From patchwork Wed Aug 29 11:35:14 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10580005 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 B4B6C17DE for ; Wed, 29 Aug 2018 11:36:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A45842AA9C for ; Wed, 29 Aug 2018 11:36:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 976BC2AB91; Wed, 29 Aug 2018 11:36:44 +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 439692AA9C for ; Wed, 29 Aug 2018 11:36:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728592AbeH2PcO (ORCPT ); Wed, 29 Aug 2018 11:32:14 -0400 Received: from mail-wr1-f67.google.com ([209.85.221.67]:33695 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728567AbeH2PcN (ORCPT ); Wed, 29 Aug 2018 11:32:13 -0400 Received: by mail-wr1-f67.google.com with SMTP id v90-v6so4506695wrc.0 for ; Wed, 29 Aug 2018 04:35:44 -0700 (PDT) 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=OrkXoXQH/F+TSi0uzJOTsE67Q+iABNFRWIJoC0xEk4I=; b=WTz2QY2HKqYf+swr0X7Ae2YyC/6YPEZ7qJCGjn+gto47vutHzDmySwPeJpJN11E0ZE 5/N+Lf5FI2i9lD6qnaIKa8vC/iEgp6tV3xlwZxOCsUOpRsPK5x8OxbGPeHqoaLRnz3tl 9y2MSALdGNvdhBDLQvs0+f/FvlAZbS/GTFpeuBXd0Di7KJovjN8/Xes0AHrVObh18/kk l3VioLZaGqerA6Z1z05WFImABwS9LljXfzhrpinvyCSxMUXJUyb6Mgz0x0wZN2PV/gRR k8/pJKOTpSsY6SdKFgIhYeExLmV+9l/hayV09vG0Ai1tN5FuaJADVtrnzjbraHGluFQU kEgg== 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=OrkXoXQH/F+TSi0uzJOTsE67Q+iABNFRWIJoC0xEk4I=; b=Yf4R9k4Wulf14POzAEgyFEQYLUpbQ40Fovstu4e8W4wEIdmMb7/jJaKb/ynUlQeS2E 5a8d/IA1EZ/SZjOxIW225cMo2QBHapyUKPldRo20twvbg1wrVaA4PkbuEnGioTnYD6Uc lwRB0GQ8TUIzuGH0djO2/xsw3svdQdMfNZiTSsgbl8ueGBYDzd+mniE2FVoJSkKa8P/3 LPkruFXLMBvDQ+1NSwuO+cigaQ25e9JUAgPIYC/1ioOvbtDPqG5LAeVdHHGbrYqwkGsc fa8n5MPkfkZL0zAv3sQkpCVQjs9mzQB711AMKpCX1eSOTrgXkgrDBXtBw89q6HJopQI1 S1hg== X-Gm-Message-State: APzg51A1gfDRsH9X1WzHSo3RoU8jJ8cBTT161Dfxb/DlH2CbS7PtFbNE vd06l3f1QF/L08uZ7eNFpi7myw== X-Google-Smtp-Source: ANB0Vdb/wq3vWEnItljvIkYES5qFH6+aaA3t/puEBlFbr7sKQYhGOPxWZqcCP6CtYnWV4cowVJ+NpA== X-Received: by 2002:adf:a512:: with SMTP id i18-v6mr4050713wrb.220.1535542543576; Wed, 29 Aug 2018 04:35:43 -0700 (PDT) Received: from andreyknvl0.muc.corp.google.com ([2a00:79e0:15:10:84be:a42a:826d:c530]) by smtp.gmail.com with ESMTPSA id s10-v6sm7800454wmd.22.2018.08.29.04.35.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 29 Aug 2018 04:35:43 -0700 (PDT) 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 v6 10/18] khwasan, arm64: enable top byte ignore for the kernel Date: Wed, 29 Aug 2018 13:35:14 +0200 Message-Id: X-Mailer: git-send-email 2.19.0.rc0.228.g281dcd1b4d0-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 KHWASAN 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 KHWASAN is used. 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 fd208eac9f2a..483aceedad76 100644 --- a/arch/arm64/include/asm/pgtable-hwdef.h +++ b/arch/arm64/include/asm/pgtable-hwdef.h @@ -289,6 +289,7 @@ #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 03646e6a2ef4..c5175e098d02 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_HW +#define TCR_KASAN_FLAGS TCR_TBI1 +#else +#define TCR_KASAN_FLAGS 0 +#endif + #define MAIR(attr, mt) ((attr) << ((mt) * 8)) /* @@ -440,7 +446,7 @@ 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 /*