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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=pBsGqTIqbR91modi76ePsvmJJRuaBk1hVSkVG5VFwBQ=; b=Y81FijVzupOF/pFBcc8bI1F6FrU8Jy0OMqSfSWISO6L0IxdA/tjeHsYgUnN4njILAy p7SO1qZi8j1wmpZrrozGWUXKUQ9Vw2ZZcCnApU0dhK+T3pze3sEGK6nOQppEsHEBIIT+ tg3akLgso7YVY2TIQmvzsBg6gH3f7dkpo3ioPXaqezo9H2QazKOsW5oWAg7y+honQzqz fCebBiUthG1iafNojeOmW1w1uYHc7Pj+yIgcWpGecpNFer8BKCUo1h7r0pWqekeJ6RTG /1bjMhOICjj9ObdzLo0pkDnXWig9925QzeIFukBUFtfD7Infyiqks55NGfSwYJGgdrh8 2/pA== X-Gm-Message-State: AOAM532pAXrHoP11UMvPDp7gio31H4zr5koWN8kjaynQci9oQUXF8C8V gB3l0veQNSCUbePkQ6nfek81x6Frug6qz8Qt X-Google-Smtp-Source: ABdhPJw8M8WWCio4qpRA1ZXyUA8Var1LZEn3zoWxmx7gA98yPdjDztcJ9EMI1/V5rg5Qsem0Jb9eVOShbM9zEULm X-Received: from andreyknvl3.muc.corp.google.com ([2a00:79e0:15:13:7220:84ff:fe09:7e9d]) (user=andreyknvl job=sendgmr) by 2002:a17:906:8559:: with SMTP id h25mr21784179ejy.536.1600204643277; Tue, 15 Sep 2020 14:17:23 -0700 (PDT) Date: Tue, 15 Sep 2020 23:16:07 +0200 In-Reply-To: Message-Id: <859111cf1d862ce26f094cf14511461c372e5bbc.1600204505.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.28.0.618.gf4bc123cb7-goog Subject: [PATCH v2 25/37] arm64: kasan: Enable in-kernel MTE From: Andrey Konovalov To: Dmitry Vyukov , Vincenzo Frascino , Catalin Marinas , kasan-dev@googlegroups.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200915_171727_989059_78F78155 X-CRM114-Status: GOOD ( 17.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marco Elver , Elena Petrova , Andrey Konovalov , Kevin Brodsky , Will Deacon , Branislav Rankov , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Alexander Potapenko , linux-arm-kernel@lists.infradead.org, Andrey Ryabinin , Andrew Morton , Evgenii Stepanov 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 From: Vincenzo Frascino Hardware tag-based KASAN relies on Memory Tagging Extension (MTE) feature and requires it to be enabled. The Tag Checking operation causes a synchronous data abort as a consequence of a tag check fault when MTE is configured in synchronous mode. Enable MTE in Synchronous mode in EL1 to provide a more immediate way of tag check failure detection in the kernel. As part of this change enable match-all tag for EL1 to allow the kernel to access user pages without faulting. This is required because the kernel does not have knowledge of the tags set by the user in a page. Note: For MTE, the TCF bit field in SCTLR_EL1 affects only EL1 in a similar way as TCF0 affects EL0. Signed-off-by: Vincenzo Frascino Signed-off-by: Andrey Konovalov --- Change-Id: I4d67497268bb7f0c2fc5dcacefa1e273df4af71d --- arch/arm64/kernel/cpufeature.c | 7 +++++++ arch/arm64/mm/proc.S | 13 +++++++++++++ 2 files changed, 20 insertions(+) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index add9da5d8ea3..eca06b8c74db 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1718,6 +1718,13 @@ static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap) cleared_zero_page = true; mte_clear_page_tags(lm_alias(empty_zero_page)); } + + /* Enable in-kernel MTE only if KASAN_HW_TAGS is enabled */ + if (IS_ENABLED(CONFIG_KASAN_HW_TAGS)) { + /* Enable MTE Sync Mode for EL1 */ + sysreg_clear_set(sctlr_el1, SCTLR_ELx_TCF_MASK, SCTLR_ELx_TCF_SYNC); + isb(); + } } #endif /* CONFIG_ARM64_MTE */ diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index 23c326a06b2d..5ba7ac5e9c77 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -427,6 +427,10 @@ SYM_FUNC_START(__cpu_setup) */ mov_q x5, MAIR_EL1_SET #ifdef CONFIG_ARM64_MTE + mte_present .req x20 + + mov mte_present, #0 + /* * Update MAIR_EL1, GCR_EL1 and TFSR*_EL1 if MTE is supported * (ID_AA64PFR1_EL1[11:8] > 1). @@ -447,6 +451,8 @@ SYM_FUNC_START(__cpu_setup) /* clear any pending tag check faults in TFSR*_EL1 */ msr_s SYS_TFSR_EL1, xzr msr_s SYS_TFSRE0_EL1, xzr + + mov mte_present, #1 1: #endif msr mair_el1, x5 @@ -485,6 +491,13 @@ SYM_FUNC_START(__cpu_setup) orr x10, x10, #TCR_HA // hardware Access flag update 1: #endif /* CONFIG_ARM64_HW_AFDBM */ +#ifdef CONFIG_ARM64_MTE + /* Update TCR_EL1 if MTE is supported (ID_AA64PFR1_EL1[11:8] > 1) */ + cbz mte_present, 1f + orr x10, x10, #SYS_TCR_EL1_TCMA1 +1: + .unreq mte_present +#endif msr tcr_el1, x10 /* * Prepare SCTLR -- 2.28.0.618.gf4bc123cb7-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel