From: Blaisorblade <blaisorblade@yahoo.it>
To: user-mode-linux-devel@lists.sourceforge.net,
Young Koh <young.koh@gmail.com>
Subject: Re: [uml-devel] a question about sigsetjmp() in copy_from/to_user()
Date: Wed, 28 Sep 2005 18:43:57 +0200 [thread overview]
Message-ID: <200509281843.58875.blaisorblade@yahoo.it> (raw)
In-Reply-To: <3524bf1f05092807222f9d0aed@mail.gmail.com>
On Wednesday 28 September 2005 16:22, Young Koh wrote:
> so, as my understanding, sigsetjmp() is used for returning an error
> when there is a userspace and/or kernelspace address faulting in both
> skas and tt modes. and i386 implementation works the same way, i
> guess.
> my one quick question is (it could sound stupid,
Not at all.
> but) that why there
> may be a kernelspace faulting? kernel must correct and shouldn't
> access bad address, i guess, and if so, shouldn't it be a kernel
> panic?
cat /dev/kmem, as I already said (won't repeat the whole story here). Yes,
yes, yes, the kmem driver could check manually the address, but (same story
as the rest):
*) checking by hand is slower
*) not needed, because for i386 works and other archs conform to i386.
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
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prev parent reply other threads:[~2005-09-28 16:45 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-27 14:06 [uml-devel] a question about sigsetjmp() in copy_from/to_user() Young Koh
2005-09-27 17:28 ` Jeff Dike
2005-09-28 11:59 ` Blaisorblade
2005-09-28 13:47 ` Young Koh
2005-09-28 14:50 ` Jeff Dike
2005-09-28 19:25 ` Young Koh
2005-09-29 12:09 ` Blaisorblade
2005-09-30 15:08 ` Young Koh
2005-09-30 15:44 ` Geert Uytterhoeven
2005-10-02 1:03 ` Jeff Dike
2005-10-02 10:23 ` Blaisorblade
2005-10-02 18:31 ` Jeff Dike
2005-10-03 18:35 ` Blaisorblade
2005-10-03 20:38 ` Jeff Dike
2005-09-28 16:09 ` Jeff Dike
2005-09-28 17:26 ` Blaisorblade
2005-09-28 18:43 ` Jeff Dike
2005-09-28 8:41 ` Blaisorblade
2005-09-28 14:22 ` Young Koh
2005-09-28 16:43 ` Blaisorblade [this message]
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