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Tasklist

FS#41885 - NX (Execute Disable) protection cannot be enabled: non-PAE kernel!

Attached to Project: Arch Linux
Opened by Philipp (hollunder) - Tuesday, 09 September 2014, 07:49 GMT
Last edited by Jan de Groot (JGC) - Wednesday, 10 September 2014, 12:03 GMT
Task Type Bug Report
Category Packages: Core
Status Closed
Assigned To No-one
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:
[ 0.000000] Notice: NX (Execute Disable) protection cannot be enabled: non-PAE kernel!

I thought it was common to enable PAE nowadays?

I run into more and more issues (probably unrelated: no USB today!), and this is just the first weirdness of many I found in dmesg.

Additional info:
* package version(s)
linux 3.16.1-1 i686

* config and/or log files etc.


Steps to reproduce:
Boot and look at dmesg.
This task depends upon

Closed by  Jan de Groot (JGC)
Wednesday, 10 September 2014, 12:03 GMT
Reason for closing:  Won't implement
Comment by Matthias Dienstbier (fs4000) - Tuesday, 09 September 2014, 18:50 GMT
 FS#20338 ,  FS#34324 , http://cl4ssic4l.wordpress.com/2011/05/24/linus-torvalds-about-pae/

=> use 64 bit!
Comment by Philipp (hollunder) - Tuesday, 09 September 2014, 22:00 GMT
Well, OK, a rant I don't understand.

Is there a relatively painless way to migrate to a 64 bit kernel and userspace?
Comment by Daniel Micay (thestinger) - Wednesday, 10 September 2014, 00:58 GMT
If you're using 64-bit hardware, you should really be using the x86_64 package architecture. The improved ASLR on 64-bit is almost as important as NX from a security perspective.

If you really want NX on 32-bit you can use the linux-grsec package, although it's a (cheap) software implementation since it doesn't use PAE either.
Comment by Jan de Groot (JGC) - Wednesday, 10 September 2014, 08:32 GMT
It's also possible to run a 64bit kernel with 32bit userland. At this moment we don't provide packages for this configuration, but it should be possible to ignore architecture and install an x86_64 kernel to your i686 system. The problem is keeping that up2date, as you have to do this manually on every kernel update.
Comment by Philipp (hollunder) - Wednesday, 10 September 2014, 08:48 GMT
I guess I'll try this migration guide: https://wiki.archlinux.org/index.php/Migrating_Between_Architectures_Without_Reinstalling
Hope that it works...

EDIT: Not without hickup, but it seems to have worked.

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