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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 A80C8C43381 for ; Wed, 27 Mar 2019 23:46:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 71A8B20651 for ; Wed, 27 Mar 2019 23:46:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387610AbfC0XqB (ORCPT ); Wed, 27 Mar 2019 19:46:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53912 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730692AbfC0Xp7 (ORCPT ); Wed, 27 Mar 2019 19:45:59 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E4DA8309267B; Wed, 27 Mar 2019 23:45:58 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-121-98.rdu2.redhat.com [10.10.121.98]) by smtp.corp.redhat.com (Postfix) with ESMTP id 20D775D9C4; Wed, 27 Mar 2019 23:45:57 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 43/68] vfs: Make fs_parse() handle fs_param_is_fd-type params better From: David Howells To: viro@zeniv.linux.org.uk Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, dhowells@redhat.com Date: Wed, 27 Mar 2019 23:45:57 +0000 Message-ID: <155373035738.7602.9290664953121039047.stgit@warthog.procyon.org.uk> In-Reply-To: <155372999953.7602.13784796495137723805.stgit@warthog.procyon.org.uk> References: <155372999953.7602.13784796495137723805.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Wed, 27 Mar 2019 23:45:58 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Make fs_parse() handle fs_param_is_fd-type parameters that are passed a string by converting it to an integer (in addition to handling direct fd specification). Also range check the integer. Signed-off-by: David Howells --- fs/fs_parser.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/fs/fs_parser.c b/fs/fs_parser.c index be86703ec371..bd59e1725c50 100644 --- a/fs/fs_parser.c +++ b/fs/fs_parser.c @@ -208,9 +208,20 @@ int fs_parse(struct fs_context *fc, goto okay; case fs_param_is_fd: { - if (param->type != fs_value_is_file) + switch (param->type) { + case fs_value_is_string: + ret = kstrtouint(param->string, 0, &result->uint_32); + break; + case fs_value_is_file: + result->uint_32 = param->dirfd; + ret = 0; + default: goto bad_value; - goto okay; + } + + if (result->uint_32 > INT_MAX) + goto bad_value; + goto maybe_okay; } case fs_param_is_blockdev: