Re: [Xen-devel] Patch "x86/entry/64: Remove %ebx handling from error_entry/exit" has been added to the 4.9-stable tree

[Andy Lutomirski <luto@xxxxxxxxxxxxxx>]

> On Nov 28, 2018, at 6:56 AM, David Woodhouse <dwmw2@xxxxxxxxxxxxx> wrote:
> 
>> On Wed, 2018-08-22 at 09:19 +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
>> This is a note to let you know that I've just added the patch titled
>> 
>>    x86/entry/64: Remove %ebx handling from error_entry/exit
>> 
>> to the 4.9-stable tree which can be found at:
>>    
>> http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>> 
>> The filename of the patch is:
>>     x86-entry-64-remove-ebx-handling-from-error_entry-exit.patch
>> and it can be found in the queue-4.9 subdirectory.
> 
> Can we have it for 4.4 too, please?
> 
>> [ Note to stable maintainers: this should probably get applied to all
>>  kernels.  If you're nervous about that, a more conservative fix to
>>  add xorl %ebx,%ebx; incl %ebx before the jump to error_exit should
>>  also fix the problem. ]
> 
> Can we assume it's always from kernel? The Xen code definitely seems to
> handle invoking this from both kernel and userspace contexts.

I learned that my comment here was wrong shortly after the patch landed :(


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