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Mon, 11 Dec 2023 02:49:54 -0800 (PST) MIME-Version: 1.0 References: <20231121220155.1217090-1-iii@linux.ibm.com> <20231121220155.1217090-29-iii@linux.ibm.com> In-Reply-To: <20231121220155.1217090-29-iii@linux.ibm.com> From: Alexander Potapenko Date: Mon, 11 Dec 2023 11:49:18 +0100 Message-ID: Subject: Re: [PATCH v2 28/33] s390/string: Add KMSAN support To: Ilya Leoshkevich Cc: Alexander Gordeev , Andrew Morton , Christoph Lameter , David Rientjes , Heiko Carstens , Joonsoo Kim , Marco Elver , Masami Hiramatsu , Pekka Enberg , Steven Rostedt , Vasily Gorbik , Vlastimil Babka , Christian Borntraeger , Dmitry Vyukov , Hyeonggon Yoo <42.hyeyoo@gmail.com>, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Mark Rutland , Roman Gushchin , Sven Schnelle Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 4E49FC0009 X-Stat-Signature: wu7fkjjrst4demj6iyb7zjwnes4qcozu X-Rspam-User: X-HE-Tag: 1702291795-440573 X-HE-Meta: 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 CgLhsCU3 B/yRGAlwDL51K5phSayur135U5rY/FRTA4tdzeaeNm7w6myHQBwnt0XfV8XSuLlv6dtNdFXvJgee0NNjdC4mXzs9EbWcXVZg1CpqP0GXDrT9DZnYccXPm0Ng5xbdF+TftjcFT9KnC0OWqAQJJO8x0iHur1SsoDRejNNQ7cn5cf/pC5R5mr+yuz1HGQA9pMEEO79AM1W4YDNTWY+BNjRjW9tP3FVzAbqHppx5ZRK7CpkBY47pAA63prvcIddcFAWfhRYyHN8FewISMZEnlsp1Nb/T8YV+4FLdUy46GtC7zIZGW9vBJWj+hWIb9Ak+v2e4dlxl/uAva16aocm5r3afScx5zlwOd5O3tCnTd X-Bogosity: Ham, tests=bogofilter, spamicity=0.000218, 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 Tue, Nov 21, 2023 at 11:03=E2=80=AFPM Ilya Leoshkevich wrote: > > Add KMSAN support for the s390 implementations of the string functions. > Do this similar to how it's already done for KASAN, except that the > optimized memset{16,32,64}() functions need to be disabled: it's > important for KMSAN to know that they initialized something. > > The way boot code is built with regard to string functions is > problematic, since most files think it's configured with sanitizers, > but boot/string.c doesn't. This creates various problems with the > memset64() definitions, depending on whether the code is built with > sanitizers or fortify. This should probably be streamlined, but in the > meantime resolve the issues by introducing the IN_BOOT_STRING_C macro, > similar to the existing IN_ARCH_STRING_C macro. > > Signed-off-by: Ilya Leoshkevich Reviewed-by: Alexander Potapenko