Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Wed, Feb 21, 2018 at 01:43:34PM +, Ard Biesheuvel wrote:
> On 21 February 2018 at 12:53, Greg KH  wrote:
> > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> >> Hi Greg,
> >>
> >> I've put together a tag which includes all of the upstream arm64 spectre 
> >> and
> >> meltdown mitigations based on v4.15. Please could you consider taking this
> >> into the 4.15 stable tree?
> >>
> >> I understand that Ard (cc'd) is using this stack to create a version for 
> >> 4.14
> >> too.
> >
> > Do you know of anyone working on backporting this patch series to older
> > stable trees (i.e. 4.9.y and 4.4.y and possibly 3.18.y?)
> >
> >
> > I had some requests by some chip manufacturers who were wondering about
> > this, as they seem to be stuck on older kernels (of their own doing, not
> > our fault at all...)
> >
> > If not, no big deal, I'll just tell them they need to do the work
> > themselves if they care about those old kernel trees :)
> >
> 
> I had a stab at applying this series to v4.9 LTS as well as our own
> v4.9 LTS based stable tree (which has backports of lots of arch/arm64
> features applied on top), but there are just too many conflicts.
> Functionally, I don't think there are any real impediments, but the
> interaction with things like PAN emulation and the
> feature/errata/alternatives framework make backporting rather tedious.
> Combined with the fact that the Meltdown threat is rather theoretical
> for most things already deployed, I am not convinced that we are
> likely to end up with something that is more secure than what we
> started with.

Ugh, I was worried about PAN stuff :(

I'm guessing that the android-common trees might have an easier time of
this, I'll go ask the Google developers what they are considering for
these trees.

> In any case, I don't think this series should serve as the basis for a
> backport to v4.9 and earlier, and instead, it should probably focus on
> Spectre mitigation only (which is less intrusive AFAICT).

But we have x86 already working for 4.9.y :)

> We have someone in Linaro who is in charge of our stable kernel trees,
> but he will need help from someone who intimately understands the
> code. My focus was v4.14 primarily because of the significance to my
> team (the enterprise group in Linaro), and I cannot justify spending a
> disproportionate amount of time on kernel versions our members don't
> care about.

Fair enough, it makes sense not to drag this back to older kernels
unless someone really cares about it.  Thanks for the quick response,
I'll push back on the people asking about it to see if they even can
detect the issue on their devices...

thanks,

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Wed, Feb 21, 2018 at 01:43:34PM +, Ard Biesheuvel wrote:
> On 21 February 2018 at 12:53, Greg KH  wrote:
> > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> >> Hi Greg,
> >>
> >> I've put together a tag which includes all of the upstream arm64 spectre 
> >> and
> >> meltdown mitigations based on v4.15. Please could you consider taking this
> >> into the 4.15 stable tree?
> >>
> >> I understand that Ard (cc'd) is using this stack to create a version for 
> >> 4.14
> >> too.
> >
> > Do you know of anyone working on backporting this patch series to older
> > stable trees (i.e. 4.9.y and 4.4.y and possibly 3.18.y?)
> >
> >
> > I had some requests by some chip manufacturers who were wondering about
> > this, as they seem to be stuck on older kernels (of their own doing, not
> > our fault at all...)
> >
> > If not, no big deal, I'll just tell them they need to do the work
> > themselves if they care about those old kernel trees :)
> >
> 
> I had a stab at applying this series to v4.9 LTS as well as our own
> v4.9 LTS based stable tree (which has backports of lots of arch/arm64
> features applied on top), but there are just too many conflicts.
> Functionally, I don't think there are any real impediments, but the
> interaction with things like PAN emulation and the
> feature/errata/alternatives framework make backporting rather tedious.
> Combined with the fact that the Meltdown threat is rather theoretical
> for most things already deployed, I am not convinced that we are
> likely to end up with something that is more secure than what we
> started with.

