Messages in this thread | | | Date | Tue, 29 Apr 2003 22:33:09 -0400 | From | Chuck Ebbert <> | Subject | Re: desc v0.61 found a 2.5 kernel bug |
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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?
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