This is the mail archive of the cygwin@sourceware.cygnus.com mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]

Re: WARNING: Serious Pentium Bug


Just to keep everyone from getting too scared, this really would only matter
for secure sites with multiple users -- that particular sequence is a
nonsense instruction.  The only folks using it would be those deliberately
wanting to bring the system down.

 Here it is decoded: lock cmpxchg8b eax

BTW, I haven't tested it, so I don't know if this is even true.  It should
generate an illegal instruction exception, since the operand needs to be a
memory reference.


- Tim Iverson
  iverson@lionheart-com


+----------------
| Date: Fri, 7 Nov 1997 21:54:23 -0500
| From: Anonymous <anon@anon.efga.org>
| Subject: WARNING: Serious Pentium Bug
| To: gnu-win32@cygnus.com
| 
| code will crash any machine running on a pentium CPU, MMX or no 
| char x [5] = { 0xf0, 0x0f, 0xc7, 0xc8 };
...
| This require no special permissions to run, it works fine with
| average-joe-userspace permissions. I have verified this, it works.
-
For help on using this list (especially unsubscribing), send a message to
"gnu-win32-request@cygnus.com" with one line of text: "help".


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]