Ugh, I was worried about PAN stuff :(

I'm guessing that the android-common trees might have an easier time of
this, I'll go ask the Google developers what they are considering for
these trees.

> In any case, I don't think this series should serve as the basis for a
> backport to v4.9 and earlier, and instead, it should probably focus on
> Spectre mitigation only (which is less intrusive AFAICT).

But we have x86 already working for 4.9.y :)

> We have someone in Linaro who is in charge of our stable kernel trees,
> but he will need help from someone who intimately understands the
> code. My focus was v4.14 primarily because of the significance to my
> team (the enterprise group in Linaro), and I cannot justify spending a
> disproportionate amount of time on kernel versions our members don't
> care about.

Fair enough, it makes sense not to drag this back to older kernels
unless someone really cares about it.  Thanks for the quick response,
I'll push back on the people asking about it to see if they even can
detect the issue on their devices...

thanks,

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Ard Biesheuvel]

On 21 February 2018 at 12:53, Greg KH  wrote:
> On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
>> Hi Greg,
>>
>> I've put together a tag which includes all of the upstream arm64 spectre and
>> meltdown mitigations based on v4.15. Please could you consider taking this
>> into the 4.15 stable tree?
>>
>> I understand that Ard (cc'd) is using this stack to create a version for 4.14
>> too.
>
> Do you know of anyone working on backporting this patch series to older
> stable trees (i.e. 4.9.y and 4.4.y and possibly 3.18.y?)
>
>
> I had some requests by some chip manufacturers who were wondering about
> this, as they seem to be stuck on older kernels (of their own doing, not
> our fault at all...)
>
> If not, no big deal, I'll just tell them they need to do the work
> themselves if they care about those old kernel trees :)
>

I had a stab at applying this series to v4.9 LTS as well as our own
v4.9 LTS based stable tree (which has backports of lots of arch/arm64
features applied on top), but there are just too many conflicts.
Functionally, I don't think there are any real impediments, but the
interaction with things like PAN emulation and the
feature/errata/alternatives framework make backporting rather tedious.
Combined with the fact that the Meltdown threat is rather theoretical
for most things already deployed, I am not convinced that we are
likely to end up with something that is more secure than what we
started with.

In any case, I don't think this series should serve as the basis for a
backport to v4.9 and earlier, and instead, it should probably focus on
Spectre mitigation only (which is less intrusive AFAICT). We have
someone in Linaro who is in charge of our stable kernel trees, but he
will need help from someone who intimately understands the code. My
focus was v4.14 primarily because of the significance to my team (the
enterprise group in Linaro), and I cannot justify spending a
disproportionate amount of time on kernel versions our members don't
care about.

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Ard Biesheuvel]

On 21 February 2018 at 12:53, Greg KH  wrote:
> On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
>> Hi Greg,
>>
>> I've put together a tag which includes all of the upstream arm64 spectre and
>> meltdown mitigations based on v4.15. Please could you consider taking this
>> into the 4.15 stable tree?
>>
>> I understand that Ard (cc'd) is using this stack to create a version for 4.14
>> too.
>
> Do you know of anyone working on backporting this patch series to older
> stable trees (i.e. 4.9.y and 4.4.y and possibly 3.18.y?)
>
>
> I had some requests by some chip manufacturers who were wondering about
> this, as they seem to be stuck on older kernels (of their own doing, not
> our fault at all...)
>
> If not, no big deal, I'll just tell them they need to do the work
> themselves if they care about those old kernel trees :)
>

I had a stab at applying this series to v4.9 LTS as well as our own
v4.9 LTS based stable tree (which has backports of lots of arch/arm64
features applied on top), but there are just too many conflicts.
Functionally, I don't think there are any real impediments, but the
interaction with things like PAN emulation and the
feature/errata/alternatives framework make backporting rather tedious.
Combined with the fact that the Meltdown threat is rather theoretical
for most things already deployed, I am not convinced that we are
likely to end up with something that is more secure than what we
started with.

