From: Chuck Ebbert <76306.1226@compuserve.com>
To: Gabriel Paubert <paubert@iram.es>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: desc v0.61 found a 2.5 kernel bug
Date: Tue, 29 Apr 2003 22:33:09 -0400 [thread overview]
Message-ID: <200304292234_MC3-1-369F-3000@compuserve.com> (raw)
Gabriel Paubert wrote:
>> And shouldn't CR3 be intitialized in case anyone actually wants to
>> switch back to the kernel TSS?
>
> For now no, since the only task gate ever taken (double fault), never
> returns (you don't want to update the TSS's CR3 field on every
> switch_to() so you would have to do it in the task gate return
> path, as well as having a correct LDT field).
I want to write a TSS-based debug exception handler that just does
an iret when it gets invoked. For now it looks easier to just keep
CR3 up-to-date on every switch.
> However, returning from a task gate is so much fraught with races wrt
> segment registers that the best thing to do is to avoid it.
Even with interrupts off?
------
Chuck
next reply other threads:[~2003-04-30 2:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-30 2:33 Chuck Ebbert [this message]
2003-04-30 17:10 ` desc v0.61 found a 2.5 kernel bug Gabriel Paubert
-- strict thread matches above, loose matches on Subject: below --
2003-05-11 3:50 Chuck Ebbert
2003-05-11 17:22 ` paubert
2003-05-09 8:58 Chuck Ebbert
2003-04-30 20:08 Chuck Ebbert
2003-05-08 22:54 ` paubert
2003-04-27 21:09 Chuck Ebbert
2003-04-28 10:34 ` Gabriel Paubert
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