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From: Stas Sergeev <stssppnn@yahoo.com>
Reply-To: stas.orel@mailcity.com
To: Manfred Spraul <manfred@colorfullife.com>
Subject: Re: [CFT] error checking for VM86 instruction emulation
Date: Wed, 26 Dec 2001 01:58:23 +0300
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Manfred Spraul wrote:
> The emulation code for the instructions that cannot be executed in vm86
> mode directly (iretd, pushf and a few others) accesses user space memory
> without an exception handler. This can cause a kernel oops if the stack
> pointer points to non-present or read-only memory areas.
> 
> The attached patch adds these handlers, but I can't test them properly.
> Under 2.5.2-pre1, dosemu still runs.
> 
> The patch applies to both 2.4.17 and 2.2.20. Please test it.
It works. The Oops is no longer reproduceable at all (it was 100% reproduceable
before) so I vote for integrating this patch into kernel:)

Thank you.
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