In any case, I don't think this series should serve as the basis for a
backport to v4.9 and earlier, and instead, it should probably focus on
Spectre mitigation only (which is less intrusive AFAICT). We have
someone in Linaro who is in charge of our stable kernel trees, but he
will need help from someone who intimately understands the code. My
focus was v4.14 primarily because of the significance to my team (the
enterprise group in Linaro), and I cannot justify spending a
disproportionate amount of time on kernel versions our members don't
care about.

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> Hi Greg,
> 
> I've put together a tag which includes all of the upstream arm64 spectre and
> meltdown mitigations based on v4.15. Please could you consider taking this
> into the 4.15 stable tree?
> 
> I understand that Ard (cc'd) is using this stack to create a version for 4.14
> too.

Do you know of anyone working on backporting this patch series to older
stable trees (i.e. 4.9.y and 4.4.y and possibly 3.18.y?)


I had some requests by some chip manufacturers who were wondering about
this, as they seem to be stuck on older kernels (of their own doing, not
our fault at all...)

If not, no big deal, I'll just tell them they need to do the work
themselves if they care about those old kernel trees :)

thanks,

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> Hi Greg,
> 
> I've put together a tag which includes all of the upstream arm64 spectre and
> meltdown mitigations based on v4.15. Please could you consider taking this
> into the 4.15 stable tree?
> 
> I understand that Ard (cc'd) is using this stack to create a version for 4.14
> too.

Do you know of anyone working on backporting this patch series to older
stable trees (i.e. 4.9.y and 4.4.y and possibly 3.18.y?)


I had some requests by some chip manufacturers who were wondering about
this, as they seem to be stuck on older kernels (of their own doing, not
our fault at all...)

If not, no big deal, I'll just tell them they need to do the work
themselves if they care about those old kernel trees :)

thanks,

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Wed, Feb 14, 2018 at 01:54:03PM +0100, Greg KH wrote:
> On Wed, Feb 14, 2018 at 12:41:01PM +, Will Deacon wrote:
> > Hey Greg,
> > 
> > On Tue, Feb 13, 2018 at 05:48:59PM +0100, Greg KH wrote:
> > > On Fri, Feb 09, 2018 at 04:04:36PM +0100, Greg KH wrote:
> > > > On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> > > > > On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > > > > > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > > > > > Hi Greg,
> > > > > > > 
> > > > > > > I've put together a tag which includes all of the upstream arm64 
> > > > > > > spectre and
> > > > > > > meltdown mitigations based on v4.15. Please could you consider 
> > > > > > > taking this
> > > > > > > into the 4.15 stable tree?
> > > > > > > 
> > > > > > > I understand that Ard (cc'd) is using this stack to create a 
> > > > > > > version for 4.14
> > > > > > > too.
> > > > > > > 
> > > > > > > Note that there are two commits in here that are already in 
> > > > > > > stable:
> > > > > > > 
> > > > > > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > > > > > array_index_nospec
> > > > > > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: 
> > > > > > > Sanitize speculative array de-references
> > > > > > > 
> > > > > > > so you can skip those when applying.
> > > > > > > 
> > > > > > > Please shout if you run into trouble.
> > > > > > 
> > > > > > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > > > > > release after the one I _just_ sent out for review a few minutes 
> > > > > > ago.
> > > > > 
> > > > > Cool, sorry for the unfortunate timing. This only hit mainline last 
> > > > > night.
> > > > 
> > > > Ok, then it's not a big deal to wait a few more days :)
> > > 
> > > All now queued up, thanks!
> > 
> > Good to hear, thanks! Could you also queue the 4.14 backport [1], please?
> > Having this in an LTS would be really handy.
> 
> Yes, please give me a chance, I have 240+ pending stable patches at the
> moment to dig through :)

Ok, now queued up, but there were some conflicts, so checking I got it
all correct would be wonderful.

