Messages in this thread | | | Date | Tue, 7 Jul 1998 17:47:49 -0400 (EDT) | From | George <> | Subject | Re: repost: patch for 2.1.108 LDT problems |
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On Tue, 7 Jul 1998, Alan Cox wrote:
>> 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. > >Interesting. Does this crash your K6 under 2.0.x ? > >On Mon, Jun 01, 1998 at 02:03:13PM +0200, Wolfgang Walter wrote: > >Here is how to reproduce it : > >$ cat a.s > .text > .align 4096 /* r1 */ > .globl _start >_start: > movl _start, %edi /* S1 */ > cmpb 0x80000000(%edi),%dl /* r2, S2 */ > je nowhere /* r3 */ > ret >$ as -o a.o a.s >$ ld -defsym nowhere=0xc0000000 a.o >$ ./a.out ><lockup. hard reset required> > >If so that indicates why we can't allow LDT usage by non root users on >AMD components
I thought the conclusion previously was that (inadvertantly) 2.1.x prevents this problem already by extending the segment to cover all of virtual memory?
(Too bad I have an Intel or I'd check.)
-George
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