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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id g19sm11133394qtb.2.2019.10.08.04.42.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Oct 2019 04:42:48 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH] kasan: fix the missing underflow in memmove and memcpy with CONFIG_KASAN_GENERIC=y Date: Tue, 8 Oct 2019 07:42:47 -0400 Message-Id: References: <1570532528.4686.102.camel@mtksdccf07> Cc: Dmitry Vyukov , Andrey Ryabinin , Alexander Potapenko , Matthias Brugger , LKML , kasan-dev , Linux-MM , Linux ARM , linux-mediatek@lists.infradead.org, wsd_upstream In-Reply-To: <1570532528.4686.102.camel@mtksdccf07> To: Walter Wu X-Mailer: iPhone Mail (17A860) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000244, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Oct 8, 2019, at 7:02 AM, Walter Wu wrote: >=20 > I don't know very well in UBSAN, but I try to build ubsan kernel and > test a negative number in memset and kmalloc_memmove_invalid_size(), it > look like no check. It sounds like more important to figure out why the UBSAN is not working in t= his case rather than duplicating functionality elsewhere.=