thanks,

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Wed, Feb 14, 2018 at 01:54:03PM +0100, Greg KH wrote:
> On Wed, Feb 14, 2018 at 12:41:01PM +, Will Deacon wrote:
> > Hey Greg,
> > 
> > On Tue, Feb 13, 2018 at 05:48:59PM +0100, Greg KH wrote:
> > > On Fri, Feb 09, 2018 at 04:04:36PM +0100, Greg KH wrote:
> > > > On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> > > > > On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > > > > > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > > > > > Hi Greg,
> > > > > > > 
> > > > > > > I've put together a tag which includes all of the upstream arm64 
> > > > > > > spectre and
> > > > > > > meltdown mitigations based on v4.15. Please could you consider 
> > > > > > > taking this
> > > > > > > into the 4.15 stable tree?
> > > > > > > 
> > > > > > > I understand that Ard (cc'd) is using this stack to create a 
> > > > > > > version for 4.14
> > > > > > > too.
> > > > > > > 
> > > > > > > Note that there are two commits in here that are already in 
> > > > > > > stable:
> > > > > > > 
> > > > > > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > > > > > array_index_nospec
> > > > > > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: 
> > > > > > > Sanitize speculative array de-references
> > > > > > > 
> > > > > > > so you can skip those when applying.
> > > > > > > 
> > > > > > > Please shout if you run into trouble.
> > > > > > 
> > > > > > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > > > > > release after the one I _just_ sent out for review a few minutes 
> > > > > > ago.
> > > > > 
> > > > > Cool, sorry for the unfortunate timing. This only hit mainline last 
> > > > > night.
> > > > 
> > > > Ok, then it's not a big deal to wait a few more days :)
> > > 
> > > All now queued up, thanks!
> > 
> > Good to hear, thanks! Could you also queue the 4.14 backport [1], please?
> > Having this in an LTS would be really handy.
> 
> Yes, please give me a chance, I have 240+ pending stable patches at the
> moment to dig through :)

Ok, now queued up, but there were some conflicts, so checking I got it
all correct would be wonderful.

thanks,

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Wed, Feb 14, 2018 at 12:41:01PM +, Will Deacon wrote:
> Hey Greg,
> 
> On Tue, Feb 13, 2018 at 05:48:59PM +0100, Greg KH wrote:
> > On Fri, Feb 09, 2018 at 04:04:36PM +0100, Greg KH wrote:
> > > On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> > > > On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > > > > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > > > > Hi Greg,
> > > > > > 
> > > > > > I've put together a tag which includes all of the upstream arm64 
> > > > > > spectre and
> > > > > > meltdown mitigations based on v4.15. Please could you consider 
> > > > > > taking this
> > > > > > into the 4.15 stable tree?
> > > > > > 
> > > > > > I understand that Ard (cc'd) is using this stack to create a 
> > > > > > version for 4.14
> > > > > > too.
> > > > > > 
> > > > > > Note that there are two commits in here that are already in stable:
> > > > > > 
> > > > > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > > > > array_index_nospec
> > > > > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > > > > > speculative array de-references
> > > > > > 
> > > > > > so you can skip those when applying.
> > > > > > 
> > > > > > Please shout if you run into trouble.
> > > > > 
> > > > > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > > > > release after the one I _just_ sent out for review a few minutes ago.
> > > > 
> > > > Cool, sorry for the unfortunate timing. This only hit mainline last 
> > > > night.
> > > 
> > > Ok, then it's not a big deal to wait a few more days :)
> > 
> > All now queued up, thanks!
> 
> Good to hear, thanks! Could you also queue the 4.14 backport [1], please?
> Having this in an LTS would be really handy.

