Re: repost: patch for 2.1.108 LDT problems

Marcus Meissner (
Tue, 7 Jul 1998 19:18:29 +0200 (METDST)

Hi Alan, linux-kernel

In article <> you write:
>> The attached patch is an update for 2.1.108 of the previous patch to fix
>> various LDT-related problems.
>> The patch ensures that each clone task using an LDT gets its own slot in
>> the GDT, in case the prior task exits first. It also adds some sanity
>> checks when LDT entries are being changed, and improves the register
>> dump routine to display additional information.
>There is one other thing we really need here. Given the AMD K6 bug and the
>fact AMD are it seems choosing to ignore all email on the segment bug that
>lets any user lock up the K6 we ought to check for a K6 and refuse to let
>anyone but root add LDT entries. That way the chip isnt crashable by
>normal users in 2.1.x

If you do, please make it a sysctl'able option. At least on my AMD-K6-PR2/200
I have not experienced lockups/crashes yet.

Ciao, Marcus

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