From patchwork Mon May 17 14:03:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 440553 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT 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 3BDE4C433ED for ; Mon, 17 May 2021 15:49:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 20794611BD for ; Mon, 17 May 2021 15:49:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242863AbhEQPvH (ORCPT ); Mon, 17 May 2021 11:51:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:36456 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245511AbhEQPsn (ORCPT ); Mon, 17 May 2021 11:48:43 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 58A8561963; Mon, 17 May 2021 14:45:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621262714; bh=LnGGExNcUTjQB6r41cBkpiSRuxFT6a9BFdRTamgqnu0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jMz7rF7TFV5rUM0cqXr9EYNf/UHcGdU/a+nb4dHVQkX7WTecZjBtKJHiop1QhXeGM 06qiUh7BmRH+9khWUVe5VmMBqS7u2OyhjiDOPcuvX2kMq0BkUkXuES1ym0CI46eBxH a/1hf3ubPkZ2WgEee14JOYpNQUpEq4VQCI6DbS9k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Rafael J. Wysocki" , syzbot+92340f7b2b4789907fdb@syzkaller.appspotmail.com Subject: [PATCH 5.10 276/289] kobject_uevent: remove warning in init_uevent_argv() Date: Mon, 17 May 2021 16:03:21 +0200 Message-Id: <20210517140314.428899107@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140305.140529752@linuxfoundation.org> References: <20210517140305.140529752@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman commit b4104180a2efb85f55e1ba1407885c9421970338 upstream. syzbot can trigger the WARN() in init_uevent_argv() which isn't the nicest as the code does properly recover and handle the error. So change the WARN() call to pr_warn() and provide some more information on what the buffer size that was needed. Link: https://lore.kernel.org/r/20201107082206.GA19079@kroah.com Cc: "Rafael J. Wysocki" Cc: linux-kernel@vger.kernel.org Reported-by: syzbot+92340f7b2b4789907fdb@syzkaller.appspotmail.com Signed-off-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20210405094852.1348499-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman --- lib/kobject_uevent.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/lib/kobject_uevent.c +++ b/lib/kobject_uevent.c @@ -251,12 +251,13 @@ static int kobj_usermode_filter(struct k static int init_uevent_argv(struct kobj_uevent_env *env, const char *subsystem) { + int buffer_size = sizeof(env->buf) - env->buflen; int len; - len = strlcpy(&env->buf[env->buflen], subsystem, - sizeof(env->buf) - env->buflen); - if (len >= (sizeof(env->buf) - env->buflen)) { - WARN(1, KERN_ERR "init_uevent_argv: buffer size too small\n"); + len = strlcpy(&env->buf[env->buflen], subsystem, buffer_size); + if (len >= buffer_size) { + pr_warn("init_uevent_argv: buffer size of %d too small, needed %d\n", + buffer_size, len); return -ENOMEM; }