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    SubjectRe: repost: patch for 2.1.108 LDT problems
    On Tue, Jul 07, 1998 at 05:47:49PM -0400, George wrote:
    > 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?

    Hmm, the author of this little program was Benoit Poulot-Cazajous, and he had
    some ideas why 2.1.43 fixed that. I think he thought that it because the
    segment was extended and reducing it triggers the bug again. I think I'll
    search his mail about that tomorrow.

    Wolfgang Walter


    >
    > (Too bad I have an Intel or I'd check.)
    >
    > -George
    >
    >
    > -
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    --
    Veni, Vidi, VISA:
    I came, I saw, I did a little shopping.


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