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Wed, 22 Feb 2023 16:46:58 +0000 (UTC) From: Catalin Marinas To: andreyknvl@gmail.com, Peter Collingbourne Cc: Will Deacon , Qun-wei Lin , Guangye Yang , linux-mm@kvack.org, Chinwen Chang , kasan-dev@googlegroups.com, ryabinin.a.a@gmail.com, linux-arm-kernel@lists.infradead.org, vincenzo.frascino@arm.com, eugenis@google.com, Kuan-Ying Lee , stable@vger.kernel.org Subject: Re: [PATCH v2] arm64: Reset KASAN tag in copy_highpage with HW tags only Date: Wed, 22 Feb 2023 16:46:56 +0000 Message-Id: <167708438950.477413.8786796815107449095.b4-ty@arm.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230215050911.1433132-1-pcc@google.com> References: <20230215050911.1433132-1-pcc@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: A1910C0010 X-Rspamd-Server: rspam01 X-Stat-Signature: ruo7ddd1j5ucu88xw14e4s9cqhtsjzgo X-HE-Tag: 1677084423-283695 X-HE-Meta: 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 cHuImQoy 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 14 Feb 2023 21:09:11 -0800, Peter Collingbourne wrote: > During page migration, the copy_highpage function is used to copy the > page data to the target page. If the source page is a userspace page > with MTE tags, the KASAN tag of the target page must have the match-all > tag in order to avoid tag check faults during subsequent accesses to the > page by the kernel. However, the target page may have been allocated in > a number of ways, some of which will use the KASAN allocator and will > therefore end up setting the KASAN tag to a non-match-all tag. Therefore, > update the target page's KASAN tag to match the source page. > > [...] Applied to arm64 (for-next/core), thanks! [1/1] arm64: Reset KASAN tag in copy_highpage with HW tags only https://git.kernel.org/arm64/c/e74a68468062 -- Catalin