On Fri, Aug 09, 2019 at 10:00:17AM +0100, Catalin Marinas wrote:

On Thu, Aug 08, 2019 at 04:09:04PM -0700, Kees Cook wrote:

quoted

On Thu, Aug 08, 2019 at 03:33:00PM -0700, Andrew Morton wrote:

quoted

On Thu, 8 Aug 2019 14:12:19 -0700 Kees Cook [off-list ref] wrote:

quoted

quoted

The ones that are left are the mm ones: 4, 5, 6, 7 and 8.

Andrew, could you take a look and give your Acked-by or pick them up directly?

Given the subsystem Acks, it seems like 3-10 and 12 could all just go
via Andrew? I hope he agrees. :)

I'll grab everything that has not yet appeared in linux-next.  If more
of these patches appear in linux-next I'll drop those as well.

The review discussion against " [PATCH v19 02/15] arm64: Introduce
prctl() options to control the tagged user addresses ABI" has petered
out inconclusively.  prctl() vs arch_prctl().

I've always disliked arch_prctl() existing at all. Given that tagging is
likely to be a multi-architectural feature, it seems like the controls
should live in prctl() to me.

It took a bit of grep'ing to figure out what Dave H meant by
arch_prctl(). It's an x86-specific syscall which we do not have on arm64
(and possibly any other architecture). Actually, we don't have any arm64
specific syscalls, only the generic unistd.h, hence the confusion. For
other arm64-specific prctls like SVE we used the generic sys_prctl() and
I can see x86 not being consistent either (PR_MPX_ENABLE_MANAGEMENT).

In general I disagree with adding any arm64-specific syscalls but in
this instance it can't even be justified. I'd rather see some clean-up
similar to arch_ptrace/ptrace_request than introducing new syscall
numbers (but as I suggested in my reply to Dave, that's for another
patch series).

I had a go at refactoring this a while ago, but it fell by the wayside.

I can try to resurrect it if it's still considered worthwhile.

Cheers
---Dave

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