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 X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01FA0C2D0DB for ; Thu, 23 Jan 2020 19:47:46 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C58EA21D7E for ; Thu, 23 Jan 2020 19:47:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="R1LC4xue" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C58EA21D7E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60541 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuiS8-0006pF-R9 for qemu-devel@archiver.kernel.org; Thu, 23 Jan 2020 14:47:44 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41288) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iufdw-0004xQ-9M for qemu-devel@nongnu.org; Thu, 23 Jan 2020 11:47:45 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iufdv-0006XI-4p for qemu-devel@nongnu.org; Thu, 23 Jan 2020 11:47:44 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:34611 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iufdv-0006XA-1s for qemu-devel@nongnu.org; Thu, 23 Jan 2020 11:47:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579798062; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IEGaL9aFkkAtsNAhoj+NL8XMOR+mvE9/kShd09JYqiA=; b=R1LC4xueevTdqV7XT9FaevasYkFWNlERKexK1LdWtQc7KgdbNYygZ60kT/Sb7gkvClPPAg 4n/3wgZpMReTtCTPgvJATdTFO6jLYOkmmrd39kxMDtSN6Wprb8/oXbMf44kPB5LXMfPkdm S/rL2q7qwiZxTPURMZj9M7xyq7VrT1I= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-213-LYmlmJwuMTWRgHAuX5xDFA-1; Thu, 23 Jan 2020 11:47:41 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 736C7107ACCA for ; Thu, 23 Jan 2020 16:47:40 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-116-110.ams2.redhat.com [10.36.116.110]) by smtp.corp.redhat.com (Postfix) with ESMTP id C073228998; Thu, 23 Jan 2020 16:47:39 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com Subject: [PULL 043/108] virtiofsd: add fuse_mbuf_iter API Date: Thu, 23 Jan 2020 16:45:25 +0000 Message-Id: <20200123164630.91498-44-dgilbert@redhat.com> In-Reply-To: <20200123164630.91498-1-dgilbert@redhat.com> References: <20200123164630.91498-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: LYmlmJwuMTWRgHAuX5xDFA-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Stefan Hajnoczi Introduce an API for consuming bytes from a buffer with size checks. All FUSE operations will be converted to use this safe API instead of void *inarg. Signed-off-by: Stefan Hajnoczi Signed-off-by: Dr. David Alan Gilbert --- tools/virtiofsd/buffer.c | 28 ++++++++++++++++++++ tools/virtiofsd/fuse_common.h | 49 ++++++++++++++++++++++++++++++++++- 2 files changed, 76 insertions(+), 1 deletion(-) diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c index 772efa922d..42a608f6bd 100644 --- a/tools/virtiofsd/buffer.c +++ b/tools/virtiofsd/buffer.c @@ -267,3 +267,31 @@ ssize_t fuse_buf_copy(struct fuse_bufvec *dstv, struct= fuse_bufvec *srcv) =20 return copied; } + +void *fuse_mbuf_iter_advance(struct fuse_mbuf_iter *iter, size_t len) +{ + void *ptr; + + if (len > iter->size - iter->pos) { + return NULL; + } + + ptr =3D iter->mem + iter->pos; + iter->pos +=3D len; + return ptr; +} + +const char *fuse_mbuf_iter_advance_str(struct fuse_mbuf_iter *iter) +{ + const char *str =3D iter->mem + iter->pos; + size_t remaining =3D iter->size - iter->pos; + size_t i; + + for (i =3D 0; i < remaining; i++) { + if (str[i] =3D=3D '\0') { + iter->pos +=3D i + 1; + return str; + } + } + return NULL; +} diff --git a/tools/virtiofsd/fuse_common.h b/tools/virtiofsd/fuse_common.h index 0cb33acc2f..f8f6433743 100644 --- a/tools/virtiofsd/fuse_common.h +++ b/tools/virtiofsd/fuse_common.h @@ -703,10 +703,57 @@ size_t fuse_buf_size(const struct fuse_bufvec *bufv); */ ssize_t fuse_buf_copy(struct fuse_bufvec *dst, struct fuse_bufvec *src); =20 +/** + * Memory buffer iterator + * + */ +struct fuse_mbuf_iter { + /** + * Data pointer + */ + void *mem; + + /** + * Total length, in bytes + */ + size_t size; + + /** + * Offset from start of buffer + */ + size_t pos; +}; + +/* Initialize memory buffer iterator from a fuse_buf */ +#define FUSE_MBUF_ITER_INIT(fbuf) \ + ((struct fuse_mbuf_iter){ \ + .mem =3D fbuf->mem, \ + .size =3D fbuf->size, \ + .pos =3D 0, \ + }) + +/** + * Consume bytes from a memory buffer iterator + * + * @param iter memory buffer iterator + * @param len number of bytes to consume + * @return pointer to start of consumed bytes or + * NULL if advancing beyond end of buffer + */ +void *fuse_mbuf_iter_advance(struct fuse_mbuf_iter *iter, size_t len); + +/** + * Consume a NUL-terminated string from a memory buffer iterator + * + * @param iter memory buffer iterator + * @return pointer to the string or + * NULL if advancing beyond end of buffer or there is no NUL-termi= nator + */ +const char *fuse_mbuf_iter_advance_str(struct fuse_mbuf_iter *iter); + /* * Signal handling */ - /** * Exit session on HUP, TERM and INT signals and ignore PIPE signal * --=20 2.24.1