[Bug 449340] [NEW] linux-rt does not provide hardware NX protection

[Laurent Bonnaud]

Public bug reported:

Hi,

here is the problem:

$ dmesg | grep NX
[    0.000000] Using x86 segment limits to approximate NX protection
[...]

And indeed, PAE, which is necessary to have NX protection, is not set in
the kernel config:

$ grep PAE /boot/config-2.6.31-7-rt
[nothing]

This contrasts with linux-image-2.6.31-13-generic-pae where:

$ dmesg | grep NX
[    0.000000] NX (Execute Disable) protection: active
[...]

$ grep PAE /boot/config-2.6.31-13-generic-pae
CONFIG_X86_PAE=y

So currently I have to choose between increased security and low latency
(my choice is security).

How about providing a linux-rt-pae kernel flavor ?

ProblemType: Bug
Architecture: i386
Date: Mon Oct 12 10:30:17 2009
DistroRelease: Ubuntu 9.10
Package: linux-image-2.6.31-7-rt 2.6.31-7.9
ProcVersionSignature: Ubuntu 2.6.31-7.9-rt
SourcePackage: linux-rt
Uname: Linux 2.6.31-7-rt i686
XsessionErrors:
 (polkit-gnome-authentication-agent-1:4324): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-settings-daemon:4341): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed

** Affects: linux-rt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386

-- 
linux-rt does not provide hardware NX protection
https://bugs.launchpad.net/bugs/449340
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