From patchwork Tue Nov 21 22:01:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 13463652 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="R7uyF5QN" Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A98610EC; Tue, 21 Nov 2023 14:03:00 -0800 (PST) Received: from pps.filterd (m0360083.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3ALLv9hG004965; Tue, 21 Nov 2023 22:02:43 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=FBHiR0R3HqDameObtBi5tDwt9B6xgR+xiaoV3r5rhIA=; b=R7uyF5QNom6pN6IBd3nildZSrtcZliHChhJ/GeIJvUNF+EipxafiIvS97SB8gwPwhdi7 wfnA8CtypmGthqq3L4NW+88Q0PBQJ1mSVw32lPxW57ZZMBbP3zvKmuAtrOO7+5xn/a4D iLWQRKyodtiCZVlMfIRIUjy/YfQgvps/nI80Hl1LKR81OLAVhccTQCKdWdTudtf2y1AH vchLVJfuB9tEyQLgC/9nOPrdId99eWWSwwnqyvg2mkZ2bSDCei0H1jFDCgTm/3W0poQq 6Ntf+KEnufdnj23SLQqIe85hUUrUaPw1XGde+Jm3PnGl4gaZ0cNYvPHhrVUF90ZPX9Wb 1A== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3uh4wn85ar-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Nov 2023 22:02:42 +0000 Received: from m0360083.ppops.net (m0360083.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3ALLwvpK009496; Tue, 21 Nov 2023 22:02:41 GMT Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3uh4wn85aa-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Nov 2023 22:02:41 +0000 Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 3ALLnWGn004713; Tue, 21 Nov 2023 22:02:40 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 3uf7yykvj4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Nov 2023 22:02:40 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 3ALM2bBa15597856 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 21 Nov 2023 22:02:37 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 31E082005A; Tue, 21 Nov 2023 22:02:37 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BA2DB20063; Tue, 21 Nov 2023 22:02:35 +0000 (GMT) Received: from heavy.boeblingen.de.ibm.com (unknown [9.179.23.98]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 21 Nov 2023 22:02:35 +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 v2 18/33] lib/string: Add KMSAN support to strlcpy() and strlcat() Date: Tue, 21 Nov 2023 23:01:12 +0100 Message-ID: <20231121220155.1217090-19-iii@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231121220155.1217090-1-iii@linux.ibm.com> References: <20231121220155.1217090-1-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: b6FO-wjNpOLbu-pXCF5KwWPZydmy0FRF X-Proofpoint-ORIG-GUID: BYbwoAtxv4M2QJEIoKEhTF2ta84U2GAL 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=2023-11-21_12,2023-11-21_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 adultscore=0 malwarescore=0 impostorscore=0 mlxscore=0 bulkscore=0 phishscore=0 clxscore=1015 spamscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311210172 Currently KMSAN does not fully propagate metadata in strlcpy() and strlcat(), because they are built with -ffreestanding and call memcpy(). In this combination memcpy() calls are not instrumented. Fix by copying the metadata manually. Add the __STDC_HOSTED__ #ifdef in case the code is compiled with different flags in the future. Signed-off-by: Ilya Leoshkevich --- lib/string.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/lib/string.c b/lib/string.c index be26623953d2..e83c6dd77ec6 100644 --- a/lib/string.c +++ b/lib/string.c @@ -111,6 +111,9 @@ size_t strlcpy(char *dest, const char *src, size_t size) if (size) { size_t len = (ret >= size) ? size - 1 : ret; __builtin_memcpy(dest, src, len); +#if __STDC_HOSTED__ == 0 + kmsan_memmove_metadata(dest, src, len); +#endif dest[len] = '\0'; } return ret; @@ -261,6 +264,9 @@ size_t strlcat(char *dest, const char *src, size_t count) if (len >= count) len = count-1; __builtin_memcpy(dest, src, len); +#if __STDC_HOSTED__ == 0 + kmsan_memmove_metadata(dest, src, len); +#endif dest[len] = 0; return res; }