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Fri, 16 Jan 2026 05:34:18 -0800 (PST) Message-ID: <1f821f5a-403b-4dad-b9d8-239c9b039000@gmail.com> Date: Fri, 16 Jan 2026 14:33:33 +0100 Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 03/14] kasan: Fix inline mode for x86 tag-based mode To: Maciej Wieczor-Retman , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Nathan Chancellor , Nicolas Schier , Nick Desaulniers , Bill Wendling , Justin Stitt Cc: Maciej Wieczor-Retman , kasan-dev@googlegroups.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev References: <1598e2bb7d45902fb0dc4d0d8e218f61b0c1a0f6.1768233085.git.m.wieczorretman@pm.me> Content-Language: en-US From: Andrey Ryabinin In-Reply-To: <1598e2bb7d45902fb0dc4d0d8e218f61b0c1a0f6.1768233085.git.m.wieczorretman@pm.me> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 1/12/26 6:27 PM, Maciej Wieczor-Retman wrote: > From: Maciej Wieczor-Retman > > The LLVM compiler uses hwasan-instrument-with-calls parameter to setup > inline or outline mode in tag-based KASAN. If zeroed, it means the > instrumentation implementation will be pasted into each relevant > location along with KASAN related constants during compilation. If set > to one all function instrumentation will be done with function calls > instead. > > The default hwasan-instrument-with-calls value for the x86 architecture > in the compiler is "1", which is not true for other architectures. > Because of this, enabling inline mode in software tag-based KASAN > doesn't work on x86 as the kernel script doesn't zero out the parameter > and always sets up the outline mode. > > Explicitly zero out hwasan-instrument-with-calls when enabling inline > mode in tag-based KASAN. > > Signed-off-by: Maciej Wieczor-Retman > Reviewed-by: Andrey Konovalov > Reviewed-by: Alexander Potapenko > --- Reviewed-by: Andrey Ryabinin