From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f69.google.com (mail-pg0-f69.google.com [74.125.83.69]) by kanga.kvack.org (Postfix) with ESMTP id 95BD46B0312 for ; Wed, 7 Feb 2018 08:55:45 -0500 (EST) Received: by mail-pg0-f69.google.com with SMTP id b7so344737pga.12 for ; Wed, 07 Feb 2018 05:55:45 -0800 (PST) Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id 44-v6sor532157pla.70.2018.02.07.05.55.44 for (Google Transport Security); Wed, 07 Feb 2018 05:55:44 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <94eb2c0efc1ede1c4205648e8a49@google.com> From: Dmitry Vyukov Date: Wed, 7 Feb 2018 14:55:23 +0100 Message-ID: Subject: Re: WARNING: bad usercopy in put_cmsg Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-mm@kvack.org List-ID: To: Kees Cook Cc: syzbot , keun-o.park@darkmatter.ae, Laura Abbott , LKML , Linux-MM , Mark Rutland , Ingo Molnar , syzkaller-bugs@googlegroups.com On Tue, Feb 6, 2018 at 8:16 PM, Kees Cook wrote: > On Wed, Feb 7, 2018 at 4:33 AM, Dmitry Vyukov wrote: >> On Tue, Feb 6, 2018 at 6:31 PM, syzbot >> wrote: >>> Hello, >>> >>> syzbot hit the following crash on upstream commit >>> e237f98a9c134c3d600353f21e07db915516875b (Mon Feb 5 21:35:56 2018 +0000) >>> Merge tag 'xfs-4.16-merge-5' of >>> git://git.kernel.org/pub/scm/fs/xfs/xfs-linux >>> >>> So far this crash happened 8 times on net-next, upstream. >>> C reproducer is attached. >>> syzkaller reproducer is attached. >>> Raw console output is attached. >>> compiler: gcc (GCC) 7.1.1 20170620 >>> .config is attached. >> >> #syz dup: WARNING in usercopy_warn >> >> Let's make that one the main copy, since Kees is already looking at it. > > This one has a more descriptive subject, can we dup towards this one? > Whatever the case, yup, still working on it. Humm, I see that there is currently no way to just "undup" a bug. It's possible to remark it as invalid, or fix with commits, but not possible to just undup and get into "open" state. I've filed https://github.com/google/syzkaller/issues/520 for this. Meanwhile, please add either Reported-by: tag from the other bug, or from both. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org