Yes, please give me a chance, I have 240+ pending stable patches at the
moment to dig through :)

thanks,

greg kh

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Wed, Feb 14, 2018 at 12:41:01PM +, Will Deacon wrote:
> Hey Greg,
> 
> On Tue, Feb 13, 2018 at 05:48:59PM +0100, Greg KH wrote:
> > On Fri, Feb 09, 2018 at 04:04:36PM +0100, Greg KH wrote:
> > > On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> > > > On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > > > > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > > > > Hi Greg,
> > > > > > 
> > > > > > I've put together a tag which includes all of the upstream arm64 
> > > > > > spectre and
> > > > > > meltdown mitigations based on v4.15. Please could you consider 
> > > > > > taking this
> > > > > > into the 4.15 stable tree?
> > > > > > 
> > > > > > I understand that Ard (cc'd) is using this stack to create a 
> > > > > > version for 4.14
> > > > > > too.
> > > > > > 
> > > > > > Note that there are two commits in here that are already in stable:
> > > > > > 
> > > > > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > > > > array_index_nospec
> > > > > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > > > > > speculative array de-references
> > > > > > 
> > > > > > so you can skip those when applying.
> > > > > > 
> > > > > > Please shout if you run into trouble.
> > > > > 
> > > > > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > > > > release after the one I _just_ sent out for review a few minutes ago.
> > > > 
> > > > Cool, sorry for the unfortunate timing. This only hit mainline last 
> > > > night.
> > > 
> > > Ok, then it's not a big deal to wait a few more days :)
> > 
> > All now queued up, thanks!
> 
> Good to hear, thanks! Could you also queue the 4.14 backport [1], please?
> Having this in an LTS would be really handy.

Yes, please give me a chance, I have 240+ pending stable patches at the
moment to dig through :)

thanks,

greg kh

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Will Deacon]

Hey Greg,

On Tue, Feb 13, 2018 at 05:48:59PM +0100, Greg KH wrote:
> On Fri, Feb 09, 2018 at 04:04:36PM +0100, Greg KH wrote:
> > On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> > > On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > > > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > > > Hi Greg,
> > > > > 
> > > > > I've put together a tag which includes all of the upstream arm64 
> > > > > spectre and
> > > > > meltdown mitigations based on v4.15. Please could you consider taking 
> > > > > this
> > > > > into the 4.15 stable tree?
> > > > > 
> > > > > I understand that Ard (cc'd) is using this stack to create a version 
> > > > > for 4.14
> > > > > too.
> > > > > 
> > > > > Note that there are two commits in here that are already in stable:
> > > > > 
> > > > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > > > array_index_nospec
> > > > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > > > > speculative array de-references
> > > > > 
> > > > > so you can skip those when applying.
> > > > > 
> > > > > Please shout if you run into trouble.
> > > > 
> > > > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > > > release after the one I _just_ sent out for review a few minutes ago.
> > > 
> > > Cool, sorry for the unfortunate timing. This only hit mainline last night.
> > 
> > Ok, then it's not a big deal to wait a few more days :)
> 
> All now queued up, thanks!

Good to hear, thanks! Could you also queue the 4.14 backport [1], please?
Having this in an LTS would be really handy.

Cheers,

Will

[1] http://lkml.kernel.org/r/20180212113801.2552-1-ard.biesheu...@linaro.org

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Will Deacon]

Hey Greg,

On Tue, Feb 13, 2018 at 05:48:59PM +0100, Greg KH wrote:
> On Fri, Feb 09, 2018 at 04:04:36PM +0100, Greg KH wrote:
> > On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> > > On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > > > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > > > Hi Greg,
> > > > > 
> > > > > I've put together a tag which includes all of the upstream arm64 
> > > > > spectre and
> > > > > meltdown mitigations based on v4.15. Please could you consider taking 
> > > > > this
> > > > > into the 4.15 stable tree?
> > > > > 
> > > > > I understand that Ard (cc'd) is using this stack to create a version 
> > > > > for 4.14
> > > > > too.
> > > > > 
> > > > > Note that there are two commits in here that are already in stable:
> > > > > 
> > > > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > > > array_index_nospec
> > > > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > > > > speculative array de-references
> > > > > 
> > > > > so you can skip those when applying.
> > > > > 
> > > > > Please shout if you run into trouble.
> > > > 
> > > > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > > > release after the one I _just_ sent out for review a few minutes ago.
> > > 
> > > Cool, sorry for the unfortunate timing. This only hit mainline last night.
> > 
> > Ok, then it's not a big deal to wait a few more days :)
> 
> All now queued up, thanks!

