From patchwork Wed Nov 15 20:30:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 13457315 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="oL5sLjSW" Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7CC14172A; Wed, 15 Nov 2023 12:34:49 -0800 (PST) Received: from pps.filterd (m0360072.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3AFKTjqx023176; Wed, 15 Nov 2023 20:34:29 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=kILyw5cdgjGn5/bq6lT/7Km7hA/yuzYatpUTfjRHTeA=; b=oL5sLjSWmr/gtMhjJL7JzsK4iexVduc7Zh7DY0jvhRMY+K0caQw0xyf3M47BP55000EY DniyVGoEvJA48XvRTWtF2WsEojgnvAQq7zreNwFioenCxYH3w0r+3RFCjK0usz+tgcjf wmK5TSc0nPrYcmZW9zbOB+KU8YNhk+i0Xex4s/Id7HgguMNXCIW0ozL2OC0Lg85/phXi YStPxg7pDpBhWcFf9EQ3+xO7CXnQ8AQjtW6SnwCrP4QhBcMFgBqYTEIVsDNLD9HVSBXb OYSDQx2u2fD0d+xOSqEbzxUwTg2nDOgeSpQNLnckhB4GU3euu/GCkGr5aiIZrjTzGBip Iw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3ud52r846v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 15 Nov 2023 20:34:28 +0000 Received: from m0360072.ppops.net (m0360072.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3AFKTkn4023256; Wed, 15 Nov 2023 20:34:28 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 3ud52r846e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 15 Nov 2023 20:34:27 +0000 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 3AFKJ0V7024857; Wed, 15 Nov 2023 20:34:26 GMT Received: from smtprelay04.fra02v.mail.ibm.com ([9.218.2.228]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 3uapn1sj5e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 15 Nov 2023 20:34:26 +0000 Received: from smtpav01.fra02v.mail.ibm.com (smtpav01.fra02v.mail.ibm.com [10.20.54.100]) by smtprelay04.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 3AFKYOMw40894804 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 15 Nov 2023 20:34:24 GMT Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 039E820043; Wed, 15 Nov 2023 20:34:24 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A8BF620040; Wed, 15 Nov 2023 20:34:22 +0000 (GMT) Received: from heavy.boeblingen.de.ibm.com (unknown [9.179.9.51]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 15 Nov 2023 20:34:22 +0000 (GMT) From: Ilya Leoshkevich To: Alexander Gordeev , Alexander Potapenko , Andrew Morton , Christoph Lameter , David Rientjes , 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 09/32] kmsan: Introduce kmsan_memmove_metadata() Date: Wed, 15 Nov 2023 21:30:41 +0100 Message-ID: <20231115203401.2495875-10-iii@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231115203401.2495875-1-iii@linux.ibm.com> References: <20231115203401.2495875-1-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: _DluWkg_or4n634NGc6XmkFZtcUvSsfY X-Proofpoint-ORIG-GUID: 4Wi2DjioGwv31onDtsbO8JdqEX7Bd4Hn X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-15_20,2023-11-15_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 lowpriorityscore=0 adultscore=0 clxscore=1015 priorityscore=1501 mlxscore=0 phishscore=0 spamscore=0 mlxlogscore=999 suspectscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311150163 It is useful to manually copy metadata in order to describe the effects of memmove()-like logic in uninstrumented code or inline asm. Introduce kmsan_memmove_metadata() for this purpose. Signed-off-by: Ilya Leoshkevich --- include/linux/kmsan-checks.h | 14 ++++++++++++++ mm/kmsan/hooks.c | 11 +++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/linux/kmsan-checks.h b/include/linux/kmsan-checks.h index c4cae333deec..5218973f0ad0 100644 --- a/include/linux/kmsan-checks.h +++ b/include/linux/kmsan-checks.h @@ -61,6 +61,17 @@ void kmsan_check_memory(const void *address, size_t size); void kmsan_copy_to_user(void __user *to, const void *from, size_t to_copy, size_t left); +/** + * kmsan_memmove_metadata() - Copy kernel memory range metadata. + * @dst: start of the destination kernel memory range. + * @src: start of the source kernel memory range. + * @n: size of the memory ranges. + * + * KMSAN will treat the destination range as if its contents were memmove()d + * from the source range. + */ +void kmsan_memmove_metadata(void *dst, const void *src, size_t n); + #else static inline void kmsan_poison_memory(const void *address, size_t size, @@ -77,6 +88,9 @@ static inline void kmsan_copy_to_user(void __user *to, const void *from, size_t to_copy, size_t left) { } +static inline void kmsan_memmove_metadata(void *dst, const void *src, size_t n) +{ +} #endif diff --git a/mm/kmsan/hooks.c b/mm/kmsan/hooks.c index eafc45f937eb..4d477a0a356c 100644 --- a/mm/kmsan/hooks.c +++ b/mm/kmsan/hooks.c @@ -286,6 +286,17 @@ void kmsan_copy_to_user(void __user *to, const void *from, size_t to_copy, } EXPORT_SYMBOL(kmsan_copy_to_user); +void kmsan_memmove_metadata(void *dst, const void *src, size_t n) +{ + if (!kmsan_enabled || kmsan_in_runtime()) + return; + + kmsan_enter_runtime(); + kmsan_internal_memmove_metadata(dst, (void *)src, n); + kmsan_leave_runtime(); +} +EXPORT_SYMBOL(kmsan_memmove_metadata); + /* Helper function to check an URB. */ void kmsan_handle_urb(const struct urb *urb, bool is_out) {