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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 75AB4C433DF for ; Fri, 10 Jul 2020 08:55:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 54AFF207DF for ; Fri, 10 Jul 2020 08:55:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="IQmJrncp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726850AbgGJIzl (ORCPT ); Fri, 10 Jul 2020 04:55:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48618 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726664AbgGJIzl (ORCPT ); Fri, 10 Jul 2020 04:55:41 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0036FC08C5CE; Fri, 10 Jul 2020 01:55:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=yEGHpJitABwnNlPlNCOVM1pFAgUoybFqtClPk1oj300=; b=IQmJrncprtSUcNlwxmRfiThQ1R GzdUSE6CiA1pt839GyDhc4lzBtxXug+wlbKxXgkAtW8I2ChexF2QaJvLqBppttZYPug48iRN11AO8 w7UHwRLcdvzwzgN5q21R/CuTXtcRRqkC1Xkk/4uUxrgtNkkNefCwNc0OBWdHTGfxYQCbJ2XevR3dd erK7nWsFsiO9t3B6+TH+kmT/6MwtKjsQG42GhmYXLmn2DzOir5EDPyxrn2QTWAyoIX4+7L2mdxkN0 wUw600qBK3cHvTeMpK/3PeXyWkod5w1mrDXWNNjD9PFK9QO/cOPZXuIs98aTJHAlrWU04HsXDfRsI RSove4Lw==; Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jtool-0007xj-4X; Fri, 10 Jul 2020 08:55:39 +0000 Date: Fri, 10 Jul 2020 09:55:39 +0100 From: Christoph Hellwig To: syzbot Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Subject: Re: WARNING in __kernel_write Message-ID: <20200710085539.GA28444@infradead.org> References: <0000000000005f350105aa0af108@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000005f350105aa0af108@google.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Thu, Jul 09, 2020 at 04:54:19PM -0700, syzbot wrote: > Hello, > > syzbot found the following crash on: 9p fails to validate the fds passed in, triggering the new WARN_ON_ONCE added in __kernel_write. Mostly harmless as only the warning is new, but I'll send a patch to better validate the fds at mount time.