Good to hear, thanks! Could you also queue the 4.14 backport [1], please?
Having this in an LTS would be really handy.

Cheers,

Will

[1] http://lkml.kernel.org/r/20180212113801.2552-1-ard.biesheu...@linaro.org

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Fri, Feb 09, 2018 at 04:04:36PM +0100, Greg KH wrote:
> On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> > On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > > Hi Greg,
> > > > 
> > > > I've put together a tag which includes all of the upstream arm64 
> > > > spectre and
> > > > meltdown mitigations based on v4.15. Please could you consider taking 
> > > > this
> > > > into the 4.15 stable tree?
> > > > 
> > > > I understand that Ard (cc'd) is using this stack to create a version 
> > > > for 4.14
> > > > too.
> > > > 
> > > > Note that there are two commits in here that are already in stable:
> > > > 
> > > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > > array_index_nospec
> > > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > > > speculative array de-references
> > > > 
> > > > so you can skip those when applying.
> > > > 
> > > > Please shout if you run into trouble.
> > > 
> > > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > > release after the one I _just_ sent out for review a few minutes ago.
> > 
> > Cool, sorry for the unfortunate timing. This only hit mainline last night.
> 
> Ok, then it's not a big deal to wait a few more days :)

All now queued up, thanks!

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Fri, Feb 09, 2018 at 04:04:36PM +0100, Greg KH wrote:
> On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> > On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > > Hi Greg,
> > > > 
> > > > I've put together a tag which includes all of the upstream arm64 
> > > > spectre and
> > > > meltdown mitigations based on v4.15. Please could you consider taking 
> > > > this
> > > > into the 4.15 stable tree?
> > > > 
> > > > I understand that Ard (cc'd) is using this stack to create a version 
> > > > for 4.14
> > > > too.
> > > > 
> > > > Note that there are two commits in here that are already in stable:
> > > > 
> > > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > > array_index_nospec
> > > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > > > speculative array de-references
> > > > 
> > > > so you can skip those when applying.
> > > > 
> > > > Please shout if you run into trouble.
> > > 
> > > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > > release after the one I _just_ sent out for review a few minutes ago.
> > 
> > Cool, sorry for the unfortunate timing. This only hit mainline last night.
> 
> Ok, then it's not a big deal to wait a few more days :)

All now queued up, thanks!

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > Hi Greg,
> > > 
> > > I've put together a tag which includes all of the upstream arm64 spectre 
> > > and
> > > meltdown mitigations based on v4.15. Please could you consider taking this
> > > into the 4.15 stable tree?
> > > 
> > > I understand that Ard (cc'd) is using this stack to create a version for 
> > > 4.14
> > > too.
> > > 
> > > Note that there are two commits in here that are already in stable:
> > > 
> > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > array_index_nospec
> > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > > speculative array de-references
> > > 
> > > so you can skip those when applying.
> > > 
> > > Please shout if you run into trouble.
> > 
> > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > release after the one I _just_ sent out for review a few minutes ago.
> 
> Cool, sorry for the unfortunate timing. This only hit mainline last night.

