From mboxrd@z Thu Jan 1 00:00:00 1970 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 36B30C433EF for ; Fri, 8 Jul 2022 18:19:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238280AbiGHSS7 (ORCPT ); Fri, 8 Jul 2022 14:18:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239135AbiGHSSx (ORCPT ); Fri, 8 Jul 2022 14:18:53 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8425E82396 for ; Fri, 8 Jul 2022 11:18:52 -0700 (PDT) Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 268HAXR2025070 for ; Fri, 8 Jul 2022 11:18:52 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=KdCc4KrhWrRWer2ak8qf+eJb+HmLvN8qCo6zNNUoH/s=; b=PaBj+fHoL5kPN6aqLxjEyyVH6JKD5uuvBFEG8G0Eb64IXVmaGWmveDWDPClMVoYIQ+CU 6kRdDfeyMRflKiS4vAx8wgLyWZ5bEa9+PNL5wppKbfZfEz/FQcmuQruZMB5/8ioTTfdb WgFo4qtLeQS0kph9wvMre0BCKnzwDVTVGow= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3h5y1dj772-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 08 Jul 2022 11:18:52 -0700 Received: from twshared14577.08.ash8.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:21d::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Fri, 8 Jul 2022 11:18:50 -0700 Received: by devbig038.lla2.facebook.com (Postfix, from userid 572232) id AEF432B9EC23; Fri, 8 Jul 2022 11:18:41 -0700 (PDT) From: Dylan Yudaken To: Jens Axboe , Pavel Begunkov , CC: , Dylan Yudaken Subject: [PATCH for-next 2/4] io_uring: support 0 length iov in buffer select in compat Date: Fri, 8 Jul 2022 11:18:36 -0700 Message-ID: <20220708181838.1495428-3-dylany@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220708181838.1495428-1-dylany@fb.com> References: <20220708181838.1495428-1-dylany@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-GUID: IjgDvSYdn3QhhUGBnWGV6EG6oiYWB4bZ X-Proofpoint-ORIG-GUID: IjgDvSYdn3QhhUGBnWGV6EG6oiYWB4bZ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-08_15,2022-07-08_01,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Match up work done in "io_uring: allow iov_len =3D 0 for recvmsg and buff= er select", but for compat code path. Fixes: a68caad69ce5 ("io_uring: allow iov_len =3D 0 for recvmsg and buffe= r select") Signed-off-by: Dylan Yudaken --- io_uring/net.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/io_uring/net.c b/io_uring/net.c index 188edbed1eb7..997c17512694 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -384,16 +384,21 @@ static int __io_compat_recvmsg_copy_hdr(struct io_k= iocb *req, if (req->flags & REQ_F_BUFFER_SELECT) { compat_ssize_t clen; =20 - if (len > 1) - return -EINVAL; - if (!access_ok(uiov, sizeof(*uiov))) - return -EFAULT; - if (__get_user(clen, &uiov->iov_len)) - return -EFAULT; - if (clen < 0) + if (len =3D=3D 0) { + sr->len =3D 0; + iomsg->free_iov =3D NULL; + } else if (len > 1) { return -EINVAL; - sr->len =3D clen; - iomsg->free_iov =3D NULL; + } else { + if (!access_ok(uiov, sizeof(*uiov))) + return -EFAULT; + if (__get_user(clen, &uiov->iov_len)) + return -EFAULT; + if (clen < 0) + return -EINVAL; + sr->len =3D clen; + iomsg->free_iov =3D NULL; + } } else { iomsg->free_iov =3D iomsg->fast_iov; ret =3D __import_iovec(READ, (struct iovec __user *)uiov, len, --=20 2.30.2