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b=psefFyFwcCSMM704n/PghElOSiJNvILlJNI0F9AWzTMwXrebRp5JcacIDypratT/1 0v73e8fN2mho163LqjEJtpaHXOuGAR1msR4cfx917H+frORBPL41NHpr7hKJ52tLV7 DDOLTfoES26QUqTBCR6Mi7zHCAZM1FdO91OOgnmLXfhnmLymP+AKnXqRXuJisb/8Hn CaiF+u1pKyKBUNTe8jpwL11FVRnO6ahy5qNXExYGGIF7OEKCfLzQ+wkytqH2lktzeM Fx7GWcm+n0dGpb7ocTZSESpLstlhljmUetVxXd/Y7BbrABrVO2e8I9L4aakKxQ2CHg 1Xn27J8A2inAw== Date: Thu, 15 Aug 2024 16:26:38 +0100 From: Mark Brown To: "Edgecombe, Rick P" Cc: "corbet@lwn.net" , "ardb@kernel.org" , "maz@kernel.org" , "shuah@kernel.org" , "Szabolcs.Nagy@arm.com" , "james.morse@arm.com" , "debug@rivosinc.com" , "akpm@linux-foundation.org" , "catalin.marinas@arm.com" , "oleg@redhat.com" , "arnd@arndb.de" , "ebiederm@xmission.com" , "will@kernel.org" , "suzuki.poulose@arm.com" , "kees@kernel.org" , "oliver.upton@linux.dev" , "brauner@kernel.org" , "ross.burton@arm.com" , "fweimer@redhat.com" , "aou@eecs.berkeley.edu" , "linux-kernel@vger.kernel.org" , "paul.walmsley@sifive.com" , "hjl.tools@gmail.com" , "linux-mm@kvack.org" , "palmer@dabbelt.com" , "kvmarm@lists.linux.dev" , "linux-arch@vger.kernel.org" , "thiago.bauermann@linaro.org" , "linux-doc@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-fsdevel@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , "linux-riscv@lists.infradead.org" Subject: Re: [PATCH v10 12/40] mm: Define VM_SHADOW_STACK for arm64 when we support GCS Message-ID: <3a7d9b69-e9df-4271-a3f0-8e8683c2654f@sirena.org.uk> References: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> <20240801-arm64-gcs-v10-12-699e2bd2190b@kernel.org> <34f7a5378447b1a8d5a9561594b37cfeaa6bd2b1.camel@intel.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="MksM19X6NXlfICdi" Content-Disposition: inline In-Reply-To: <34f7a5378447b1a8d5a9561594b37cfeaa6bd2b1.camel@intel.com> X-Cookie: -- Owen Meredith X-Rspamd-Queue-Id: 29CBD100030 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: hfc6q3y8o8yz3knr9whihrxxikgkyuka X-HE-Tag: 1723735608-730310 X-HE-Meta: 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 fuW+38ZA 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --MksM19X6NXlfICdi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Aug 15, 2024 at 03:20:52PM +0000, Edgecombe, Rick P wrote: > On Thu, 2024-08-01 at 13:06 +0100, Mark Brown wrote: > > Use VM_HIGH_ARCH_5 for guarded control stack pages. > FYI - If you want to have more complete guard gaps, you need to do this for arm > too: > https://lore.kernel.org/linux-mm/20240326021656.202649-14-rick.p.edgecombe@intel.com/ > Using VM_SHADOW_STACK only gets you part of the way there. Oh, thanks for the heads up - I'd missed that. --MksM19X6NXlfICdi Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAma+Hi4ACgkQJNaLcl1U h9Doewf/XswNKQ3VlzKzKEKNyYD5iFma82uwYhlhHv9Nqsb6eiF4zUSOOgbna6xT Cq8p3DS/Im1Fgx/SaMcGP6tNihKE5DGkEufWy+6GIiS5SsrxhPlnzDtY0F4cJ4a5 AELeMm6OD9wZFwcAwnuUJraMRY6olKHlI+cfrFcncvwLNwLkaVE0JlcB1dOxMNSR OqvnO/G0VM25OdY7SV+tJKRi/U5eIa+chRhV0i+qaQOu8oRJfEo6BqkFxz+ZHF19 Dwr/HiGZa663RJVxgdp7mhrotkqK/nCoNksP+gjuEt6z2TIFNdcxPg0BK6mfgN+0 qAKWzvjayIQ9j400dGkkiwuj5/+SNw== =TSgi -----END PGP SIGNATURE----- --MksM19X6NXlfICdi--