From patchwork Tue Nov 27 16:55:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10700997 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 83D6E14E2 for ; Tue, 27 Nov 2018 16:57:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 70B9E2C425 for ; Tue, 27 Nov 2018 16:57:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 63E732C449; Tue, 27 Nov 2018 16:57:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 02A5C2C449 for ; Tue, 27 Nov 2018 16:57:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731724AbeK1Dys (ORCPT ); Tue, 27 Nov 2018 22:54:48 -0500 Received: from mail-wr1-f65.google.com ([209.85.221.65]:36097 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731719AbeK1Dyq (ORCPT ); Tue, 27 Nov 2018 22:54:46 -0500 Received: by mail-wr1-f65.google.com with SMTP id t3so23446012wrr.3 for ; Tue, 27 Nov 2018 08:56:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=5TjQJgkFl+PVCxLsWj9vCgbjvK0haYDKUt+yI6asfBc=; b=Vq8xJz4L04oXAVPDvOzYuzz+wHl1QGBnQgoEk8zjm/CZt1EqPmCV4MXLs83CCDHriG nZQo2iAfvSYq4/G3CcCYjx4+keudcdowz/V+f1xuztB78kVIxdEUZPxUlxAPXdNGfB8r xuY642dJ4/Jr9SFclo8bI/fnE/NGVNXmJm4HZJ33i2h7k3awNqoEHgHv2j3ghoHSetBq N8DthHjipq15+ycjHXS4dovDb+hu7nsTOkP31YrSMZgr2yUOtGuEakHyfOu0gQJ0gQKp +mRR4yL+iYIE+weqA0Qvd988IjrsHCP9yGsIKBnEAOfNH/W7HPJ8EjTjXk2hbR05NzUV UPEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=5TjQJgkFl+PVCxLsWj9vCgbjvK0haYDKUt+yI6asfBc=; b=kohJwbF1yaZZeUp/oNacwrO7xf3lnkCInDyIzoD0Dqliv3rnmRjhdWSMHVUQdyDeNZ BUHU8mDSyIp2tfdkgIbh9SJY3wEGrPiT4200uX0PWLIlD+JYIo2Jgw4eqAnPo62OzIfz /BaRCYcVTHSc3HDsMtkILuIg4nUK214sH/2fZdkdMd+6IVvDV86QmYN4ZAetg51yBPkO 0OI1ljll6I3a65HLJSL1aCw9n0BCtmAm2asu2Eo4H2IX4Nrjq4CjjLUS73qxqdjk9WXz EqmbOq/+MFWDgTfKBQ8jw4jw3ZV0ZL2t9EJzSCc+wMPoyD2z7yj2eVGBh/YPdJGjw92c a9aQ== X-Gm-Message-State: AA+aEWY25oujXm7pg1HhUtQE0lvJ5DysyV6CZ+/Nh2YRjDSr5DvEHHIL BBVzIbcIWBc2Wr01/W7GkhqWHw== X-Google-Smtp-Source: AFSGD/VnXoSEtN3ApgD8MSpZdtG9X13UEEYBU7XpEpIdqGrEHViBzH7UhGky5kkFLvu375ZFYdDdzA== X-Received: by 2002:adf:c711:: with SMTP id k17mr15658939wrg.197.1543337774345; Tue, 27 Nov 2018 08:56:14 -0800 (PST) Received: from andreyknvl0.muc.corp.google.com ([2a00:79e0:15:10:3180:41f8:3010:ff61]) by smtp.gmail.com with ESMTPSA id k73sm6383099wmd.36.2018.11.27.08.56.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 27 Nov 2018 08:56:13 -0800 (PST) From: Andrey Konovalov To: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Catalin Marinas , Will Deacon , Christoph Lameter , Andrew Morton , Mark Rutland , Nick Desaulniers , Marc Zyngier , Dave Martin , Ard Biesheuvel , "Eric W . Biederman" , Ingo Molnar , Paul Lawrence , Geert Uytterhoeven , Arnd Bergmann , "Kirill A . Shutemov" , Greg Kroah-Hartman , Kate Stewart , Mike Rapoport , kasan-dev@googlegroups.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sparse@vger.kernel.org, linux-mm@kvack.org, linux-kbuild@vger.kernel.org Cc: Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Jann Horn , Mark Brand , Chintan Pandya , Vishwath Mohan , Andrey Konovalov Subject: [PATCH v12 14/25] kasan, arm64: enable top byte ignore for the kernel Date: Tue, 27 Nov 2018 17:55:32 +0100 Message-Id: <1ed03d53ee679cba52ba7118d2acbef948d21fcc.1543337629.git.andreyknvl@google.com> X-Mailer: git-send-email 2.20.0.rc0.387.gc7a69e6b6c-goog In-Reply-To: References: MIME-Version: 1.0 Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Tag-based KASAN uses the Top Byte Ignore feature of arm64 CPUs to store a pointer tag in the top byte of each pointer. This commit enables the TCR_TBI1 bit, which enables Top Byte Ignore for the kernel, when tag-based KASAN is used. Reviewed-by: Andrey Ryabinin Reviewed-by: Dmitry Vyukov Signed-off-by: Andrey Konovalov --- arch/arm64/include/asm/pgtable-hwdef.h | 1 + arch/arm64/mm/proc.S | 8 +++++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h index 1d7d8da2ef9b..d43b870c39b3 100644 --- a/arch/arm64/include/asm/pgtable-hwdef.h +++ b/arch/arm64/include/asm/pgtable-hwdef.h @@ -291,6 +291,7 @@ #define TCR_A1 (UL(1) << 22) #define TCR_ASID16 (UL(1) << 36) #define TCR_TBI0 (UL(1) << 37) +#define TCR_TBI1 (UL(1) << 38) #define TCR_HA (UL(1) << 39) #define TCR_HD (UL(1) << 40) #define TCR_NFD1 (UL(1) << 54) diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index 2c75b0b903ae..d861f208eeb1 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -47,6 +47,12 @@ /* PTWs cacheable, inner/outer WBWA */ #define TCR_CACHE_FLAGS TCR_IRGN_WBWA | TCR_ORGN_WBWA +#ifdef CONFIG_KASAN_SW_TAGS +#define TCR_KASAN_FLAGS TCR_TBI1 +#else +#define TCR_KASAN_FLAGS 0 +#endif + #define MAIR(attr, mt) ((attr) << ((mt) * 8)) /* @@ -445,7 +451,7 @@ ENTRY(__cpu_setup) */ ldr x10, =TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \ TCR_TG_FLAGS | TCR_KASLR_FLAGS | TCR_ASID16 | \ - TCR_TBI0 | TCR_A1 + TCR_TBI0 | TCR_A1 | TCR_KASAN_FLAGS tcr_set_idmap_t0sz x10, x9 /*