Ok, then it's not a big deal to wait a few more days :)

Maybe by then we can have the 4.14 patches at the same time...

thanks,

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Fri, Feb 09, 2018 at 01:51:31PM +, Will Deacon wrote:
> On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> > On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > > Hi Greg,
> > > 
> > > I've put together a tag which includes all of the upstream arm64 spectre 
> > > and
> > > meltdown mitigations based on v4.15. Please could you consider taking this
> > > into the 4.15 stable tree?
> > > 
> > > I understand that Ard (cc'd) is using this stack to create a version for 
> > > 4.14
> > > too.
> > > 
> > > Note that there are two commits in here that are already in stable:
> > > 
> > >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > > array_index_nospec
> > >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > > speculative array de-references
> > > 
> > > so you can skip those when applying.
> > > 
> > > Please shout if you run into trouble.
> > 
> > Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> > release after the one I _just_ sent out for review a few minutes ago.
> 
> Cool, sorry for the unfortunate timing. This only hit mainline last night.

Ok, then it's not a big deal to wait a few more days :)

Maybe by then we can have the 4.14 patches at the same time...

thanks,

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Will Deacon]

On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > Hi Greg,
> > 
> > I've put together a tag which includes all of the upstream arm64 spectre and
> > meltdown mitigations based on v4.15. Please could you consider taking this
> > into the 4.15 stable tree?
> > 
> > I understand that Ard (cc'd) is using this stack to create a version for 
> > 4.14
> > too.
> > 
> > Note that there are two commits in here that are already in stable:
> > 
> >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > array_index_nospec
> >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > speculative array de-references
> > 
> > so you can skip those when applying.
> > 
> > Please shout if you run into trouble.
> 
> Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> release after the one I _just_ sent out for review a few minutes ago.

Cool, sorry for the unfortunate timing. This only hit mainline last night.

Will

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Will Deacon]

On Fri, Feb 09, 2018 at 02:49:57PM +0100, Greg KH wrote:
> On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> > Hi Greg,
> > 
> > I've put together a tag which includes all of the upstream arm64 spectre and
> > meltdown mitigations based on v4.15. Please could you consider taking this
> > into the 4.15 stable tree?
> > 
> > I understand that Ard (cc'd) is using this stack to create a version for 
> > 4.14
> > too.
> > 
> > Note that there are two commits in here that are already in stable:
> > 
> >   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> > array_index_nospec
> >   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> > speculative array de-references
> > 
> > so you can skip those when applying.
> > 
> > Please shout if you run into trouble.
> 
> Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
> release after the one I _just_ sent out for review a few minutes ago.

Cool, sorry for the unfortunate timing. This only hit mainline last night.

Will

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> Hi Greg,
> 
> I've put together a tag which includes all of the upstream arm64 spectre and
> meltdown mitigations based on v4.15. Please could you consider taking this
> into the 4.15 stable tree?
> 
> I understand that Ard (cc'd) is using this stack to create a version for 4.14
> too.
> 
> Note that there are two commits in here that are already in stable:
> 
>   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> array_index_nospec
>   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> speculative array de-references
> 
> so you can skip those when applying.
> 
> Please shout if you run into trouble.

Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
release after the one I _just_ sent out for review a few minutes ago.

greg k-h

Re: [GIT PULL] arm64 spectre and meltdown mitigations for -stable

[Greg KH]

On Fri, Feb 09, 2018 at 01:48:11PM +, Will Deacon wrote:
> Hi Greg,
> 
> I've put together a tag which includes all of the upstream arm64 spectre and
> meltdown mitigations based on v4.15. Please could you consider taking this
> into the 4.15 stable tree?
> 
> I understand that Ard (cc'd) is using this stack to create a version for 4.14
> too.
> 
> Note that there are two commits in here that are already in stable:
> 
>   9c9345fb26ff [Variant 1/Spectre-v1] Documentation: Document 
> array_index_nospec
>   60d6c8a8e54e [Variant 1/Spectre-v1] array_index_nospec: Sanitize 
> speculative array de-references
> 
> so you can skip those when applying.
> 
> Please shout if you run into trouble.

Ah, nice, thanks for this.  I'll use this for the next 4.15.y kernel
release after the one I _just_ sent out for review a few minutes ago.

greg k-h