From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8F5A3C4332F for ; Mon, 3 Oct 2022 21:15:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229738AbiJCVPT (ORCPT ); Mon, 3 Oct 2022 17:15:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56586 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230266AbiJCVNx (ORCPT ); Mon, 3 Oct 2022 17:13:53 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 481A954650 for ; Mon, 3 Oct 2022 14:09:07 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DB7AE6120D for ; Mon, 3 Oct 2022 21:09:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 334CDC433C1; Mon, 3 Oct 2022 21:09:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1664831346; bh=74n/35mRCZv6diUR2BQQ26N0Arwb07twBeh+p0+4zsE=; h=Date:To:From:Subject:From; b=TiJNnYVHH9o2WmF0T2EGJHcM9TNLSziZSqoup9/KKqweV0EWkXbfD9iC8WwgU/wIX 7b8NWV2Si1xjPGBmjuVj6CJK1dH0zgnv8TIvn5zUYzeyz5mb28RfRjoNsyimvQXPWX ZrFoXRO8aOpL0xL5Cp4j0tmH3QBO+2eUWSUJeOFw= Date: Mon, 03 Oct 2022 14:09:05 -0700 To: mm-commits@vger.kernel.org, willy@infradead.org, viro@zeniv.linux.org.uk, vegard.nossum@oracle.com, vbabka@suse.cz, tglx@linutronix.de, sfr@canb.auug.org.au, rostedt@goodmis.org, rientjes@google.com, pmladek@suse.com, peterz@infradead.org, penberg@kernel.org, mst@redhat.com, mingo@redhat.com, mark.rutland@arm.com, luto@kernel.org, keescook@chromium.org, iii@linux.ibm.com, iamjoonsoo.kim@lge.com, herbert@gondor.apana.org.au, hch@lst.de, gregkh@linuxfoundation.org, gor@linux.ibm.com, elver@google.com, edumazet@google.com, ebiggers@kernel.org, ebiggers@google.com, dvyukov@google.com, cl@linux.com, bp@alien8.de, axboe@kernel.dk, ast@kernel.org, arnd@arndb.de, andreyknvl@google.com, andreyknvl@gmail.com, glider@google.com, akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] x86-fs-kmsan-disable-config_dcache_word_access.patch removed from -mm tree Message-Id: <20221003210906.334CDC433C1@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The quilt patch titled Subject: x86: fs: kmsan: disable CONFIG_DCACHE_WORD_ACCESS has been removed from the -mm tree. Its filename was x86-fs-kmsan-disable-config_dcache_word_access.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Alexander Potapenko Subject: x86: fs: kmsan: disable CONFIG_DCACHE_WORD_ACCESS Date: Thu, 15 Sep 2022 17:04:12 +0200 dentry_string_cmp() calls read_word_at_a_time(), which might read uninitialized bytes to optimize string comparisons. Disabling CONFIG_DCACHE_WORD_ACCESS should prohibit this optimization, as well as (probably) similar ones. Link: https://lkml.kernel.org/r/20220915150417.722975-39-glider@google.com Signed-off-by: Alexander Potapenko Suggested-by: Andrey Konovalov Cc: Alexander Viro Cc: Alexei Starovoitov Cc: Andrey Konovalov Cc: Andy Lutomirski Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Christoph Hellwig Cc: Christoph Lameter Cc: David Rientjes Cc: Dmitry Vyukov Cc: Eric Biggers Cc: Eric Biggers Cc: Eric Dumazet Cc: Greg Kroah-Hartman Cc: Herbert Xu Cc: Ilya Leoshkevich Cc: Ingo Molnar Cc: Jens Axboe Cc: Joonsoo Kim Cc: Kees Cook Cc: Marco Elver Cc: Mark Rutland Cc: Matthew Wilcox Cc: Michael S. Tsirkin Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Petr Mladek Cc: Stephen Rothwell Cc: Steven Rostedt Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vegard Nossum Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- arch/x86/Kconfig | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/arch/x86/Kconfig~x86-fs-kmsan-disable-config_dcache_word_access +++ a/arch/x86/Kconfig @@ -129,7 +129,9 @@ config X86 select CLKEVT_I8253 select CLOCKSOURCE_VALIDATE_LAST_CYCLE select CLOCKSOURCE_WATCHDOG - select DCACHE_WORD_ACCESS + # Word-size accesses may read uninitialized data past the trailing \0 + # in strings and cause false KMSAN reports. + select DCACHE_WORD_ACCESS if !KMSAN select DYNAMIC_SIGFRAME select EDAC_ATOMIC_SCRUB select EDAC_SUPPORT _ Patches currently in -mm which might be from glider@google.com are