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[23.128.96.35]) by mx.google.com with ESMTPS id e3-20020a656883000000b005c62a23ddffsi1585037pgt.778.2023.12.08.06.19.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Dec 2023 06:19:03 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.35 as permitted sender) client-ip=23.128.96.35; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b=sosVTcFy; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.35 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by groat.vger.email (Postfix) with ESMTP id AA7D7802AA3C; Fri, 8 Dec 2023 06:19:00 -0800 (PST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.11 at groat.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1573925AbjLHOSs (ORCPT + 99 others); Fri, 8 Dec 2023 09:18:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1573881AbjLHOSr (ORCPT ); Fri, 8 Dec 2023 09:18:47 -0500 Received: from mail-qk1-x735.google.com (mail-qk1-x735.google.com [IPv6:2607:f8b0:4864:20::735]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2822171E for ; Fri, 8 Dec 2023 06:18:53 -0800 (PST) Received: by mail-qk1-x735.google.com with SMTP id af79cd13be357-77f3159d822so88937285a.2 for ; Fri, 08 Dec 2023 06:18:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1702045133; x=1702649933; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=b4aUU7dNjS/w6j2yOU1hBuNM/NL6fqAI1SOBM3IICMA=; b=sosVTcFyu2GzDo3ZpJ9JYMr9x8cL+nfMjaYe5l6NX8B6UjAvCK8scD//SXdLHsQqws 8jver1uwXhTGs3Brw/1qWLHLetD5hgsBf5HaZTlga6jQWFov3IlLaBKBU+g/++aPAvka IkhhPdieQJvvQduKvns0CaQ6/T1tVGY7TVWPzKdgWurcQ+bqI3XAVicUoqyyXYeES7Yr sy7h2SbV5iGg5IC/090vF8bmTMkF1ByDo0Qhtgg3TcDBqOqm7apNDxsla22HOA4c7fl0 W03DqmLDlqNMuXrHeiy14+TMGkKSbv9dfog+IzqfpOO/JlXiLVEPPaxhI94SW8xe9ml5 lB2Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702045133; x=1702649933; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=b4aUU7dNjS/w6j2yOU1hBuNM/NL6fqAI1SOBM3IICMA=; b=BbLeXupdYNpGq+VEbl60Rt3oK3nXJApKNTdAwMNfMFnbYV59duqE3KFoCCvZplo2tP 7A70HU1j4d148ib8psgLC8eNxb2Y/JPMUgdixh9BqlioScypudLaTXsyPFj73ss1FVmu xw4bpizis8Zrr8i700aIgGLVHuQW/oFmIkeVEao+9V0CjlYeQyRbsTy1PYnKdImMB+E/ w1LPSbdG5vjYB1GvztqvB8VvXziNtOfTR5/35aZ+24Y+4wHgq6Ufi0TychIFkGs2lKIM oR26Bgj8VvT2fN+NrstLq8RauWPz2j0n6Kn9J3CgtVQezHVUqGSsFHmCgzJjq1jENXFq 7AmA== X-Gm-Message-State: AOJu0YxS+ZAXO7Z1MUBZWj5yFo+Tx2riA0blw9+hyVTiY5VVF3C1Jt8t h+u1T5hY6r2EP2+sku/oJkdMLNgNIMhoBHrYtETPUQ== X-Received: by 2002:a05:6214:1023:b0:67a:be9a:e9df with SMTP id k3-20020a056214102300b0067abe9ae9dfmr23702qvr.17.1702045132939; Fri, 08 Dec 2023 06:18:52 -0800 (PST) MIME-Version: 1.0 References: <20231121220155.1217090-1-iii@linux.ibm.com> <20231121220155.1217090-27-iii@linux.ibm.com> In-Reply-To: <20231121220155.1217090-27-iii@linux.ibm.com> From: Alexander Potapenko Date: Fri, 8 Dec 2023 15:18:16 +0100 Message-ID: Subject: Re: [PATCH v2 26/33] s390/ftrace: Unpoison ftrace_regs in kprobe_ftrace_handler() To: Ilya Leoshkevich Cc: Alexander Gordeev , Andrew Morton , Christoph Lameter , David Rientjes , Heiko Carstens , Joonsoo Kim , Marco Elver , Masami Hiramatsu , Pekka Enberg , Steven Rostedt , Vasily Gorbik , Vlastimil Babka , Christian Borntraeger , Dmitry Vyukov , Hyeonggon Yoo <42.hyeyoo@gmail.com>, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Mark Rutland , Roman Gushchin , Sven Schnelle Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE, USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Fri, 08 Dec 2023 06:19:00 -0800 (PST) On Tue, Nov 21, 2023 at 11:02=E2=80=AFPM Ilya Leoshkevich wrote: > > s390 uses assembly code to initialize ftrace_regs and call > kprobe_ftrace_handler(). Therefore, from the KMSAN's point of view, > ftrace_regs is poisoned on kprobe_ftrace_handler() entry. This causes > KMSAN warnings when running the ftrace testsuite. > > Fix by trusting the assembly code and always unpoisoning ftrace_regs in > kprobe_ftrace_handler(). > > Signed-off-by: Ilya Leoshkevich Reviewed-by: Alexander Potapenko