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SubjectRe: [PATCH 0/5] i387: stable kernel backport
On Wed, Feb 22, 2012 at 01:32:53PM -0800, Greg Kroah-Hartman wrote:
> On Wed, Feb 22, 2012 at 01:29:11PM -0800, Linus Torvalds wrote:
> > On Wed, Feb 22, 2012 at 1:19 PM, Greg Kroah-Hartman
> > <> wrote:
> > >
> > > Thanks for doing the backport.  Any ideas on how far back this problem
> > > goes?
> >
> > The fundamental bug goes back forever, but happily afaik you can only
> > *trigger* it by doing FPU accesses from interrupts, and nobody did
> > that until the AES-NI instructions came about.
> >
> > So practically speaking it goes back to the introduction of
> > CRYPTO_AES_NI_INTEL, in commit 54b6a1bd5364 ("crypto: aes-ni - Add
> > support to Intel AES-NI instructions for x86_64 platform").
> >
> > Which was merged into 2.6.30. So it still goes back pretty far.
> >
> > The good news is that I *think* the whole i387 handling code hasn't
> > been touched much. But I didn't really check deeply.
> Ok, I'll see how far back I can backport it easily, after Peter verifies
> that this series works for him on his box.

I've applied this now to the 3.0 and 3.2-stable trees. It looks like it
would work on the 2.6.32-stable tree, but it needs some tweaks, and as I
can't really test this, and the .32-stable tree is probably not going to
have problems in this area, I'll let someone else generate those patches
and test them if they feel it is needed there.


greg k-h
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