[Bug 83716] Re: Linux image contains buggy alternatives code

[Marco Rodrigues]

** Changed in: linux-source-2.6.17 (Ubuntu)
   Status: Fix Committed = Fix Released

** Changed in: linux-source-2.6.15 (Ubuntu)
   Status: Fix Committed = Fix Released

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Matt Zimmerman]

New CD images will be available next week with the release of 7.04, and
will include this fix

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Michael]

Will that include a new Dapper server image?  I can see that the Edgy CD
images will be less relevant after Feisty is released.

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Michael]

Will this also get fixed on the installer CDs?  It affects quite a few
people installing to virtual machines.

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Kyle McMartin]

** Changed in: linux-source-2.6.15 (Ubuntu)
   Status: Confirmed = Fix Committed

** Changed in: linux-source-2.6.17 (Ubuntu)
   Status: Confirmed = Fix Committed

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Kyle McMartin]

The information you posted was sufficient, Cristian is just using a cut
 paste solution and not reading your report at all. Please ignore him,
he doesn't know what he's doing.

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Kyle McMartin]

Will fix this in the next security upload.

** Changed in: linux-source-2.6.17 (Ubuntu)
   Importance: Undecided = High
 Assignee: (unassigned) = Kyle McMartin
   Status: Needs Info = Confirmed

** Also affects: linux-source-2.6.15 (Ubuntu)
   Importance: Undecided
   Status: Unconfirmed

** Changed in: linux-source-2.6.15 (Ubuntu)
   Importance: Undecided = High
 Assignee: (unassigned) = Kyle McMartin
   Status: Unconfirmed = Confirmed

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Michael]

I will post the information that you requested later.  I am surprised,
though that the information I provided was not sufficient.  The link
which I provided (http://lkml.org/lkml/2006/10/16/299) contains both the
LKML discussion of the bug and the patch required to fix it.  I have
checked the Edgy kernel sources, and the patch clearly applies to them
(there are no Ubuntu-specific changes to the affected function against
vanilla 2.6.18, from whence the function was backported).

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Michael]

Included below is the information you requested.  uname -a says:

Linux test-desktop 2.6.17-10-generic #2 SMP Tue Dec 5 22:28:26 UTC 2006
i686 GNU/Linux

Note that:

1) The bug can be worked around by specifying the noreplacement kernel option
2) The bug has also been backported to the Dapper SMP kernel, but without the 
workaround
3) As I said, this is the patch to arch/i386/kernel/alternative.c which fixes 
the problem:

 void __init alternative_instructions(void)
 {
+   unsigned long flags;
if (no_replacement) {
printk(KERN_INFO (SMP-)alternatives turned off\n);
free_init_pages(SMP alternatives,
@@ -396,6 +397,8 @@ void __init alternative_instructions(voi
(unsigned long)__smp_alt_end);
return;
}
+
+   local_irq_save(flags);
apply_alternatives(__alt_instructions, __alt_instructions_end);
 
/* switch to patch-once-at-boottime-only mode and free the
@@ -433,4 +436,5 @@ void __init alternative_instructions(voi
alternatives_smp_switch(0);
}
#endif
-}
+   local_irq_restore(flags);
+}

** Attachment added: dmesg.log
   http://librarian.launchpad.net/6491322/dmesg.log

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Michael]

** Attachment added: dmidecode.log
   http://librarian.launchpad.net/6491330/dmidecode.log

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Michael]

** Attachment added: lspci -vvnn
   http://librarian.launchpad.net/6491331/lspci-vvnn.log

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Michael]

Sorry, above patch was just cut and pasted and does not quite match the
current Edgy kernel.  The attached diff was against the Edgy kernel.


** Attachment added: Diff to fix arch/i386/kernel/alternatives.c
   http://librarian.launchpad.net/6492019/alternatives.diff

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Cristian Aravena Romero]

Thanks for taking the time to report this bug. Unfortunately we can't
fix it, because your description didn't include enough information.

Please include the following additional information, if you have not
already done so (please pay attention to lspci's additional options), as
required by the Ubuntu Kernel Team:

0. Pliss update you BIOS.
1. Please include the output of the command uname -a in your next response. 
It should be one, long line of text which includes the exact kernel version 
you're running, as well as the CPU architecture.
2. Please run the command dmesg  dmesg.log and attach the resulting file 
dmesg.log to this bug report.
3. Please run the command lspci -vvnn  lspci-vvnn.log and attach the 
resulting file lspci-vvnn.log to this bug report.
4. Please run the command sudo dmidecode  dmidecode.log and attach the 
resulting file dmidecode.log to this bug report.

For your reference, the full description of procedures for kernel-
related bug reports is available here:
http://wiki.ubuntu.com/DebuggingKernelProblems Thanks!

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Cristian Aravena Romero]

Change status of Unconfirmed to Needs Info.

** Changed in: linux-source-2.6.17 (Ubuntu)
   Status: Unconfirmed = Needs Info

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[Bug 83716] Re: Linux image contains buggy alternatives code

[Michael]

See this posting:

http://lkml.org/lkml/2006/10/16/299

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