From patchwork Wed Dec 13 23:24:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 13492097 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="SK/uPMUO" Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5F546F2; Wed, 13 Dec 2023 15:37:11 -0800 (PST) Received: from pps.filterd (m0353723.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3BDMS9Re010981; Wed, 13 Dec 2023 23:36:58 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=pkyPvKTJArMXixW9BBHqQwuAqKxQXhtM/cFCkvVkAvs=; b=SK/uPMUOBxDCqwLjI+zPe72ZBLUqtLm5t64qr6gnkMEr7sgAhoqQD7Kx0sFoOM5Yr+Vf BatoxxRSXvOrAcL1zQlOXp/M4uFcip+aL+08KVvFKLs3QPtKXQk2moXsrgzTgYxlidLI Fx+2n35ZO/EkLc5BeQHwbBZzQbPStieopJmsgp8mu4UP0marh1+q2Ed3MvPW6XKBsxmm fT/DF3058jjxQkA2YtcYEfnDNCi6hVzDnZrVq2XvjCeyZsz2ENjOPfBbBsH3b1L5J8p4 vwJ6kYDF6f/KbXgS19IdigifjlvDGuW1MoFSB5Ev7JvunapHF1eAzfatOWeIev14DKd6 5w== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3uyne6164t-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 13 Dec 2023 23:36:58 +0000 Received: from m0353723.ppops.net (m0353723.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3BDN8eeg015721; Wed, 13 Dec 2023 23:36:57 GMT Received: from ppma12.dal12v.mail.ibm.com (dc.9e.1632.ip4.static.sl-reverse.com [50.22.158.220]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3uyne615y8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 13 Dec 2023 23:36:57 +0000 Received: from pps.filterd (ppma12.dal12v.mail.ibm.com [127.0.0.1]) by ppma12.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 3BDL68jb008491; Wed, 13 Dec 2023 23:36:26 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma12.dal12v.mail.ibm.com (PPS) with ESMTPS id 3uw2jtmvkc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 13 Dec 2023 23:36:26 +0000 Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 3BDNaNFW15205024 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 13 Dec 2023 23:36:24 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D510F2004B; Wed, 13 Dec 2023 23:36:23 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6C93B20040; Wed, 13 Dec 2023 23:36:22 +0000 (GMT) Received: from heavy.boeblingen.de.ibm.com (unknown [9.171.70.156]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 13 Dec 2023 23:36:22 +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 v3 09/34] kmsan: Expose kmsan_get_metadata() Date: Thu, 14 Dec 2023 00:24:29 +0100 Message-ID: <20231213233605.661251-10-iii@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231213233605.661251-1-iii@linux.ibm.com> References: <20231213233605.661251-1-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: 7vjTxdvAtbwBGE_g6qvKOeyD3SR7M5Qx X-Proofpoint-ORIG-GUID: 3_WNaL8739bQutUg911FpVkRk6xoqt1c X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-13_14,2023-12-13_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 clxscore=1015 malwarescore=0 mlxscore=0 spamscore=0 bulkscore=0 mlxlogscore=852 lowpriorityscore=0 suspectscore=0 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312130167 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. 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 {