From patchwork Wed Jun 19 15:43:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 13704173 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CA43915B113; Wed, 19 Jun 2024 15:46:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718811977; cv=none; b=h6+dlZvEhbQB8WHho9uWn9R0aAFmmf307O7I2TVYIGVR7zUG9rw7Exj+5wIw/iV6kYI2STf9tuJp9RAvYxNrAX3MrXmtbJiXsiJPZpoPBinqN6Zaj0bZhTCeyoxom0foUR9ROkt7aX/ln+cyUPA2Ab5tg5D/VpGjth4BipHGPLw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718811977; c=relaxed/simple; bh=2AnIE70QzFI9Kip6Mfw+IW/wGTmCD71UA80HEeQ1q/0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pgvFE3f2mP6hX2SkGAc4HDERFKB/EhSi8GWoDgDGdqXOtJEiUJYr9/Bz+RTNGCU6xTf37u/LW4qVAr6KTR9nZ5p6GuSggbb7Vn2HS22Bs7AyhJImvb/oPxsPsDrJsKbxRbnZLb95PxZ8m+G7aDPvlATfnjyXcUS4j4LCy1X9c1w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=Jz9/nrAf; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="Jz9/nrAf" Received: from pps.filterd (m0353726.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45JEx3tN025123; Wed, 19 Jun 2024 15:45:44 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=pp1; bh=9fryXD6fg7ZWH /K5Ic2hWhXvK+X7HFTa6K6lMBwUrkw=; b=Jz9/nrAfw5GxXgB9U28v+ByWDITrv jhILAGv/6P2p6IxogTckXJehDWif1xT6jfQPNYWHDcKpk0UzLhKAkowuo87OWc90 oucUHKgFDNa5XK/ri42eyEDOCz7Ce0mD/TqoPJpe5yidvTrPm6IHYbDRzea06CX/ gIGhB3aZtucbMqBLjYxCNP/potSh7v5YT7XYdeyg57hsqB56P54xdNGcs7hf7hHu CRKBvp3so5nkvQ9nTvEvGkpXZniIYi9v1aJ2bCuRwOt/nPKFXGB6Gzc7zKhUq7Ks DqUQo6l4JlhiF1QUiC/YNM3Nsh8dkl6T9NUxSlvXEl3JzGl931icCa0cw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3yv1jfr5bb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 19 Jun 2024 15:45:44 +0000 (GMT) Received: from m0353726.ppops.net (m0353726.ppops.net [127.0.0.1]) by pps.reinject (8.18.0.8/8.18.0.8) with ESMTP id 45JFjhGo005735; Wed, 19 Jun 2024 15:45:43 GMT Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3yv1jfr5b5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 19 Jun 2024 15:45:43 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 45JErhcX013488; Wed, 19 Jun 2024 15:45:42 GMT Received: from smtprelay04.fra02v.mail.ibm.com ([9.218.2.228]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 3ysr03wkqd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 19 Jun 2024 15:45:42 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay04.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 45JFjbpM18415998 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 19 Jun 2024 15:45:39 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F27852006A; Wed, 19 Jun 2024 15:45:36 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A33472004B; Wed, 19 Jun 2024 15:45:36 +0000 (GMT) Received: from black.boeblingen.de.ibm.com (unknown [9.155.200.166]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 19 Jun 2024 15:45:36 +0000 (GMT) From: Ilya Leoshkevich To: Alexander Gordeev , Alexander Potapenko , Andrew Morton , Christoph Lameter , David Rientjes , Heiko Carstens , Joonsoo Kim , Marco Elver , Masami Hiramatsu , Pekka Enberg , Steven Rostedt , Vasily Gorbik , Vlastimil Babka Cc: 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 , Ilya Leoshkevich Subject: [PATCH v5 09/37] kmsan: Expose kmsan_get_metadata() Date: Wed, 19 Jun 2024 17:43:44 +0200 Message-ID: <20240619154530.163232-10-iii@linux.ibm.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240619154530.163232-1-iii@linux.ibm.com> References: <20240619154530.163232-1-iii@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 0jGG39Dru2q_AB0R1nHJ-WBhtrcxjIZW X-Proofpoint-ORIG-GUID: eeWd6pnR11NC5-RtTJGUnFqboFK1-_M5 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-19_02,2024-06-19_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxscore=0 lowpriorityscore=0 phishscore=0 clxscore=1015 bulkscore=0 malwarescore=0 mlxlogscore=884 suspectscore=0 priorityscore=1501 spamscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406190115 Each s390 CPU has lowcore pages associated with it. Each CPU sees its own lowcore at virtual address 0 through a hardware mechanism called prefixing. Additionally, all lowcores are mapped to non-0 virtual addresses stored in the lowcore_ptr[] array. When lowcore is accessed through virtual address 0, one needs to resolve metadata for lowcore_ptr[raw_smp_processor_id()]. Expose kmsan_get_metadata() to make it possible to do this from the arch code. Reviewed-by: Alexander Potapenko Signed-off-by: Ilya Leoshkevich --- include/linux/kmsan.h | 9 +++++++++ mm/kmsan/instrumentation.c | 1 + mm/kmsan/kmsan.h | 1 - 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/include/linux/kmsan.h b/include/linux/kmsan.h index e0c23a32cdf0..fe6c2212bdb1 100644 --- a/include/linux/kmsan.h +++ b/include/linux/kmsan.h @@ -230,6 +230,15 @@ void kmsan_handle_urb(const struct urb *urb, bool is_out); */ void kmsan_unpoison_entry_regs(const struct pt_regs *regs); +/** + * kmsan_get_metadata() - Return a pointer to KMSAN shadow or origins. + * @addr: kernel address. + * @is_origin: whether to return origins or shadow. + * + * Return NULL if metadata cannot be found. + */ +void *kmsan_get_metadata(void *addr, bool is_origin); + #else static inline void kmsan_init_shadow(void) diff --git a/mm/kmsan/instrumentation.c b/mm/kmsan/instrumentation.c index 8a1bbbc723ab..94b49fac9d8b 100644 --- a/mm/kmsan/instrumentation.c +++ b/mm/kmsan/instrumentation.c @@ -14,6 +14,7 @@ #include "kmsan.h" #include +#include #include #include #include diff --git a/mm/kmsan/kmsan.h b/mm/kmsan/kmsan.h index adf443bcffe8..34b83c301d57 100644 --- a/mm/kmsan/kmsan.h +++ b/mm/kmsan/kmsan.h @@ -66,7 +66,6 @@ struct shadow_origin_ptr { struct shadow_origin_ptr kmsan_get_shadow_origin_ptr(void *addr, u64 size, bool store); -void *kmsan_get_metadata(void *addr, bool is_origin); void __init kmsan_init_alloc_meta_for_range(void *start, void *end); enum kmsan_bug_reason {