From: Jeff Dike <jdike@addtoit.com>
To: Blaisorblade <blaisorblade@yahoo.it>
Cc: 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 12:09:46 -0400 [thread overview]
Message-ID: <20050928160946.GB12888@ccure.user-mode-linux.org> (raw)
In-Reply-To: <200509281359.48449.blaisorblade@yahoo.it>
On Wed, Sep 28, 2005 at 01:59:48PM +0200, Blaisorblade wrote:
> That wasn't the original reason - this is fine too, but as I explained in the
> other mail, cat /dev/kmem will cause a copy_to_user() with invalid kernel
> ("from") address. I remember because I discussed this with you at length.
Oh yeah. I was thinking there was a different (and better) reason, but I
couldn't remember what it was.
Also, my reason isn't that good anyway. I had a different fix a while ago,
but it got lost somewhere. I added an arch hook to get_free_pages which
touched each allocated page under the cover of a setjmp. If a page couldn't
be allocated on the host, then it is put on a "bad pages" list, and another
page is allocated instead.
Jeff
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next prev parent reply other threads:[~2005-09-28 17:13 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 [this message]
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
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