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Message-ID: <60eeefc9-96db-4d4a-b0e4-751cba540471@sirena.org.uk>
Date: Wed, 16 Aug 2023 19:26:12 +0100
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
Andrew Morton <akpm@...ux-foundation.org>,
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Kees Cook <keescook@...omium.org>,
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"Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
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Subject: Re: [PATCH v4 07/36] arm64/gcs: Provide copy_to_user_gcs()
On Fri, Aug 11, 2023 at 05:36:05PM +0100, Catalin Marinas wrote:
> On Mon, Aug 07, 2023 at 11:00:12PM +0100, Mark Brown wrote:
> > +static inline int copy_to_user_gcs(unsigned long __user *addr,
> > + unsigned long *val,
> > + int count)
> I think it makes more sense to have a put_user_gcs() of a single
> element. I've only seen it used with 2 elements in the signal code but
> we could as well do two put_user_gcs() calls (as we do for other stuff
> that we push to the signal frame).
Right, it's just the two element array in the signals code and the one
element for the context token in map_shadow_stack(). I can refactor to
a single read/write operation, I'd originally written it that way but I
wasn't thrilled with either writing a load of fun macros to mirror the
way vanilla put_user() is written or having code that looked very
different to the other similarly named functions were done.
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