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    SubjectRe: repost: patch for 2.1.108 LDT problems
    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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