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From: David Martin <taldmd@gmail.com>
To: linux-kernel@vger.kernel.org
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Subject: Re: x86: not showing f00f bug correctly in /proc/cpuinfo
Date: Sat, 15 Mar 2008 20:20:50 +0100
References: <0823A347-CBEA-40DC-B07B-8A699038EB4C@gmail.com>
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Hi,

This also could be interesting:

Executing a test program taken from

http://lwn.net/2001/0329/a/ltp-f00f.php3

  $ ./f00f.o
Testing for proper f00f instruction handling.
Segmentation fault
  $ dmesg
......
BUG: unable to handle kernel paging request at virtual address ffffb030
printing eip: 08049678 *pde = 00296067 *pte = 00271061
Oops: 0003 [#1]

Pid: 1838, comm: f00f.o Not tainted (2.6.24 #5)
EIP: 0073:[<08049678>] EFLAGS: 00010246 CPU: 0
EAX: 08049678 EBX: b7f36ff4 ECX: 0000002e EDX: b7f380d0
ESI: 00000000 EDI: 08048350 EBP: bfbcf608 ESP: bfbcf5dc
  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
Process f00f.o (pid: 1838, ti=c46b0000 task=c12299a0 task.ti=c46b0000)
EIP: [<08049678>]  SS:ESP 007b:bfbcf5dc
---[ end trace 52e28d53c342d03a ]---
....

Is that patch working correctly?

Cheers,

David.