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Fri, 30 Apr 2021 07:40:15 -0700 (PDT) MIME-Version: 1.0 From: Derrick McKee Date: Fri, 30 Apr 2021 10:40:04 -0400 Message-ID: Subject: PAC key changes when kernel code is preempted To: Yianni Giannaris , Linux ARM , mark.rutland@arm.com, suzuki.poulose@arm.com, Catalin Marinas , james.morse@arm.com, amit.kachhap@arm.com, will@kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210430_074017_549424_085A7883 X-CRM114-Status: UNSURE ( 7.83 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, I am noticing that when kernel code is preempted, PAC keys seem to change when resuming execution. For instance, when I read APDAKeyHi_EL1 and APDAKeyLo_EL1, sleep, and read them again, the values are different. Is this the intended behavior? If so, how can I ensure that the keys do not change? The different keys are causing PAC authentication to fail on pointers signed using the stale key. Thanks. -- Derrick McKee Email: derrick.mckee@gmail.com _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel