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Wed, 05 Feb 2025 15:04:28 -0800 (PST) MIME-Version: 1.0 References: <8bd9c793-aac6-a330-ea8f-3bde0230a20b@gentwo.org> <3dcf7631-d839-7235-10c7-30f80d7f796a@gentwo.org> In-Reply-To: <3dcf7631-d839-7235-10c7-30f80d7f796a@gentwo.org> From: Ard Biesheuvel Date: Thu, 6 Feb 2025 00:04:17 +0100 X-Gmail-Original-Message-ID: X-Gm-Features: AWEUYZnX90yX3IKaA52q5S_M7G8eGfUWUp3XkEiKOjpcZPLHNrjrrMHxTq0wSUs Message-ID: Subject: Re: [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86 To: "Christoph Lameter (Ampere)" Cc: Dave Hansen , Maciej Wieczor-Retman , luto@kernel.org, xin@zytor.com, kirill.shutemov@linux.intel.com, palmer@dabbelt.com, tj@kernel.org, andreyknvl@gmail.com, brgerst@gmail.com, dave.hansen@linux.intel.com, jgross@suse.com, will@kernel.org, akpm@linux-foundation.org, arnd@arndb.de, corbet@lwn.net, dvyukov@google.com, richard.weiyang@gmail.com, ytcoode@gmail.com, tglx@linutronix.de, hpa@zytor.com, seanjc@google.com, paul.walmsley@sifive.com, aou@eecs.berkeley.edu, justinstitt@google.com, jason.andryuk@amd.com, glider@google.com, ubizjak@gmail.com, jannh@google.com, bhe@redhat.com, vincenzo.frascino@arm.com, rafael.j.wysocki@intel.com, ndesaulniers@google.com, mingo@redhat.com, catalin.marinas@arm.com, junichi.nomura@nec.com, nathan@kernel.org, ryabinin.a.a@gmail.com, dennis@kernel.org, bp@alien8.de, kevinloughlin@google.com, morbo@google.com, dan.j.williams@intel.com, julian.stecklina@cyberus-technology.de, peterz@infradead.org, kees@kernel.org, kasan-dev@googlegroups.com, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, linux-doc@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: ak1sfx6s49dnhgcx5j1gr9cicsh97z5u X-Rspam-User: X-Rspamd-Queue-Id: CCD33C000E X-Rspamd-Server: rspam03 X-HE-Tag: 1738796671-841332 X-HE-Meta: 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 qt1Fnrvh Ux9UckUQc9O6Dz758vfX3tk3rHdY5UPSdI0hbRfMqGS9OPtywh9w3qArlXvrZ6+W6RDzRBdKsQtnDx2MFPoStWsNdYaA7bncN/gMgM3lplr59Bj6vwz7xkJ0sTacMKn+f3kNX1oMogTezMnXCd/3O/aDFepWi8tLwcZH+Vk8/DmaMz5K5tSsdLOSlpbmlTebad2VGQoeU7TAFLrrt41stwXXpmDgISiqkuRtFb3Zp0dq5IqSVcyc7q+YqB7TBehOVFbsdST5aMpm8AsCAyHJPDaTPj580E8ohBlO3whc1hl4WH2XM81LWuGCt+Nc5aOAfKgrWpJa1fuOGGpI0NW+E4wemH1p+TgSSZ7VCr1g3MF0SoPNp8Hm4gB8aceOXE5XrLlCOIM4CepG/R5Lo7Cfrr2d7VcoiYauzwf3jpZ5s4MhDF41lVNiEht3kWA== 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: On Wed, 5 Feb 2025 at 20:31, Christoph Lameter (Ampere) wrote: > > MTE tagging is part of the processor standard for ARM64 and Linux will > need to support the 16 byte tagging feature one way or another even if > Intel does not like it. And AFAICT hardware tagging support is a critical > security feature for the future. > Can you explain what you feel is lacking in the existing MTE support in KAsan (enabled when selecting CONFIG_KASAN_HW_TAGS)?