed, 22 Aug 2001 15:52:26 -0400
From: Paul <set@pobox.com>
To: Andi Kleen <ak@suse.de>
Cc: Brian Gerst <bgerst@didntduck.org>, linux-kernel@vger.kernel.org,
        alan@lxorguk.ukuu.org.uk, Wilfried.Weissmann@gmx.at
Subject: Re: [OOPS] repeatable 2.4.8-ac7, 2.4.7-ac6 just run xdos
Message-ID: <20010822155226.A228@squish.home.loc>
Mail-Followup-To: Paul <set@pobox.com>, Andi Kleen <ak@suse.de>,
	Brian Gerst <bgerst@didntduck.org>, linux-kernel@vger.kernel.org,
	alan@lxorguk.ukuu.org.uk, Wilfried.Weissmann@gmx.at
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Andi Kleen <ak@suse.de>, on Wed Aug 22, 2001 [03:22:03 PM] said:
> 
> Here is a new patch with both checks.
> 

	Dear Andi;

	Well, with this patch, the kernel doesnt oops, but vm86
seems to be busted now. save_v86_state() pops out:
	'vm86: could not access userspace vm86_info'
and gives dosemu a segv.

Paul
set@pobox.com

> 
> --- include/asm-i386/hw_irq.h-SEG2	Mon Aug 20 02:54:53 2001
> +++ include/asm-i386/hw_irq.h	Wed Aug 22 13:02:16 2001
> @@ -114,8 +114,10 @@
>  	"cmpl %eax,7*4(%esp)\n\t"  \
>  	"je 1f\n\t"  \
>  	"movl %eax,%ds\n\t" \
> +	"1: cmpl %eax,8*4(%esp)\n\t" \
> +	"je 2f\n\t" \
>  	"movl %eax,%es\n\t" \
> -	"1:\n\t"
> +	"2:\n\t"
>  
>  #define IRQ_NAME2(nr) nr##_interrupt(void)
>  #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
> --- arch/i386/kernel/entry.S-SEG2	Sat Aug 18 08:41:53 2001
> +++ arch/i386/kernel/entry.S	Wed Aug 22 15:07:44 2001
> @@ -292,8 +292,11 @@
>  	cmpl %edx,%ecx
>  	jz	1f
>  	movl %edx,%ds
> +1:	movl %ds,%ecx
> +	cmpl $(__KERNEL_DS),%edx
> +	jz   2f	
>  	movl %edx,%es
> -1:	GET_CURRENT(%ebx)
> +2:	GET_CURRENT(%ebx)
>  	call *%edi
>  	addl $8,%esp
>  	jmp ret_from_exception
> 
> 
> -Andi