linux-kernel - Re: [PATCH RESEND 1/2] prctl: Generalize PR_SET

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Message-ID: <Zd24aCps4xD28c74@shell.armlinux.org.uk>
Date: Tue, 27 Feb 2024 10:24:40 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Zev Weiss <zev@...ilderbeest.net>
Cc: linux-parisc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Helge Deller <deller@....de>, Florent Revest <revest@...omium.org>,
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	"Borislav Petkov (AMD)" <bp@...en8.de>,
	Yin Fengwei <fengwei.yin@...el.com>,
	"Mike Rapoport (IBM)" <rppt@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Yang Shi <yang@...amperecomputing.com>,
	Rick Edgecombe <rick.p.edgecombe@...el.com>,
	Oleg Nesterov <oleg@...hat.com>,
	David Hildenbrand <david@...hat.com>,
	Stefan Roesch <shr@...kernel.io>,
	Josh Triplett <josh@...htriplett.org>,
	Ondrej Mosnacek <omosnace@...hat.com>,
	Miguel Ojeda <ojeda@...nel.org>, linux-kernel@...r.kernel.org,
	openbmc@...ts.ozlabs.org, Sam James <sam@...too.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH RESEND 1/2] prctl: Generalize PR_SET_MDWE support check
 to be per-arch

On Mon, Feb 26, 2024 at 05:35:41PM -0800, Zev Weiss wrote:
> There exist systems other than PARISC where MDWE may not be feasible
> to support; rather than cluttering up the generic code with additional
> arch-specific logic let's add a generic function for checking MDWE
> support and allow each arch to override it as needed.
> 
> Signed-off-by: Zev Weiss <zev@...ilderbeest.net>
> Cc: <stable@...r.kernel.org> # v6.3+

PA-RISC folk need to ack/review-by this patch. Alternatively, it needs
to be restructured to add the arch_memory_deny_write_exec_supported()
override without touching the PA-RISC code, which then makes the Arm
patch independent of the status of the PA-RISC patch. That will allow
the Arm issue to be solved even if an ack is not forthcoming for the
PA-RISC parts.

Alternatively, I wonder whether akpm would be willing to pick up this
patch set as-is.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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