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b=fcrLqdsduaGm44osSwSPN2OmTnmHZDSQTFb+vK0TurhdOmTd+b6joebWJi7ugwjuM WAHPqx2kg9/40sYmNYjfjQbCWB9501/dcWnfmb2MvGsFNmueEUtnhrPsolxdg7YyDE oZydjAYwQP6P01xZ9qoo4MmQ4flizTLO+ilJD9LM= Date: Mon, 12 Jan 2026 12:53:48 -0800 From: Andrew Morton To: Maciej =?ISO-8859-1?Q?Wiecz=F3r-Retman?= Cc: corbet@lwn.net, morbo@google.com, rppt@kernel.org, lorenzo.stoakes@oracle.com, ubizjak@gmail.com, mingo@redhat.com, vincenzo.frascino@arm.com, maciej.wieczor-retman@intel.com, maz@kernel.org, catalin.marinas@arm.com, yeoreum.yun@arm.com, will@kernel.org, jackmanb@google.com, samuel.holland@sifive.com, glider@google.com, osandov@fb.com, nsc@kernel.org, luto@kernel.org, jpoimboe@kernel.org, Liam.Howlett@oracle.com, kees@kernel.org, jan.kiszka@siemens.com, thomas.lendacky@amd.com, jeremy.linton@arm.com, dvyukov@google.com, axelrasmussen@google.com, leitao@debian.org, ryabinin.a.a@gmail.com, bigeasy@linutronix.de, peterz@infradead.org, mark.rutland@arm.com, urezki@gmail.com, brgerst@gmail.com, hpa@zytor.com, mhocko@suse.com, andreyknvl@gmail.com, weixugc@google.com, kbingham@kernel.org, vbabka@suse.cz, nathan@kernel.org, trintaeoitogc@gmail.com, samitolvanen@google.com, tglx@kernel.org, thuth@redhat.com, surenb@google.com, anshuman.khandual@arm.com, smostafa@google.com, yuanchu@google.com, ada.coupriediaz@arm.com, dave.hansen@linux.intel.com, kas@kernel.org, nick.desaulniers+lkml@gmail.com, david@kernel.org, bp@alien8.de, ardb@kernel.org, justinstitt@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kasan-dev@googlegroups.com, llvm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v8 00/14] kasan: x86: arm64: KASAN tag-based mode for x86 Message-Id: <20260112125348.124d201ef2baf762561a43af@linux-foundation.org> In-Reply-To: References: <20260112102957.359c8de904b11dc23cffd575@linux-foundation.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 48602C0002 X-Stat-Signature: uqob8jitsns9ae4om7w76j5gii589pgu X-Rspam-User: X-HE-Tag: 1768251232-674509 X-HE-Meta: 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 benj6jDj emSBTTtZv27MMefpKUl+loAbPLCsomRpq1n1bErT5R9RjN+GedW4FV8tNXjkuQ9M5+YSevwwEEi9eOVTKvoL8xixXuFmkaxsmDfDaGJmqS9aOxg1FpnfaPBlG94qY2Yr08rxbgMPa95RTTg5DxjDrLkAOW8NLq2iRcrNU1cps+25Swp4RwUUZjcG4+UqKTeIab8Yr1W9ezr9jiVDxnJYHgCfqoQQsSu0ePeiPtCklKe9zAfNOvCpicCkl7qAGhKNvFDAoDq6DlgRTDVi803n/7e8l3ii7VBPvou0fbaejavuEgCIk672GAJLPMQd3IO9Hep3gs245r3ThPe8= 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 Mon, 12 Jan 2026 20:08:23 +0000 Maciej Wiecz=F3r-Retman wrote: > >OK, known issues and they are understandable. With this patchset is > >there any way in which our testers can encounter these things? If so > >can we make changes to protect them from hitting known issues? >=20 > The gcc documentation states that the -fsanitize=3Dkernel-hwaddress is > similar to -fsanitize=3Dhwaddress, which only works on AArch64. So that > hints that it shouldn't work. >=20 > But while with KASAN sw_tags enabled the kernel compiles fine with gcc, > at least in my patched qemu it doesn't run. I remember Ada Couprie Diaz > mention that passing -march=3Darrowlake might help since the tag support > seems to be based on arch. >=20 > I'll check if there's a non-hacky way to have gcc work too, but perhaps > to minimize hitting known issue, for now HAVE_ARCH_KASAN_SW_TAGS should > be locked behind both ADDRESS_MASKING and CC_IS_CLANG in the Kconfig? Yes please - my main concern is that we avoid causing any disruption to testers/buildbots/fuzzers/etc.