Re: repost: patch for 2.1.108 LDT problems

Alan Cox (
Tue, 7 Jul 1998 18:28:06 +0100 (BST)

> 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
.align 4096 /* r1 */
.globl _start
movl _start, %edi /* S1 */
cmpb 0x80000000(%edi),%dl /* r2, S2 */
je nowhere /* r3 */
$ 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

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