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Sat, 22 Feb 2025 07:08:38 -0800 (PST) MIME-Version: 1.0 References: <2a2f08bc8118b369610d34e4d190a879d44f76b8.1739866028.git.maciej.wieczor-retman@intel.com> In-Reply-To: From: Andrey Konovalov Date: Sat, 22 Feb 2025 16:08:25 +0100 X-Gm-Features: AWEUYZkHzCChafiSRX_ILBVkyvuq6LP-GPRD5NbeLAJBmqWSC9A2XvM186wgsYI Message-ID: Subject: Re: [PATCH v2 13/14] x86: runtime_const used for KASAN_SHADOW_END To: Maciej Wieczor-Retman Cc: kees@kernel.org, julian.stecklina@cyberus-technology.de, kevinloughlin@google.com, peterz@infradead.org, tglx@linutronix.de, justinstitt@google.com, catalin.marinas@arm.com, wangkefeng.wang@huawei.com, bhe@redhat.com, ryabinin.a.a@gmail.com, kirill.shutemov@linux.intel.com, will@kernel.org, ardb@kernel.org, jason.andryuk@amd.com, dave.hansen@linux.intel.com, pasha.tatashin@soleen.com, ndesaulniers@google.com, guoweikang.kernel@gmail.com, dwmw@amazon.co.uk, mark.rutland@arm.com, broonie@kernel.org, apopple@nvidia.com, bp@alien8.de, rppt@kernel.org, kaleshsingh@google.com, richard.weiyang@gmail.com, luto@kernel.org, glider@google.com, pankaj.gupta@amd.com, pawan.kumar.gupta@linux.intel.com, kuan-ying.lee@canonical.com, tony.luck@intel.com, tj@kernel.org, jgross@suse.com, dvyukov@google.com, baohua@kernel.org, samuel.holland@sifive.com, dennis@kernel.org, akpm@linux-foundation.org, thomas.weissschuh@linutronix.de, surenb@google.com, kbingham@kernel.org, ankita@nvidia.com, nathan@kernel.org, ziy@nvidia.com, xin@zytor.com, rafael.j.wysocki@intel.com, andriy.shevchenko@linux.intel.com, cl@linux.com, jhubbard@nvidia.com, hpa@zytor.com, scott@os.amperecomputing.com, david@redhat.com, jan.kiszka@siemens.com, vincenzo.frascino@arm.com, corbet@lwn.net, maz@kernel.org, mingo@redhat.com, arnd@arndb.de, ytcoode@gmail.com, xur@google.com, morbo@google.com, thiago.bauermann@linaro.org, linux-doc@vger.kernel.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Queue-Id: 7F96220002 X-Stat-Signature: 3cgnhhpoqjgs7ehofmd1z94yenfsoqnt X-Rspamd-Server: rspam03 X-HE-Tag: 1740236919-117142 X-HE-Meta: U2FsdGVkX18ZoLPASVoo8ei9phV5u5JHSirxkjk9b5VSmZt5PLZWqISZtRJngeXVvzZaUN/afJOt3yicLxW5mJmpnBnDUmzktaV45GWbesviT+mrWbkAWCYZwE0RW96jZkrF8bPJtK1X2Y/sfCoswVKGwbOgs8HT32DKr7+D1P+wUqWgZTsksv6+oz8zwtRhwynM9WvZ9qS/0KgeP156TO6aXkRoq/Q5TK5XNpN+pXI8udTPw+X5J39HOghKMaT7jxjZj2Za4JWWvzOgjRFc/Z7Smwt666LyshIl09FEwEk6TUufyYn+gHLPsfs9MCVbk+ALpH3Uz8v1eoPCqdc4WcT+UKsiCIifVlMVYVVwiNeujmLOFZ2WMQBP+9d//7F9YI1cwoP2GiaGCCafE0dQD29LIC4QKl9C5ZGMlC4ZTAdv3p7OX2+CJdxtt/VKv5wPE/SxnfVqRz+DI/t+Vno9GPA6KSyOxzXtpLISYCmC3hG4ppq2S6VD632bWkk+C9cqa83wy7JR1SNl4rO/U+MPDu6P6ZkpwiEOroi8VZANHbBiDcKJXbMWS/scNsDrmd6HqiVIL+FCeCEl77yxmSIe2i29iT8nzoFrOY2yGMCxtEGwCk4CFmyWM9t2MV4vB8G05JgcE2sPyymdu2jG2+VBfD80AzBQS1AK6euW58TSi33Z8AQntdC4AzfOJiCKr1O5Qz6k3v/sUM3OTitN/UdkV830rMsOsnRaCigzKNbsB7AGh9HV38N9nolEKF2Zergl427sEmPAdu26VXB7TA0wqYfdfwwEPOykoRkWef97xsodUkSuz+oIH8osocMOusg0WPOxfBLGQPZsWwn349y0xuLw5d4mPm6+ftqWmyhNUt+3Ky6byn45qTImq8miyRTdsDEdxN3QZ5PZcZCWFXFv0tFbXPAwyKo4QToY0I3v16xrbc1u2iW4hbZmH5jvz1nzTS4Hs5if/vfOGli8qE2 7B/DP0QC ckgs8RMT2FpyaT4ERRvSQX+zF8gi1cVnL4DepJVjftkuSaeNPpMgKKaQrUhMalpOsfKzAUEuBgWyZBgSL6b+kHSZl1iNXVWLsZIbuWu61wdejcprs/SmRttctlwV09UuKul4BzIJXhaG/oq6fw5gzARP+3YpJUiG/IItFHgVai5i/p4KVGkBRU+OEiXSeyO8uqi70A4Gn9iJe980VnyqP497854cB541bf8WiLfaPdpQY/SfRMDUymMyJdKOdGOtLDwNitacFiX9ErR1KXJAZA3YD1MofBrhEwvROv+6VAQbQP1AwjwePqUsKL9YZhyIO6MqBNalNbQglX1TC37uSnDdbi92vcAlfn0vX93ndFii61/XKhieAT68iKW3D1fK6gaqMm1RVQF7MGVaLcgEcE/nfjUbxIFLjtWoxcfPgUjNzQWqACJdbm5+q+/1cnnLH06Ysr4gqGPJwl/yPO1nZC11zlcz7S7xsJuUUc4f+i6BssH8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.024590, 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 Fri, Feb 21, 2025 at 4:27=E2=80=AFPM Maciej Wieczor-Retman wrote: > > Also I was wondering if you know what "hwasan-mapping-offset-dynamic" opt= ion is? > I noticed it in the llvm docs but can't find a good description what it d= oes, > even from looking at the code in HWAddressSanitizer.cpp. If > hwasan-mapping-offset is not implemeneted for x86 I doubt this is but may= be it > could help in a cleaner makefile for x86 at least? Especially once these = options > will be working in x86 llvm. Yeah, reading the code [1] works better to understand these options. My understanding is that specifying -hwasan-mapping-offset-dynamic=3Dglobal without -hwasan-mapping-offset would make the generated code get the shadow memory address from the __hwasan_shadow_memory_dynamic_address global variable. This option is in the common code, so it should work on x86 too. But I believe it's intended for userspace, not sure if it would work for the kernel. Even if we use this option, I don't get how it would make the Makefile cleaner - to me it already looks clean tbh :) But it will possibly make KASAN work slower. [1] https://github.com/llvm/llvm-project/blob/llvmorg-21-init/llvm/lib/Tran= sforms/Instrumentation/HWAddressSanitizer.cpp#L1929