Bug 203679 - kernel may not be using NX hardware where available
kernel may not be using NX hardware where available
Status: CLOSED NOTABUG
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
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i686 Linux
medium Severity medium
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Assigned To: Kernel Maintainer List
Brian Brock
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2006-08-22 21:49 EDT by Matthew Galgoci
Modified: 2007-11-30 17:11 EST (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
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Clone Of:
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Last Closed: 2007-04-23 14:51:45 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Matthew Galgoci 2006-08-22 21:49:28 EDT
Description of problem:

The kernel is reportedly not using hardware NX protection when available. I
would expect that on modern NX enabled processors that the kernel would use
hardware NX enforcement over segment limits.

Linux version 2.6.17-1.2583.fc6 (brewbuilder@hs20-bc1-6.build.redhat.com) (gcc
version 4.1.1 20060817 (Red Hat 4.1.1-18)) #1
 SMP Tue Aug 22 00:29:50 EDT 2006
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
 BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000d2000 - 00000000000d4000 (reserved)
 BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000007f6d0000 (usable)
 BIOS-e820: 000000007f6d0000 - 000000007f6e3000 (ACPI data)
 BIOS-e820: 000000007f6e3000 - 000000007f700000 (ACPI NVS)
 BIOS-e820: 000000007f700000 - 0000000080000000 (reserved)
 BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved)
 BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
 BIOS-e820: 00000000fed00000 - 00000000fed00400 (reserved)
 BIOS-e820: 00000000fed14000 - 00000000fed1a000 (reserved)
 BIOS-e820: 00000000fed1c000 - 00000000fed90000 (reserved)
 BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
 BIOS-e820: 00000000ff800000 - 0000000100000000 (reserved)
1142MB HIGHMEM available.
895MB LOWMEM available.
found SMP MP-table at 000f68c0
Using x86 segment limits to approximate NX protection
On node 0 totalpages: 521936
  DMA zone: 4096 pages, LIFO batch:0
  Normal zone: 225279 pages, LIFO batch:31
  HighMem zone: 292561 pages, LIFO batch:31
DMI present.

I'm not sure if the kernel is just misreporting or if NX is really not being
used. I'm not sure how to tell. It's been this way for a while though.

Version-Release number of selected component (if applicable):

2.6.17-1.2583.fc6

How reproducible:

Every boot.

Steps to Reproduce:
1. boot kernel
2. type dmesg | grep NX
  
Actual results:

$ dmesg | grep NX
Using x86 segment limits to approximate NX protection

Expected results:

Kernel should decide to use NX hardware when available and report as such.

Additional info:
Comment 1 David Lawrence 2006-09-05 11:30:00 EDT
Reassigning to correct owner, kernel-maint.
Comment 2 Dave Jones 2007-04-23 14:51:45 EDT
You need to install kernel-PAE to use NX

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