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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48fe5cab882sm197265945e9.13.2026.05.17.07.14.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 May 2026 07:14:46 -0700 (PDT) Date: Sun, 17 May 2026 15:14:44 +0100 From: David Laight To: Thorsten Blum Cc: Andy Shevchenko , Andrew Morton , Kees Cook , Andy Shevchenko , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: Re: [PATCH] string: use min in sized_strscpy Message-ID: <20260517151444.66dc4afb@pumpkin> In-Reply-To: References: <20260514165601.527883-3-thorsten.blum@linux.dev> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 15 May 2026 17:09:02 +0200 Thorsten Blum wrote: > On Fri, May 15, 2026 at 09:45:08AM +0300, Andy Shevchenko wrote: . > How about adding > > #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) > #define bytes_to_page_end(p) (PAGE_SIZE - offset_in_page(p)) > > to a new header, e.g. include/linux/page_helpers.h? There are about 50+ > direct replacements and possibly more. > Why not put them in vdso/page.h just after PAGE_MASK. -- David