Re: [PATCH 0/5] i387: stable kernel backport

Linus Torvalds
2012-02-22T21:29:34Z

On Wed, Feb 22, 2012 at 1:19 PM, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> 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.

Linus