2018-02-08 9:57 GMT+09:00 Kees Cook :
> On Thu, Feb 8, 2018 at 10:44 AM, Masahiro Yamada
> wrote:
>> 2018-02-08 2:55 GMT+09:00 Linus Torvalds :
>>> What I would really want - and this is entirely unrelated to this
>>> particular case - is to have those damn compiler option tests as part
>>> of the
On Thu, Feb 8, 2018 at 10:44 AM, Masahiro Yamada
wrote:
> 2018-02-08 2:55 GMT+09:00 Linus Torvalds :
>> What I would really want - and this is entirely unrelated to this
>> particular case - is to have those damn compiler option tests as part
>> of the config phase in general. We now have about a
On Wed, Feb 7, 2018 at 3:44 PM, Masahiro Yamada
wrote:
>
> I agreed this before, and still motivated.
> (because I also motivated to remove kbuild cache.
I actually wish I still had my old "run shell script" thing. I had
some very preliminary patches that actually worked for simple things,
and yo
2018-02-08 2:55 GMT+09:00 Linus Torvalds :
> On Wed, Feb 7, 2018 at 4:17 AM, Martin Schwidefsky
> wrote:
>>> That isn't, though. Linus asked us to drop the $(warning) part.
>>>
>>> ... and then spent a week building with a non-retpoline compiler and
>>> not noticing, so he might have changed his m
On Wed, Feb 7, 2018 at 4:17 AM, Martin Schwidefsky
wrote:
>> That isn't, though. Linus asked us to drop the $(warning) part.
>>
>> ... and then spent a week building with a non-retpoline compiler and
>> not noticing, so he might have changed his mind ;)
>
> I found the warning to have some value,
On Wed, 2018-02-07 at 13:17 +0100, Martin Schwidefsky wrote:
> On Wed, 07 Feb 2018 12:07:55 +
> David Woodhouse wrote:
>
> >
> > On Wed, 2018-02-07 at 11:07 +0100, Pavel Machek wrote:
> > >
> > > This is really unfortunate naming of kernel option.
> > >
> > > spectre_v2=off sounds like w
On Wed, 07 Feb 2018 12:07:55 +
David Woodhouse wrote:
> On Wed, 2018-02-07 at 11:07 +0100, Pavel Machek wrote:
> > This is really unfortunate naming of kernel option.
> >
> > spectre_v2=off sounds like we are turning the "bug" off, but i somehow
> > suspect you are turning the bug _workaroun
On Wed, 2018-02-07 at 11:07 +0100, Pavel Machek wrote:
> This is really unfortunate naming of kernel option.
>
> spectre_v2=off sounds like we are turning the "bug" off, but i somehow
> suspect you are turning the bug _workaround_ off.
That's consistent with what we have on x86.
> > +ifdef CON
On Wed, 7 Feb 2018 11:07:26 +0100
Pavel Machek wrote:
> On Wed 2018-02-07 08:00:11, Martin Schwidefsky wrote:
> > Add CONFIG_EXPOLINE to enable the use of the new -mindirect-branch= and
> > -mfunction_return= compiler options to create a kernel fortified against
> > the specte v2 attack.
> >
> >
On Wed 2018-02-07 08:00:11, Martin Schwidefsky wrote:
> Add CONFIG_EXPOLINE to enable the use of the new -mindirect-branch= and
> -mfunction_return= compiler options to create a kernel fortified against
> the specte v2 attack.
>
> With CONFIG_EXPOLINE=y all indirect branches will be issued with an
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