From nobody Thu May 2 14:32:32 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94F7CC4321E for ; Sat, 26 Nov 2022 05:08:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230036AbiKZFIT (ORCPT ); Sat, 26 Nov 2022 00:08:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229523AbiKZFIN (ORCPT ); Sat, 26 Nov 2022 00:08:13 -0500 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 12F491A806 for ; Fri, 25 Nov 2022 21:08:12 -0800 (PST) Received: from pps.filterd (m0246629.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 2AQ4uq8i011137; Sat, 26 Nov 2022 05:07:56 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=corp-2022-7-12; bh=hEdmssi73mdZJZby6VH83OA2wc6mC+NgmIbVOzmV8+8=; b=YRv/MbqsKUL00lc46HNMmHbRZN5nRNTAQSZErCmQ2JKouYF8lTgHw57IJg+gbcbUbFqd j/TK0X5TvVm+D17WWxIbHD5sXRrb0EQDkYT7HLk+f4wMyOHpW0UMMKIdc+AGmnF94kXY pCo1Pr5LKwMXHqCEwUM9EthDW3yd7Sh7MsHRsSjOzX0BKlDzISo74jDFDZc4mTCMHiVu znFxsXqHM9Q5kTfP4XJqoiVdVTZuyKDNB8v2tUI5u2agBmzDcSSQLsld1MHGaIemOh1K g3xsbZodojcNStcjzFzSsRZLSw67l4LmbjP2+Cwy4O0qqFAahDmoBZ7vboDmM0cvvmc9 nw== Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.appoci.oracle.com [147.154.18.20]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3m3c7dg07b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 26 Nov 2022 05:07:56 +0000 Received: from pps.filterd (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (8.17.1.5/8.17.1.5) with ESMTP id 2AQ4jExv023572; Sat, 26 Nov 2022 05:07:54 GMT Received: from pps.reinject (localhost [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 3m3c1q8p74-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 26 Nov 2022 05:07:54 +0000 Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 2AQ52vF1011626; Sat, 26 Nov 2022 05:07:54 GMT Received: from ca-dev112.us.oracle.com (ca-dev112.us.oracle.com [10.129.136.47]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 3m3c1q8p61-1; Sat, 26 Nov 2022 05:07:54 +0000 From: Harshit Mogalapalli Cc: harshit.m.mogalapalli@oracle.com, error27@gmail.com, harshit.m.mogalapalli@gmail.com, Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Paul Durrant , Boris Ostrovsky , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Subject: [PATCH] xen/privcmd: Fix a possible warning in privcmd_ioctl_mmap_resource() Date: Fri, 25 Nov 2022 21:07:45 -0800 Message-Id: <20221126050745.778967-1-harshit.m.mogalapalli@oracle.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-26_04,2022-11-25_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 suspectscore=0 bulkscore=0 adultscore=0 mlxlogscore=999 malwarescore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211260040 X-Proofpoint-GUID: kO7OwKz7A5zcOQYmakxJLrTnzyx51z-5 X-Proofpoint-ORIG-GUID: kO7OwKz7A5zcOQYmakxJLrTnzyx51z-5 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" As 'kdata.num' is user-controlled data, if user tries to allocate memory larger than(>=3D) MAX_ORDER, then kcalloc() will fail, it creates a stack trace and messes up dmesg with a warning. Call trace: -> privcmd_ioctl --> privcmd_ioctl_mmap_resource Add __GFP_NOWARN in order to avoid too large allocation warning. This is detected by static analysis using smatch. Fixes: 3ad0876554ca ("xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE") Signed-off-by: Harshit Mogalapalli Reviewed-by: Juergen Gross --- drivers/xen/privcmd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c index fae50a24630b..1edf45ee9890 100644 --- a/drivers/xen/privcmd.c +++ b/drivers/xen/privcmd.c @@ -760,7 +760,7 @@ static long privcmd_ioctl_mmap_resource(struct file *fi= le, goto out; } =20 - pfns =3D kcalloc(kdata.num, sizeof(*pfns), GFP_KERNEL); + pfns =3D kcalloc(kdata.num, sizeof(*pfns), GFP_KERNEL | __GFP_NOWARN); if (!pfns) { rc =3D -ENOMEM; goto out; --=20 2.38.1