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([23.254.208.9]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-368b4b8e9c6sm3556805eec.1.2026.10.21.19.18.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2026 19:18:38 -0700 (PDT) From: Qiliang Yuan To: Andrey Ryabinin Cc: Russell King , Catalin Marinas , Will Deacon , Mark Rutland , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , "Ritesh Harjani (IBM)" , Shrikanth Hegde , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Shuah Khan , Marco Elver , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Andrew Morton , linux-arm-kernel@lists.infradead.org, Kees Cook , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-kselftest@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, Peter Collingbourne Subject: Re: [PATCH 1/2] word-at-a-time: check the first byte in load_unaligned_zeropad() Date: Thu, 22 Oct 2026 10:18:20 +0800 Message-ID: <20261022021820.1789083-1-odys.yuan@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: <20261019-bug-word-at-a-time-zeropad-kasan-v1-0-f21a3ed6a477@gmail.com> <20261019-bug-word-at-a-time-zeropad-kasan-v1-1-f21a3ed6a477@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Tue, 20 Oct 2026 12:58:54 -0400, Andrey Ryabinin wrote: >> + /* open-coded instrument_read(addr, 1), as in read_word_at_a_time() */ > > Why it's open-coded ? For the same reason as read_word_at_a_time(): commit ece69af2ede1 ("rwonce: handle KCSAN like KASAN in read_word_at_a_time()") open-coded it "to avoid having to pull the entire instrumented.h header into rwonce.h". I kept the six asm/word-at-a-time.h headers to the same two small headers, kasan-checks.h and kcsan-checks.h, rather than pulling in instrumented.h with linux/bug.h and kmsan-checks.h. Thanks, Qiliang