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Date: Tue, 22 Aug 2023 17:40:38 +0100
From: Catalin Marinas <catalin.marinas@arm.com>
To: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	Marc Zyngier <maz@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
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	Eric Biederman <ebiederm@xmission.com>,
	Kees Cook <keescook@chromium.org>, Shuah Khan <shuah@kernel.org>,
	"Rick P. Edgecombe" <rick.p.edgecombe@intel.com>,
	Deepak Gupta <debug@rivosinc.com>, Ard Biesheuvel <ardb@kernel.org>,
	Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
	"H.J. Lu" <hjl.tools@gmail.com>,
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Subject: Re: [PATCH v4 21/36] arm64/mm: Implement map_shadow_stack()
Message-ID: <ZOTlBpAbSX6TSZzW@arm.com>
References: <20230807-arm64-gcs-v4-0-68cfa37f9069@kernel.org>
 <20230807-arm64-gcs-v4-21-68cfa37f9069@kernel.org>
 <ZNZkADhSnodXuH5F@arm.com>
 <9c722954-8f30-425e-a0a4-6edad463620f@sirena.org.uk>
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In-Reply-To: <9c722954-8f30-425e-a0a4-6edad463620f@sirena.org.uk>

On Fri, Aug 18, 2023 at 06:08:52PM +0100, Mark Brown wrote:
> On Fri, Aug 11, 2023 at 05:38:24PM +0100, Catalin Marinas wrote:
> 
> > Given that we won't have an mmap(PROT_SHADOW_STACK), are we going to
> > have restrictions on mprotect()? E.g. it would be useful to reject a
> > PROT_EXEC on the shadow stack.
> 
> mprotect() uses arch_validate_flags() which we're already having cover
> this so it's already covered.

I searched the patches and there's no change to the arm64
arch_validate_flags(). Maybe I missed it.

-- 
Catalin