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=-16.3 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 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 10538C433E0 for ; Tue, 9 Feb 2021 09:52:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C882364E77 for ; Tue, 9 Feb 2021 09:52:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230493AbhBIJv5 (ORCPT ); Tue, 9 Feb 2021 04:51:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:56320 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230483AbhBIJtv (ORCPT ); Tue, 9 Feb 2021 04:49:51 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0012164E77; Tue, 9 Feb 2021 09:49:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1612864150; bh=nEewrMAUeYK4aam0HpuXalNokQ+rdLXp/Q8WccuvwhI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EUudAXejpLYwVGcnxiXdzL2Z3e9LsSxYOH0bdHHzartLohDlznMlhBARv9VIF+vtY 9VRYXcndIyM6lZXQd+7eoO0j3goVesIrBH0FvaMfvRA69aPrfRM7PGMj0yRpyfKk4Q 2xxg/uLGkB4Q2X+QNrEd4KG7by1fgehm9vtLCQ6U= Date: Tue, 9 Feb 2021 10:49:07 +0100 From: Greg KH To: Sabyrzhan Tasbolatov Cc: alex.dewar90@gmail.com, arnd@arndb.de, linux-kernel@vger.kernel.org, syzbot+15ec7391f3d6a1a7cc7d@syzkaller.appspotmail.com Subject: Re: [PATCH v2] drivers/misc/vmw_vmci: restrict too big queue size in Message-ID: References: <20210209093101.2097627-1-snovitoll@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210209093101.2097627-1-snovitoll@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 09, 2021 at 03:31:01PM +0600, Sabyrzhan Tasbolatov wrote: > syzbot found WARNING in qp_broker_alloc[1] in qp_host_alloc_queue() > when num_pages is 0x100001, giving queue_size + queue_page_size > bigger than KMALLOC_MAX_SIZE for kzalloc(), resulting order >= MAX_ORDER > condition. > > queue_size + queue_page_size=0x8000d8, where KMALLOC_MAX_SIZE=0x400000. > > Reported-by: syzbot+15ec7391f3d6a1a7cc7d@syzkaller.appspotmail.com > Signed-off-by: Sabyrzhan Tasbolatov > --- > >As this is controllable by userspace, you just provided a way to flood > >the kernel logs. > > > >Please make this a dev_dbg() call instead, if you really want to see it. > >Otherwise just return NULL, no need to report anything, right? > > Thanks, removed pr_warn(). > > v2: Removed pr_warn() to avoid flood from user-space > --- > drivers/misc/vmw_vmci/vmci_queue_pair.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c > index f6af406fda80..ea16df73cde0 100644 > --- a/drivers/misc/vmw_vmci/vmci_queue_pair.c > +++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c > @@ -538,9 +538,7 @@ static struct vmci_queue *qp_host_alloc_queue(u64 size) > queue_page_size = num_pages * sizeof(*queue->kernel_if->u.h.page); > > if (queue_size + queue_page_size > KMALLOC_MAX_SIZE) { > - pr_warn("too big queue to allocate\n"); > return NULL; > - } > This patch doesn't apply to the tree, you can't send me a patch that is relative to your previous one, that doesn't work at all. And also, test-build your patches always first, to not do so is a bit rude to maintainers... thanks, greg k-h