Received: by 2002:a25:ef43:0:0:0:0:0 with SMTP id w3csp308748ybm; Thu, 28 May 2020 03:21:44 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzgcikDsg7hsb+4zAl8Dax3M2+Mrxyef6LO8IWrJABb5GInNS+6Ry5R32qjdIb3ViCMXUwG X-Received: by 2002:a05:6402:144e:: with SMTP id d14mr1232540edx.14.1590661304313; Thu, 28 May 2020 03:21:44 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1590661304; cv=none; d=google.com; s=arc-20160816; b=fuZLuOeUMfQpGB/itjefACpEM1yYiXEc8QqkGaqOPwWNeujqEX9rOw9YC4c3PC40qG XMa1a84EH1CMmd3/m/8LBXwwkhAE0kB9MvNsjYo/fjOlQT8sYyG5PcomhNTa4FXw7GDP mdny3unq7Z21JPiCopIFf7aDHNTmg+qQ9V4muZ3f151/r0u+F+K/Fa4zR5nVLQr/oR/r EgTqeyZM46GzvgWOHNkI1NB0jOGhyW/LPFZI2yI7RryYXCpFI0LUJ5Gp582r1+ML0kMe fWrGPBWkp1UjDHZeHPV/Nq64iHS3jrL5k0uRRCmd7+RGcoViQX+POuPfVBtJy4cYJuTr Ogvg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:date:cc:to:subject:from:message-id; bh=ETxyjebBKwJDCTq+J/l2j51IYXoUC5QoQQ5fhTUKhRc=; b=tSR96MnvA/zzC4kk5tj1KGddHljni5MRA2uJsVcu5V9YphDCkVoXLJfJ/u44N1u4zr CYTYDalXhP0d8O2kJektRTouDM4ZXMrKJLJBp9ZiJf3J0QvnC9UzsjrNBAhf9qG4W7WJ zSNFmsgw0zp+C8TnA0K1JDb3IVIZaAF37sZKp5AKWn9C9rdkqmqWT4YHA42SjOD86A4g +JS+HTcllE0mXObXTG29/SFrWPuwxJ0NFODz3YXeguOgn64vmSZc/W2cbokxrTwQo1aA 5csp8MWSf/fq5W6JlzCtcsYEyJAg+7SfsYT2EMqvz1MOoh8qXoyM2exmWN8TCW6gdmtO pmlQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id dg13si3522193edb.330.2020.05.28.03.21.21; Thu, 28 May 2020 03:21:44 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387740AbgE1KRK (ORCPT + 99 others); Thu, 28 May 2020 06:17:10 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:27694 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387677AbgE1KRJ (ORCPT ); Thu, 28 May 2020 06:17:09 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 49XkC35QDRz9v2VX; Thu, 28 May 2020 12:17:03 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id vKnYqLkA819M; Thu, 28 May 2020 12:17:03 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 49XkC34Wf4z9v2Tv; Thu, 28 May 2020 12:17:03 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 3DE918B797; Thu, 28 May 2020 12:17:05 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id gQVUZ4WXfqwl; Thu, 28 May 2020 12:17:05 +0200 (CEST) Received: from pc16570vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id E56B68B794; Thu, 28 May 2020 12:17:04 +0200 (CEST) Received: by pc16570vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 55AF565A60; Thu, 28 May 2020 10:17:04 +0000 (UTC) Message-Id: <7195fcde7314ccbf7a081b356084a69d421b10d4.1590660977.git.christophe.leroy@csgroup.eu> From: Christophe Leroy Subject: [PATCH] powerpc/32: disable KASAN with pages bigger than 16k To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Date: Thu, 28 May 2020 10:17:04 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mapping of early shadow area is implemented by using a single static page table having all entries pointing to the same early shadow page. The shadow area must therefore occupy full PGD entries. The shadow area has a size of 128Mbytes starting at 0xf8000000. With 4k pages, a PGD entry is 4Mbytes With 16k pages, a PGD entry is 64Mbytes With 64k pages, a PGD entry is 256Mbytes which is too big. Until we rework the early shadow mapping, disable KASAN when the page size is too big. Reported-by: kbuild test robot Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy --- arch/powerpc/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 1dfa59126fcf..066b36bf9efa 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -169,8 +169,8 @@ config PPC select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU select HAVE_ARCH_JUMP_LABEL - select HAVE_ARCH_KASAN if PPC32 - select HAVE_ARCH_KASAN_VMALLOC if PPC32 + select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14 + select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14 select HAVE_ARCH_KGDB select HAVE_ARCH_MMAP_RND_BITS select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT -- 2.25.0